Surface protective film

Abstract

This invention provides a surface protective film comprising a urethane-based adhesive layer with excellent surface elastic modulus. The surface protective film of an embodiment of this invention comprises a urethane-based adhesive layer formed from a urethane-based adhesive composition, which, typically, comprises a urethane prepolymer, a polyol, and a polyfunctional isocyanate compound, wherein the urethane prepolymer and / or the polyol has structural units represented by the following general formula (1), and the surface elastic modulus of the urethane-based adhesive layer is 0.8 MPa or higher.

Description

Technical Field

[0001] This invention relates to a surface protective film. Prior Technology

[0002] Optical or electronic components are coated with a protective film to prevent surface damage during processing, assembly, inspection, and transportation. This protective film can be peeled off from the optical or electronic components when surface protection is no longer required (Patent Document 1).

[0003] As an adhesive layer in such a surface protective film, adhesive layers containing various adhesives are known. Considering its excellent secondary processing properties, wettability, and transparency, the adhesive layer of the surface protective film adhered to optical or electronic components is preferably a urethane-based adhesive layer containing a urethane-based adhesive.

[0004] However, compared to adhesive layers containing other adhesives, urethane-based adhesive layers tend to have a lower surface elastic modulus. Therefore, the surface protective film sometimes fails to adequately mitigate externally applied stress, thus failing to sufficiently reduce damage to the adherend. Therefore, it is desirable to improve the surface elastic modulus of urethane-based adhesive layers. [Previous Technical Documents] [Patent Literature]

[0005] Patent Document 1: Japanese Patent Application Publication No. 2016-17109 Summary of the Invention

[0006] [The problem the invention aims to solve]

[0007] The objective of this invention is to provide a surface protective film comprising a carbamate-based adhesive layer with excellent surface elastic modulus. [Technical means to solve the problem]

[0008] Surface protective film system of embodiments of the present invention Those containing carbamate-based adhesive layers, The carbamate adhesive layer comprises a carbamate adhesive formed from a carbamate adhesive composition. This carbamate-based adhesive composition (A) comprises a carbamate prepolymer, a polyol, and a polyfunctional isocyanate compound, wherein the carbamate prepolymer and / or the polyol has a structural unit represented by the following general formula (1); or (B) A urethane prepolymer comprising a structural unit having the structural unit shown in general formula (1) below, and a polyfunctional isocyanate compound; or (C) A polyol having a structural unit of the following general formula (1) and a polyfunctional isocyanate compound; The surface elastic modulus of the urethane adhesive layer is above 0.8 MPa. [Chemistry 1] (In general formula (1), R1 represents one of the groups selected from hydrogen atoms, alkyl groups with 1 to 4 carbon atoms, and hydroxyalkyl groups with 1 to 6 carbon atoms. Multiple R1s may be the same or different. n represents an integer from 1 to 4. m is the number of repetitions of the structural unit, representing an integer from 1 to 200)

[0009] In one embodiment, the above-mentioned carbamate prepolymer and / or the above-mentioned polyol have structural units represented by the following general formula (2), and the content ratio of the structural units represented by the above-mentioned general formula (1) in the above-mentioned carbamate adhesive composition is greater than the content ratio of the structural units represented by the following general formula (2). [Chemistry 2] (In general formula (2), R2 represents one of the groups selected from hydrogen atoms and alkyl groups with 1 to 4 carbon atoms. Multiple R2s may be the same or different. p is the number of repetitions of the structural unit, representing an integer from 1 to 300)

[0010] In one embodiment, the above-mentioned carbamate-based adhesive composition comprises an ionic compound. The content of the above-mentioned ionic compound relative to the total of 100 parts by weight of the above-mentioned carbamate prepolymer and the above-mentioned polyol is 0.05 parts by weight or more.

[0011] In one embodiment, the above-mentioned carbamate adhesive composition comprises at least one selected from the group consisting of fluorinated additives and silicone additives, wherein the total amount of the fluorinated additive and the silicone additive is at least 0.01 parts by weight relative to 100 parts by weight of the total carbamate prepolymer and the polyol.

[0012] In one embodiment, after the above-mentioned carbamate adhesive layer is bonded to a glass plate and subjected to 30 minutes at 23°C, the peeling force when peeled from the glass plate at a peeling angle of 180 degrees and a peeling speed of 300 mm / min is 0.5 gf / 25 mm to 2.0 gf / 25 mm.

[0013] In one embodiment, the haze of the above-mentioned carbamate adhesive layer is 3.5% or less.

[0014] In one embodiment, after the above-mentioned carbamate adhesive layer is bonded to a glass plate and subjected to 24 hours at 23°C, and then peeled off from the glass plate at a peel angle of 180 degrees and a peel speed of 0.3 m / min, the residual adhesion rate to the glass plate is more than 80%. [Effects of the Invention]

[0015] According to the present invention, a surface protective film comprising a carbamate-based adhesive layer having an excellent surface elastic modulus can be provided. Simple Explanation of the Diagram

[0016] Figure 1 is a schematic cross-sectional view of the surface protective film according to a preferred embodiment of the present invention. Implementation

[0017] ≪≪1. Surface Protective Film≫≫ The surface protective film of the embodiments of the present invention comprises a carbamate-based adhesive layer. Within the scope of not compromising the effects of the present invention, any suitable release liner with release properties may also be adhered to the adhesive side of the carbamate-based adhesive layer.

[0018] The surface protective film of the present invention preferably comprises a substrate layer and a carbamate-based adhesive layer. The substrate layer may be a single layer or two or more layers. The carbamate-based adhesive layer may be a single layer or two or more layers. In addition to the substrate layer and carbamate-based adhesive layer, the surface protective film of the present invention may also have any other suitable layers, provided that the effects of the present invention are not compromised.

[0019] Figure 1 is a schematic cross-sectional view of a surface protective film according to a preferred embodiment of the present invention. The surface protective film 10 includes a substrate layer 1 and an adhesive layer 2. The surface protective film of the present invention may also have any other suitable layers, such as a release liner (not shown), as needed.

[0020] For the side of the substrate layer 1 where the adhesive layer 2 is not attached, for the purpose of forming a winding that is easy to unwind, for example, aliphatic amide, polyethylene imide, long-chain alkyl additives, etc. can be added to the substrate layer for release treatment, or a coating containing any suitable release agent such as silicone, long-chain alkyl, or fluorine can be provided.

[0021] Release pads that can be present on the adhesive side of a carbamate-based adhesive layer include, for example, release pads formed by treating the surface of a substrate such as paper or plastic film (pad substrate) with silicone; and release pads formed by laminating a polyolefin resin onto the surface of a substrate such as paper or plastic film (pad substrate).

[0022] Examples of plastic films used as the base material for release liner include: polyethylene film, polypropylene film, polybutene film, polybutadiene film, polymethylpentene film, polyvinyl chloride film, vinyl chloride copolymer film, polyethylene terephthalate film, polybutylene terephthalate film, polyurethane film, ethylene-vinyl acetate copolymer film, etc.

[0023] The thickness of the release liner is preferably 1 μm to 500 μm, more preferably 3 μm to 450 μm, even more preferably 5 μm to 400 μm, and even more preferably 10 μm to 300 μm.

[0024] The thickness of the surface protective film in the embodiments of the present invention can be set to any appropriate thickness depending on the application. The thickness of the surface protective film is preferably 10 μm to 300 μm, more preferably 15 μm to 250 μm, even more preferably 20 μm to 200 μm, and even more preferably 25 μm to 150 μm.

[0025] The surface protective film of the embodiments of the present invention can improve the surface elastic modulus of the carbamate adhesive layer. Therefore, the surface elastic modulus of the carbamate adhesive layer included in the surface protective film of the present invention is, in a representative sense, 0.8 MPa or more, preferably 1.2 MPa or more, more preferably 1.5 MPa or more, further preferably 2.0 MPa or more, particularly preferably 2.5 MPa or more, and for example, 4.0 MPa or less. If the surface elastic modulus of the carbamate adhesive layer is at or above the above lower limit, the surface protective film of the embodiments of the present invention can exhibit excellent surface protection. Furthermore, the surface elastic modulus of the urethane adhesive layer can be determined according to ISO 14577.

[0026] For surface protective films, a thicker film is sometimes required to follow the step difference when protecting an adherend with a step difference. In the surface protective film of the embodiments of the present invention, the carbamate adhesive layer can be thickened. Therefore, the lower limit of the thickness of the carbamate adhesive layer included in the surface protective film of the present invention is preferably 1 μm or more, preferably 5 μm or more, more preferably 10 μm or more, more preferably 20 μm or more, more preferably 30 μm or more, more preferably 40 μm or more, more preferably 50 μm or more, particularly preferably 60 μm or more, and most preferably 65 μm or more. If the carbamate adhesive layer can be thickened in this way, the surface protective film of the embodiments of the present invention can follow the step difference well when protecting displays with large step differences, such as organic EL displays. Furthermore, the upper limit of the thickness of the carbamate adhesive layer is, representatively, 150 μm or less. The upper limit of the thickness of the carbamate adhesive layer can be appropriately changed depending on the application; for example, it can be set to less than 100 μm.

[0027] For surface protective films, light peelability is sometimes required, allowing for smooth peeling from the adherend when the surface protection is no longer needed. The surface protective film of the embodiments of the present invention exhibits light peelability. When the surface protective film of the present invention, after its contained carbamate-based adhesive layer is adhered to a glass plate and subjected to 30 minutes at 23°C, is peeled from the glass plate at a peel angle of 180 degrees and a peel speed of 300 mm / min, the peel force is preferably 0.5 gf / 25 mm to 5.0 gf / 25 mm, more preferably 0.5 gf / 25 mm to 4.0 gf / 25 mm, further preferably 0.5 gf / 25 mm to 3.0 gf / 25 mm, particularly preferably 0.5 gf / 25 mm to 2.5 gf / 25 mm, and most preferably 0.5 gf / 25 mm to 2.0 gf / 25 mm. If the peel force is within the above range, the surface protective film of the embodiments of the present invention exhibits excellent light peelability.

[0028] For surface protective films, transparency (low haze) is sometimes required so that the adhered object can be inspected while it is attached to it. The surface protective film of the present invention achieves low haze. In the surface protective film of the present invention, the haze of the urethane-based adhesive layer is preferably 4.5% or less, more preferably 4.0% or less, further preferably 3.5% or less, particularly preferably 3.0% or less, and most preferably 2.5% or less. If the haze is within the above range, the surface protective film of the present invention achieves excellent low haze, for example, excellent inspectability.

[0029] For surface protective films, it is sometimes necessary to reduce paste residue, which refers to the adhesive residue remaining on the adherend after peeling. In the embodiments of the present invention, after the surface protective film containing the urethane-based adhesive layer is bonded to a glass plate and kept at 23°C for 24 hours, after peeling from the glass plate at a peel angle of 180 degrees and a peel speed of 0.3 m / min, the residual adhesion rate to the glass plate is preferably 60% or more, more preferably 70% or more, further preferably 80% or more, particularly preferably 85% or more, and most preferably 90% or more. If the above residual adhesion rate is within the above range, the surface protective film of the embodiments of the present invention can reduce paste residue.

[0030] For surface protective films, from the viewpoint of reducing damage to the adherend, it is sometimes necessary to suppress static electricity during peeling from the adherend. In embodiments of the present invention, after the surface protective film containing the urethane-based adhesive layer is adhered to a glass plate and peeled from the glass plate at a peel angle of 150 degrees and a peel speed of 30 m / min for 24 hours at 23°C, the peel static voltage is preferably 15 kV or less, more preferably 10 kV or less, further preferably 5 kV or less, particularly preferably 2 kV or less, and most preferably 1 kV or less. If the peel static voltage is within the above range, the surface protective film of the present invention can effectively prevent static electricity during peeling.

[0031] ≪1-1. Carbamate-based adhesive layer≫ The carbamate adhesive layer comprises a carbamate adhesive formed from a carbamate adhesive composition. That is, the carbamate adhesive formed from the carbamate adhesive composition becomes an adhesive layer by constituting the shape of the layer.

[0032] Carbamate adhesives can be defined as those formed from carbamate adhesive compositions. This is because carbamate adhesive compositions undergo cross-linking reactions due to heating or ultraviolet irradiation, thus becoming carbamate adhesives. Therefore, it is impossible to directly specify carbamate adhesives based on their structure, and such a direct definition would be completely impractical. Therefore, by defining them as "formed from carbamate adhesive compositions," carbamate adhesives are reliably defined as "objects."

[0033] As a method for forming the carbamate-based adhesive layer, any suitable forming method can be employed within the scope of not impairing the effects of the present invention. Examples of such forming methods include: directly applying the carbamate-based adhesive composition to any suitable substrate film (e.g., the substrate layer in the surface protective film of an embodiment of the present invention) and allowing it to dry or harden (direct method); applying the carbamate-based adhesive composition to the surface (release surface) of a release liner and allowing it to dry or harden, thereby forming a carbamate-based adhesive layer on that surface, and then attaching the carbamate-based adhesive layer to the substrate film (e.g., the substrate layer in the surface protective film of an embodiment of the present invention) and transferring the carbamate-based adhesive layer (transfer method). From the viewpoint of adhesive layer adhesion, the direct method is generally preferred.

[0034] As a method for imparting (typically, coating) such a carbamate adhesive layer, various previously known methods may be appropriately employed, such as roller coating, gravure coating, reverse coating, contact coating, dip roller coating, bar coating, roller brush coating, spraying, scraping, air knife coating, spraying, corner wheel coating, direct coating, and coating using a die-cutting machine.

[0035] The drying of the carbamate-based adhesive composition can be carried out under heating (e.g., by heating to about 60°C to 150°C) as needed. Methods for hardening the carbamate-based adhesive composition may include, for example, appropriate use of ultraviolet light, laser rays, alpha rays, beta rays, gamma rays, X-rays, or electron beams.

[0036] Carbamate-based adhesive compositions (A) comprises a carbamate prepolymer, a polyol, and a polyfunctional isocyanate compound, wherein the carbamate prepolymer and / or the polyol has a structural unit represented by the following general formula (1); or (B) A urethane prepolymer comprising a structural unit having the structural unit shown in general formula (1) below, and a polyfunctional isocyanate compound; or (C) includes a polyol having a structural unit as shown in the general formula (1) below, and a polyfunctional isocyanate compound. [Chemistry 1] (In general formula (1), R1 represents one of the groups selected from hydrogen atoms, alkyl groups with 1 to 4 carbon atoms, and hydroxyalkyl groups with 1 to 6 carbon atoms. Multiple R1s may be the same or different. n represents an integer from 1 to 4. m is the number of repetitions of the structural unit, representing an integer from 1 to 200) The urethane adhesive is formed from an urethane prepolymer and / or polyol having structural units of the above general formula (1), thereby allowing for a substantial increase in the surface elastic modulus of the urethane adhesive layer.

[0037] Furthermore, in this specification, "urethane prepolymer" refers to the "urethane prepolymer" commonly used by manufacturers of urethane resins, and is different from "polyol". In other words, "polyol" does not include urethane prepolymer (typically, polyurethane polyol).

[0038] Examples of alkyl groups represented by R1 in general formula (1) include: linear alkyl groups such as methyl, ethyl, and n-propyl; and branched alkyl groups such as isopropyl, isobutyl, and 2-ethylhexyl.

[0039] Examples of hydroxyalkyl groups represented by R1 in general formula (1) include hydroxymethyl, 2-hydroxyethyl, 2-methyl-1,4-hydroxybutyl, etc.

[0040] In general formula (1), R1 can preferably be alkyl and hydrogen atoms as described above, and even more preferably methyl and hydrogen atoms.

[0041] In general formula (1), n ​​is preferably 1 to 3, more preferably 1 or 2, and even more preferably 2.

[0042] In general formula (1), m is preferably 10~100, more preferably 15~75, and even more preferably 20~50.

[0043] Furthermore, the above-mentioned urethane prepolymer and / or the above-mentioned polyol preferably have the structural unit (polyoxyalkylene unit) shown in the following general formula (2). More specifically, when the urethane adhesive composition is in the state of (A) above, it is preferable that the urethane prepolymer contains the structural unit (polyoxyalkylene unit) shown in the following general formula (2), and / or the polyol contains a polyol having the structural unit (polyoxyalkylene unit) shown in the following general formula (2). Furthermore, when the urethane adhesive composition is in the state described in (B) above, the urethane prepolymer preferably has a structural unit (polyoxyalkylene unit) as shown in the following general formula (2). Furthermore, when the carbamate adhesive composition is in the state described in (C) above, the polyol is preferably a polyol containing a structural unit (polyoxyalkylene unit) of the following general formula (2). [Chemistry 2] (In general formula (2), R2 represents one of the groups selected from hydrogen atoms and alkyl groups with 1 to 4 carbon atoms. Multiple R2s may be the same or different. p is the number of repetitions of the structural unit, representing an integer from 1 to 300)

[0044] Examples of alkyl groups represented by R2 in general formula (2) include: linear alkyl groups such as methyl, ethyl, and n-propyl; and branched alkyl groups such as isopropyl and isobutyl.

[0045] In general formula (2), p is preferably 10~250, more preferably 20~200, and even more preferably 30~150.

[0046] The content of the structural unit shown in the above general formula (1) in the such carbamate adhesive composition is, for example, 40% by weight or more, preferably 50% by weight or more, more preferably 60% by weight or more, and for example, 100% by weight or less, preferably 80% by weight or less.

[0047] The proportion of the structural unit represented by the above general formula (1) in the carbamate adhesive composition is greater than the proportion of the structural unit represented by the above general formula (2). The ratio of the structural unit shown in the above general formula (1) to the total of the structural units shown in the above general formula (1) and the structural units shown in the above general formula (2) is, for example, 50% by weight or more, preferably 60% by weight or more, and more preferably 65% ​​by weight or more, and for example, 100% by weight or less, preferably 80% by weight or less. If the ratio of the structural units shown in the above general formula (1) is above the lower limit, the surface elastic modulus of the urethane adhesive layer can be stably increased.

[0048] <1-1-A. A form of urethane-based adhesive composition comprising urethane prepolymer, polyol, and polyfunctional isocyanate compound> In the above-described (A) state, the carbamate adhesive is manufactured by a prepolymer method, and is formed from a carbamate adhesive composition containing a carbamate prepolymer, a polyol, and a polyfunctional isocyanate compound. The carbamate adhesive layer containing the carbamate adhesive manufactured by the prepolymer method as described above can be made into a thick film, thereby effectively following the step differences when protecting displays with large step differences, such as organic EL displays. More specifically, the carbamate adhesive is formed by curing a carbamate adhesive composition containing a carbamate prepolymer, a polyol, and a polyfunctional isocyanate compound. Preferably, the carbamate prepolymer and the polyol react with the polyfunctional isocyanate compound to form a carbamate resin.

[0049] As described above, in state (A), the carbamate prepolymer and / or polyol have the structural units shown in the above general formula (1). Preferably, at least the carbamate prepolymer has the structural units shown in the above general formula (1), and more preferably, both the carbamate prepolymer and the polyol have the structural units shown in the above general formula (1). If the carbamate prepolymer has the structural units shown in the above general formula (1), the surface elastic modulus of the carbamate adhesive layer can be stably increased compared to a state in which only the polyol has the structural units shown in the above general formula (1). As described above, the urethane prepolymer and / or polyol have the structural units shown in the above general formula (1). Therefore, the urethane prepolymer and polyol, and the urethane resin formed by reacting the urethane with the polyfunctional isocyanate compound, contain structural units derived from the structural units shown in the above general formula (1) (hereinafter referred to as structural units derived from general formula (1)). When the structural unit shown in the above general formula (1) contains hydrogen atoms and / or alkyl groups as R 1, the hydrogen atoms and / or alkyl groups do not react in the above carbamate reaction and are contained in the structural unit derived from general formula (1). When the structural unit shown in the above general formula (1) contains a hydroxyalkyl group as R1, the hydroxyalkyl group does not react in the above carbamate reaction. It can be contained in the structural unit derived from general formula (1), or it can be bonded to the functional groups contained in other structural units to form a cross-linked structure (for example, a cross-linked structure containing carbamate bonds formed by the reaction of the hydroxyl group of the hydroxyalkyl group with the isocyanate group of the polyfunctional isocyanate compound (intramolecular bond or intermolecular bond). The content of structural units derived from general formula (1) in the urethane resin is, for example, 40% by weight or more, preferably 50% by weight or more, more preferably 60% by weight or more, and for example, 100% by weight or less, preferably 80% by weight or less. Furthermore, the content of the structural units can be determined by 1H-NMR and 13C-NMR.

[0050] Furthermore, as described above, in state (A), the carbamate prepolymer and / or polyol preferably have the structural unit shown in the above general formula (2), therefore the carbamate resin contains the structural unit shown in the above general formula (2). Moreover, the hydrogen atoms and / or alkyl groups contained in the structural unit shown in the above general formula (2) in the form of R 2 do not react in the above carbamate reaction. The content of the structural unit of general formula (2) in the urethane resin is, for example, 10% by weight or more, preferably 15% by weight or more, more preferably 20% by weight or more, and for example, 50% by weight or less, preferably 40% by weight or less. The ratio of the structural unit derived from the above general formula (1) to the total of the structural units derived from the above general formula (1) and the structural units shown in the above general formula (2) is, for example, more than 50% by weight, preferably more than 55% by weight, more preferably more than 60% by weight, and for example less than 100% by weight, preferably less than 80% by weight. If the ratio of the structural units derived from the structural units of general formula (1) is above the lower limit mentioned above, the surface elastic modulus of the urethane adhesive layer can be further stably improved.

[0051] The weight ratio of the total amount of urethane prepolymer, polyol, and polyfunctional isocyanate compound in the urethane-based adhesive composition is preferably 50% to 100% by weight, more preferably 70% to 100% by weight, further preferably 90% to 100% by weight, particularly preferably 95% to 100% by weight, and most preferably 98% to 100% by weight. By adjusting the weight ratio of the total amount of urethane prepolymer and polyol in the urethane-based adhesive composition to the above range, the surface protective film of the present invention can effectively exhibit the effects of the present invention.

[0052] The preferred weight ratio of urethane prepolymer to polyol in the urethane-based adhesive composition is urethane prepolymer:polyol = (50~100):(0~50), more preferably (50~99):(1~50), further preferably (50~90):(10~50), particularly preferably (50~80):(20~50), and even more preferably (50~70):(30~50). By adjusting the weight ratio of urethane prepolymer to polyol in the urethane-based adhesive composition to the above range, the surface protective film of the present invention can effectively exhibit the effects of the present invention.

[0053] The equivalent ratio of NCO groups to OH groups in the urethane prepolymer, polyol, and polyfunctional isocyanate compound, expressed as NCO / OH groups, is preferably 1.0 to 2.0, more preferably 1.1 to 1.9, further preferably 1.2 to 1.8, and even more preferably 1.2 to 1.7. By adjusting the equivalent ratio of NCO groups to OH groups to the above range, the surface protective film of the embodiments of the present invention, even when adhered to an adherend with a large surface gradient, achieves a sufficiently high adhesion rate due to its superior wettability and thus superior gradient following ability.

[0054] Regarding the content ratio of the polyfunctional isocyanate compound in the carbamate-based adhesive composition, relative to 100 parts by weight of the total carbamate prepolymer and polyol, it is preferably 2.5 parts by weight to 40 parts by weight, more preferably 4 parts by weight to 30 parts by weight, further preferably 5 parts by weight to 20 parts by weight, and even more preferably 6 parts by weight to 15 parts by weight. By adjusting the content ratio of the polyfunctional isocyanate compound to the above range, the surface protective film of the embodiments of the present invention, even when adhered to an adhesive with a large surface gradient, can achieve a sufficiently high adhesion rate due to its superior wettability and thus superior gradient tracking.

[0055] <1-1-A-1. Carbamate Prepolymer> In a representative manner, the urethane prepolymer is a polyurethane polyol, preferably formed by reacting a polyether polyol with an organic polyisocyanate compound in the presence of a catalyst or without a catalyst. The urethane prepolymer may also be a commercially available urethane prepolymer.

[0056] The urethane prepolymer may be of only one type or more than two types.

[0057] The number average molecular weight (Mn) of the urethane prepolymer is preferably 1,000 to 100,000.

[0058] As a polyether polyol, any suitable polyether polyol can be used within the scope that does not impair the effects of the present invention. Examples of such polyether polyols include: using low molecular weight polyols such as water, propylene glycol, ethylene glycol, glycerol, and trimethylolpropane as initiators to induce oxidation of ethylene oxide, propylene oxide, butane oxide, tetrahydrofuran, etc. Polyether polyols obtained by polymerizing (oxirane) compounds. Examples of such polyether polyols include polypropylene glycol, polyethylene glycol, and poly(1,4-butanediol) with two or more functional groups.

[0059] Regarding the molecular weight of the polyether polyol, both low and high molecular weights are acceptable. The number average molecular weight is preferably 1000-5000. If the number average molecular weight is less than 1000, there is a risk of increased reactivity and easy gelation. If the number average molecular weight exceeds 5000, there is a risk of decreased reactivity and consequently, reduced cohesiveness of the polyurethane polyol itself. Regarding the amount of polyether polyol (p2) used, it is preferably 10 mol% to 100 mol% among the polyols constituting the urethane prepolymer (representatively, a polyurethane polyol).

[0060] For polyether polyols, as needed, a portion can be replaced with diols such as ethylene glycol, 1,4-butanediol, neopentyl glycol, butyl ethyl pentanediol, glycerol, trimethylolpropane, pentaerythritol, or polyamines such as ethylenediamine, N-aminoethyl ethanolamine, isophorone diamine, phenylenediamine, etc., and used in combination.

[0061] Polyether polyols can be made using only difunctional polyether polyols, or a portion or all of polyether polyols with a number average molecular weight of 1000-5000 and having at least three hydroxyl groups per molecule can be used. If a portion or all of the polyether polyols are made using polyether polyols with a number average molecular weight of 1000-5000 and having at least three hydroxyl groups per molecule, a good balance between adhesion and re-peelability can be achieved. In such polyether polyols, if the number average molecular weight is less than 1000, there is a risk of increased reactivity and easy gelation. Furthermore, in such polyether polyols, if the number average molecular weight exceeds 5000, there is a risk of decreased reactivity, and consequently, a decrease in the cohesive strength of the urethane prepolymer (typically, polyurethane polyol). The number average molecular weight of such polyether polyols is preferably 2500-3500.

[0062] This type of polyether polyol can be used alone or in combination.

[0063] When the urethane prepolymer has the structural unit shown in the above general formula (1), the polyether polyol is preferably a polyether polyol containing the structural unit shown in the above general formula (1). The polyether polyol having the structural unit shown in the above general formula (1) is preferably a polyether polyol containing a plurality of structural units (polyoxyalkylene units) in which all R1 are hydrogen atoms and have 3 or more carbon atoms. More preferably, it is poly1,4-butanediol.

[0064] The polyether polyol having the structural unit shown in the above general formula (1) contains, for example, 50% by weight or more, preferably 60% by weight or more, more preferably 70% by weight or more, and for example, 100% by weight or less, preferably 90% by weight or less.

[0065] When the urethane prepolymer has the structural unit shown in the above general formula (2), the polyether polyol is preferably a polyether polyol having the structural unit shown in the above general formula (1), and also includes a polyether polyol having the structural unit shown in the above general formula (2). The polyether polyol having the structural unit shown in the above general formula (2) is preferably a polyether polyol containing a structural unit (polyoxypropyl unit) in which one of the plurality of R2 is methyl and the remaining R2 are hydrogen atoms. More preferably, it is polypropylene glycol.

[0066] The content ratio of the polyether polyol having the structural unit shown in the above general formula (2) to the total amount of polyether polyol is, for example, 0% by weight or more, preferably 10% by weight or more, and for example, 50% by weight or less, preferably 40% by weight or less, and even more preferably 30% by weight or less.

[0067] Furthermore, when the urethane prepolymer does not have the structural unit shown in the above general formula (1), the urethane prepolymer is preferably formed by reacting polyether polyol, polyester polyol and organic polyisocyanate compound that do not have the structural unit shown in the above general formula (1). In this case, the polyether polyol is preferably a polyether polyol having the structural unit shown in the above general formula (2), and more preferably polypropylene glycol.

[0068] As the polyester polyol, any suitable polyester polyol may be used within the scope of not impairing the effects of the present invention. Examples of such polyester polyols include: polyester polyols obtained by reacting an acid component with a diol component. Examples of acid components include: terephthalic acid, adipic acid, azelaic acid, sebacic acid, phthalic anhydride, isophthalic acid, and trimellitic acid. Examples of diol components include: ethylene glycol, propylene glycol, diethylene glycol, butanediol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, 3,3'-dimethylolheptane, polyoxyethylene glycol, polyoxypropylene glycol, 1,4-butanediol, neopentanediol, and butylethylpentanediol. Examples of polyol components include: glycerin, trimethylolpropane, and pentaerythritol. In addition to the above, other examples of polyester polyols include those obtained by ring-opening polymerization of lactones such as polycaprolactone, poly(β-methyl-γ-valerolactone), and polyvalerolactone.

[0069] Regarding the molecular weight of polyester polyols, both low and high molecular weights are acceptable. The preferred number average molecular weight is 500–5000. If the number average molecular weight is less than 500, there is a risk of increased reactivity and easy gelation. If the number average molecular weight exceeds 5000, there is a risk of decreased reactivity, resulting in reduced cohesiveness of the polyurethane polyol itself. Regarding the amount of polyester polyol used, the preferred amount among the polyols constituting the urethane prepolymer (representatively, polyurethane polyol) is 10 mol%–90 mol.

[0070] As an organic polyisocyanate compound, any suitable organic polyisocyanate compound may be used within the scope that does not impair the effects of the present invention. Examples of such organic polyisocyanate compounds include: aromatic polyisocyanates, aliphatic polyisocyanates, aromatic aliphatic polyisocyanates, and alicyclic polyisocyanates.

[0071] Examples of aromatic polyisocyanates include: 1,3-epoxyphenyl diisocyanate, 4,4'-diphenyl diisocyanate, 1,4-epoxyphenyl diisocyanate, 4,4'-diphenylmethane diisocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 4,4'-toluidine diisocyanate, etc.; and 2,4,6-toluene triisocyanate, 1,3,5-triisocyanate benzene, anisidine diisocyanate, 4,4'-diphenyl ether diisocyanate, 4,4',4''-triphenylmethane triisocyanate, etc.

[0072] Examples of aliphatic polyisocyanates include: trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, 1,2-endopropyl diisocyanate, 2,3-endobutyl diisocyanate, 1,3-endobutyl diisocyanate, dodecamethyl diisocyanate, and 2,4,4-trimethylhexamethylene diisocyanate.

[0073] Examples of aromatic aliphatic polyisocyanates include: ω,ω'-diisocyanate-1,3-dimethylbenzene, ω,ω'-diisocyanate-1,4-dimethylbenzene, ω,ω'-diisocyanate-1,4-diethylbenzene, 1,4-tetramethylbenzene dimethyl diisocyanate, 1,3-tetramethylbenzene dimethyl diisocyanate, and other aromatic aliphatic diisocyanates.

[0074] Examples of alicyclic polyisocyanates include: 3-isocyanomethyl-3,5,5-trimethylcyclohexyl ester, 1,3-cyclopentene diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, methyl-2,4-cyclohexane diisocyanate, methyl-2,6-cyclohexane diisocyanate, 4,4'-methylenebis(cyclohexyl isocyanate), 1,4-bis(isocyanomethyl)cyclohexane, 1,4-bis(isocyanomethyl)cyclohexane, and other alicyclic diisocyanates.

[0075] As an organic polyisocyanate compound, it can be combined with trimethylolpropane adducts, biuret bodies formed by reaction with water, and isocyanurates having an isocyanurate ring (e.g., trimers).

[0076] This type of organic polyisocyanate compound can be used alone or in combination. The organic polyisocyanate compound is preferably a diisocyanate, more preferably an aliphatic diisocyanate, and especially preferably a hexamethylene diisocyanate.

[0077] As a catalyst used in the manufacture of urethane prepolymers (typically polyurethane polyols), any suitable catalyst may be used without impairing the effects of the present invention. Examples of such catalysts include tertiary amine compounds and organometallic compounds.

[0078] Examples of tertiary amine compounds include triethylamine, triethylenediamine, and 1,8-diazabicyclo-(5,4,0)-undecene-7 (DBU).

[0079] Examples of organometallic compounds include tin compounds and non-tin compounds.

[0080] Examples of tin-based compounds include: dibutyltin dichloride, dibutyltin oxide, dibutyltin dibromide, dibutyltin maleate, dibutyltin dilaurate (DBTDL), dibutyltin diacetate, dibutyltin sulfide, tributyltin sulfide, tributyltin oxide, tributyltin acetate, triethylethanotin, tributylethanotin, dioctyltin oxide, tributyltin chloride, trichloroacetic acid tributyltin, and 2-ethylhexanoate tin.

[0081] Examples of non-tin compounds include: titanium compounds such as dibutyltitanium dichloride, tetrabutyl titanate, and butoxytitanium trichloride; lead compounds such as lead oleate, lead 2-ethylhexanoate, lead benzoate, and lead naphthenate; iron compounds such as ferric 2-ethylhexanoate and ferric acetopyruvate; cobalt compounds such as cobalt benzoate and cobalt 2-ethylhexanoate; zinc compounds such as zinc naphthenate and zinc 2-ethylhexanoate; and zirconium compounds such as zirconium naphthenate.

[0082] When a catalyst is used in the manufacture of urethane prepolymers (typically polyurethane polyols), the catalyst may be used alone or in combination. Preferably, the catalyst is a tin-based compound, and more preferably, dibutyltin dilaurate (DBTDL).

[0083] When a catalyst is used in the manufacture of urethane prepolymers (typically polyurethane polyols), the amount of catalyst used is preferably 0.01% to 1.0% by weight relative to the total amount of polyol and organic polyisocyanate compound.

[0084] When using a catalyst in the manufacture of urethane prepolymers (typically polyurethane polyols), the reaction temperature is preferably below 100°C, and more preferably between 85°C and 95°C. If the temperature reaches above 100°C, it may be difficult to control the reaction rate and crosslinking structure, and it may be difficult to obtain urethane prepolymers (typically polyurethane polyols) with a specific molecular weight.

[0085] When manufacturing urethane prepolymers (typically polyurethane polyols), a catalyst may not be used. In this case, the reaction temperature is preferably 100°C or higher, more preferably 110°C or higher. Furthermore, when obtaining urethane prepolymers (typically polyurethane polyols) without a catalyst, the reaction time is preferably 3 hours or higher.

[0086] Methods for manufacturing urethane prepolymers (typically polyurethane polyols) include, for example, the following: 1) adding all polyols such as polyether polyols, catalysts, and organic polyisocyanate compounds to a flask; 2) adding polyols such as polyether polyols and catalysts to a flask and then adding the organic polyisocyanate compound dropwise. From the perspective of controlling the reaction, method 2) is preferred for manufacturing urethane prepolymers (typically polyurethane polyols).

[0087] In the manufacture of urethane prepolymers (typically polyurethane polyols), any suitable solvent may be used without impairing the effects of the present invention. Examples of such solvents include methyl ethyl ketone, ethyl acetate, toluene, xylene, and acetone. Among these solvents, ethyl acetate and toluene are preferred.

[0088] <1-1-A-2. Polyol> Examples of polyols include: polyester polyols, polyether polyols, polycaprolactone polyols, polycarbonate polyols, and castor oil-based polyols.

[0089] As a polyester polyol, it can be obtained, for example, through the esterification reaction of polyol components and acid components.

[0090] Examples of polyol components include: ethylene glycol, diethylene glycol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, 3-methyl-1,5-pentanediol, 2-butyl-2-ethyl-1,3-propanediol, 2,4-diethyl-1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1,8-octanediol, 1,9-nonanediol, 2-methyl-1,8-octanediol, 1,8-decanediol, octadecanediol, glycerin, trimethylolpropane, pentaerythritol, hexanetriol, and polypropylene glycol.

[0091] Examples of acidic components include: succinic acid, methylsuccinic acid, adipic acid, pimelic acid, azelaic acid, sebacic acid, 1,12-dodecanoic acid, 1,14-tetradecanoic acid, dimer acid, 2-methyl-1,4-cyclohexanedicarboxylic acid, 2-ethyl-1,4-cyclohexanedicarboxylic acid, terephthalic acid, isophthalic acid, phthalic acid, isophthalic acid, terephthalic acid, 1,4-naphthalenedicarboxylic acid, 4,4'-biphenyl dicarboxylic acid, and their anhydrides.

[0092] Examples of polyether polyols include those obtained by addition polymerization of ethylene oxide, propylene oxide, and butane oxide using water, low-molecular-weight polyols (propylene glycol, ethylene glycol, glycerol, trimethylolpropane, pentaerythritol, etc.), bisphenols (bisphenol A, etc.), and dihydroxybenzenes (catechol, resorcinol, hydroquinone, etc.) as initiators. Specifically, examples include polyethylene glycol, polypropylene glycol, and poly1,4-butanediol.

[0093] Examples of polycaprolactone polyols include caprolactone-based polyester diols obtained by ring-opening polymerization of cyclic ester monomers such as ε-caprolactone and σ-valerolactone.

[0094] Examples of polycarbonate polyols include: polycarbonate polyols obtained by polycondensation of the above-mentioned polyol components with phosgene; polycarbonate polyols obtained by transesterification condensation of the above-mentioned polyol components with dimethyl carbonate, diethyl carbonate, dipropyl carbonate, diisopropyl carbonate, dibutyl carbonate, ethylbutyl carbonate, ethylene carbonate, propylene carbonate, diphenyl carbonate, dibenzyl carbonate, etc.; copolymerized polycarbonate polyols obtained by using two or more of the above-mentioned polyol components; and polycarbonate polyols obtained by esterification of the above-mentioned polycarbonate polyols with carboxyl-containing compounds. Polycarbonate polyols obtained by reaction; polycarbonate polyols obtained by etherification reaction of the above-mentioned polycarbonate polyols with hydroxyl-containing compounds; polycarbonate polyols obtained by transesterification reaction of the above-mentioned polycarbonate polyols with ester compounds; polycarbonate polyols obtained by transesterification reaction of the above-mentioned polycarbonate polyols with hydroxyl-containing compounds; polyester-based polycarbonate polyols obtained by polycondensation reaction of the above-mentioned polycarbonate polyols with dicarboxylic acid compounds; and copolymer polyether-based polycarbonate polyols obtained by copolymerization of the above-mentioned polycarbonate polyols with epoxides.

[0095] As castor oil-based polyols, examples include castor oil-based polyols obtained by reacting castor oil fatty acids with the aforementioned polyol components. Specifically, examples include castor oil-based polyols obtained by reacting castor oil fatty acids with polypropylene glycol.

[0096] As a polyol, preferred examples include polyether polyols, and even more preferred examples include polyether polyols having the structural unit shown in the above general formula (1). The polyether polyol having the structural unit shown in the above general formula (1) is preferably a polyether polyol containing a plurality of R1s in which one is hydroxyalkyl and the remaining R1s are hydrogen atoms with 3 or more carbon atoms, and more preferably a polyether polyol containing a plurality of R1s in which one is hydroxyalkyl and the remaining R1s are hydrogen atoms with 4 carbon atoms.

[0097] In a representative sense, the polyol comprises a first polyol with a number average molecular weight Mn of 5000-20000 and a second polyol with a number average molecular weight Mn of 300-4999. By including a first polyol with a number average molecular weight Mn of 5000-20000 and a second polyol with a number average molecular weight Mn of 300-4999 in the polyol, the effects of the present invention can be further demonstrated.

[0098] The first polyol can be only one type, or it can be two or more types.

[0099] The second polyol can be only one type, or it can be two or more types.

[0100] Based on considerations that can further demonstrate the effects of the present invention, the total content ratio of the first polyol and the second polyol in the polyol is preferably 80% to 100% by weight, more preferably 90% to 100% by weight, even more preferably 95% to 100% by weight, particularly preferably 98% to 100% by weight, and most preferably substantially 100% by weight.

[0101] The number average molecular weight Mn of the first polyol is 5,000 to 20,000, preferably 6,000 to 18,000, more preferably 7,000 to 16,000, even more preferably 8,000 to 15,000, and even more preferably 9,000 to 14,000. If the number average molecular weight Mn of the first polyol is within the above range, the effects of the present invention can be further demonstrated.

[0102] The number average molecular weight Mn of the second polyol is 300-4999, preferably 350-4500, more preferably 400-4000, even more preferably 500-3800, and even more preferably 700-3500. If the number average molecular weight Mn of the second polyol is within the above range, the effects of the present invention can be further demonstrated.

[0103] The weight ratio of the first polyol to the second polyol is preferably 1.0 ≤ (first polyol / second polyol) ≤ 3.5, more preferably 1.0 ≤ (first polyol / second polyol) ≤ 3.0, further preferably 1.0 ≤ (first polyol / second polyol) ≤ 2.5, and even more preferably 1.0 ≤ (first polyol / second polyol) ≤ 2.0. If the weight ratio of the first polyol to the second polyol is within the above range, the haze of the surface protective film can be further reduced.

[0104] Based on considerations that can further demonstrate the effects of the present invention, the first polyol preferably has 3 to 6 OH groups, more preferably 3 to 5, and even more preferably 3 to 4, and especially preferably 3.

[0105] Based on considerations that can further demonstrate the effects of the present invention, the first polyol preferably contains 50% to 100% by weight of triol with 3 OH groups, more preferably 70% to 100% by weight, even more preferably 90% to 100% by weight, particularly preferably 95% to 100% by weight, and most preferably substantially 100% by weight.

[0106] The first polyol is preferably a polyether polyol containing the structural unit shown in the above general formula (2).

[0107] Based on considerations that can further demonstrate the effects of the present invention, the second polyol preferably has 3 to 6 OH groups, more preferably 3 to 5, and even more preferably 3 to 4, and especially preferably 3.

[0108] Based on considerations that can further demonstrate the effects of the present invention, in the second polyol, the triol having 3 OH groups preferably contains 50% to 100% by weight, more preferably 70% to 100% by weight, further preferably 90% to 100% by weight, even more preferably 95% to 100% by weight, and most preferably substantially 100% by weight.

[0109] The second polyol is preferably a polyether polyol containing the structural unit shown in the above general formula (1), or a polyether polyol containing the structural unit shown in the above general formula (2), and even more preferably a polyether polyol containing the structural unit shown in the above general formula (1).

[0110] <1-1-A-3. Polyfunctional Isocyanates> The polyfunctional isocyanate compound may be only one type or may be two or more types.

[0111] As a polyfunctional isocyanate compound, any suitable polyfunctional isocyanate compound that can be used by carbamate reaction can be employed. Examples of such polyfunctional isocyanate compounds include: polyfunctional aliphatic isocyanate compounds, polyfunctional alicyclic isocyanates, polyfunctional aromatic isocyanate compounds, and polyfunctional aromatic aliphatic diisocyanate compounds.

[0112] Examples of multifunctional aliphatic isocyanate compounds include: trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, 1,2-epoxypropyl diisocyanate, 1,3-epoxybutyl diisocyanate, epoxydodecyl diisocyanate, and 2,4,4-trimethylhexamethylene diisocyanate.

[0113] Examples of polyfunctional alicyclic isocyanate compounds include: 1,3-cyclopentene diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, hydrogenated phenyl dimethyl diisocyanate, hydrogenated toluene diisocyanate, hydrogenated tetramethylphenyl dimethyl diisocyanate, and other alicyclic diisocyanates.

[0114] Examples of multifunctional aromatic diisocyanate compounds include: phenyl diisocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 2,2'-diphenylmethane diisocyanate, 4,4'-diphenylmethane diisocyanate, 4,4'-toluidine diisocyanate, 4,4'-diphenyl ether diisocyanate, 4,4'-diphenyl diisocyanate, 1,5-naphthalene diisocyanate, and other aromatic diisocyanates.

[0115] Examples of polyfunctional aromatic aliphatic diisocyanate compounds include aromatic diisocyanates such as phenyl dimethyl diisocyanate.

[0116] Examples of polyfunctional isocyanate compounds include: trimethylolpropane adducts of the various polyfunctional isocyanate compounds mentioned above, biuret forms formed by the reaction with water, and isocyanurate forms (e.g., trimers) having an isocyanurate ring. Furthermore, they can be used in combination.

[0117] Based on considerations that can further demonstrate the effects of the present invention, the polyfunctional isocyanate compound preferably has an average number of isocyanate groups of 2 to 6, more preferably 2 to 5, and even more preferably 3 to 4.

[0118] As a multifunctional isocyanate compound, it is more preferably an isocyanate compound having an average number of three or more functional groups, and even more preferably an isocyanurate form of an aliphatic diisocyanate, and particularly preferably an isocyanurate form of hexamethylene diisocyanate.

[0119] <1-1-B. A form of urethane-based adhesive composition comprising urethane prepolymer and polyfunctional isocyanate compound> In state (B), the carbamate adhesive is manufactured by a prepolymer method and is formed from a carbamate adhesive composition containing a carbamate prepolymer and a polyfunctional isocyanate compound. In state (B), the urethane prepolymer contained in the urethane-based adhesive composition is the same as the urethane prepolymer described in <1-1-A-1> above, and the polyfunctional isocyanate compound contained in the urethane-based adhesive composition is the same as the polyfunctional isocyanate compound described in <1-1-A-3> above. In state (B), the urethane-based adhesive composition does not contain the polyol described in <1-1-A-2> above. More specifically, in state (B), the carbamate adhesive is formed by curing a carbamate adhesive composition containing a carbamate prepolymer and a polyfunctional isocyanate compound. Preferably, the carbamate prepolymer reacts with the polyfunctional isocyanate compound to form a carbamate resin.

[0120] In state (B), the urethane prepolymer has the structural unit shown in the above general formula (1). Therefore, the urethane resin obtained by reacting the urethane prepolymer with a polyfunctional isocyanate compound contains structural units derived from the structural unit shown in the above general formula (1) (hereinafter referred to as structural units derived from general formula (1)). The structural units derived from general formula (1) in the urethane resin and their content ratio are as explained in <1-1-A.> above.

[0121] Furthermore, in state (B), the urethane prepolymer preferably has the structural unit shown in the above general formula (2), therefore the urethane resin contains the structural unit shown in the above general formula (2). The content ratio of the structural unit shown in general formula (2) in the urethane resin is as explained in <1-1-A.> above.

[0122] In the carbamate-based adhesive composition, the range of the total weight ratio of the carbamate prepolymer to the polyfunctional isocyanate compound is the same as the range of the total weight ratio of the carbamate prepolymer, polyol and polyfunctional isocyanate compound in the state (A) above. In the urethane-based adhesive composition, the range of the equivalent ratio of NCO groups to OH groups in the urethane prepolymer and the polyfunctional isocyanate compound is the same as the range of the equivalent ratio of NCO groups to OH groups in the urethane prepolymer and the polyol and the polyfunctional isocyanate compound in state (A) above. The range of the content ratio of the polyfunctional isocyanate compound to 100 parts by weight of the carbamate prepolymer is the same as the range of the content ratio of the polyfunctional isocyanate compound to 100 parts by weight of the total carbamate prepolymer and polyol in the state (A) above.

[0123] <1-1-C. Carbamate-based adhesive compositions comprising polyols and polyfunctional isocyanate compounds> In state (C), the carbamate adhesive is manufactured by a one-step process and is formed from a carbamate adhesive composition containing polyols and polyfunctional isocyanate compounds. In state (C), the polyol contained in the urethane-based adhesive composition is the same as the polyol described in <1-1-A-2> above, and the polyfunctional isocyanate compound contained in the urethane-based adhesive composition is the same as the polyfunctional isocyanate compound described in <1-1-A-3> above. In state (C), the urethane-based adhesive composition does not contain the urethane prepolymer described in <1-1-A-1> above. More specifically, in state (C), the carbamate adhesive is formed by curing a carbamate adhesive composition containing a polyol and a polyfunctional isocyanate compound. Preferably, the polyol reacts with the polyfunctional isocyanate compound to form a carbamate resin.

[0124] In state (C), the polyol has the structural unit shown in the above general formula (1). Therefore, the urethane resin obtained by reacting a polyol with a polyfunctional isocyanate compound to form an urethane resin contains structural units derived from the structural unit shown in the above general formula (1) (hereinafter referred to as structural units derived from general formula (1)). The structural units derived from general formula (1) in the urethane resin and their content ratio are as explained in <1-1-A.> above.

[0125] Furthermore, in state (C), the polyol is preferably a polyol having a structural unit derived from the structural unit shown in general formula (1), and also includes a polyol having a structural unit shown in general formula (2) above. Therefore, the urethane resin includes the structural unit shown in general formula (2) above. The content ratio of the structural unit shown in general formula (2) in the urethane resin is as explained in <1-1-A.> above.

[0126] In the urethane-based adhesive composition, the range of the total weight ratio of polyol and polyfunctional isocyanate compound is the same as the range of the total weight ratio of urethane prepolymer, polyol and polyfunctional isocyanate compound in the state (A) above. In the urethane-based adhesive composition, the range of the equivalent ratio of NCO groups to OH groups in the polyol and the polyfunctional isocyanate compound is the same as the range of the equivalent ratio of NCO groups to OH groups in the urethane prepolymer and the polyol and the polyfunctional isocyanate compound in state (A) above. The range of the content ratio of the polyfunctional isocyanate compound to 100 parts by weight of the polyol is the same as the range of the content ratio of the polyfunctional isocyanate compound to 100 parts by weight of the total of the carbamate prepolymer and the polyol in state (A) above.

[0127] <1-2 Other ingredients> The urethane-based adhesive composition may contain any other suitable components within the scope that does not impair the effects of the present invention. Examples of such other components include, for instance: resin components other than the aforementioned urethane prepolymers and polyols; crosslinking agents other than the aforementioned polyfunctional isocyanate compounds; crosslinking delay agents; ionic compounds; fluorinated additives; silicone additives; fatty acid esters; adhesion promoters; inorganic fillers; organic fillers; metal powders; pigments; foils; softeners; anti-aging agents; conductive agents; ultraviolet absorbers; antioxidants; light stabilizers; surface lubricants; leveling agents; preservatives; heat stabilizers; polymerization inhibitors; lubricants; solvents; and catalysts.

[0128] [Ionic compounds] If ionic compounds are included as other components, the antistatic properties of the surface protective film in embodiments of the present invention can be improved.

[0129] The content ratio of the ionic compound can be any appropriate ratio within the range that does not impair the effect of the present invention. Considering the possibility of further improving the antistatic properties of the surface protective film of the present invention, the content ratio of the ionic compound relative to the total 100 parts by weight of the above-mentioned carbamate prepolymer and polyol is preferably 0.05 parts by weight or more, more preferably 0.10 parts by weight to 50 parts by weight, further preferably 0.20 parts by weight to 30 parts by weight, particularly preferably 0.30 parts by weight to 10 parts by weight, and most preferably 0.30 parts by weight to 0.5 parts by weight. More specifically, when the carbamate adhesive composition is in the state (A) described above, since the carbamate adhesive composition contains carbamate prepolymer and polyol, the content ratio of ionic compounds is as described above. Furthermore, when the carbamate adhesive composition is in the state described in (B) above, since the carbamate adhesive composition does not contain polyols (i.e., 0 parts by weight), the range of the content ratio of ionic compounds to 100 parts by weight of carbamate prepolymer is as described above. Furthermore, when the carbamate-based adhesive composition is in the state described in (C) above, since the carbamate-based adhesive composition does not contain carbamate prepolymer (i.e., 0 parts by weight), the range of the content ratio of the ionic compound to 100 parts by weight of the polyol is as described above. If the content ratio of ionic compounds is within the above-mentioned range, the antistatic properties of the surface protective film of the present invention can be further improved. If the content ratio of ionic compounds is too low, the surface protective film of the present invention may not be able to impart sufficient antistatic properties. If the content ratio of ionic compounds is too high, the contamination of the adhered object may increase.

[0130] As an ionic compound, any suitable ionic compound may be used within the range that does not impair the effects of the present invention. There may be only one ionic compound or two or more ionic compounds.

[0131] For the purpose of further demonstrating the effects of the present invention, the ionic compound is preferably an ionic compound comprising at least one selected from onium cations and metal cations and an organic fluorine anion, or a silicone oligomer containing an ionic group. For the purpose of further improving the appearance of the adhesive layer, it is more preferably an ionic compound comprising at least one selected from onium cations and metal cations and an organic fluorine anion.

[0132] Ionic compounds can also be ionic liquids. Ionic liquids refer to molten salts (ionic compounds) that are liquid at 25°C.

[0133] As a silicone oligomer containing ionic groups, any suitable silicone oligomer containing ionic groups can be used within the scope of not impairing the effects of the present invention. For example, a silicone oligomer containing ionic groups is the product "X-40-2450" manufactured by Shin-Etsu Chemical Co., Ltd.

[0134] As the onium cation, any suitable onium cation may be used within the scope of not impairing the effects of the present invention. Based on considerations of further enhancing the effects of the present invention, such onium cation is preferably selected from at least one of ammonium cations (nitrogen-containing onium cations), strontium cations (sulfur-containing onium cations), and phosphorus-containing onium cations (phosphonium cations), with ammonium cations being more preferred.

[0135] As the metal cation, any suitable metal cation may be used within the scope of not impairing the effects of the present invention. Based on considerations of further enhancing the effects of the present invention, alkali metal cations such as Li cation, Na cation, and K cation are preferred.

[0136] As a fluorinated organic anion, any suitable fluorinated organic anion may be used within the scope of not impairing the effects of the present invention. The fluorinated organic anion may be fully fluorinated (perfluorinated) or partially fluorinated.

[0137] Examples of such fluorinated organic anions include: fluorinated aryl sulfonates, perfluoroalkyl sulfonates, bis(fluorosulfonyl)imines, bis(perfluoroalkyl)imines, cyanoperfluoroalkyl sulfonylamines, bis(cyano)perfluoroalkyl sulfonylmethylates, cyano-bis-(perfluoroalkyl)methylates, tri(perfluoroalkyl)methylates, trifluoroacetates, perfluoroalkylates, tri(perfluoroalkyl)methylates, and (perfluoroalkyl)trifluoroacetamides.

[0138] Among these fluorinated organic anions, based on considerations that can further demonstrate the effects of the present invention, perfluoroalkyl sulfonates, bis(fluorosulfonyl)imidine, and bis(perfluoroalkylsulfonyl)imidine are preferred. More specifically, for example, trifluoromethanesulfonate, pentafluoroethanesulfonate, heptafluoropropanesulfonate, nonafluorobutanesulfonate, bis(fluorosulfonyl)imidine, and bis(trifluoromethanesulfonyl)imidine are preferred.

[0139] As an ionic compound, it is more preferably an ionic compound containing onium cations and fluorine organic anions, based on the consideration of further demonstrating the effects of the present invention.

[0140] As a ium cation, it is preferred to have at least one structure selected from those represented by general formulas (3) to (6). [Chemistry 3]

[0141] In general formula (3), Ra represents a hydrocarbon group with 4 to 20 carbon atoms and may contain heteroatoms. Rb and Rc may be the same or different from each other, representing hydrogen or a hydrocarbon group with 1 to 16 carbon atoms and may contain heteroatoms. In the case where the nitrogen atom contains a double bond, there is no Rc.

[0142] In general formula (4), Rd represents a hydrocarbon group with 2 to 20 carbon atoms and may contain heteroatoms. Re, Rf, and Rg may be the same or different from each other, representing hydrogen or a hydrocarbon group with 1 to 16 carbon atoms and may contain heteroatoms.

[0143] In general formula (5), Rh represents a hydrocarbon group with 2 to 20 carbon atoms and may contain heteroatoms. Ri, Rj, and Rk may be the same or different from each other, representing hydrogen or a hydrocarbon group with 1 to 16 carbon atoms and may contain heteroatoms.

[0144] In general formula (6), Z represents a nitrogen atom, a sulfur atom, or a phosphorus atom, and Rl, Rm, Rn, and Ro are the same or different from each other, representing hydrocarbon groups with 1 to 20 carbon atoms, and may contain heteroatoms. When Z is a sulfur atom, there is no Ro.

[0145] Examples of cationic structures represented by general formula (3) include: pyridinium cationic structure, pyrrolidinium cationic structure, piperidinium cationic structure, cationic structure with pyrrololine skeleton, cationic structure with pyrrole skeleton, etc.

[0146] Specific examples of cations represented by general formula (3) include: 1-ethylpyridinium cation, 1-butylpyridinium cation, 1-hexylpyridinium cation, 1-ethyl-3-methylpyridinium cation, 1-butyl-3-methylpyridinium cation, 1-hexyl-3-methylpyridinium cation, 1-butyl-4-methylpyridinium cation, 1-octyl-4-methylpyridinium cation, 1-butyl-3,4-dimethylpyridinium cation, 1,1-dimethylpyrrolidinium cation, and other pyridinium cations; 1-ethyl-1-methyl Pyrrolidine-onium cation, 1-methyl-1-propylpyrrolidine-onium cation, 1-methyl-1-butylpyrrolidine-onium cation, 1-methyl-1-pentylpyrrolidine-onium cation, 1-methyl-1-hexylpyrrolidine-onium cation, 1-ethyl-1-propylpyrrolidine-onium cation, 1-ethyl-1-butylpyrrolidine-onium cation, 1-ethyl-1-pentylpyrrolidine-onium cation, 1-ethyl-1-hexylpyrrolidine-onium cation, 1-ethyl-1-heptylpyrrolidine-onium cation, 1,1-dipropylpyrrolidine Pyrrolidone cations include 1-propyl-1-butylpyrrolidone cation, 1,1-dibutylpyrrolidone cation, etc.; 1-propylpiperidine cations include 1-pentylpiperidine cation, 1-methyl-1-ethylpiperidine cation, 1-methyl-1-propylpiperidine cation, 1-methyl-1-butylpiperidine cation, 1-methyl-1-pentylpiperidine cation, 1-methyl-1-hexylpiperidine cation, 1-methyl-1-heptylpiperidine cation, 1-ethyl-1-propylpiperidine cation, and 1-ethyl-1-butylpiperidine cation. Piperidinium cations include 1-ethyl-1-pentylpiperidinium cations, 1-ethyl-1-hexylpiperidinium cations, 1-ethyl-1-heptylpiperidinium cations, 1-propyl-1-butylpiperidinium cations, 1,1-dimethylpiperidinium cations, 1,1-dipropylpiperidinium cations, and 1,1-dibutylpiperidinium cations; 2-methyl-1-pyrrolline cations; 1-ethyl-2-phenylindole cations; 1,2-dimethylindole cations; and 1-ethylcarbazole cations; wherein such cations further have at least one cation selected from vinyl (CH2=CH-yl) and allyl (CH2=CH-CH2-yl); etc.

[0147] Among them, based on considerations of further demonstrating the effects of the present invention, preferred examples include: 1-ethylpyridinium cation, 1-butylpyridinium cation, 1-hexylpyridinium cation, 1-ethyl-3-methylpyridinium cation, 1-butyl-3-methylpyridinium cation, 1-hexyl-3-methylpyridinium cation, 1-butyl-4-methylpyridinium cation, and 1-octyl-4-methylpyridinium. Pyridine-onium cations include: 1-ethyl-1-methylpyrrolidoneonium cation, 1-methyl-1-propylpyrrolidoneonium cation, 1-methyl-1-butylpyrrolidoneonium cation, 1-methyl-1-pentylpyrrolidoneonium cation, 1-methyl-1-hexylpyrrolidoneonium cation, 1-methyl-1-heptylpyrrolidoneonium cation, 1-ethyl-1-propylpyrrolidoneonium cation, and 1-ethyl-1-butylpyrrolidoneonium cation. Pyrrolidone cations include pyrrolidone cations such as pyridineonium cation, 1-ethyl-1-pentylpyrrolidone cation, 1-ethyl-1-hexylpyrrolidone cation, and 1-ethyl-1-heptylpyrrolidone cation; 1-methyl-1-ethylpiperidineonium cation, 1-methyl-1-propylpiperidineonium cation, 1-methyl-1-butylpiperidineonium cation, 1-methyl-1-pentylpiperidineonium cation, and 1-methyl-1-hexylpiperidineonium cation. Piperidine cations include 1-methyl-1-heptylpiperidine cations, 1-ethyl-1-propylpiperidine cations, 1-ethyl-1-butylpiperidine cations, 1-ethyl-1-pentylpiperidine cations, 1-ethyl-1-hexylpiperidine cations, 1-ethyl-1-heptylpiperidine cations, and 1-propyl-1-butylpiperidine cations; these cations further have a composition selected from vinyl (CH4) The cations may be at least one of vinyl (CH2=CH-) and allyl (CH2=CH-CH2-), preferably 1-hexylpyridinium cation, 1-ethyl-3-methylpyridinium cation, 1-butyl-3-methylpyridinium cation, 1-octyl-4-methylpyridinium cation, 1-methyl-1-propylpyrrolidinium cation, 1-methyl-1-propylpiperidinium cation, and the cations thereon may have at least one of vinyl (CH2=CH-) and allyl (CH2=CH-CH2-).

[0148] Examples of cationic structures represented by general formula (4) include imidazolium cationic structure, tetrahydropyrimidineonium cationic structure, dihydropyrimidineonium cationic structure, etc.

[0149] Specific examples of cations represented by general formula (4) include: 1,3-dimethylimidazolium cation, 1,3-diethylimidazolium cation, 1-ethyl-3-methylimidazolium cation, 1-butyl-3-methylimidazolium cation, 1-hexyl-3-methylimidazolium cation, 1-octyl-3-methylimidazolium cation, 1-decyl-3-methylimidazolium cation, 1-dodecyl-3-methylimidazolium cation, 1-tetradecyl-3-methylimidazolium cation, 1,2-dimethyl-3-propylimidazolium cation, 1-ethyl-2,3-dimethylimidazolium cation, 1-butyl-2,3-dimethylimidazolium cation, 1-hexyl-2,3-dimethylimidazolium cation, etc., imidazolium cations; 1,3-dimethyl-1,4,5,6 Tetrahydropyrimidine-onium cations, such as 1,2,3-trimethyl-1,4,5,6-tetrahydropyrimidine-onium cation, 1,2,3,4-tetramethyl-1,4,5,6-tetrahydropyrimidine-onium cation, and 1,2,3,5-tetramethyl-1,4,5,6-tetrahydropyrimidine-onium cation; 1,3-dimethyl-1,4-dihydropyrimidine-onium cation, 1,3-dimethyl-1 The cations include dihydropyrimidineonium cations such as 1,2,3-trimethyl-1,4-dihydropyrimidineonium cation, 1,2,3-trimethyl-1,6-dihydropyrimidineonium cation, 1,2,3,4-tetramethyl-1,4-dihydropyrimidineonium cation, and 1,2,3,4-tetramethyl-1,6-dihydropyrimidineonium cation; and the cations further include at least one cation selected from vinyl (CH 2=CH-yl) and allyl (CH 2=CH-CH 2-yl).

[0150] In order to further demonstrate the effects of the present invention, the preferred cations are 1,3-dimethylimidazolium cations, 1,3-diethylimidazolium cations, 1-ethyl-3-methylimidazolium cations, 1-butyl-3-methylimidazolium cations, 1-hexyl-3-methylimidazolium cations, 1-octyl-3-methylimidazolium cations, 1-decyl-3-methylimidazolium cations, 1-dodecyl-3-methylimidazolium cations, and 1-tetradecyl-3-methylimidazolium cations, wherein these cations further have at least one cation selected from vinyl (CH2=CH-yl) and allyl (CH2=CH-CH2-yl) as imidazolium cations, and more preferably 1-ethyl-3-methylimidazolium cations and 1-hexyl-3-methylimidazolium cations, wherein these cations further have at least one cation selected from vinyl (CH2=CH-yl) and allyl (CH2=CH-CH2-yl) as imidazolium cations. A cation of at least one of (CH2=CH-yl) and allyl (CH2=CH-CH2-yl).

[0151] Examples of cationic structures represented by general formula (5) include pyrazolium cationic structures and pyrazolinoline cationic structures.

[0152] Specific examples of cations represented by general formula (5) include, for example, pyrazolium cations such as 1-methylpyrazolium cation, 3-methylpyrazolium cation, 1-ethyl-2-methylpyrazolium cation, 1-ethyl-2,3,5-trimethylpyrazolium cation, 1-propyl-2,3,5-trimethylpyrazolium cation, and 1-butyl-2,3,5-trimethylpyrazolium cation; pyrazolium cations such as 1-ethyl-2,3,5-trimethylpyrazolium cation, 1-propyl-2,3,5-trimethylpyrazolium cation, and 1-butyl-2,3,5-trimethylpyrazolium cation; and these cations further include at least one cation selected from vinyl (CH 2=CH-yl) and allyl (CH 2=CH-CH 2-yl).

[0153] Examples of cationic structures represented by general formula (6) include: tetraalkylammonium cationic structure, trialkylsilane cationic structure, tetraalkylphosphonium cationic structure, or those in which one of the alkyl groups is partially replaced by an alkenyl, alkoxy, or epoxy group.

[0154] Specific examples of cations represented by general formula (6) include: tetramethylammonium cation, tetraethylammonium cation, tetrabutylammonium cation, tetrapentylammonium cation, tetrahexylammonium cation, tetraheptylammonium cation, triethylmethylammonium cation, tributylethylammonium cation, trimethylpropylammonium cation, trimethyldecylammonium cation, N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium cation, glycidyltrimethylammonium cation, diallyldimethylammonium cation, N,N-dimethyl-N-ethyl-N-propylammonium cation, N,N-dimethyl-N-ethyl-N-butylammonium cation, N,N-dimethyl-N-ethyl-N-pentyl ...butylammonium cation, N,N-dimethyl-N-ethyl-N-butylammonium cation, N,N-dimethyl-N-ethyl-N-butylammonium cation, N,N-dimethyl-N-ethyl-N-butylammonium cation, N,N-dimethyl-N-ethyl-N-butylammonium cation, N,N-dimethyl-N-ethyl-N N,N-dimethyl-N-ethyl-N-hexylammonium cation, N,N-dimethyl-N-ethyl-N-heptylammonium cation, N,N-dimethyl-N-ethyl-N-nonylammonium cation, N,N-dimethyl-N,N-dipropylammonium cation, N,N-diethyl-N-propyl-N-butylammonium cation, N,N-dimethyl-N-propyl-N-pentylammonium cation, N,N-dimethyl-N-propyl-N-hexylammonium cation, N,N-dimethyl-N-propyl-N-heptylammonium cation, N,N-dimethyl-N-butyl-N-hexylammonium cation, N,N-diethyl-N-butyl-N-heptylammonium cation, N,N-dimethyl-N-pentyl-N-hexylammonium cation, N,N-dimethyl-N-ethyl ... N,N-dihexylammonium cation, trimethylheptylammonium cation, N,N-diethyl-N-methyl-N-propylammonium cation, N,N-diethyl-N-methyl-N-pentylammonium cation, N,N-diethyl-N-methyl-N-heptylammonium cation, N,N-diethyl-N-propyl-N-pentylammonium cation, triethylpropylammonium cation, triethylpentylammonium cation, triethylheptylammonium cation, N,N-dipropyl-N-methyl-N-ethylammonium cation, N,N-dipropyl-N-methyl-N-pentylammonium cation, N,N-dipropyl-N-butyl-N-hexylammonium cation, N,N-dipropyl-N,N-dihexylammonium cation, N,N-dibutyl-N-methyl-N-ethylammonium cation Tetraalkylammonium cations such as N-pentylammonium cation, N,N-dibutyl-N-methyl-N-hexylammonium cation, trioctylmethylammonium cation, N-methyl-N-ethyl-N-propyl-N-pentylammonium cation; trialkylspar cations such as trimethylspar cation, triethylspar cation, tributylspar cation, trihexylspar cation, diethylmethylspar cation, dibutylethylspar cation, dimethyldecylspar cation; tetraalkylspar cations such as tetramethylphosphonium cation, tetraethylspar cation, tetrabutylspar cation, tetrahexylspar cation, tetraoctylspar cation, triethylmethylspar cation, tributylethylspar cation, trimethyldecylspar cation; and tetraalkylspar cations such as tetramethylphosphonium cation, tetraethylspar cation, tetrabutylspar cation, tetrahexylspar cation, tetraoctylspar cation, triethylmethylspar cation, tributylethylspar cation, trimethyldecylspar cation; and these cations further include at least one cation selected from vinyl (CH2=CH-yl) and allyl (CH2=CH-CH2-yl).

[0155] As an ionic compound, it is preferably an ionic compound comprising at least one selected from the above-mentioned onium cations and metal cations and the above-mentioned fluorine organic anions, a silicone oligomer containing an ionic group, more preferably an ionic compound comprising at least one selected from the above-mentioned onium cations and metal cations and the above-mentioned fluorine organic anions, and even more preferably an ionic compound comprising the above-mentioned onium cations and the above-mentioned fluorine organic anions.

[0156] Based on considerations of further demonstrating the effects of the present invention, as an ionic compound, specifically, 1-hexylpyridinium bis(fluorosulfonyl)imidine, 1-ethyl-3-methylpyridinium trifluoromethanesulfonate, 1-ethyl-3-methylpyridinium pentafluoroethanesulfonate, 1-ethyl-3-methylpyridinium heptafluoropropanesulfonic acid, 1-ethyl-3-methylpyridinium nonafluorobutanesulfonate, 1-butyl-3-methylpyridinium trifluoromethanesulfonate, 1-butyl-3-methylpyridinium bis(fluoromethanesulfonyl)imidine, 1-octyl-4-methylpyridinium bis(fluorosulfonyl)imidine, 1-methyl- 1-Propylpyrrolidone-bis(trifluoromethanesulfonyl)imidine, 1-Methyl-1-propylpyrrolidone-bis(fluorosulfonyl)imidine, 1-Methyl-1-propylpiperidone-bis(trifluoromethanesulfonyl)imidine, 1-Methyl-1-propylpiperidone-bis(fluorosulfonyl)imidine, 1-Ethyl-3-methylimidazolium trifluoromethanesulfonate, 1-Ethyl-3-methylimidazolium heptafluoropropanesulfonic acid, 1-Ethyl-3-methylimidazolium-bis(trifluoromethanesulfonyl)imidine, 1-Ethyl-3-methylimidazolium-bis(fluorosulfonyl)imidine, 1-Hexyl-3-methylimidazolium-bis(fluorosulfonyl)imidine, 1 1-Allyl-3-methyl-imidazolium trifluoromethanesulfonate, 1-Allyl-3-methyl-imidazolium heptafluoropropanesulfonic acid, 1-Allyl-3-methyl-imidazolium bis(trifluoromethanesulfonyl)imidide, 1-Allyl-3-methyl-imidazolium bis(fluorosulfonyl)imidide, methyltrioctylammonium bis(trifluoromethanesulfonyl)imidide, trimethylpropylammonium bis(trifluoromethanesulfonyl)imidide, lithium bis(trifluoromethanesulfonyl)imidide, lithium bis(fluorosulfonyl)imidide, and preferably 1-butyl-3-methylpyridinium bis(trifluoromethanesulfonyl)imidide, 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imidide. Lithium bis(trifluoromethanesulfonyl)imine, 1-allyl-3-methyl-imidazolium bis(trifluoromethanesulfonyl)imine, methyltrioctylammonium bis(trifluoromethanesulfonyl)imine, trimethylpropylammonium bis(trifluoromethanesulfonyl)imine, lithium bis(trifluoromethanesulfonyl)imine, preferably 1-butyl-3-methylpyridinium bis(trifluoromethanesulfonyl)imine, 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imine, 1-allyl-3-methyl-imidazolium bis(trifluoromethanesulfonyl)imine, methyltrioctylammonium bis(trifluoromethanesulfonyl)imine, trimethylpropylammonium bis(trifluoromethanesulfonyl)imine.

[0157] Ionic compounds can be commercially available or synthesized by any suitable method. For example, ionic liquids can also be synthesized by the halide method, hydroxide method, ester method, misalignment method, and neutralization method described in "Ionic Liquids - The Frontier and Future of Development -" (published by CMC).

[0158] [Fluorine-based additives] If other components such as fluorine-based additives are included, the surface protective film of the embodiments of the present invention can be further improved in terms of its easy peelability or antistatic properties.

[0159] As a fluorine-based additive, any suitable fluorine-based additive may be used within the scope that does not impair the effect of the present invention.

[0160] Fluorine additives can be one type or two or more types.

[0161] The content of fluorinated additives relative to the total 100 parts by weight of the above-mentioned carbamate prepolymer and polyol is preferably 0.01 parts by weight or more, more preferably 0.03 parts by weight to 30 parts by weight, further preferably 0.05 parts by weight to 10 parts by weight, and even more preferably 0.05 parts by weight to 1 part by weight. More specifically, when the urethane-based adhesive composition is in the state (A) described above, since the urethane-based adhesive composition contains urethane prepolymer and polyol, the content ratio of fluorinated additives is as described above. Furthermore, when the carbamate adhesive composition is in the state described in (B) above, since the carbamate adhesive composition does not contain polyols (i.e., 0 parts by weight), the range of the content ratio of fluorinated additives to 100 parts by weight of carbamate prepolymer is as described above. Furthermore, when the carbamate adhesive composition is in the state described in (C) above, since the carbamate adhesive composition does not contain carbamate prepolymer (i.e., 0 parts by weight), the content ratio of fluorinated additives to 100 parts by weight of polyol is as described above. If the content ratio of fluorine-based additives is within the above range, the surface protective film of the embodiment of the present invention can be further improved in terms of easy peelability or antistatic properties.

[0162] Examples of fluorinated additives include at least one selected from fluorinated compounds, fluorinated compounds containing hydroxyl groups, and fluorinated compounds containing cross-linking functional groups.

[0163] Examples of fluorinated compounds include: compounds with a fluorinated aliphatic hydrocarbon skeleton; fluorinated organic compounds copolymerized from organic compounds and fluorinated compounds; and fluorinated compounds containing organic compounds. Examples of fluorinated aliphatic hydrocarbon skeletons include: fluoromethane, fluoroethane, fluoropropane, fluoroisopropane, fluorobutane, fluoroisobutane, fluoroterbutane, fluoropentane, fluorohexane, and other fluorinated C1-C10 alkanes. Here, the designation "C1-C10" refers to carbon numbers 1-10.

[0164] A preferred embodiment of the fluorinated compound is an oligomer having a fluorinated group, a hydrophilic group, and / or a lipophilic group ("specific fluorinated compound"). By employing such a "specific fluorinated compound", the easy peelability or antistatic properties of the surface protective film of the embodiments of the present invention can be improved. In particular, by using such a "specific fluorinated compound" in combination with an ionic compound, the easy peelability or antistatic properties of the surface protective film of the embodiments of the present invention can be further improved. This is presumably because the ionic compound is concentrated on the surface side (the side that adheres to the adhered object) of the urethane adhesive layer due to the specific fluorinated compound. As a fluorinated group, examples include fluorinated alkyl groups (e.g., CF3-, etc.) and / or fluorinated alkyl groups (e.g., -CF2-, CF2-, etc.). Hydrophilic groups are groups that are hydrophilic in nature. Hydrophilicity, translated as "hydrophilic" in English, means "having an affinity for water," and is a characteristic generally known in the industry (e.g., refer to the McGraw-Hill Dictionary of Scientific and Technical Terminology (Revised 3rd Edition, Nikkan Kogyo Shimbun)). Lipophilic groups are groups that are lipophilic in nature. Lipophilicity, translated as "lipophilic" in English, means "having an affinity for oil," and is a characteristic generally known in the industry (e.g., refer to the McGraw-Hill Dictionary of Scientific and Technical Terminology (Revised 3rd Edition, Nikkan Kogyo Shimbun)).

[0165] As a fluorinated compound, considering the viewpoint that it can further improve the antistatic properties and easy peelability of the surface protective film of the embodiments of the present invention, the surface tension of the 0.1% toluene solution is preferably 19.0 mJ / m² to 28.0 mJ / m², more preferably 19.0 mJ / m² to 26.0 mJ / m² (the surface tension of toluene is 27.9 mN / m). As described above, if the surface tension of the fluorinated compound is within the above range when the 0.1% toluene solution is prepared, the antistatic properties and easy peelability of the surface protective film of the embodiments of the present invention can be further improved.

[0166] Commercially available products containing fluorine compounds include, for example, the following.

[0167] MEGAFAC series manufactured by DIC (stock): Representative examples include: "MEGAFAC F-114", "MEGAFAC F-251", "MEGAFAC F-253", "MEGAFAC F-281", "MEGAFAC F-410", "MEGAFAC F-430", "MEGAFAC F-444", "MEGAFAC F-477", "MEGAFAC F-510", "MEGAFAC F-551-A", "MEGAFAC F-553", "MEGAFAC F-554", "MEGAFAC F-555-A", "MEGAFAC F-556", "MEGAFAC F-557", "MEGAFAC F-558", "MEGAFAC F-559", "MEGAFAC F-560", "MEGAFAC F-561", "MEGAFAC F-562", "MEGAFAC F-563", "MEGAFAC F-565", "MEGAFAC F-568", "MEGAFAC F-569", "MEGAFAC F-570", "MEGAFAC F-576", "MEGAFAC R-01", "MEGAFAC R-40", "MEGAFAC R-40-LM", "MEGAFAC R-41", "MEGAFAC R-41-LM", "MEGAFAC R-94", "MEGAFAC RS-56", "MEGAFAC RS-72-K", "MEGAFAC RS-75-A", "MEGAFAC RS-75-NS", "MEGAFAC RS-78", "MEGAFAC RS-90" etc.

[0168] AGC Ching-Mei Chemical Co., Ltd. manufactures the Surflon series: For example, "S-242", "S-243", and "S-386" are representative examples.

[0169] Sumitomo 3M's FC series: For example, "FC-4430" and "FC-4432" are representative examples.

[0170] NEOS (stock) manufactures the FTERGENT series: For example, some representative examples include: "FTERGENT100", "FTERGENT100C", "FTERGENT110", "FTERGENT150", "FTERGENT150CH", "FTERGENT250", "FTERGENT400SW", etc.

[0171] Kitamura Chemical Industries, Ltd. manufactures PF series products: For representative examples, we can cite: "PF-136A", "PF-156A", "PF-151N", "PF-636", "PF-6320", "PF-656", "PF-6520", "PF-651", "PF-652", "PF-3320", etc.

[0172] As hydroxyl-containing fluorinated compounds, previously known resins can be used, such as those described in International Publication No. 94 / 06870, Japanese Patent Publication No. 8-12921, Japanese Patent Publication No. 10-72569, Japanese Patent Publication No. 4-275379, International Publication No. 97 / 11130, and International Publication No. 96 / 26254. Other hydroxyl-containing fluorinated resins include, for example, fluoroolefin copolymers described in Japanese Patent Publication No. 8-231919, Japanese Patent Publication No. 10-265731, Japanese Patent Publication No. 10-204374, and Japanese Patent Publication No. 8-12922. In addition, examples include: copolymers of hydroxyl-containing compounds containing fluorinated alkyl groups, fluorinated organic compounds copolymerized from hydroxyl-containing compounds and fluorinated compounds, and fluorinated compounds containing hydroxyl-containing organic compounds. Commercially available examples of such hydroxyl-containing fluorinated compounds include: "Lumiflon" (manufactured by Asahi Glass Co., Ltd.), "CEFRAL COAT" (manufactured by Central Glass Co., Ltd.), "ZAFLON" (manufactured by Toa Gosei Co., Ltd.), and "ZEFFLE" (manufactured by Daikin Industries, Ltd.).

[0173] Examples of fluorinated compounds containing crosslinking functional groups include: carboxylic acid compounds with fluorinated alkyl groups, such as perfluorooctanoic acid; copolymers of compounds containing fluorinated alkyl groups; fluorinated organic compounds copolymerized with fluorinated compounds and crosslinking functional groups; and fluorinated compounds containing crosslinking functional groups. Commercially available examples of such fluorinated compounds with crosslinking functional groups include: trade names such as "MEGAFAC F-570", "MEGAFAC RS-55", "MEGAFAC RS-56", "MEGAFAC RS-72-K", "MEGAFAC RS-75", "MEGAFAC RS-76-E", "MEGAFAC RS-76-NS", "MEGAFAC RS-78", and "MEGAFAC RS-90" (manufactured by DIC Corporation).

[0174] Among commercially available fluorinated compounds, those belonging to the category of "oligomers having fluorinated groups, hydrophilic groups, and / or lipophilic groups" can be represented by, for example, those manufactured by DIC (Group) Co., Ltd. "MEGAFAC F-477" (an oligomer containing fluorine-containing, hydrophilic, and lipophilic groups; its surface tension in a 0.1% toluene solution is 26.4 mN / m). "MEGAFAC F-551-A" (an oligomer containing fluorine-containing and lipophilic groups, with a surface tension of 25.6 mN / m when prepared as a 0.1% toluene solution). "MEGAFAC F-553" (an oligomer containing fluorine-containing, hydrophilic, and lipophilic groups; its surface tension in a 0.1% toluene solution is 26.4 mN / m). "MEGAFAC F-554" (an oligomer containing fluorine-containing and lipophilic groups, with a surface tension of 25.0 mN / m when prepared as a 0.1% toluene solution). "MEGAFAC F-555-A" (an oligomer containing fluorine-containing, hydrophilic, and lipophilic groups; its surface tension in a 0.1% toluene solution is 20.4 mN / m). "MEGAFAC F-557" (an oligomer containing fluorine-containing, hydrophilic, and lipophilic groups; its surface tension in a 0.1% toluene solution is 26.3 mN / m). "MEGAFAC F-559" (an oligomer containing fluorine-containing, hydrophilic, and lipophilic groups; its surface tension in a 0.1% toluene solution is 26.1 mN / m). "MEGAFAC F-563" (an oligomer containing fluorine-containing and lipophilic groups, with a surface tension of 20.2 mN / m when prepared as a 0.1% toluene solution). "MEGAFAC F-569" (an oligomer containing fluorine-containing and hydrophilic groups, with a surface tension of 19.7 mN / m when prepared as a 0.1% toluene solution), etc.

[0175] [Silicone-based additives] If other components such as silicone-based additives are included, the easy peelability of the surface protective film in the embodiments of the present invention can be further improved.

[0176] As a silicone-based additive, any suitable silicone-based additive may be used within the scope that does not impair the effect of the present invention.

[0177] Silicone additives can be one type or two or more types.

[0178] The content of the silicone additive relative to the total 100 parts by weight of the above-mentioned carbamate prepolymer and polyol is preferably 0.01 parts by weight or more, more preferably 0.015 parts by weight to 30 parts by weight, further preferably 0.020 parts by weight to 10 parts by weight, and even more preferably 0.025 parts by weight to 1 part by weight. More specifically, when the urethane-based adhesive composition is in the state (A) described above, since the urethane-based adhesive composition contains urethane prepolymer and polyol, the content ratio of silicone additives is as described above. Furthermore, when the carbamate adhesive composition is in the state described in (B) above, since the carbamate adhesive composition does not contain polyols (i.e., 0 parts by weight), the range of the content ratio of silicone additives to 100 parts by weight of carbamate prepolymer is as described above. Furthermore, when the carbamate-based adhesive composition is in the state described in (C) above, since the carbamate-based adhesive composition does not contain carbamate prepolymer (i.e., 0 parts by weight), the content ratio of silicone additive to 100 parts by weight of polyol is as described above. If the content ratio of silicone-based additives is within the above range, the easy peelability of the surface protective film in the embodiments of the present invention can be further improved.

[0179] Based on considerations that can further demonstrate the effects of the present invention, the total amount of the above-mentioned fluorinated additives and silicone additives relative to the total 100 parts by weight of the above-mentioned carbamate prepolymer and polyol is 0.01 parts by weight or more, more preferably 0.03 parts by weight to 30 parts by weight, further preferably 0.05 parts by weight to 10 parts by weight, and even more preferably 0.05 parts by weight to 1 part by weight. More specifically, when the urethane-based adhesive composition is in the state (A) described above, since the urethane-based adhesive composition contains urethane prepolymer and polyol, the total content ratio of fluorinated additives and silicone additives is as described above. Furthermore, when the carbamate adhesive composition is in the state described in (B) above, since the carbamate adhesive composition does not contain polyols (i.e., 0 parts by weight), the range of the total amount of fluorinated additives and silicone additives relative to 100 parts by weight of carbamate prepolymer is as described above. Furthermore, when the carbamate adhesive composition is in the state (C) described above, since the carbamate adhesive composition does not contain carbamate prepolymer (i.e., 0 parts by weight), the content ratio of fluorinated additives and silicone additives to 100 parts by weight of polyol is as described above.

[0180] Any suitable silicone additive may be used within the scope of not impairing the effects of the present invention. Examples of such silicone additives include reactive silicone oils and non-reactive silicone oils.

[0181] Examples of reactive silicone oils include: side-chain reactive silicone oils with organic groups bonded as side chains to the Si atoms of the siloxane bonds; two-terminal reactive silicone oils with organic groups bonded to the Si atoms at both ends of the structure; single-terminal reactive silicone oils with organic groups bonded only to one Si atom at one end of the structure; and two-terminal reactive silicone oils with organic groups bonded as side chains to both the Si atoms of the siloxane bonds and the Si atoms at both ends of the structure.

[0182] Examples of side-chain reactive silicone oils include: amino-modified side-chain reactive silicone oils, epoxy-modified side-chain reactive silicone oils, methanol-modified side-chain reactive silicone oils, mercapto-modified side-chain reactive silicone oils, carboxyl-modified side-chain reactive silicone oils, and methylhydrosilicone oil-type side-chain reactive silicone oils. Commercially available examples include various silicone oils manufactured by Shin-Etsu Chemical Co., Ltd. that are commercially available as side-chain reactive silicone oils.

[0183] Examples of two-terminated reactive silicone oils include: amino-modified two-terminated reactive silicone oils, epoxy-modified two-terminated reactive silicone oils, methanol-modified two-terminated reactive silicone oils, methacrylic acid-modified two-terminated reactive silicone oils, polyether-modified two-terminated reactive silicone oils, mercapto-modified two-terminated reactive silicone oils, carboxyl-modified two-terminated reactive silicone oils, phenol-modified two-terminated reactive silicone oils, silanol-terminated two-terminated reactive silicone oils, acrylic acid-modified two-terminated reactive silicone oils, and carboxylic anhydride-modified two-terminated reactive silicone oils. Commercially available examples of these include various silicone oils manufactured by Shin-Etsu Chemical Co., Ltd. that are commercially available as two-terminated reactive silicone oils. In particular, methanol-modified two-terminal reactive silicone oils such as "KF-6000", "KF-6001", "KF-6002", "KF-6003" and "KF-6028" manufactured by Shin-Etsu Chemical Co., Ltd. can be used more effectively.

[0184] Examples of single-terminal reactive silicone oils include: single-terminal reactive modified single-terminal reactive silicone oils and average single-terminal carboxyl modified single-terminal reactive silicone oils. Commercially available examples include various single-terminal reactive silicone oils manufactured by Shin-Etsu Chemical Industry Co., Ltd. In particular, methanol-modified single-terminal reactive silicone oils such as "X-22-170BX", "X-22-170DX", and "X-22-4015" manufactured by Shin-Etsu Chemical Industry Co., Ltd. are particularly suitable.

[0185] Examples of reactive silicone oils with two-terminal side chains include: reactive silicone oils modified with amino groups and methoxy groups at both ends of the side chain, and reactive silicone oils modified with epoxy groups at both ends of the side chain. Commercially available examples of such products include various silicone oils manufactured by Shin-Etsu Chemical Co., Ltd. that are reactive silicone oils with two-terminal side chains.

[0186] Examples of non-reactive silicone oils include: side-chain type non-reactive silicone oils with organic groups bonded as side chains to the Si atoms of the siloxane bond, and two-terminal type non-reactive silicone oils with organic groups bonded to the Si atoms at both ends of the structure.

[0187] Examples of side-chain type non-reactive silicone oils include: polyether-modified side-chain type non-reactive silicone oils, aralkyl-modified side-chain type non-reactive silicone oils, fluoroalkyl-modified side-chain type non-reactive silicone oils, long-chain alkyl-modified side-chain type non-reactive silicone oils, higher fatty acid ester-modified side-chain type non-reactive silicone oils, higher fatty acid-containing side-chain type non-reactive silicone oils, and phenyl-modified side-chain type non-reactive silicone oils. Commercially available examples of these include various silicone oils manufactured by Shin-Etsu Chemical Co., Ltd., which are commercially available as side-chain type non-reactive silicone oils. In particular, polyether-modified side-chain non-reactive silicone oils manufactured by Shin-Etsu Chemical Industry Co., Ltd., such as "KF-351A", "KF-352A", "KF-353", "KF-354L", "KF-355A", "KF-615A", "KF-945", "KF-640", "KF-642", "KF-643", "KF-644", "KF-6020", "KF-6204", and "X-22-4515", are preferred.

[0188] Among these polyether-modified side-chain non-reactive silicone oils, those with an HLB value of 3 or higher, more preferably 8 or higher, further preferably 9 or higher, and especially preferably 10 or higher are preferred, based on the consideration of further reducing paste residue. Examples of such polyether-modified side-chain non-reactive silicone oils include: "KF-351A" (HLB=12), "KF-353" (HLB=10), "KF-354L" (HLB=16), "KF-355A" (HLB=12), "KF-615A" (HLB=10), "KF-640" (HLB=14), "KF-642" (HLB=12), "KF-643" (HLB=14), "KF-644" (HLB=11), and "KF-6204" (HLB=10).

[0189] Examples of two-terminal non-reactive silicone oils include, for example, polyether-modified two-terminal non-reactive silicone oils. Commercially available examples include various silicone oils manufactured by Shin-Etsu Chemical Co., Ltd., which are commercially available as two-terminal non-reactive silicone oils. In particular, polyether-modified two-terminal non-reactive silicone oils such as "KF-6004" manufactured by Shin-Etsu Chemical Co., Ltd. are particularly suitable.

[0190] In addition to the above, any suitable silicone additive previously known may be used as a silicone additive. Examples of such silicone additives include: polymers containing siloxane bonds other than those mentioned above, silicone compounds containing hydroxyl groups other than those mentioned above, and silicone compounds containing crosslinking functional groups other than those mentioned above.

[0191] Commercially available products containing siloxane bonds, other than those mentioned above, include: "LE-302" (manufactured by Kyoesha Chemical Co., Ltd.), and BYK series leveling agents manufactured by BYK-Chemie Japan ("BYK-300", "BYK-301 / 302", "BYK-306", "BYK-307", "BYK-310", "BYK-315", "BYK-313", "BYK-320", "BYK-322", "BYK-323", "BYK-325", "BYK-330", "BYK-331", "BYK-333", "BYK-337", "BYK-341", "BYK-302 ... YK-344", "BYK-345 / 346", "BYK-347", "BYK-348", "BYK-349", "BYK-370", "BYK-375", "BYK-377", "BYK-378", " BYK-UV3500", "BYK-UV3510", "BYK-UV3570", "BYK-3550", "BYK-SILCLEAN3700", "BYK-SILCLEAN3720", etc.), Algin AC series leveling agents manufactured by Chemie Company ("AC FS180", "AC FS360", "AC S20, etc.), Polyflow series leveling agents manufactured by Kyoei Chemical Co., Ltd. (PolyflowKL-400X, PolyflowKL-400HF, PolyflowKL-401, PolyflowKL-402, PolyflowKL-403, PolyflowKL-404, etc.), and KP series leveling agents manufactured by Shin-Etsu Chemical Industry Co., Ltd. (KP-323, KP-326, KP, etc.). -341, KP-104, KP-110, KP-112, etc.), and leveling agents manufactured by Toray Dow Corning (LP-7001, LP-7002, 8032ADDITIVE, 57ADDITIVE, L-7604, FZ-2110, FZ-2105, 67ADDITIVE, 8618ADDITIVE, 3ADDITIVE, 56ADDITIVE, etc.).

[0192] Other commercially available silicone products containing hydroxyl groups besides those mentioned above include, for example, "BYK-370", "BYK-SILCLEAN3700", and "BYK-SILCLEAN3720" manufactured by BYK-Chemie Japan.

[0193] Commercially available silicone compounds containing cross-linking functional groups, other than those mentioned above, include, for example, "BY16-855", "SF8413", "BY16-839", "SF8421", "BY16-750", "BY16-880", and "BY16-152C" manufactured by Toray Dow Corning.

[0194] [Antioxidants] Considering factors such as inhibiting the degradation of carbamate adhesive layers, carbamate adhesive compositions may also include antioxidants as other components. There may be only one type of antioxidant, or there may be two or more types.

[0195] The antioxidant content in the carbamate-based adhesive composition can be any suitable ratio within the range that does not impair the effects of the present invention. This ratio, calculated as the antioxidant relative to 100 parts by weight of the total carbamate prepolymer and polyol, is preferably 0.01 parts by weight to 10 parts by weight or more, more preferably 0.05 parts by weight to 5 parts by weight, further preferably 0.1 parts by weight to 3 parts by weight, and even more preferably 0.2 parts by weight to 1 part by weight. More specifically, when the carbamate adhesive composition is in the state (A) described above, since the carbamate adhesive composition contains carbamate prepolymer and polyol, the antioxidant content ratio is as described above. Furthermore, when the carbamate adhesive composition is in the state described in (B) above, since the carbamate adhesive composition does not contain polyols (i.e., 0 parts by weight), the range of the antioxidant content relative to 100 parts by weight of the carbamate prepolymer is as described above. Furthermore, when the carbamate adhesive composition is in the state described in (C) above, since the carbamate adhesive composition does not contain carbamate prepolymer (i.e., 0 parts by weight), the content ratio of antioxidant to 100 parts by weight of polyol is as described above.

[0196] Examples of antioxidants include free radical chain inhibitors and peroxide decomposers.

[0197] Examples of free radical chain inhibitors include phenolic antioxidants and amine antioxidants.

[0198] Examples of peroxide decomposing agents include sulfur-based antioxidants and phosphorus-based antioxidants.

[0199] Examples of phenolic antioxidants include monophenolic antioxidants, bisphenolic antioxidants, and high molecular weight phenolic antioxidants.

[0200] Examples of monophenolic antioxidants include: 2,6-di-tert-butyl-p-cresol, butylated hydroxymethoxybenzene, 2,6-di-tert-butyl-4-ethylphenol, and stearate β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate.

[0201] Examples of bisphenol-based antioxidants include: 2,2'-methylenebis(4-methyl-6-tert-butylphenol), 2,2'-methylenebis(4-ethyl-6-tert-butylphenol), 4,4'-thiobis(3-methyl-6-tert-butylphenol), 4,4'-butylenebis(3-methyl-6-tert-butylphenol), and 3,9-bis[1,1-dimethyl-2-[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propoxy]ethyl]2,4,8,10-tetraoxaspiro[5,5]undecane.

[0202] Examples of high molecular weight phenolic antioxidants include: 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, tetra-[methylene-3-(3',5'-di-tert-butyl-4'-hydroxyphenyl)propionate]methane, bis[3,3'-bis-(4'-hydroxy-3'-tert-butylphenyl)butyrate]diol ester, 1,3,5-tris(3',5'-di-tert-butyl-4'-hydroxybenzyl)-symmetric trisodium-2,4,6-(1H,3H,5H)trione, and tocopherol.

[0203] Examples of sulfur-based antioxidants include dilaurate 3,3'-thiodipropionate, dimyristyl 3,3'-thiodipropionate, and distearate 3,3'-thiodipropionate.

[0204] Examples of phosphorus-based antioxidants include: triphenyl phosphite, diphenyl isodecyl phosphite, and phenyl diisodecyl phosphite.

[0205] [UV absorber] Considering factors such as inhibiting the degradation of carbamate adhesive layers, carbamate adhesive compositions may also contain ultraviolet absorbers as other components. There may be only one type of ultraviolet absorber, or there may be two or more types.

[0206] The content ratio of the ultraviolet absorber in the carbamate-based adhesive composition can be any suitable ratio within the range that does not impair the effect of the present invention. Such a content ratio, calculated as the content ratio of the ultraviolet absorber relative to 100 parts by weight of the above-mentioned carbamate prepolymer and polyol, is preferably 0.01 parts by weight to 10 parts by weight or more, more preferably 0.05 parts by weight to 5 parts by weight, further preferably 0.1 parts by weight to 3 parts by weight, and even more preferably 0.2 parts by weight to 1 part by weight. More specifically, when the urethane-based adhesive composition is in the state (A) described above, since the urethane-based adhesive composition contains urethane prepolymer and polyol, the content ratio of ultraviolet absorber is as described above. Furthermore, when the carbamate adhesive composition is in the state described in (B) above, since the carbamate adhesive composition does not contain polyols (i.e., 0 parts by weight), the range of the content ratio of the ultraviolet absorber to 100 parts by weight of the carbamate prepolymer is as described above. Furthermore, when the carbamate adhesive composition is in the state described in (C) above, since the carbamate adhesive composition does not contain carbamate prepolymer (i.e., 0 parts by weight), the content ratio of ultraviolet absorber to 100 parts by weight of polyol is as described above.

[0207] Examples of UV absorbers include: benzophenone-based UV absorbers, benzotriazole-based UV absorbers, salicylic acid-based UV absorbers, oxaliplatin-based UV absorbers, cyanoacrylate-based UV absorbers, and trichloroisocyanuric acid-based UV absorbers.

[0208] Examples of benzophenone-based ultraviolet absorbers include: 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone, 2,2'-dihydroxy-4-dimethoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone, and bis(2-methoxy-4-hydroxy-5-benzoylphenyl)methane.

[0209] Examples of benzotriazole-based ultraviolet absorbers include: 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-5'-tert-butylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)benzotriazole, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3', 5'-Di-terpentylphenyl)benzotriazole, 2-(2'-hydroxy-4'-octoxyphenyl)benzotriazole, 2-[2'-hydroxy-3'-(3'',4'',5'',6'',-tetrahydrophthaliminomethyl)-5'-methylphenyl]benzotriazole, 2,2'-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-(2H-benzotriazole-2-yl)phenol], [2(2'-hydroxy-5'-methacrylic acetylated phenyl)-2H-benzotriazole].

[0210] Examples of salicylic acid-based ultraviolet absorbers include: phenyl salicylate, p-tert-butylphenyl salicylate, and p-octylphenyl salicylate.

[0211] Examples of cyanoacrylate-based ultraviolet absorbers include 2-ethylhexyl 2-cyano-3,3'-diphenylacrylate and ethyl 2-cyano-3,3'-diphenylacrylate.

[0212] [Light stabilizer] Considering factors such as inhibiting the degradation of carbamate adhesive layers, carbamate adhesive compositions may also include light stabilizers as other components. There may be only one type of light stabilizer, or there may be two or more types.

[0213] The content ratio of the light stabilizer in the carbamate-based adhesive composition can be any suitable ratio within the range that does not impair the effect of the present invention. Such a content ratio, calculated as the ratio of the light stabilizer to 100 parts by weight of the total carbamate prepolymer and polyol, is preferably 0.01 parts by weight to 10 parts by weight or more, more preferably 0.05 parts by weight to 5 parts by weight, further preferably 0.1 parts by weight to 3 parts by weight, and even more preferably 0.2 parts by weight to 1 part by weight. More specifically, when the urethane adhesive composition is in the state (A) described above, since the urethane adhesive composition contains urethane prepolymer and polyol, the content ratio of light stabilizer is as described above. Furthermore, when the carbamate adhesive composition is in the state described in (B) above, since the carbamate adhesive composition does not contain polyols (i.e., 0 parts by weight), the range of the content ratio of light stabilizer to 100 parts by weight of carbamate prepolymer is as described above. Furthermore, when the carbamate adhesive composition is in the state described in (C) above, since the carbamate adhesive composition does not contain carbamate prepolymer (i.e., 0 parts by weight), the content ratio of light stabilizer to 100 parts by weight of polyol is as described above.

[0214] Examples of light stabilizers include hindered amine light stabilizers and ultraviolet stabilizers.

[0215] Examples of hindered amine light stabilizers include: bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, and methyl 1,2,2,6,6-pentamethyl-4-piperidinyl sebacate.

[0216] Examples of UV stabilizers include: nickel bis(octylphenyl) sulfide, nickel [2,2'-thiobis(4-tert-octylphenol)]-n-butylamine, nickel complex-3,5-di-tert-butyl-4-hydroxybenzyl-phosphate monoethanolate, nickel dibutyldithiocarbamate, benzoate-type inhibitors, and nickel dibutyldithiocarbamate.

[0217] [Fatty acid esters] Considering factors such as improved wettability of carbamate-based adhesive layers, carbamate-based adhesive compositions may also include fatty acid esters as other components. There may be only one type of fatty acid ester, or there may be two or more types.

[0218] The number average molecular weight (Mn) of the fatty acid ester is preferably 200-400, more preferably 210-395, further preferably 230-380, especially preferably 240-360, and most preferably 250-350. Adjusting the number average molecular weight (Mn) of the fatty acid ester to within the above range can further improve the wetting speed. If the number average molecular weight (Mn) of the fatty acid ester is too small, there is a risk that even with a larger addition amount, the wetting speed will not improve. If the number average molecular weight (Mn) of the fatty acid ester is too large, the hardening properties of the adhesive during drying will deteriorate, which will not only adversely affect the wetting properties but also other adhesive properties.

[0219] As a fatty acid ester, any suitable fatty acid ester may be used within the scope of not impairing the effects of the present invention. Examples of such fatty acid esters include: polyoxyethylene bisphenol A laurate, butyl stearate, 2-ethylhexyl palmitate, 2-ethylhexyl stearate, glyceryl benzyl acid monoester, cetyl 2-ethylhexanoate, isopropyl myristate, isopropyl palmitate, cholesterol isostearate, lauryl methacrylate, coconut fatty acid methyl ester, methyl laurate, methyl oleate, methyl stearate, myristyl myristate, octyl dodecyl myristate, pentaerythritol monooleate, pentaerythritol monostearate, pentaerythritol tetrapalmitate, stearate, isotridecyl stearate, triglyceride 2-ethylhexanoate, butyl laurate, and octyl oleate.

[0220] ≪1-3. Substrate Layer≫ The thickness of the substrate layer can be any appropriate thickness depending on the application. The thickness of the substrate layer is preferably 5 μm to 300 μm, more preferably 10 μm to 250 μm, even more preferably 15 μm to 200 μm, and even more preferably 20 μm to 150 μm.

[0221] The substrate layer can be a single layer or a laminate of two or more layers. The substrate layer can also be an extended layer.

[0222] The substrate layer can be made of any suitable material, depending on the application. Examples include: plastic, paper, metal film, non-woven fabric, etc. Plastic is preferred. The substrate layer can be composed of one material or two or more materials. For example, it can be composed of two or more types of plastic.

[0223] Examples of the aforementioned plastics include: polyester resins, polyamide resins, and polyolefin resins. Examples of polyester resins include: polyethylene terephthalate, polyethylene terephthalate, and polyethylene naphthalate. Examples of polyolefin resins include: homopolymers of olefin monomers and copolymers of olefin monomers. Specifically, examples of polyolefin resins include: homopolymer polypropylene; block copolymers, random copolymers, and graft copolymers of propylene with ethylene as a copolymer component; reactor TPO; low-density, high-density, linear low-density, and ultra-low-density ethylene polymers; and ethylene-propylene copolymers, ethylene-vinyl acetate copolymers, ethylene-methyl acrylate copolymers, ethylene-ethyl acrylate copolymers, ethylene-butyl acrylate copolymers, ethylene-methacrylic acid copolymers, and ethylene-methyl methacrylate copolymers.

[0224] The substrate layer may contain any suitable additives as needed. Examples of additives that may be included in the substrate layer include: antioxidants, UV absorbers, light stabilizers, antistatic agents, fillers, and pigments. The type, quantity, and amount of additives that may be included in the substrate layer can be appropriately determined according to the purpose. Especially when the substrate layer material is plastic, it is preferable to include some of the above-mentioned additives for purposes such as preventing degradation. From the perspective of improving weather resistance, antioxidants, UV absorbers, light stabilizers, and fillers are particularly preferred additives.

[0225] Any suitable antioxidant can be used. Examples of such antioxidants include phenolic antioxidants, phosphorus-based processing heat stabilizers, lactone-based processing heat stabilizers, sulfur-based heat stabilizers, and phenol / phosphorus-based antioxidants. Regarding the antioxidant content ratio, relative to the base resin of the substrate layer (where the substrate layer is an admixture, the admixture is the base resin), it is preferably 1% by weight or less, more preferably 0.5% by weight or less, and even more preferably 0.01% to 0.2% by weight.

[0226] Any suitable ultraviolet absorber can be used as the ultraviolet absorber. Examples of such ultraviolet absorbers include benzotriazole-based ultraviolet absorbers, triazole-based ultraviolet absorbers, and benzophenone-based ultraviolet absorbers. Regarding the content ratio of the ultraviolet absorber, it is preferably 2% by weight or less, more preferably 1% by weight or less, and even more preferably 0.01% to 0.5% by weight, relative to the base resin forming the substrate layer (if the substrate layer is an admixture, the admixture is the base resin).

[0227] Any suitable light stabilizer can be used. Examples of such light stabilizers include hindered amine light stabilizers and benzoic acid ester light stabilizers. Regarding the content ratio of the light stabilizer, it is preferably 2% by weight or less, more preferably 1% by weight or less, and even more preferably 0.01% to 0.5% by weight, relative to the base resin forming the substrate layer (if the substrate layer is an admixture, the admixture is the base resin).

[0228] Any suitable filler can be used. Examples of such fillers include inorganic fillers. Specifically, examples of inorganic fillers include carbon black, titanium dioxide, and zinc oxide. Regarding the filler content ratio, relative to the base resin forming the substrate layer (if the substrate layer is an admixture, the admixture is the base resin), it is preferably 20% by weight or less, more preferably 10% by weight or less, and even more preferably 0.01% by weight to 10% by weight.

[0229] Furthermore, as additives for imparting antistatic properties, good examples include inorganic substances such as surfactants, inorganic salts, polyols, metal compounds, and carbon; as well as low-molecular-weight and high-molecular-weight antistatic agents. In particular, from the perspective of maintaining contamination and adhesion, high-molecular-weight antistatic agents or carbon are preferred.

[0230] ≪≪2. Manufacturing Method of Surface Protective Film≫≫ The surface protective film of this invention can be manufactured by any suitable method. For example, such a manufacturing method can be carried out according to any suitable manufacturing method as follows: (1) A method of applying a solution or hot melt liquid of an adhesive layer forming material onto a substrate layer. (2) A method for transferring and adhering an adhesive layer coated thereon and formed into a release film onto a substrate layer. (3) A method of forming a coating by extruding the adhesive layer forming material onto the substrate layer. (4) The substrate layer and adhesive layer are extruded in two or more layers. (5) A method of laminating an adhesive layer onto a substrate layer as a single layer or a method of laminating an adhesive layer and a laminate layer together as a double layer. (6) A method of laminating an adhesive layer with a substrate layer such as a film or laminate layer in two or more layers.

[0231] Coating methods include, for example, roller coating, corner wheel coating, die coating, reverse coating, screen printing, and gravure coating.

[0232] ≪≪3. Uses of Surface Protective Film≫≫ The surface protective film of the present invention can be used for any suitable application. Because the surface protective film of the present invention possesses a urethane-based adhesive layer with excellent surface elastic modulus, it is preferably used for surface protection of optical or electronic components. Examples of optical components include: LCDs (liquid crystal displays), touch panels using LCDs, color filters used in LCDs, polarizing plates, etc.

[0233] The components, such as optical components or electronic components, to which the surface protective film of the present invention is applied can be applied and peeled off multiple times by manual operation.

[0234] That is, the optical components of the embodiments of the present invention are coated with the surface protective film of the present invention. Also, the electronic components of the embodiments of the present invention are coated with the surface protective film of the present invention. [Example]

[0235] The present invention will now be specifically described through examples, but the present invention is not limited to these examples in any way. Furthermore, the testing and evaluation methods in the examples are as follows. Also, when referred to as "parts," unless otherwise specified, it means "parts by weight," and when referred to as "%," unless otherwise specified, it means "% by weight."

[0236] <Regarding the adhesive force of glass> Using a 2 kg hand roller, the protective film (25 mm wide × 140 mm long) with the release liner removed was adhered to the glass (soda-lime glass, manufactured by Matsunami Glass Industry Co., Ltd.). It was then placed at an ambient temperature of 23°C for 30 minutes. The obtained evaluation specimens were then tested using a tensile testing machine. The tensile testing machine used was the "Automatic Stereograph AG-Xplus HS 6000 mm / min High-Speed ​​Model (AG-50NX plus)" manufactured by Shimadzu Corporation. The evaluation specimens were placed in the tensile testing machine, and the tensile test was started. The tensile test conditions were set as peel angle = 180 degrees and peel speed (tensile speed) = 300 mm / min. The load at which the protective film was peeled from the glass was measured, and the average load at this point was defined as the adhesion force (peel force) of the protective film to the glass.

[0237] <Regarding the residual adhesion rate of glass> The protective film was applied to a glass plate (Matsunami Glass, 1.35 mm × 10 cm × 10 cm) using a hand roller. After 24 hours of storage at 23°C and 55%RH, the protective film was peeled off at a peel angle of 180 degrees and a speed of 0.3 m / min. Then, at 23°C and 55%RH, a 150 mm long and 19 mm wide strip of No. 31B tape (Nitto Denko, 25 μm substrate thickness) was applied by rolling a 2.0 kg roller back and forth once. After curing for 30 minutes at 23°C and 55%RH, the adhesive strength was measured using a tensile testing machine (Shimadzu Corporation, trade name "Automatic Stereograph AG-Xplus HS 6000 mm / min High-Speed ​​Model (AG-50NX plus)") at a peel angle of 180 degrees and a tensile speed of 300 mm / min. In addition, for glass plates that have not undergone the treatment described above, the adhesive force of No. 31B tape with a width of 19 mm was measured in the same manner, and the residual adhesion rate was calculated using the following formula. Residual adhesion rate (%) = (Adhesion of No. 31B to the glass plate after the surface protective film has been peeled off / Adhesion of No. 31B to the glass plate) × 100 The residual adhesion rate is an indicator of the extent to which the adhesive components of the surface protective film transfer and contaminate the surface of the adherend. A higher residual adhesion rate indicates less contamination of the adherend, making it a better surface protective film. Conversely, a lower residual adhesion rate indicates that the surface of the adherend is more contaminated by adhesive components.

[0238] <Glass peel electrostatic resistance> The protective film, after the release liner has been peeled off, was cut into pieces 70 mm wide and 100 mm long, and pressed onto the surface of glass (soda-lime glass, manufactured by Matsunaga Glass Industry Co., Ltd.) using a hand roller, so that one end of the protective film extends 30 mm from the end of the substrate. After placing the sample at 23°C and 50%RH for one day, it was placed at a specific position on a sample holder 20 mm high. The end of the protective film extending 30 mm from the substrate was fixed to an automatic winding machine (not shown), and peeling was performed at a peel angle of 150° and a peel speed of 30 m / min. The potential generated on the surface of the substrate was measured using a potentiometer (manufactured by SHISHIDO ELECTROSTATIC, model "STATIRON DZ-4") fixed at a height of 30 mm from the center of the substrate to determine the "peel electrostatic voltage". The measurement was performed at 23°C and 50%RH.

[0239] <Haze> A urethane-based adhesive composition was coated and dried on the release-treated side of a 75 μm thick polyester film (trade name: DIAFOIL MRF75, manufactured by Mitsubishi Chemical Co., Ltd.) that had undergone silicone release treatment on one side, under the conditions of the examples and comparative examples, to form a urethane-based adhesive layer. Subsequently, a 75 μm thick polyester film (trade name: DIAFOIL MRE75, manufactured by Mitsubishi Chemical Co., Ltd.) with its release-treated side becoming the urethane-based adhesive layer side was coated onto the surface of the urethane-based adhesive layer, and aged at room temperature for 5 days. Prepare two pieces of 50 mm × 50 mm thick paper with a 20 mm × 20 mm hole in the center. Use a hand roller to press one piece back and forth once to adhere it to the sample body, and then adhere the other piece. The haze of the evaluation samples obtained in the above manner was measured using the "HM-150N" manufactured by Murakami Color Technology Research Institute Co., Ltd.

[0240] <Surface elastic modulus of adhesive layer> The protective film, after the release liner has been peeled off, was cut into 10 mm square pieces and fixed on the sample stage. The elastic modulus (MPa) of the adhesive surface was measured using a Hysitron Inc. nanoindenter "TI950 TriboIndenter / Conical indenter with a 10 μm radius of curvature". The measurement conditions are as follows. • Measurement mode: Single indentation test • Duration of holding position when maximum displacement is reached: 0 seconds • Push-in / pull-out depth velocity: 500 nm / sec • Indentation depth: 5 μm • Measurement environment: 23℃, 50%RH

[0241] [Manufacturing Example 1]: Manufacturing of urethane prepolymer solution A In a polymerization apparatus equipped with a 1 L round-bottom separable flask, a separable cap, a separatory funnel, a thermometer, a nitrogen inlet tube, a Liebig condenser, a vacuum seal, a stir bar, and a stir blade, 333 g of poly(1,4-butanediol) (product name "PTMG3000", manufactured by Mitsubishi Chemical Co., Ltd.), 83 g of polypropylene glycol (product name "SANNIX GP-1500", manufactured by Sanyo Chemical Co., Ltd.), and 110 g of ethyl acetate (manufactured by Tosoh Co., Ltd.) as solvent were added. While stirring, 0.041 g of dibutyltin dilaurate (IV) (manufactured by Wako Pure Chemical Industries Co., Ltd.) as catalyst was added, and nitrogen purging was carried out at room temperature for 1 hour. Subsequently, under nitrogen flow, 13.0 g of hexamethylene diisocyanate (a polyfunctional isocyanate compound, product name "HDI", manufactured by Tosoh Corporation) was added while stirring. The solution temperature in the experimental apparatus was controlled to reach 90±2°C using a water bath and maintained for 4 hours to obtain carbamate prepolymer solution A. Furthermore, during polymerization, ethyl acetate was added dropwise as needed to control the polymerization temperature and prevent a decrease in stirability due to increased viscosity. The total amount of ethyl acetate added was 320 g. The solid content concentration of carbamate prepolymer solution A was 50% by weight. Carbamate prepolymer A was used in the examples.

[0242] [Manufacturing Example 2]: Manufacturing of urethane prepolymer solution B In a polymerization experimental apparatus equipped with a 1 L round-bottom separable flask, a separable cap, a separatory funnel, a thermometer, a nitrogen inlet tube, a Liebig condenser, a vacuum seal, a stirring rod, and stirring blades, 197 g of polypropylene glycol (product name "SANNIX PP-2000", manufactured by Sanyo Chemical Co., Ltd.), 197 g of polyester polyol (product name "KURARAY POLYOL P-2010", manufactured by Kuraray Co., Ltd.), 110 g of toluene (manufactured by Tosoh Co., Ltd.) as solvent, and 0.041 g of dibutyltin dilaurate (IV) (manufactured by Wako Pure Chemical Industries Co., Ltd.) as catalyst were added, and nitrogen purging was carried out at room temperature for 1 hour while stirring. Subsequently, under nitrogen inflow, 33.5 g of hexamethylene diisocyanate (a polyfunctional isocyanate compound, product name "HDI", manufactured by Tosoh Corporation) was added while stirring. The solution temperature in the experimental apparatus was controlled to reach 90±2℃ using a water bath and maintained for 4 hours. Then, 44 g of polypropylene glycol (product name "GP1000", manufactured by Sanyo Chemical Industries, Ltd.) was added. The solution temperature in the experimental apparatus was controlled to reach 90±2℃ using a water bath and maintained for 2 hours. Finally, 25.4 g of hexamethylene diisocyanate (product name "HDI", manufactured by Tosoh Corporation) was added. The solution temperature in the experimental apparatus was controlled to reach 90±2℃ using a water bath and maintained for 2 hours, thus obtaining urethane prepolymer solution B. Furthermore, during polymerization, toluene was added dropwise as needed to control the polymerization temperature and prevent a decrease in stirability due to increased viscosity. The total amount of toluene added was 380 g. The solid content concentration of urethane prepolymer solution B was 50% by weight. The carbamate prepolymer B was used in the examples and comparative examples.

[0243] [Example 1] A carbamate prepolymer A was diluted with ethyl acetate to achieve a total solid content of 50% by weight. 100 parts by weight of the carbamate prepolymer A, 3.2 parts by weight of the polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.) as a crosslinking agent, 0.5 parts by weight of the antioxidant Irganox 1010 (manufactured by BASF Co., Ltd.), and 0.03 parts by weight of the catalyst triacetylacetonate iron (manufactured by Nippon Chemical Industry Co., Ltd.) were then obtained. The carbamate adhesive solution was then coated with the carbamate adhesive solution to a thickness of 75 μm after drying onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.), cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate adhesive (1). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (1). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 1.

[0244] [Example 2] A carbamate prepolymer A (95 parts by weight); PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000) (3.5 parts by weight), a polyol with three hydroxyl groups (1.5 parts by weight), SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000) (1.5 parts by weight), a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.) (3.8 parts by weight), a crosslinking agent; Irganox 1010 (manufactured by BASF Co., Ltd.) (0.5 parts by weight), an antioxidant; and triacetylacetonate iron (manufactured by Nippon Chemical Industry Co., Ltd.) (0.03 parts by weight), a catalyst, were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, a carbamate-based adhesive solution was coated onto a polyester resin-containing substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The substrate was cured and dried at 130°C for 3 minutes to create an adhesive layer containing carbamate-based adhesive (2). Next, a silicone-treated release sheet (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) with a thickness of 25 μm and containing polyester resin, which had undergone silicone treatment, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (2). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 1.

[0245] [Example 3] A carbamate prepolymer A (95 parts by weight); PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000) (3 parts by weight), a polyol with three hydroxyl groups (2 parts by weight), SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000) (2 parts by weight), a polyol with three hydroxyl groups (2 parts by weight); a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.) (3.9 parts by weight), a crosslinking agent; Irganox 1010 (manufactured by BASF Co., Ltd.) (0.5 parts by weight), an antioxidant; and triacetylacetonate iron (manufactured by Nippon Chemical Industry Co., Ltd.) (0.03 parts by weight), a catalyst, were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, a carbamate-based adhesive solution was coated onto a polyester resin-containing substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The substrate was cured and dried at 130°C for 3 minutes to create an adhesive layer containing carbamate-based adhesive (3). Next, a silicone-treated release sheet (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) with a thickness of 25 μm and containing polyester resin, having undergone silicone treatment, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (3). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 1.

[0246] [Example 4] A carbamate prepolymer A (80 parts by weight); PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000) (a polyol with 3 hydroxyl groups, 12 parts by weight); SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000) (a polyol with 3 hydroxyl groups, 8 parts by weight); a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.) (a crosslinking agent, 6.0 parts by weight); Irganox 1010 (manufactured by BASF Co., Ltd.) (an antioxidant); and triacetylacetonate iron (manufactured by Nippon Chemical Industry Co., Ltd.) (a catalyst) (0.03 parts by weight) were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, a carbamate-based adhesive solution was coated onto a polyester resin substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The solution was cured and dried at 130°C for 3 minutes to create an adhesive layer containing carbamate-based adhesive (4). Next, a 25 μm thick silicone-treated release liner containing polyester resin (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (4). The film was then aged at room temperature for 5 days for evaluation. The release liner was removed just before the evaluation. The results are shown in Table 1.

[0247] [Example 5] A carbamate prepolymer A (60 parts by weight); PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000) (a polyol with three hydroxyl groups) (28 parts by weight); SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000) (a polyol with three hydroxyl groups) (12 parts by weight); a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.) (a crosslinking agent) (8.0 parts by weight); Irganox 1010 (manufactured by BASF Co., Ltd.) (an antioxidant) (0.5 parts by weight); and triacetylacetonate iron (manufactured by Nippon Chemical Industry Co., Ltd.) (a catalyst) (0.03 parts by weight) (the total solid content reached 50% by weight) were diluted with ethyl acetate to obtain a carbamate adhesive solution. Then, a carbamate-based adhesive solution was coated onto a polyester resin-containing substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The substrate was cured and dried at 130°C for 3 minutes to create an adhesive layer containing carbamate-based adhesive (5). Next, a 25 μm thick silicone-treated release liner containing polyester resin (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (5). The film was then aged at room temperature for 5 days for evaluation. The release liner was removed just before the evaluation. The results are shown in Table 1.

[0248] [Example 6] A carbamate prepolymer A (60 parts by weight); PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000) and SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000) (3 hydroxyl polyols) (8.6 parts by weight); Irganox 1010 (manufactured by BASF) (0.5 parts by weight); and triacetin ferric (manufactured by Nippon Chemical Co., Ltd.) (0.03 parts by weight) (50% by weight) were diluted with ethyl acetate to achieve a total solid content of 50%. Then, a carbamate-based adhesive solution was applied to a polyester resin-containing substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The substrate was cured and dried at 130°C for 3 minutes to create an adhesive layer containing carbamate-based adhesive (6). Next, a 25 μm thick silicone-treated release liner containing polyester resin (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (6). The film was then aged at room temperature for 5 days for evaluation. The release liner was removed just before the evaluation. The results are shown in Table 1.

[0249] [Example 7] A carbamate prepolymer A (50 parts by weight); PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000) and SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000) (3 hydroxyl polyols) (9.2 parts by weight); Irganox 1010 (manufactured by BASF) (0.5 parts by weight); and triacetin ferric (manufactured by Nippon Chemical Co., Ltd.) (0.03 parts by weight) (50 parts by weight) were diluted with ethyl acetate to achieve a total solid content of 50% to obtain a carbamate-based adhesive solution. Then, a carbamate-based adhesive solution was applied to a polyester resin-containing substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The substrate was cured and dried at 130°C for 3 minutes to create an adhesive layer containing carbamate-based adhesive (7). Next, a 25 μm thick silicone-treated release liner containing polyester resin (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (7). The film was then aged at room temperature for 5 days for evaluation. The release liner was removed just before the evaluation. The results are shown in Table 1.

[0250] [Example 8] A carbamate prepolymer A (50 parts by weight); PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000) and SANNIX GP4000 (manufactured by Sanyo Chemical Co., Ltd., Mn=4000) (3 hydroxyl polyols) (20 parts by weight); a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.) (8.7 parts by weight) (crosslinking agent); Irganox 1010 (manufactured by BASF Co., Ltd.) (antioxidant) (0.5 parts by weight); and triacetylacetonate iron (manufactured by Nippon Chemical Industry Co., Ltd.) (catalyst) (0.03 parts by weight) (to achieve a total solid content of 50% by weight) were diluted with ethyl acetate to obtain a carbamate-based adhesive solution. Then, a carbamate-based adhesive solution was coated onto a polyester resin substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The solution was cured and dried at 130°C for 3 minutes to create an adhesive layer containing carbamate-based adhesive (8). Next, a 25 μm thick silicone-treated release liner containing polyester resin (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (8). The film was then aged at room temperature for 5 days for evaluation. The release liner was removed just before the evaluation. The results are shown in Table 1.

[0251] [Example 9] A carbamate prepolymer A (50 parts by weight); PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000) and SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000) (3 hydroxyl polyols) (20 parts by weight); a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.) (10.1 parts by weight) (crosslinking agent); Irganox 1010 (manufactured by BASF Co., Ltd.) (antioxidant) (0.5 parts by weight); and triacetylacetonate iron (manufactured by Nippon Chemical Industry Co., Ltd.) (catalyst) (0.03 parts by weight) (to achieve a total solid content of 50% by weight) were diluted with ethyl acetate to obtain a carbamate adhesive solution. Then, a carbamate-based adhesive solution was applied to a polyester resin-containing substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The solution was cured and dried at a drying temperature of 130°C for 3 minutes to create an adhesive layer containing carbamate-based adhesive (9). Next, a silicone-treated release sheet (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) with a thickness of 25 μm and containing polyester resin, which had undergone silicone treatment, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (9). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 1.

[0252] [Example 10] 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, 15 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups, and 5 parts by weight of SANNIX GP1000 (manufactured by Sanyo Chemical Co., Ltd., Mn=1000), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. 12.9 parts by weight of Polyurethane (manufactured by Polyurethane Corporation); 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation) as an antioxidant; and 0.03 parts by weight of triacetin ferric acetone (manufactured by Nippon Chemical Industries Co., Ltd.) as a catalyst were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C and a drying time of 3 minutes to produce an adhesive layer containing carbamate-based adhesive (10). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (10). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 1.

[0253] [Example 11] 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, 18 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups, and 2 parts by weight of SANNIX GP600 (manufactured by Sanyo Chemical Co., Ltd., Mn=600), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. 12.7 parts by weight of Polyurethane (manufactured by Polyurethane Corporation); 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation) as an antioxidant; and 0.03 parts by weight of triacetin ferric acetone (manufactured by Nippon Chemical Industries Co., Ltd.) as a catalyst were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C and a drying time of 3 minutes to produce an adhesive layer containing carbamate-based adhesive (11). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (11). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 1.

[0254] [Example 12] 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, 18 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups, and 2 parts by weight of SANNIX GP400 (manufactured by Sanyo Chemical Co., Ltd., Mn=400), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. 14.0 parts by weight of Polyurethane (manufactured by Polyurethane Corporation); 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation) as an antioxidant; and 0.03 parts by weight of triacetin ferric acetone (manufactured by Nippon Chemical Industries Co., Ltd.) as a catalyst were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (12). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (12). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 1.

[0255] [Example 13] 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. The following ingredients were used: 10.1 parts by weight of 1-ethyl-3-methylimidazolium tri(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), 0.05 parts by weight of Irganox 1010 (manufactured by BASF Corporation), 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Kagaku Sangyo Co., Ltd.), and 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Kagaku Sangyo Co., Ltd.), with the total solid content reaching 50% by weight, and diluted with ethyl acetate to obtain a carbamate-based adhesive solution. The carbamate-based adhesive solution was then coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (13). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (13). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 2.

[0256] [Example 14] 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. The following ingredients were used: 10.1 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidine (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), 0.1 parts by weight of Irganox 1010 (manufactured by BASF Corporation), 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Kagaku Sangyo Co., Ltd.), and 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Kagaku Sangyo Co., Ltd.), with the total solid content reaching 50% by weight, and diluted with ethyl acetate to obtain a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) with a dried thickness of 75 μm, cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (14). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (14). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 2.

[0257] [Example 15] 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. The following ingredients were used: 10.1 parts by weight of 1-ethyl-3-methylimidazolium tri(fluoromethanesulfonyl)imidine (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Kagaku Sangyo Co., Ltd.), and 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Kagaku Sangyo Co., Ltd.), with the total solid content reaching 50% by weight, and diluted with ethyl acetate to obtain a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) with a dried thickness of 75 μm, cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (15). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (15). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 2.

[0258] [Example 16] 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. The following ingredients were used: 10.1 parts by weight of 1-ethyl-3-methylimidazolium tri(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), 0.0 parts by weight of Irganox 1010 (manufactured by BASF Corporation), 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Kagaku Sangyo Co., Ltd.), and 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Kagaku Sangyo Co., Ltd.), with the total solid content reaching 50% by weight, and diluted with ethyl acetate to obtain a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) with a dried thickness of 75 μm, cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (16). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (16). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 2.

[0259] [Example 17] 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, 15 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups, and 5 parts by weight of SANNIX GP1000 (manufactured by Sanyo Chemical Co., Ltd., Mn=1000), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. The following ingredients were used: 12.8 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidine (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Chemical Industry Co., Ltd.), and diluted with ethyl acetate to achieve a total solid content of 50% by weight, to obtain a carbamate-based adhesive solution. The carbamate-based adhesive solution was then coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (17). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (17). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 2.

[0260] [Example 18] 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, 18 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups, and 2 parts by weight of SANNIX GP600 (manufactured by Sanyo Chemical Co., Ltd., Mn=600), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. The following ingredients were used: 12.7 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidine (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Chemical Industry Co., Ltd.), and diluted with ethyl acetate to achieve a total solid content of 50% by weight, to obtain a carbamate-based adhesive solution. The carbamate-based adhesive solution was then coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (18). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (18). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 2.

[0261] [Example 19] 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, 18 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups, and 2 parts by weight of SANNIX GP400 (manufactured by Sanyo Chemical Co., Ltd., Mn=400), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. The following ingredients were used: 13.8 parts by weight of 1-ethyl-3-methylimidazolium tri(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Chemical Industry Co., Ltd.), and diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. The carbamate-based adhesive solution was then coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (19). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (19). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 2.

[0262] [Example 20] 50 parts by weight of urethane prepolymer A; 35 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 15 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. The following ingredients were used: 9.1 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidine (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Chemical Industry Co., Ltd.), and diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. The carbamate-based adhesive solution was then coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (20). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (20). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 2.

[0263] [Example 21] The following are included: 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 10.1 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.05 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. 0.1 parts by weight of F-477 (manufactured by DIC Corporation); 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation) as an antioxidant; and 0.03 parts by weight of triacetin iron (manufactured by Nippon Chemical Industries Co., Ltd.) as a catalyst were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (21). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (21). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 2.

[0264] [Example 22] The following are included: 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 10.1 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.1 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. 0.1 parts by weight of F-477 (manufactured by DIC Corporation); 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation) as an antioxidant; and 0.03 parts by weight of triacetin iron (manufactured by Nippon Chemical Industries Co., Ltd.) as a catalyst were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (22). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (22). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 2.

[0265] [Example 23] The following are included: 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 10.1 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.5 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. 0.1 parts by weight of F-477 (manufactured by DIC Corporation); 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation) as an antioxidant; and 0.03 parts by weight of triacetin iron (manufactured by Nippon Chemical Industries Co., Ltd.) as a catalyst were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (23). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (23). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 2.

[0266] [Example 24] The following are included: 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 10.1 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 1.0 part by weight of 1-ethyl-3-methylimidazolium tri(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. 0.1 parts by weight of F-477 (manufactured by DIC Corporation); 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation) as an antioxidant; and 0.03 parts by weight of triacetin iron (manufactured by Nippon Chemical Industries Co., Ltd.) as a catalyst were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (24). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (24). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 2.

[0267] [Example 25] The following are included: 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 10.1 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.5 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. F-477 (manufactured by DIC Corporation) 0.05 parts by weight; Irganox 1010 (manufactured by BASF Corporation) as an antioxidant 0.5 parts by weight; and triacetin iron (manufactured by Nippon Chemical Industries Co., Ltd.) as a catalyst 0.03 parts by weight were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (25). Subsequently, a silicone-treated release sheet (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (25). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 2.

[0268] [Example 26] The following are included: 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 10.1 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.5 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. 0.5 parts by weight of F-477 (manufactured by DIC Corporation); 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation) as an antioxidant; and 0.03 parts by weight of triacetin iron (manufactured by Nippon Chemical Industries Co., Ltd.) as a catalyst were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (26). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (26). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 2.

[0269] [Example 27] The following are included: 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 10.1 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.5 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. 1.0 part by weight of F-477 (manufactured by DIC Corporation); 0.5 part by weight of Irganox 1010 (manufactured by BASF Corporation) as an antioxidant; and 0.03 part by weight of triacetin iron (manufactured by Nippon Chemical Industries Co., Ltd.) as a catalyst were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (27). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (27). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 2.

[0270] [Example 28] The following are included: 50 parts by weight of urethane prepolymer A; 35 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 15 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 9.1 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.5 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. 0.1 parts by weight of F-477 (manufactured by DIC Corporation); 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation) as an antioxidant; and 0.03 parts by weight of triacetin iron (manufactured by Nippon Chemical Industries Co., Ltd.) as a catalyst were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (28). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (28). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 2.

[0271] [Example 29] The following are included: 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 10.1 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.5 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. F-563 (manufactured by DIC Corporation) 0.05 parts by weight; Irganox 1010 (manufactured by BASF Corporation) as an antioxidant 0.5 parts by weight; and triacetin iron (manufactured by Nippon Chemical Industries Co., Ltd.) as a catalyst 0.03 parts by weight were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (29). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (29). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 3.

[0272] [Example 30] The following are included: 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 10.1 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.5 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. 0.1 parts by weight of F-563 (manufactured by DIC Corporation); 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation) as an antioxidant; and 0.03 parts by weight of triacetin ferric acetone (manufactured by Nippon Chemical Industries Co., Ltd.) as a catalyst were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (30). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (30). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 3.

[0273] [Example 31] The following are included: 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 10.1 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.5 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. F-563 (manufactured by DIC Corporation) 0.5 parts by weight; Irganox 1010 (manufactured by BASF Corporation) as an antioxidant 0.5 parts by weight; and triacetin iron (manufactured by Nippon Chemical Industries Co., Ltd.) as a catalyst 0.03 parts by weight were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C and a drying time of 3 minutes to produce an adhesive layer containing carbamate-based adhesive (31). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (31). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 3.

[0274] [Example 32] The following are included: 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 10.1 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.5 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. 1.0 parts by weight of F-563 (manufactured by DIC Corporation); 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation) as an antioxidant; and 0.03 parts by weight of triacetin iron (manufactured by Nippon Chemical Industries Co., Ltd.) as a catalyst were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (32). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (32). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 3.

[0275] [Example 33] The following are included: 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 10.1 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.5 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. F-569 (manufactured by DIC Corporation) 0.5 parts by weight; Irganox 1010 (manufactured by BASF Corporation) as an antioxidant 0.5 parts by weight; and triacetin iron (manufactured by Nippon Chemical Industries Co., Ltd.) as a catalyst 0.03 parts by weight were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C and a drying time of 3 minutes to produce an adhesive layer containing carbamate-based adhesive (33). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (33). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 3.

[0276] [Example 34] The following are included: 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 10.1 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.5 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. F-552 (manufactured by DIC Corporation) 0.5 parts by weight; Irganox 1010 (manufactured by BASF Corporation) as an antioxidant 0.5 parts by weight; and triacetin iron (manufactured by Nippon Chemical Industries Co., Ltd.) as a catalyst 0.03 parts by weight were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C and a drying time of 3 minutes to produce an adhesive layer containing carbamate-based adhesive (34). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (34). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 3.

[0277] [Example 35] The following are included: 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 10.1 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.5 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. F-559 (manufactured by DIC Corporation) 0.5 parts by weight; Irganox 1010 (manufactured by BASF Corporation) as an antioxidant 0.5 parts by weight; and triacetin iron (manufactured by Nippon Chemical Industries Co., Ltd.) as a catalyst 0.03 parts by weight were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (35). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (35). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 3.

[0278] [Example 36] The following are included: 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 10.1 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.5 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. F-556 (manufactured by DIC Corporation) 0.5 parts by weight; Irganox 1010 (manufactured by BASF Corporation) as an antioxidant 0.5 parts by weight; and triacetin iron (manufactured by Nippon Chemical Industries Co., Ltd.) as a catalyst 0.03 parts by weight were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C and a drying time of 3 minutes to produce an adhesive layer containing carbamate-based adhesive (36). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (36). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 3.

[0279] [Example 37] 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. The following ingredients were used: 10.1 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidine (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), 0.5 parts by weight of reactive silicone oil X-22-4015 (manufactured by Shin-Etsu Chemical Co., Ltd.), 0.1 parts by weight of hydroxyl-containing reactive silicone oil X-22-4015, 0.5 parts by weight of Irganox 1010 (manufactured by BASF), 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Chemical Industry Co., Ltd.), and diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate adhesive solution. Then, a carbamate-based adhesive solution was applied to a polyester resin-containing substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The substrate was cured and dried at 130°C for 3 minutes to create an adhesive layer containing carbamate-based adhesive (37). Next, a silicone-treated release sheet (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) with a thickness of 25 μm and containing polyester resin, which had undergone silicone treatment, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (37). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 3.

[0280] [Example 38] 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. The following ingredients were used: 10.1 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), 0.5 parts by weight of reactive silicone oil KF6001 (manufactured by Shin-Etsu Chemical Co., Ltd.), 0.1 parts by weight of antioxidant Irganox1010 (manufactured by BASF Corporation), and 0.03 parts by weight of catalyst triacetone iron (manufactured by Nippon Chemical Industry Co., Ltd.). The mixture was diluted with ethyl acetate to achieve a total solid content of 50% by weight to obtain a carbamate adhesive solution. Then, a carbamate-based adhesive solution was applied to a polyester resin-containing substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The substrate was cured and dried at 130°C for 3 minutes to create an adhesive layer containing carbamate-based adhesive (38). Next, a silicone-treated release sheet (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) with a thickness of 25 μm and containing polyester resin, having undergone silicone treatment, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (38). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 3.

[0281] [Example 39] 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. 10.1 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidine (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), 0.5 parts by weight of reactive silicone oil KF6002 (manufactured by Shin-Etsu Chemical Co., Ltd.), 0.1 parts by weight of hydroxyl-containing reactive silicone oil KF6002, 0.5 parts by weight of antioxidant Irganox1010 (manufactured by BASF), and 0.03 parts by weight of catalyst triacetone iron (manufactured by Nippon Chemical Industry Co., Ltd.) were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate adhesive solution. Then, a carbamate-based adhesive solution was applied to a polyester resin-containing substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The substrate was cured and dried at a drying temperature of 130°C for 3 minutes to create an adhesive layer containing carbamate-based adhesive (39). Next, a silicone-treated release sheet (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) with a thickness of 25 μm and containing polyester resin, which had undergone silicone treatment, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (39). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 3.

[0282] [Example 40] 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. 10.1 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), 0.5 parts by weight of reactive silicone oil KF6028 (manufactured by Shin-Etsu Chemical Co., Ltd.), 0.1 parts by weight of reactive silicone oil containing hydroxyl groups; 0.5 parts by weight of Irganox1010 (manufactured by BASF Corporation), 0.03 parts by weight of ferric triacetone (manufactured by Nippon Chemical Industry Co., Ltd.), 0.03 parts by weight of ferric triacetone (manufactured by Nippon Chemical Industry Co., Ltd.), were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate adhesive solution. Then, a carbamate-based adhesive solution was applied to a polyester resin substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The solution was cured and dried at 130°C for 3 minutes to create an adhesive layer containing carbamate-based adhesive (40). Next, a 25 μm thick silicone-treated release liner containing polyester resin (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (40). The film was then aged at room temperature for 5 days for evaluation. The release liner was removed just before the evaluation. The results are shown in Table 4.

[0283] [Example 41] 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. The following ingredients were used: 10.1 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), 0.5 parts by weight of non-reactive silicone oil KF643 (manufactured by Shin-Etsu Chemical Co., Ltd.), 0.1 parts by weight of antioxidant Irganox 1010 (manufactured by BASF Corporation), and 0.03 parts by weight of catalyst triacetone iron (manufactured by Nippon Chemical Industry Co., Ltd.). The total solid content was 50% by weight. The mixture was diluted with ethyl acetate to obtain a carbamate adhesive solution. Then, a carbamate-based adhesive solution was coated onto a polyester resin substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The solution was cured and dried at a drying temperature of 130°C for 3 minutes to create an adhesive layer containing carbamate-based adhesive (41). Next, a silicone-treated release sheet (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) with a thickness of 25 μm and containing polyester resin, which had undergone silicone treatment, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (41). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 4.

[0284] [Example 42] 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. The following ingredients were used: 10.1 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), 0.5 parts by weight of non-reactive silicone oil KF640 (manufactured by Shin-Etsu Chemical Co., Ltd.), 0.1 parts by weight of antioxidant Irganox 1010 (manufactured by BASF Corporation), and 0.03 parts by weight of catalyst triacetone iron (manufactured by Nippon Chemical Industry Co., Ltd.). The total solid content was 50% by weight. The mixture was diluted with ethyl acetate to obtain a carbamate adhesive solution. Then, a carbamate-based adhesive solution was applied to a polyester resin-containing substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The substrate was cured and dried at 130°C for 3 minutes to create an adhesive layer containing carbamate-based adhesive (42). Next, a silicone-treated release liner (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) with a thickness of 25 μm and containing polyester resin was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (42). The film was then aged at room temperature for 5 days for evaluation. The release liner was removed just before the evaluation. The results are shown in Table 4.

[0285] [Example 43] The following ingredients were used: 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 10.1 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.5 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; 0.1 parts by weight of non-reactive silicone oil KF615A (manufactured by Shin-Etsu Chemical Co., Ltd.), which does not contain hydroxyl groups; and Irganox 1010, an antioxidant. 0.5 parts by weight of ferric acetone (manufactured by BASF Corporation) and 0.03 parts by weight of ferric triacetone (manufactured by Nippon Chemical Industries Co., Ltd.) as a catalyst were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C and a drying time of 3 minutes to produce an adhesive layer containing carbamate-based adhesive (43). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (43). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 4.

[0286] [Example 44] 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. The following ingredients were used: 10.1 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidine (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), 0.5 parts by weight of non-reactive silicone oil KF352A (manufactured by Shin-Etsu Chemical Co., Ltd.), 0.1 parts by weight of antioxidant Irganox1010 (manufactured by BASF Corporation), and 0.03 parts by weight of catalyst triacetone iron (manufactured by Nippon Chemical Industry Co., Ltd.). The total solid content was 50% by weight. The mixture was diluted with ethyl acetate to obtain a carbamate adhesive solution. Then, a carbamate-based adhesive solution was applied to a polyester resin substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The solution was cured and dried at 130°C for 3 minutes to create an adhesive layer containing carbamate-based adhesive (44). Next, a 25 μm thick silicone-treated release liner containing polyester resin (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (44). The film was then aged at room temperature for 5 days for evaluation. The release liner was removed just before the evaluation. The results are shown in Table 4.

[0287] [Example 45] 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. The following ingredients were used: 10.1 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), 0.5 parts by weight of non-reactive silicone oil KF945 (manufactured by Shin-Etsu Chemical Co., Ltd.), 0.1 parts by weight of antioxidant Irganox 1010 (manufactured by BASF Corporation), and 0.03 parts by weight of catalyst triacetone iron (manufactured by Nippon Chemical Industry Co., Ltd.). The total solid content was 50% by weight. The mixture was diluted with ethyl acetate to obtain a carbamate adhesive solution. Then, a carbamate-based adhesive solution was coated onto a polyester resin-containing substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The solution was cured and dried at a drying temperature of 130°C for 3 minutes to create an adhesive layer containing carbamate-based adhesive (45). Next, a silicone-treated release sheet (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) with a thickness of 25 μm and containing polyester resin, having undergone silicone treatment, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (45). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 4.

[0288] [Example 46] 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. The following ingredients were used: 10.1 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), 0.5 parts by weight of non-reactive silicone oil KF615A (manufactured by Shin-Etsu Chemical Co., Ltd.), 0.05 parts by weight of antioxidant Irganox1010 (manufactured by BASF Corporation), and 0.03 parts by weight of catalyst triacetone iron (manufactured by Nippon Chemical Industry Co., Ltd.). The mixture was diluted with ethyl acetate to achieve a total solid content of 50% by weight to obtain a carbamate adhesive solution. Then, a carbamate-based adhesive solution was applied to a polyester resin-containing substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The solution was cured and dried at a drying temperature of 130°C for 3 minutes to create an adhesive layer containing carbamate-based adhesive (46). Next, a silicone-treated release sheet (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) with a thickness of 25 μm and containing polyester resin, which had undergone silicone treatment, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (46). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 4.

[0289] [Example 47] 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. The following ingredients were used: 10.1 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidine (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), 0.5 parts by weight of non-reactive silicone oil KF615A (manufactured by Shin-Etsu Chemical Co., Ltd.), 0.025 parts by weight of antioxidant Irganox1010 (manufactured by BASF), and 0.03 parts by weight of catalyst triacetone iron (manufactured by Nippon Chemical Industry Co., Ltd.). The mixture was diluted with ethyl acetate to achieve a total solid content of 50% by weight to obtain a carbamate adhesive solution. Then, a carbamate-based adhesive solution was applied to a polyester resin-containing substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The substrate was then cured and dried at a drying temperature of 130°C for 3 minutes to create an adhesive layer containing carbamate-based adhesive (47). Next, a silicone-treated release liner (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) with a thickness of 25 μm and containing polyester resin, having undergone silicone treatment, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (47). The film was then aged at room temperature for 5 days for evaluation. The release liner was removed just before the evaluation. The results are shown in Table 4.

[0290] [Example 48] 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. The following ingredients were used: 10.1 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidine (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), 0.5 parts by weight of non-reactive silicone oil KF615A (manufactured by Shin-Etsu Chemical Co., Ltd.), 0.01 parts by weight of antioxidant Irganox1010 (manufactured by BASF Corporation), and 0.03 parts by weight of catalyst triacetyl acetone iron (manufactured by Nippon Chemical Industry Co., Ltd.). The mixture was diluted with ethyl acetate to achieve a total solid content of 50% by weight to obtain a carbamate adhesive solution. Then, a carbamate-based adhesive solution was applied to a polyester resin-containing substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The solution was cured and dried at a drying temperature of 130°C for 3 minutes to create an adhesive layer containing carbamate-based adhesive (48). Next, a silicone-treated release sheet (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) with a thickness of 25 μm and containing polyester resin, which had undergone silicone treatment, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (48). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 4.

[0291] [Example 49] The following are included: 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 10.1 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.5 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. 0.1 parts by weight of F-563 (manufactured by DIC Corporation), 0.025 parts by weight of KF615A (manufactured by Shin-Etsu Chemical Co., Ltd.) which is a non-reactive silicone oil without hydroxyl groups, 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation) as an antioxidant, and 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Chemical Industry Co., Ltd.) as a catalyst were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (49). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (49). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 4.

[0292] [Example 50] The following are included: 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 10.1 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.3 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. The following ingredients were used: 0.3 parts by weight of F-563 (manufactured by DIC Corporation); 0.3 parts by weight of KF640 (manufactured by Shin-Etsu Chemical Co., Ltd.), a non-reactive silicone oil without hydroxyl groups; 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), an antioxidant; and 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Chemical Industry Co., Ltd.), a catalyst. The total solid content was 50% by weight. The solution was diluted with ethyl acetate to obtain a carbamate-based adhesive solution. The carbamate-based adhesive solution was then coated onto a polyester resin substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The substrate was cured and dried at a drying temperature of 130°C for 3 minutes to form an adhesive layer containing carbamate-based adhesive (50). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (50). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 4.

[0293] [Example 51] The following are included: 50 parts by weight of urethane prepolymer A; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 20 parts by weight of PTGL3000 (manufactured by Hodogaya Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 8.4 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.3 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. 0.3 parts by weight of F-563 (manufactured by DIC Corporation), 0.3 parts by weight of KF640 (manufactured by Shin-Etsu Chemical Co., Ltd.), a non-reactive silicone oil without hydroxyl groups, 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), an antioxidant, and 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Chemical Industry Co., Ltd.), as a catalyst, were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (51). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (51). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 5.

[0294] [Example 52] The following are included: 50 parts by weight of urethane prepolymer A; 25 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 25 parts by weight of PTGL3000 (manufactured by Hodogaya Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 9.0 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.3 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. 0.3 parts by weight of F-563 (manufactured by DIC Corporation), 0.3 parts by weight of KF640 (manufactured by Shin-Etsu Chemical Co., Ltd.), a non-reactive silicone oil without hydroxyl groups, 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), an antioxidant, and 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Chemical Industry Co., Ltd.), a catalyst, were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (52). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (52). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 5.

[0295] [Example 53] The following are included: 50 parts by weight of urethane prepolymer A; 25 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 25 parts by weight of PTGL3000 (manufactured by Hodogaya Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 7.2 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.3 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. 0.3 parts by weight of F-563 (manufactured by DIC Corporation), 0.3 parts by weight of KF640 (manufactured by Shin-Etsu Chemical Co., Ltd.), a non-reactive silicone oil without hydroxyl groups, 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), an antioxidant, and 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Chemical Industry Co., Ltd.), a catalyst, were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (53). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (53). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 5.

[0296] [Example 54] The following are included: 50 parts by weight of urethane prepolymer A; 25 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 25 parts by weight of PTGL3000 (manufactured by Hodogaya Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 6.0 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.3 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. 0.3 parts by weight of F-563 (manufactured by DIC Corporation), 0.3 parts by weight of KF640 (manufactured by Shin-Etsu Chemical Co., Ltd.), a non-reactive silicone oil without hydroxyl groups, 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), an antioxidant, and 0.03 parts by weight of triacetin iron (manufactured by Nippon Chemical Industry Co., Ltd.), a catalyst, were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (54). Subsequently, a silicone-treated release sheet (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (54). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 5.

[0297] [Example 55] The following are included: 50 parts by weight of urethane prepolymer A; 25 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 25 parts by weight of PTGL3000 (manufactured by Hodogaya Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 4.8 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.3 parts by weight of 1-ethyl-3-methylimidazolium tri(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. A carbamate-based adhesive solution was prepared by diluting 0.3 parts by weight of F-563 (manufactured by DIC), 0.3 parts by weight of KF640 (manufactured by Shin-Etsu Chemical Co., Ltd.) (a non-reactive silicone oil without hydroxyl groups), 0.5 parts by weight of Irganox 1010 (manufactured by BASF) (an antioxidant), and 0.03 parts by weight of triacetylacetonate iron (manufactured by Nippon Chemical Industry Co., Ltd.) (a catalyst) with ethyl acetate to achieve a total solid content of 50% by weight. The carbamate-based adhesive solution was then coated onto a polyester resin substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The substrate was cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing the carbamate-based adhesive (55). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (55). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 5.

[0298] [Example 56] The following are included: 70 parts by weight of urethane prepolymer A; 20 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 10 parts by weight of PTGL3000 (manufactured by Hodogaya Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 4.1 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.3 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. 0.3 parts by weight of F-563 (manufactured by DIC Corporation), 0.3 parts by weight of KF640 (manufactured by Shin-Etsu Chemical Co., Ltd.), a non-reactive silicone oil without hydroxyl groups, 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), an antioxidant, and 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Chemical Industry Co., Ltd.), a catalyst, were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (56). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (56). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 5.

[0299] [Example 57] The following are included: 50 parts by weight of urethane prepolymer A; 24 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 26 parts by weight of PTGL3000 (manufactured by Hodogaya Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 6.1 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.3 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. The following ingredients were used: 0.3 parts by weight of F-563 (manufactured by DIC Corporation); 0.3 parts by weight of KF640 (manufactured by Shin-Etsu Chemical Co., Ltd.), a non-reactive silicone oil without hydroxyl groups; 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), an antioxidant; and 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Chemical Industry Co., Ltd.), a catalyst. The total solid content was 50% by weight. The solution was diluted with ethyl acetate to obtain a carbamate-based adhesive solution. The carbamate-based adhesive solution was then coated onto a polyester resin substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The substrate was cured and dried at a drying temperature of 130°C for 3 minutes to form an adhesive layer containing carbamate-based adhesive (57). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (57). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 5.

[0300] [Example 58] The following are included: 50 parts by weight of urethane prepolymer A; 22 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 28 parts by weight of PTGL3000 (manufactured by Hodogaya Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 6.2 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.3 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. A carbamate-based adhesive solution was prepared by diluting 0.3 parts by weight of F-563 (manufactured by DIC), 0.3 parts by weight of KF640 (manufactured by Shin-Etsu Chemical Co., Ltd.) (a non-reactive silicone oil without hydroxyl groups), 0.5 parts by weight of Irganox 1010 (manufactured by BASF) (an antioxidant), and 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Chemical Industry Co., Ltd.) (a catalyst) with ethyl acetate to achieve a total solid content of 50% by weight. The carbamate-based adhesive solution was then coated onto a polyester resin substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The substrate was cured and dried at a drying temperature of 130°C for 3 minutes to form an adhesive layer containing carbamate-based adhesive (58). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (58). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 5.

[0301] [Example 59] The following are included: 50 parts by weight of urethane prepolymer A; 20 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 30 parts by weight of PTGL3000 (manufactured by Hodogaya Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 6.4 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.3 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. 0.3 parts by weight of F-563 (manufactured by DIC Corporation), 0.3 parts by weight of KF640 (manufactured by Shin-Etsu Chemical Co., Ltd.), a non-reactive silicone oil without hydroxyl groups, 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), an antioxidant, and 0.03 parts by weight of triacetin iron (manufactured by Nippon Chemical Industry Co., Ltd.), a catalyst, were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (59). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (59). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 5.

[0302] [Example 60] The following are included: 40 parts by weight of urethane prepolymer A; 25 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 35 parts by weight of PTGL3000 (manufactured by Hodogaya Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 7.1 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.3 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. 0.3 parts by weight of F-563 (manufactured by DIC Corporation), 0.3 parts by weight of KF640 (manufactured by Shin-Etsu Chemical Co., Ltd.), a non-reactive silicone oil without hydroxyl groups, 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), an antioxidant, and 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Chemical Industry Co., Ltd.), as a catalyst, were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (60). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (60). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 5.

[0303] [Example 61] The following are included: 50 parts by weight of urethane prepolymer A; 25 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 25 parts by weight of PTGL3000 (manufactured by Hodogaya Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 9.0 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.3 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. 0.3 parts by weight of F-563 (manufactured by DIC Corporation), 0.3 parts by weight of KF640 (manufactured by Shin-Etsu Chemical Co., Ltd.), a non-reactive silicone oil without hydroxyl groups, 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), an antioxidant, and 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Chemical Industry Co., Ltd.), a catalyst, were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 20 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (61). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (61). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 5.

[0304] [Example 62] The following are included: 50 parts by weight of urethane prepolymer A; 25 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 25 parts by weight of PTGL3000 (manufactured by Hodogaya Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 9.0 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.3 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. 0.3 parts by weight of F-563 (manufactured by DIC Corporation), 0.5 parts by weight of KF640 (manufactured by Shin-Etsu Chemical Co., Ltd.), a non-reactive silicone oil without hydroxyl groups, 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), an antioxidant, and 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Chemical Industry Co., Ltd.), as a catalyst, were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 20 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (62). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (62). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 5.

[0305] [Example 63] The following are included: 50 parts by weight of urethane prepolymer A; 25 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 25 parts by weight of PTGL3000 (manufactured by Hodogaya Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 9.0 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.3 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. The following ingredients were used: 0.3 parts by weight of F-563 (manufactured by DIC Corporation); 1.0 part by weight of KF640 (manufactured by Shin-Etsu Chemical Co., Ltd.), a non-reactive silicone oil without hydroxyl groups; 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), an antioxidant; and 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Chemical Industry Co., Ltd.), a catalyst. The total solid content was 50% by weight. The solution was diluted with ethyl acetate to obtain a carbamate-based adhesive solution. The carbamate-based adhesive solution was then coated onto a polyester resin substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 20 μm after drying. The substrate was cured and dried at a drying temperature of 130°C for 3 minutes to form an adhesive layer containing carbamate-based adhesive (63). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (63). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 5.

[0306] [Example 64] The following are included: 50 parts by weight of urethane prepolymer A; 25 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 25 parts by weight of PTGL3000 (manufactured by Hodogaya Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 9.0 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.3 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. The following ingredients were used: 0.3 parts by weight of F-563 (manufactured by DIC Corporation); 2.0 parts by weight of KF640 (manufactured by Shin-Etsu Chemical Co., Ltd.), a non-reactive silicone oil without hydroxyl groups; 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), an antioxidant; and 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Chemical Industry Co., Ltd.), a catalyst. The total solid content was 50% by weight. The solution was diluted with ethyl acetate to obtain a carbamate-based adhesive solution. The carbamate-based adhesive solution was then coated onto a polyester resin substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 20 μm after drying. The substrate was cured and dried at a drying temperature of 130°C for 3 minutes to form an adhesive layer containing carbamate-based adhesive (64). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (64). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 5.

[0307] [Example 65] The following are included: 70 parts by weight of urethane prepolymer B; 20 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 10 parts by weight of PTGL3000 (manufactured by Hodogaya Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 3.9 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.3 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. The following mixtures were prepared: 0.3 parts by weight of F-563 (manufactured by DIC Corporation); 2.0 parts by weight of KF640 (manufactured by Shin-Etsu Chemical Co., Ltd.), a non-reactive silicone oil without hydroxyl groups; 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), an antioxidant; and 0.03 parts by weight of triacetin ferric acetate (manufactured by Nippon Chemical Industry Co., Ltd.), a catalyst. The mixture was diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. The carbamate-based adhesive solution was then coated onto a polyester resin-containing substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 20 μm after drying. The substrate was cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (65). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (65). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 5.

[0308] [Example 66] The following are included: 50 parts by weight of urethane prepolymer B; 25 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, and 25 parts by weight of PTGL3000 (manufactured by Hodogaya Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 5.9 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.3 parts by weight of 1-ethyl-3-methylimidazolium tris(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. The following ingredients were used: 0.3 parts by weight of F-563 (manufactured by DIC Corporation); 2.0 parts by weight of KF640 (manufactured by Shin-Etsu Chemical Co., Ltd.), a non-reactive silicone oil without hydroxyl groups; 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), an antioxidant; and 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Chemical Industry Co., Ltd.), a catalyst. The total solid content was 50% by weight. The solution was diluted with ethyl acetate to obtain a carbamate-based adhesive solution. The carbamate-based adhesive solution was then coated onto a polyester resin substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 20 μm after drying. The substrate was cured and dried at a drying temperature of 130°C for 3 minutes to form an adhesive layer containing carbamate-based adhesive (66). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (66). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 5.

[0309] [Example 67] The following are included: 40 parts by weight of urethane prepolymer B; 25 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 35 parts by weight of PTGL3000 (manufactured by Hodogaya Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 7.0 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent; 0.3 parts by weight of 1-ethyl-3-methylimidazolium tri(fluoromethanesulfonyl)imidin (AS110, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), an ionic compound; and MEGAFAC, a fluorinated oligomer. The following ingredients were used: 0.3 parts by weight of F-563 (manufactured by DIC Corporation); 2.0 parts by weight of KF640 (manufactured by Shin-Etsu Chemical Co., Ltd.), a non-reactive silicone oil without hydroxyl groups; 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation), an antioxidant; and 0.03 parts by weight of triacetyl acetone iron (manufactured by Nippon Chemical Industry Co., Ltd.), a catalyst. The total solid content was 50% by weight. The solution was diluted with ethyl acetate to obtain a carbamate-based adhesive solution. The carbamate-based adhesive solution was then coated onto a polyester resin substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 20 μm after drying. The substrate was cured and dried at a drying temperature of 130°C for 3 minutes to form an adhesive layer containing carbamate-based adhesive (67). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (67). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 5.

[0310] [Comparative Example 1] A carbamate prepolymer B was diluted with ethyl acetate to achieve a total solids content of 50% by weight. This was achieved by mixing 100 parts by weight of the prepolymer B, 2.9 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.) as a crosslinking agent, 0.5 parts by weight of Irganox 1010 (manufactured by BASF Co., Ltd.) as an antioxidant, and 0.03 parts by weight of triacetylacetonate iron (manufactured by Nippon Chemical Co., Ltd.) as a catalyst. The carbamate adhesive solution was then coated with the carbamate adhesive solution to a thickness of 75 μm after drying onto a polyester resin substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.), and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing the carbamate adhesive (C1). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (C1). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 6.

[0311] [Comparative Example 2] A carbamate prepolymer B was prepared by diluting 50 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, 35 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, 15 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent, 9.1 parts by weight of Irganox 1010 (manufactured by BASF Co., Ltd.), an antioxidant, and 0.5 parts by weight of triacetylacetone iron (manufactured by Nippon Chemical Industry Co., Ltd.), a catalyst, with the total solid content reaching 50% by weight, using ethyl acetate to obtain a carbamate-based adhesive solution. Then, a carbamate-based adhesive solution was coated onto a polyester resin-containing substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a dried thickness of 75 μm. The solution was cured and dried at 130°C for 3 minutes to create an adhesive layer containing carbamate-based adhesive (C2). Next, a 25 μm thick silicone-treated release liner containing polyester resin (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (C2). The film was then aged at room temperature for 5 days for evaluation. The release liner was removed just before the evaluation. The results are shown in Table 6.

[0312] [Comparative Example 3] A carbamate prepolymer B was prepared by diluting 50 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, 20 parts by weight of SANNIX GP4000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent, 8.6 parts by weight of Irganox 1010 (manufactured by BASF Co., Ltd.), an antioxidant, and 0.5 parts by weight of triacetylacetonate iron (manufactured by Nippon Chemical Industry Co., Ltd.), a catalyst, with the total solid content reaching 50% by weight, using ethyl acetate to obtain a carbamate-based adhesive solution. Then, a carbamate-based adhesive solution was coated onto a polyester resin-containing substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a dried thickness of 75 μm. The solution was cured and dried at 130°C for 3 minutes to create an adhesive layer containing carbamate-based adhesive (C3). Next, a 25 μm thick silicone-treated release liner containing polyester resin (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (C3). The film was then aged at room temperature for 5 days for evaluation. The release liner was removed just before evaluation. The results are shown in Table 6.

[0313] [Comparative Example 4] A carbamate prepolymer B was prepared by diluting 50 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, 20 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.), a crosslinking agent, 10.1 parts by weight of Irganox 1010 (manufactured by BASF Co., Ltd.), an antioxidant, and 0.03 parts by weight of triacetylacetonate iron (manufactured by Nippon Chemical Industry Co., Ltd.), with the total solid content reaching 50% by weight, using ethyl acetate to obtain a carbamate-based adhesive solution. Then, a carbamate-based adhesive solution was coated onto a polyester resin-containing substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. It was then cured and dried at a drying temperature of 130°C for 3 minutes to create an adhesive layer containing carbamate-based adhesive (C4). Next, a 25 μm thick silicone-treated release liner containing polyester resin (trade name "MRF25", thickness 25 μm, manufactured by Mitsubishi Chemical Co., Ltd.) was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (C4). The film was then aged at room temperature for 5 days for evaluation. The release liner was removed just before the evaluation. The results are shown in Table 6.

[0314] [Comparative Example 5] 50 parts by weight of urethane prepolymer B; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, 15 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups, 5 parts by weight of SANNIX GP1000 (manufactured by Sanyo Chemical Co., Ltd., Mn=1000), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. The following ingredients were used: 12.9 parts by weight of polyurethane (manufactured by Polyurethane Corporation); 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation) as an antioxidant; and 0.03 parts by weight of triacetin ferric acetone (manufactured by Nippon Chemical Industries Co., Ltd.) as a catalyst. The total solid content was 50% by weight. The mixture was diluted with ethyl acetate to obtain a carbamate-based adhesive solution. The carbamate-based adhesive solution was then coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The substrate was cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (C5). Subsequently, a 25 μm thick silicone-treated release sheet containing polyester resin (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (C5). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 6.

[0315] [Comparative Example 6] 50 parts by weight of urethane prepolymer B; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups, 18 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups, and 2 parts by weight of SANNIX GP600 (manufactured by Sanyo Chemical Co., Ltd., Mn=600), a polyol with three hydroxyl groups; and a polyfunctional isocyanate compound (Coronate HX:C / HX, Nippon) as a crosslinking agent. The following ingredients were used: 12.7 parts by weight of polyurethane (manufactured by Polyurethane Corporation); 0.5 parts by weight of Irganox 1010 (manufactured by BASF Corporation) as an antioxidant; and 0.03 parts by weight of triacetin ferric acetone (manufactured by Nippon Chemical Industries Co., Ltd.) as a catalyst. The total solid content was 50% by weight. The mixture was diluted with ethyl acetate to obtain a carbamate-based adhesive solution. The carbamate-based adhesive solution was then coated onto a polyester resin-containing substrate (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying. The substrate was cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (C6). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (C6). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 6.

[0316] [Comparative Example 7] The following were used: 50 parts by weight of urethane prepolymer B; 30 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000), a polyol with three hydroxyl groups; 18 parts by weight of SANNIX GP3000 (manufactured by Sanyo Chemical Co., Ltd., Mn=3000), a polyol with three hydroxyl groups; 2 parts by weight of SANNIX GP400 (manufactured by Sanyo Chemical Co., Ltd., Mn=400), a polyol with three hydroxyl groups; 13.8 parts by weight of a polyfunctional isocyanate compound (Coronate HX:C / HX, manufactured by Nippon Polyurethane Co., Ltd.) as a crosslinking agent; and Irganox 1010 as an antioxidant. 0.5 parts by weight of ferric acetone (manufactured by BASF Corporation) and 0.03 parts by weight of ferric triacetone (manufactured by Nippon Chemical Industries Co., Ltd.) as a catalyst were diluted with ethyl acetate to achieve a total solid content of 50% by weight, thereby obtaining a carbamate-based adhesive solution. Then, the carbamate-based adhesive solution was coated onto a substrate containing polyester resin (trade name "T100-75S", thickness 75 μm, manufactured by Mitsubishi Chemical Co., Ltd.) to a thickness of 75 μm after drying, and cured and dried at a drying temperature of 130°C for 3 minutes to produce an adhesive layer containing carbamate-based adhesive (C7). Subsequently, a silicone-treated release sheet (trade name "MRF25", 25 μm thick, manufactured by Mitsubishi Chemical Co., Ltd.) containing polyester resin, with a thickness of 25 μm, was bonded to the surface of the obtained adhesive layer to obtain a surface protective film (C7). The film was then aged at room temperature for 5 days for evaluation. The release sheet was removed just before the evaluation. The results are shown in Table 6.

[0317] [Table 1] Structural unit Carbamate prepolymer and polyol [parts by weight] Carbamate polymer: polyol ratio Weight ratio of the first polyol / weight ratio of the second polyol Polyfunctional isocyanate compounds (Cross-linking agent) [Parts by weight] [NCO] / [OH] Ionic compounds Fluorine additives Silicone additives Adhesive surface elastic modulus [MPa] The static voltage [kV] for glass stripping (Absolute value) For the adhesion of glass [gf / 25 mm] Haze [%] No. 31B Regarding the residual adhesion of glass [%] Carbamate prepolymer A Carbamate prepolymer B First polyol (5,000~20,000) Second polyol (300~4,999) PTMG3000 (Mn:3,000) SANNIX GP1500 (Mn:1,500) SANNIX PP2000 (Mn:2,000) SANNIX GP1000 (Mn:1,000) KURARAY POLYOL P2010 PREMINOL S 3011 (Mn:10,000) SANNIX GP4000 (Mn:4,000 SANNIX GP3000 (Mn:3,000) SANNIX GP1000 (Mn:1,000) SANNIX GP600 (Mn:600) SANNIX GP400 (Mn:400) PTGL3000 (Mn:3,000) General formula (1) (Source: PTMG) ·(80%) - - - - - - - - - - · C / HX type Mixing amount [Parts by weight] type (Next section: Surface tension of a 0.1% toluene solution) Mixing amount [Parts by weight] type (Next paragraph: Presence or absence of hydroxyl groups) Mixing amount [Parts by weight] General formula (2) (Source: PPG) ·(20%) - ·(45%) ·(45%) · · · · · · · - Polyester polyols - - - - ·(10%) - - - - - - - Example 1 100 - - - - - - - - 100:0 Carbamate prepolymer alone 3.2 1.5 - - - - - - 1.05 10.1 6.1 0.4 94 Example 2 95 - 3.5 - 1.5 - - - - 95:5 2.3 3.8 1.5 - - - - - - 1.20 11.5 4.1 3.8 94 Example 3 95 - 3 - 2 - - - - 95:5 1.5 3.9 1.5 - - - - - - 1.25 12.3 4.0 2.2 91 Example 4 80 - 12 - 8 - - - - 80:20 1.5 6.0 1.5 - - - - - - 1.35 12.3 3.6 2.2 93 Example 5 60 - 28 - 12 - - - - 60:40 2.3 8.0 1.5 - - - - - - 1.40 11.9 3.7 4.0 92 Example 6 60 - 25 - 15 - - - - 60:40 1.7 8.6 1.5 - - - - - - 1.45 11.2 3.6 2.0 92 Example 7 50 - 35 - 15 - - - - 50:50 2.3 9.2 1.5 - - - - - - 1.60 11.2 3.8 3.6 94 Example 8 50 - 30 20 - - - - - 50:50 1.5 8.7 1.5 - - - - - - 1.90 11.9 3.6 1.6 91 Example 9 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 - - - - - - 2.00 11.4 3.3 1.6 93 Example 10 50 - 30 - 15 5 - - - 50:50 1.5 12.9 1.5 - - - - - - 2.05 12.1 3.1 2.1 94 Example 11 50 - 30 - 18 - 2 - - 50:50 1.5 12.7 1.5 - - - - - - 2.10 11.8 2.9 2.6 91 Example 12 50 - 30 - 18 - - 2 - 50:50 1.5 14.0 1.5 - - - - - - 2.20 11.7 3.0 2.5 92

[0318] [Table 2] Structural unit Carbamate prepolymer and polyol [parts by weight] Carbamate polymer: polyol ratio Weight ratio of the first polyol / weight ratio of the second polyol Polyfunctional isocyanate compounds (Cross-linking agent) [Parts by weight] [NCO] / [OH] Ionic compounds Fluorine additives Silicone additives Adhesive surface elastic modulus [MPa] The static voltage [kV] for glass stripping (Absolute value) For the adhesion of glass [gf / 25 mm] Haze [%] No. 31B Regarding the residual adhesion of glass [%] Carbamate prepolymer A Carbamate prepolymer B First polyol (5,000~20,000) Second polyol (300~4,999) PTMG3000 (Mn:3,000) SANNIX GP1500 (Mn:1,500) SANNIX PP2000 (Mn:2,000) SANNIX GP1000 (Mn:1,000) KURARAY POLYOL P2010 PREMINOL S 3011 (Mn:10,000) SANNIX GP4000 (Mn:4,000 SANNIX GP3000 (Mn:3,000) SANNIX GP1000 (Mn:1,000) SANNIX GP600 (Mn:600) SANNIX GP400 (Mn:400) PTGL3000 (Mn:3,000) General formula (1) (Source: PTMG) ·(80%) - - - - - - - - - - · C / HX Kind Mixing amount [Parts by weight] Kind (Next section: Surface tension of 0.1% toluene solution) Mixing amount [Parts by weight] Kind (Next section: Whether or not there is hydroxychloroquine) Mixing amount [Parts by weight] General formula (2) (Source: PPG) ·(20%) - ·(45%) ·(45%) - · · · · · · - Polyester polyols - - - - ·(10%) - - - - - - - Example 13 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.05 - - - - 1.91 3.4 2.4 1.6 94 Example 14 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.10 - - - - 1.93 3.2 2.3 1.7 93 Example 15 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 - - - - 1.92 2.7 2.3 2.0 93 Example 16 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 1.00 - - - - 2.00 2.5 2.2 2.5 92 Example 17 50 - 30 - 15 5 - - - 50:50 1.5 12.8 1.5 AS110 0.50 - - - - 2.05 2.8 3.1 2.6 92 Example 18 50 - 30 - 18 - 2 - - 50:50 1.5 12.7 1.5 AS110 0.50 - - - - 2.10 2.7 2.9 3.2 90 Example 19 50 - 30 - 18 - - 2 - 50:50 1.5 13.8 1.5 AS110 0.50 - - - - 2.20 2.7 2.8 3.3 90 Example 20 50 - 35 - 15 - - - - 50:50 2.3 9.1 1.5 AS110 0.50 - - - - 1.60 3.1 2.3 5.0 93 Example 21 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.05 F-477 (26.4) 0.10 - - 1.98 0.48 2.4 1.5 90 Example 22 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.10 F-477 (26.4) 0.10 - - 1.97 0.43 2.3 1.6 93 Example 23 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 F-477 (26.4) 0.10 - - 2.03 0.31 2.3 1.9 92 Example 24 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 1.00 F-477 (26.4) 0.10 - - 2.05 0.26 2.2 2.3 93 Example 25 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 F-477 (26.4) 0.05 - - 2.01 0.65 2.3 1.9 91 Example 26 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 F-477 (26.4) 0.50 - - 1.94 0.23 2.2 2.0 93 Example 27 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 F-477 (26.4) 1.00 - - 1.98 0.15 2.1 2.3 91 Example 28 50 - 35 - 15 - - - - 50:50 2.3 9.1 1.5 AS110 0.50 F-477 (26.4) 0.10 - - 1.65 0.23 2.2 4.9 94

[0319] [Table 3] Structural unit Carbamate prepolymer and polyol [parts by weight] Carbamate polymer: polyol ratio Weight ratio of the first polyol / weight ratio of the second polyol Polyfunctional isocyanate compounds (Cross-linking agent) [Parts by weight] [NCO] / [OH] Ionic compounds Fluorine additives Silicone additives Adhesive surface elastic modulus [MPa] The static voltage [kV] for glass stripping (Absolute value) For the adhesion of glass [gf / 25 mm] Haze [%] No. 31B Regarding the residual adhesion of glass [%] Carbamate prepolymer A Carbamate prepolymer B First polyol (5,000~20,000) Second polyol (300~4,999) PTMG3000 (Mn:3,000) SANNIX GP1500 (Mn:1,500) SANNIX PP2000 (Mn:2,000) SANNIX GP1000 (Mn:1,000) KURARAY POLYOL P2010 PREMINOL S 3011 (Mn:10,000) SANNIX GP4000 (Mn:4,000 SANNIX GP3000 (Mn:3,000) SANNIX GP1000 (Mn:1,000) SANNIX GP600 (Mn:600) SANNIX GP400 (Mn:400) PTGL3000 (Mn:3,000) General formula (1) (Source: PTMG) ·(80%) - - - - - - - - - - · C / HX type Mixing amount [Parts by weight] type (Next section: Surface tension of a 0.1% toluene solution) Mixing amount [Parts by weight] type (Next paragraph: Presence or absence of hydroxyl groups) Mixing amount [Parts by weight] General formula (2) (Source: PPG) ·(20%) - ·(45%) ·(45%) - · · · · · · - Polyester polyols - - - - ·(10%) - - - - - - - Example 29 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 F-563 (20.2) 0.05 - - 2.10 0.64 1.3 1.5 93 Example 30 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 F-563 (20.2) 0.10 - - 2.07 0.30 1.2 1.6 91 Example 31 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 F-563 (20.2) 0.50 - - 2.03 0.20 1.1 1.9 91 Example 32 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 F-563 (20.2) 1.00 - - 1.97 0.17 1.0 2.1 91 Example 33 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 F-569 (19.7) 0.50 - - 1.95 0.16 1.2 2.0 90 Example 34 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 F-552 (24.9) 0.50 - - 1.98 0.23 1.3 2.2 89 Example 35 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 F-559 (26.1) 0.50 - - 2.01 0.45 2.3 2.0 93 Example 36 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 F-556 (27.5) 0.50 - - 2.04 0.45 2.1 1.8 91 Example 37 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 - - X-22-4015 (Single-terminal OH) 0.10 2.05 0.34 1.4 2.2 93 Example 38 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 - - KF6001 (OH groups at both ends) 0.10 1.97 0.27 1.5 1.4 93 Example 39 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 - - KF6002 (OH groups at both ends) 0.10 1.95 0.25 1.5 2.0 93

[0320] [Table 4] Structural unit Carbamate prepolymer and polyol [parts by weight] Carbamate polymer: polyol ratio Weight ratio of the first polyol / weight ratio of the second polyol Polyfunctional isocyanate compounds (Cross-linking agent) [Parts by weight] [NCO] / [OH] Ionic compounds Fluorine additives Silicone additives Adhesive surface elastic modulus [MPa] The static voltage [kV] for glass stripping (Absolute value) For the adhesion of glass [gf / 25 mm] Haze [%] No. 31B Regarding the residual adhesion of glass [%] Carbamate prepolymer A Carbamate prepolymer B First polyol (5,000~20,000) Second polyol (300~4,999) PTMG3000 (Mn:3,000) SANNIX GP1500 (Mn:1,500) SANNIX PP2000 (Mn:2,000) SANNIX GP1000 (Mn:1,000) KURARAY POLYOL P2010 PREMINOL S 3011 (Mn:10,000) SANNIX GP4000 (Mn:4,000 SANNIX GP3000 (Mn:3,000) SANNIX GP1000 (Mn:1,000) SANNIX GP600 (Mn:600) SANNIX GP400 (Mn:400) PTGL3000 (Mn:3,000) General formula (1) (Source: PTMG) ·(80%) - - - - - - - - - - · C / HX Kind Mixing amount [Parts by weight] Kind (Next section: Surface tension of 0.1% toluene solution) Mixing amount [Parts by weight] Kind (Next paragraph: Presence or absence of hydroxyl groups) Mixing amount [Parts by weight] General formula (2) (Source: PPG) ·(20%) - ·(45%) ·(45%) - · · · · · · - Polyester polyols - - - - ·(10%) - - - - - - - Example 40 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 - - KF6028 (OH groups at both ends) 0.10 2.03 0.29 1.8 1.9 94 Example 41 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 - - KF643 (HLB value: 14) 0.10 2.01 0.32 1.5 2.1 85 Example 42 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 - - KF640 (HLB value: 14) 0.10 1.94 0.29 1.4 2.2 84 Example 43 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 - - KF615A (HLB value: 10) 0.10 2.02 0.26 1.0 2.2 83 Example 44 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 - - KF352A (HLB value: 7) 0.10 2.05 0.21 0.8 2.2 72 Example 45 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 - - KF945 (HLB value: 4) 0.10 2.03 0.20 0.5 2.1 63 Example 46 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 - - KF615A (HLB value: 10) 0.05 1.97 0.28 1.0 2.1 85 Example 47 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 - - KF615A (HLB value: 10) 0.025 1.95 0.29 1.1 2.1 83 Example 48 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 - - KF615A (HLB value: 10) 0.01 1.98 0.30 1.2 2.1 91 Example 49 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.50 F-563 (20.2) 0.10 KF615A (HLB value: 10) 0.025 2.04 0.11 0.9 2.1 89 Example 50 50 - 30 - 20 - - - - 50:50 1.5 10.1 1.5 AS110 0.30 F-563 (20.2) 0.30 KF640 (HLB value: 14) 0.30 2.01 0.31 1.3 1.8 85

[0321] [Table 5] Structural unit Carbamate prepolymer and polyol [parts by weight] Carbamate polymer: polyol ratio Weight ratio of the first polyol / weight ratio of the second polyol Polyfunctional isocyanate compounds (Cross-linking agent) [Parts by weight] [NCO] / [OH] Ionic compounds Fluorine additives Silicone additives Adhesive surface elastic modulus [MPa] The static voltage [kV] for glass stripping (Absolute value) For the adhesion of glass [gf / 25 mm] Haze [%] No. 31B Regarding the residual adhesion of glass [%] Carbamate prepolymer A Carbamate prepolymer B First polyol (5,000~20,000) Second polyol (300~4,999) PTMG3000 (Mn:3,000) SANNIX GP1500 (Mn:1,500) SANNIX PP2000 (Mn:2,000) SANNIX GP1000 (Mn:1,000) KURARAY POLYOL P2010 PREMINOL S 3011 (Mn:10,000) SANNIX GP4000 (Mn:4,000 SANNIX GP3000 (Mn:3,000) SANNIX GP1000 (Mn:1,000) SANNIX GP600 (Mn:600) SANNIX GP400 (Mn:400) PTGL3000 (Mn:3,000) General formula (1) (Source: PTMG) ·(80%) - - - - - - - - - - · C / HX type Mixing amount [Parts by weight] type (Next section: Surface tension of a 0.1% toluene solution) Mixing amount [Parts by weight] type (Next paragraph: Presence or absence of hydroxyl groups) Mixing amount [Parts by weight] General formula (2) (Source: PPG) ·(20%) - ·(45%) ·(45%) - · · · · · · - Polyester polyols - - - - ·(10%) - - - - - - - Example 51 50 - 30 - - - - - 20 50:50 1.5 8.4 1.5 AS110 0.30 F-563 (20.2) 0.30 KF640 (HLB value: 14) 0.30 2.75 0.28 1.4 1.8 85 Example 52 50 - 25 - - - - - 25 50:50 1.0 9.0 1.5 AS110 0.30 F-563 (20.2) 0.30 KF640 (HLB value: 14) 0.30 2.90 0.27 1.4 1.8 85 Example 53 50 - 25 - - - - - 25 50:50 1.0 7.2 1.2 AS110 0.30 F-563 (20.2) 0.30 KF640 (HLB value: 14) 0.30 2.85 0.40 1.4 1.7 85 Example 54 50 - 25 - - - - - 25 50:50 1.0 6.0 1.0 AS110 0.30 F-563 (20.2) 0.30 KF640 (HLB value: 14) 0.30 2.70 0.35 1.5 1.5 85 Example 55 50 - 25 - - - - - 25 50:50 1.0 4.8 0.8 AS110 0.30 F-562 (20.2) 0.30 KF640 (HLB value: 14) 0.30 2.55 0.32 1.9 1.5 85 Example 56 70 - 20 - - - - - 10 70:30 2.0 4.1 1.0 AS110 0.30 F-563 (20.2) 0.30 KF640 (HLB value: 14) 0.30 2.35 0.31 1.9 1.5 85 Example 57 50 - twenty four - - - - - 26 50:50 0.9 6.1 1.0 AS110 0.30 F-563 (20.2) 0.30 KF640 (HLB value: 14) 0.30 2.50 0.32 1.5 1.6 84 Example 58 50 - twenty two - - - - - 28 50:50 0.8 6.2 1.0 AS110 0.30 F-563 (20.2) 0.30 KF640 (HLB value: 14) 0.30 2.65 0.34 1.4 1.6 84 Example 59 50 - 20 - - - - - 30 50:50 0.7 6.4 1.0 AS110 0.30 F-563 (20.2) 0.30 KF640 (HLB value: 14) 0.30 2.75 0.31 1.4 1.6 64 Example 60 40 - 25 - - - - - 35 40:60 0.7 7.1 1.0 A5110 0.30 F-563 (20.2) 0.30 KF640 (HLB value: 14) 0.30 2.80 0.28 1.3 1.7 84 Example 61 50 - 25 - - - - - 25 50:50 1.0 9.0 1.5 AS110 0.30 F-563 (20.2) 0.30 KF640 (HLB value: 14) 0.30 2.65 0.34 1.5 1.5 83 Example 62 50 - 25 - - - - - 25 50:50 1.0 9.0 1.5 AS110 0.30 F-563 (20.2) 0.30 KF640 (HLB value: 14) 0.50 2.60 0.33 1.3 1.6 82 Example 63 50 - 25 - - - - - 25 50:50 1.0 9.0 1.5 AS110 0.30 F-563 (20.2) 0.30 KF640 (HLB value: 14) 1.00 2.65 0.33 1.2 1.7 81 Example 64 50 - 25 - - - - - 25 50:50 1.0 9.0 1.5 AS110 0.30 F-563 (20.2) 0.30 KF640 (HLB value: 14) 2.00 2.60 0.32 1.0 1.7 81 Example 65 - 70 20 - - - - - 10 70:30 2.0 3.9 1.0 AS110 0.30 F-563 (20.2) 0.30 KF640 (HLB value: 14) 2.00 1.30 0.30 1.9 1.6 85 Example 66 - 50 25 - - - - - 25 50:50 1.0 5.9 1.0 AS110 0.30 F-563 (20.2) 0.30 KF640 (HLB value: 14) 2.00 1.70 0.29 1.4 1.7 84 Example 67 - 40 25 - - 35 40:60 0.7 7.0 1.0 AS110 0.30 F-563 (20.2) 0.30 KF640 (HLB value: 14) 2.00 1.90 0.28 1.4 1.7 84

[0322] [Table 6] Structural unit Carbamate prepolymer and polyol [parts by weight] Carbamate polymer: polyol ratio Weight ratio of the first polyol / weight ratio of the second polyol Polyfunctional isocyanate compounds (Cross-linking agent) [Parts by weight] [NCO] / [OH] Ionic compounds Fluorine additives Silicone additives Adhesive surface elastic modulus [MPa] The static voltage [kV] for glass stripping (Absolute value) For the adhesion of glass [gf / 25 mm] Haze [%] No. 31B Regarding the residual adhesion of glass [%] Carbamate prepolymer A Carbamate prepolymer B First polyol (5,000~20,000) Second polyol (300~4,999) PTMG3000 (Mn:3,000) SANNIX GP1500 (Mn:1,500) SANNIX PP2000 (Mn:2,000) SANNIX GP1000 (Mn:1,000) KURARAY POLYOL P2010 PREMINOL S 3011 (Mn:10,000) SANNIX GP4000 (Mn:4,000 SANNIX GP3000 (Mn:3,000) SANNIX GP1000 (Mn:1,000) SANNIX GP600 (Mn:600) SANNIX GP400 (Mn:400) PTGL3000 (Mn:3,000) General formula (1) (Source: PTMG) ·(80%) - - - - - - - - - - · C / HX type Mixing amount [Parts by weight] type (Next section: Surface tension of a 0.1% toluene solution) Mixing amount [Parts by weight] type (Next paragraph: Presence or absence of hydroxyl groups) Mixing amount [Parts by weight] General formula (2) (Source: PPG) ·(20%) - ·(45%) ·(45%) - · · · · · · - Polyester polyols - - - - ·(10%) - - - - - - - Comparative Example 1 - 100 - - - - - - - 100:0 Carbamate prepolymer alone 2.9 1.5 - - - - - - 0.20 9.8 6.4 0.6 93 Comparative Example 2 - 50 35 - 15 - - - - 50:50 2.3 9.1 1.5 - - - - - - 0.30 11.2 3.7 3.9 92 Comparative Example 3 - 50 30 20 - - - - - 50:50 1.5 8.6 1.5 - - - - - - 0.50 11.9 3.6 1.5 91 Comparative Example 4 - 50 30 - 20 - - - - 50:50 1.5 10.1 1.5 - - - - - - 0.60 11.5 3.3 1.5 93 Comparative Example 5 - 50 30 - 15 5 - - - 50:50 1.5 12.9 1.5 - - - - - - 0.65 12.1 3.1 2.3 91 Comparative Example 6 - 50 30 - 18 - 2 - - 50:50 1.5 12.7 1.5 - - - - - - 0.70 11.5 2.9 2.7 90 Comparative Example 7 - 50 30 - 18 - - 2 - 50:50 1.5 13.8 1.5 - - - - - - 0.75 11.3 2.8 2.8 91 [Industrial Applicability]

[0323] The surface protective film of this invention can be used for any suitable application. Preferably, the surface protective film of this invention can be used for the surface protection of optical components or electronic components.

[0324] 1: Substrate layer 2: Adhesive layer 10: Surface protective film

Claims

1. A surface protective film comprising a carbamate-based adhesive layer, the carbamate-based adhesive layer comprising a carbamate-based adhesive formed from a carbamate-based adhesive composition, the carbamate-based adhesive composition (A) comprising a carbamate prepolymer, a polyol, and a polyfunctional isocyanate compound, wherein the carbamate prepolymer and / or the polyol has structural units represented by the following general formula (1); or (C) comprising a polyol having structural units represented by the following general formula (1), and a polyfunctional isocyanate compound; and the surface elastic modulus of the carbamate-based adhesive layer is 0.8 MPa or higher, [Chemical 1] (In general formula (1), R1 represents one of the groups consisting of hydrogen atoms, alkyl groups with 1 to 4 carbon atoms, and hydroxyalkyl groups with 1 to 6 carbon atoms; multiple R1s may be the same or different; n represents an integer from 1 to 4; m is the number of repetitions of the structural unit, representing an integer from 1 to 200).

2. The surface protective film of claim 1, wherein the above-mentioned urethane prepolymer and / or the above-mentioned polyol have structural units as shown in the following general formula (2), wherein the content ratio of the structural units as shown in the above-mentioned general formula (1) in the above-mentioned urethane adhesive composition is greater than the content ratio of the structural units as shown in the following general formula (2), [Chemical 2] (in general formula (2), R2 represents one of the groups selected from hydrogen atoms and alkyl groups having 1 to 4 carbon atoms; the plurality of R2s may be the same or different from each other; p is the number of repetitions of the structural unit, representing an integer from 1 to 300).

3. The surface protective film of claim 1 or 2, wherein the above-mentioned carbamate adhesive composition contains an ionic compound, and the content of the ionic compound relative to 100 parts by weight of the above-mentioned carbamate prepolymer and the above-mentioned polyol is 0.05 parts by weight or more.

4. The surface protective film of claim 1 or 2, wherein the above-mentioned carbamate adhesive composition comprises at least one selected from the group consisting of fluorinated additives and silicone additives, and the total amount of the fluorinated additives and the silicone additives is at least 0.01 parts by weight relative to 100 parts by weight of the total carbamate prepolymer and the polyol.

5. The surface protective film of claim 1 or 2, wherein the peeling force when the above-mentioned carbamate adhesive layer is adhered to the glass plate and peeled from the glass plate at a peeling angle of 180 degrees and a peeling speed of 300 mm / min after 30 minutes at 23°C is 0.5 gf / 25 mm to 2.0 gf / 25 mm.

6. The surface protective film of claim 1 or 2, wherein the haze of the aforementioned carbamate adhesive layer is less than 3.5%.

7. The surface protective film of claim 1 or 2, wherein after the above-mentioned carbamate adhesive layer is adhered to the glass plate and after 24 hours at 23°C, the residual adhesion rate to the glass plate after peeling from the glass plate at a peel angle of 180 degrees and a peel speed of 0.3 m / min is 80% or more.

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