Adhesive tape for optical members

Abstract

The present application provides an adhesive tape for optical members, which has, in order, a release liner, an adhesive tape for protecting optical members, and a holding tape, and can suppress peeling irregularity when the release liner is peeled, even if the adhesive layer of the adhesive tape for protecting optical members is thin. The adhesive tape for optical members of the present application has an adhesive tape for protecting optical members (I) having an adhesive layer (1) on one side of a base film (1), a holding tape (II) that is directly laminated to the outermost side opposite the adhesive layer (1) of the adhesive tape for protecting optical members (I), and a release liner (III) that is directly laminated to the exposed surface of the adhesive layer (1) of the adhesive tape for protecting optical members (I), two or more of the adhesive tape for protecting optical members (I) are arranged and laminated with a gap on one of the holding tapes (II), the thickness of the adhesive layer (1) is less than 25 μm, and at least one of the corners formed by the opposite sides of two of the adhesive tape for protecting optical members (I) adjacent across the gap is a chamfered corner.

Description

Technical Field

[0001] This invention relates to adhesive tape for optical components. Background Technology

[0002] An adhesive tape for optical components, composed of multiple sheets, is known to be used to secure two or more adhesive tapes for optical component protection to an adherend without misalignment. This is achieved by using a retaining strip with gaps to hold the back side (opposite to the adhesive layer) of the adhesive tapes, and by using a release liner to protect the exposed adhesive layer of the adhesive tapes from damage. Such adhesive tapes for optical components are used as described below.

[0003] First, peel off one release liner from the exposed surface of the adhesive layer of the adhesive tape protecting two or more optical components. Next, while holding the two or more adhesive tapes protecting the optical components in place with a retaining strip, attach them to the substrate while aligning them with the substrate. Then, peel off the retaining strip, resulting in a substrate with two or more adhesive tapes protecting the optical components attached to the desired substrate.

[0004] Here, in the stage before attaching the optical component to the substrate using adhesive tape, when peeling the release liner from the adhesive tape, the peel force between the adhesive tape and the release liner, and the adhesive force between the adhesive tape and the retaining tape, must be properly adjusted to prevent peeling between the adhesive tape and the retaining tape. On the other hand, in the stage after peeling the release liner from the adhesive tape and attaching it to the substrate, when peeling the retaining tape from the adhesive tape, the adhesive force between the adhesive tape and the substrate, and the peel force between the adhesive tape and the retaining tape, must be properly adjusted to prevent damage to the substrate. In the design of the optical component adhesive tape, the adhesive layer of the adhesive tape must be meticulously designed to properly adjust the adhesive and peel forces as described above.

[0005] Recently, there has been a trend towards thinner object components and products using adhesive tapes for optical components, which in turn requires thinner adhesive layers in adhesive tapes for protecting optical components.

[0006] However, if the adhesive layer of the adhesive tape for protecting optical components is thinned, there is a risk of peeling abnormality as described below, in which several of the two or more adhesive tapes for protecting optical components held by the retaining tape peel off from the retaining tape while still attached to the retaining tape when the release liner is peeled off.

[0007] Existing technical documents

[0008] Patent documents

[0009] Patent Document 1: Japanese Patent Application Publication No. 2017-142375

[0010] Patent Document 2: Japanese Patent Application Publication No. 2017-212038

[0011] Patent Document 3: Japanese Patent Application Publication No. 2017-219843 Summary of the Invention

[0012] The problem that the invention aims to solve

[0013] The objective of this invention is to provide an adhesive tape for optical components having a release liner, an adhesive tape for protecting optical components, and a retaining tape in sequence, wherein even if the adhesive layer of the adhesive tape for protecting optical components is thin, peeling abnormalities can be suppressed when the release liner is peeled off.

[0014] Problem Solving Methods

[0015] The adhesive tape for optical components according to embodiments of the present invention has:

[0016] An optical component protective adhesive tape (I) having an adhesive layer (1) on one side of a substrate film (1), an outermost retaining tape (II) directly laminated on the opposite side of the adhesive layer (1) of the optical component protective adhesive tape (I), and

[0017] A release liner (III) is directly laminated onto the exposed surface of the adhesive layer (1) of the adhesive tape (I) for protecting the optical component.

[0018] On one retaining tape (II), two or more adhesive tapes (I) for protecting the optical component are stacked in a spaced arrangement.

[0019] The thickness of the adhesive layer (1) is less than 25 μm.

[0020] At least one of the corners formed on the opposite sides of the two adjacent adhesive tapes (I) protecting the optical components that sandwich the gap is a chamfered portion.

[0021] In one embodiment, the chamfered portion is surface C, and the chamfering amount of the chamfered portion is C 0.05mm or more.

[0022] In one embodiment, the chamfered portion is an R-surface, and the chamfering amount of the chamfered portion is R 0.05mm or more.

[0023] In one embodiment, when the adhesive tape is used to peel the release liner (III) from the optical component in an environment with a temperature of 23°C and a humidity of 50%RH, the peeling force A is less than the adhesive force B when the retaining tape (II) is peeled off.

[0024] In one embodiment, the adhesive constituting the adhesive layer (1) has a storage modulus G' of 5.0 × 10⁻⁶ at 23°C. 5 Below Pa.

[0025] In one embodiment, among the two or more adhesive tapes (I) for protecting the optical component that are stacked along the length direction of the aforementioned retaining tape (II), at least one of the corners formed on the side surfaces at both ends in the length direction is a chamfered portion.

[0026] The effects of the invention

[0027] According to the present invention, an adhesive tape for optical components can be provided having a release liner, an adhesive tape for protecting optical components, and a retaining tape in sequence, wherein even if the adhesive layer of the adhesive tape for protecting optical components is thin, peeling abnormalities when peeling off the release liner can be suppressed. Attached Figure Description

[0028] Figure 1 This is a cross-sectional schematic diagram of one embodiment of the adhesive tape for optical components of the present invention.

[0029] Figure 2 This is a top view schematic diagram showing several embodiments in which two or more adhesive tapes (I) for protecting optical components are stacked on a retaining tape (II) in a spaced arrangement.

[0030] Figure 3 This is a top view of one embodiment of the laminate after the release liner (III) of the optical component of the present invention has been peeled off with adhesive tape from the adhesive layer (1) side.

[0031] Figure 4 This is a perspective schematic diagram showing several embodiments of corners and chamfers that may be formed on the side of the adhesive tape (I) for protecting optical components.

[0032] Symbol Explanation

[0033] 1000 adhesive tapes for optical components

[0034] Adhesive tapes for protecting optical components (I) 100, 101, 102, 103

[0035] Retaining band (II) 200

[0036] Adhesive layer (1) 11

[0037] Substrate film (1) 12

[0038] Adhesive layer (2) 21

[0039] Substrate film (2) 22

[0040] Release liner (III) 30

[0041] gap L

[0042] Corner 1a, 1b, 1c, 1d, 2a, 2b, 2c, 2d

[0043] Chamfered part 1Ca, 1Cb

[0044] Surface 10

[0045] Back 20

[0046] Side view 40, 50, 60, 70 Detailed Implementation

[0047] In this specification, "(meth)acrylic acid" means at least one selected from acrylic acid and methacrylic acid, "(meth)acrylate" means at least one selected from acrylate and methacrylate, and "(meth)acryloyl" means at least one selected from acryloyl and methacryloyl.

[0048] 《A. Adhesive Tape for Optical Components》

[0049] The optical component adhesive tape of the present invention comprises: an optical component protective adhesive tape (I) having an adhesive layer (1) on one side of a substrate film (1), an outermost retaining tape (II) directly laminated on the opposite side of the adhesive layer (1) of the optical component protective adhesive tape (I), and a release liner (III) directly laminated on the exposed surface of the adhesive layer (1) of the optical component protective adhesive tape (I). Two or more of the optical component protective adhesive tapes (I) are laminated on one retaining tape (II) in a spaced arrangement.

[0050] In the adhesive tape for optical components according to embodiments of the present invention, the retaining tape (II) typically has an adhesive layer (2) on one side of the substrate film (2).

[0051] Therefore, in a representative embodiment of the optical component adhesive tape of the present invention, an optical component protective adhesive tape (I) having an adhesive layer (1) on one side of a substrate film (1) and a retaining tape (II) having an adhesive layer (2) on one side of a substrate film (2) are directly stacked. The outermost side of the adhesive layer (1) of the optical component protective adhesive tape (I) and the adhesive layer (2) are directly stacked. A release liner (III) is directly stacked on the exposed surface of the adhesive layer (1) of the optical component protective adhesive tape (I). In this case, two or more optical component protective adhesive tapes (I) are stacked on one retaining tape (II) in an arrangement with gaps.

[0052] The optical component adhesive tape of the present invention is described above. To explain it more simply, the optical component adhesive tape is a laminate having a release liner (III), an adhesive layer (1), a substrate film (1), an adhesive layer (2), and a substrate film (2) in sequence. The part with the fewest number of layers has 3 or more layers, and the part with the most number of layers has 5 or more layers. The adhesive layer (1) and the substrate film (1) are constituent elements of the optical component protective adhesive tape (I), and the adhesive layer (2) and the substrate film (2) are constituent elements of the retaining tape (II). The outermost side of the adhesive layer (1) of the optical component protective adhesive tape (I) is directly laminated with the adhesive layer (2). The release liner (III) is directly laminated on the exposed surface of the adhesive layer (1). Two or more optical component protective adhesive tapes (I) are laminated on one retaining tape (II) in a spaced arrangement.

[0053] In the embodiments of the present invention, the release liner (III), adhesive layer (1), substrate film (1), adhesive layer (2), and substrate film (2) in the optical component adhesive tape can be formed by only one layer or by two or more layers.

[0054] The adhesive tape for optical components according to embodiments of the present invention, as long as it has the above-described configuration, may also have any other suitable layers without impairing the effects of the present invention. There may be only one type of other layer, or there may be two or more types. The total number of other layers may be only one layer, or there may be two or more layers. Examples of other layers include, for example, the antistatic layer described later.

[0055] The number of layers in the portion of the optical component adhesive tape with the fewest layers in the embodiments of the present invention is preferably 3 to 8 layers, more preferably 3 to 6 layers, further preferably 3 to 5 layers, particularly preferably 3 to 4 layers, and most preferably 3 layers, depending on the number of the other layers mentioned above.

[0056] The number of layers in the portion of the adhesive tape for the optical component with the most layers in the embodiments of the present invention is preferably 5 to 10 layers, more preferably 5 to 8 layers, further preferably 5 to 7 layers, particularly preferably 5 to 6 layers, and most preferably 5 layers, depending on the number of the other layers mentioned above.

[0057] One embodiment of the adhesive tape for optical components of the present invention is as follows: Figure 1 As shown, in the optical component adhesive tape 1000, the release liner (III) 30, adhesive layer (1) 11, substrate film (1) 12, adhesive layer (2) 21, and substrate film (2) 22 are sequentially and directly stacked together. The adhesive layer (1) 11 and the substrate film (1) 12 constitute the optical component protective adhesive tape (I) 100, and the adhesive layer (2) 21 and the substrate film (2) 22 constitute the retaining tape (II) 200. Two or more optical component protective adhesive tapes (I) are stacked on one retaining tape (II) 200 in a spaced arrangement. Figure 1 In the embodiment, two adhesive tapes (I) 101 and 102 are used to protect the optical components.

[0058] The shape of the retaining strip (II) can be any suitable shape without impairing the effects of the invention, as long as it is a strip with thickness (also called a sheet). A representative example of such a shape is one in which the length direction and width direction, which are substantially orthogonal to each other, are respectively the long side and the short side.

[0059] The shape of the adhesive tape (I) for protecting optical components can be any suitable shape without impairing the effects of the present invention, as long as it is a strip (also called a sheet) with thickness. As such a shape, any suitable shape can be adopted corresponding to the shape of the object being adhered to. A representative example of such a shape is one where the length and width directions, which are substantially orthogonal to each other, are respectively the long and short sides.

[0060] The two or more adhesive tapes (I) for protecting optical components in the optical component adhesive tape of the present invention can be of the same size or at least two can be of different sizes.

[0061] In two or more of the adhesive tapes (I) for protecting optical components, the interval L between two adjacent adhesive tapes (I) for protecting optical components with a gap is preferably 0.1 mm to 5.0 mm, more preferably 0.2 mm to 3.0 mm, further preferably 0.3 mm to 2.0 mm, particularly preferably 0.5 mm to 1.5 mm, and most preferably 0.7 mm to 1.5 mm.

[0062] In the optical component adhesive tape of the embodiment of the present invention, there may be two or more optical component protective adhesive tapes (I) stacked on a retaining tape (II) in an arrangement with gaps.

[0063] In the optical component adhesive tape of the embodiments of the present invention, typically, at least two of the two or more optical component protective adhesive tapes (I) stacked on a retaining tape (II) in a gapped arrangement are arranged along the length direction of the retaining tape (II). When there are two optical component protective adhesive tapes (I) stacked on a retaining tape (II) in a gapped arrangement, as... Figure 2 As shown in the top view of (a), two optical component protective adhesive tapes (I) 101 and 102 are stacked with gaps along the length of the retaining tape (II) 200 on one retaining tape (II). In the case where there are three optical component protective adhesive tapes (I) stacked with gaps on one retaining tape (II), the three optical component protective adhesive tapes (I) 101, 102, and 103 on one retaining tape (II) 200 can be, for example, as shown in the diagram. Figure 2 The configuration shown in the top view diagram (b) can also be as follows: Figure 2 (c) shows the configuration as illustrated in the top view.

[0064] In the adhesive tape for optical components according to embodiments of the present invention, the thickness of the adhesive layer (1) is thin, typically less than 30 μm, preferably 28 μm or less, more preferably 26 μm or less, further preferably 21 μm or less, and particularly preferably 16 μm or less. The lower limit of the thickness of the adhesive layer (1) is preferably 5 μm or more, more preferably 8 μm or more, further preferably 10 μm or more, and particularly preferably 12 μm or more. When the thickness of the adhesive layer (1) is within the above range, the required adhesive performance of the adhesive layer (1) can be maintained, and the thinning of the target component and target product using the adhesive tape for optical components according to embodiments of the present invention can be achieved.

[0065] In the adhesive tape for optical components according to embodiments of the present invention, the release liner (III), adhesive layer (1), substrate film (1), adhesive layer (2), and substrate film (2) may each have an antistatic layer on at least one side.

[0066] In the optical component adhesive tape of the embodiments of the present invention, the optical component protective adhesive tape (I) may have an antistatic layer on at least one side.

[0067] In the adhesive tape for optical components according to embodiments of the present invention, the retaining tape (II) may have an antistatic layer on at least one side.

[0068] In the adhesive tape for optical components according to embodiments of the present invention, the adhesive layer (1) may contain a conductive component. The conductive component may be only one type or may be two or more types.

[0069] In the adhesive tape for optical components according to embodiments of the present invention, the adhesive layer (2) may contain a conductive component. The conductive component may be only one type or may be two or more types.

[0070] In the optical component adhesive tape of the embodiment of the present invention, at least one of the corners formed on the opposite sides of two adjacent optical component protective adhesive tapes (I) that are sandwiched between gaps is a chamfered portion. Figure 3 This is a top view of one embodiment of the laminate after the release liner (III) of the optical component is peeled off with adhesive tape from the adhesive layer (1) side. Figure 3 In the middle, two adhesive tapes (I) 101 and 102 for protecting optical components are stacked on a retaining tape (II) 200 in a gapped arrangement. Figure 3 In the middle, two optical component protective adhesive tapes (I) 101 and 102 are adjacent to each other with a gap between them. The optical component protective adhesive tape (I) 101 has corner portions 1a, 1b, 1c and 1d on its side, and the optical component protective adhesive tape (I) 102 has corner portions 2a, 2b, 2c and 2d on its side. Figure 3 In these corners, corners 1a, 1b, 2c, and 2d correspond to corners formed on the opposite sides of the adhesive tapes (I) 101 and 102 used to protect the two optical components. Therefore, in Figure 3 In the case of the two optical component protective adhesive tapes (I) 101, 102, at least one of the corners 1a, 1b, 2c, 2d formed on opposite sides is a chamfer.

[0071] As described above, conventionally, if the adhesive layer of the adhesive tape for protecting optical components is thinned, when the release liner is peeled off, an abnormal peeling phenomenon is observed, where several of the two or more adhesive tapes for protecting optical components held by the retaining tape peel off from the retaining tape in the form of being attached to the release liner, leading to serious problems such as reduced yield. In the adhesive tape for optical components according to the embodiment of the present invention, by making at least one of the corners formed on the opposite sides of two adjacent adhesive tapes (I) for protecting optical components with a gap chamfered, when the release liner (III) is peeled off, two or more adhesive tapes (I) for protecting optical components stacked on a retaining tape (II) in a gapped arrangement can be reliably peeled off at the interface between the release liner (III) and the adhesive tapes (I) while being well held on the retaining tape (II). This is because, by making at least one of the corners formed on the opposite sides of the two adjacent optical component protective adhesive strips (I) with the gap chamfered, when the release liner (III) is peeled off, the force that causes the release liner (III) to detach from the optical component protective adhesive strip (I) and the force that causes the optical component protective adhesive strip (I) to detach from the retaining strip (II) can act in a proper balance, thus suppressing the occurrence of previous peeling abnormalities.

[0072] exist Figure 3 In the case of the two adhesive tapes (I) 101 and 102 for protecting optical components, the length direction and width direction are respectively orthogonal to each other as the long side and the short side (rectangular shape). Therefore, each has 4 corners on the side. However, if the adhesive tape (I) for protecting optical components is not rectangular as described above, the number of corners may be less than 4 or more than 5.

[0073] The shape of the chamfer can be any suitable shape without impairing the effects of the invention. From the perspective of further demonstrating the effects of the invention, the chamfer is preferably selected from at least one of the C-surface and the R-surface.

[0074] When the chamfered portion is a C-surface, from the perspective of further demonstrating the effects of the present invention, the chamfering amount of the chamfered portion is preferably C 0.05mm or more, more preferably C 0.05mm to C5mm, even more preferably C 0.1mm to C1mm, and particularly preferably C 0.15mm to C 0.5mm.

[0075] When the chamfered portion is an R-shaped surface, from the perspective of further demonstrating the effects of the present invention, the chamfering amount of the chamfered portion is preferably R 0.05 mm or more, more preferably R 0.05 mm to R5 mm, even more preferably R 0.1 to R1 mm, and particularly preferably R 0.15 mm to R 0.5 mm.

[0076] Figure 4 This is a perspective schematic diagram showing several embodiments of corners and chamfers that may be formed on the side of the adhesive tape (I) for protecting optical components.

[0077] Figure 4 (a) shows an adhesive tape (I) 101 for protecting optical components with four corners 1a, 1b, 1c, and 1d. Figure 4 In (a), the adhesive tape (I) 101 for protecting optical components has a surface 10, a back surface 20, and sides 40, 50, 60, and 70. Sides 40 and 50 form corner 1a, side 50 and 60 form corner 1b, side 60 and 70 form corner 1c, and side 70 and 40 form corner 1d. Figure 4 In (a), none of the four corners 1a, 1b, 1c, and 1d were chamfered.

[0078] Figure 4 (b) is... Figure 4 (a) The corner portions 1a and 1b of the adhesive tape (I) 101 for protecting optical components shown in (a) are chamfered on the C surface, and it has chamfered portion 1Ca, chamfered portion 1Cb, corner portion 1c and corner portion 1d.

[0079] Figure 4 (c) is correct. Figure 4 (a) The corner portions 1a and 1b of the adhesive tape (I) 101 for protecting optical components shown in (a) are chamfered with R-surface, and it has chamfered portion 1Ra, chamfered portion 1Rb, corner portion 1c and corner portion 1d.

[0080] In the optical component adhesive tape of the embodiment of the present invention, from the viewpoint of further demonstrating the effects of the present invention, it is preferable that at least one of the corners formed on the side surfaces at both ends in the length direction of two or more optical component protective adhesive tapes (I) stacked along the length direction of one retaining tape (II) is a chamfered portion. This corner formed on the side surfaces at both ends in the length direction is, for example, in... Figure 3 In the illustrated embodiment, corners 1c, 1d, 2a, and 2b correspond to the corners of the two optical component protective adhesive tapes (I) 101 and 102. If at least one of the corners formed on the sides at both ends of the sides of two or more optical component protective adhesive tapes (I) stacked along the length direction of one retaining tape (II) is a chamfer, then when the release liner (III) is peeled off, the force that causes the release liner (III) to detach from the optical component protective adhesive tape (I) and the force that causes the optical component protective adhesive tape (I) to detach from the retaining tape (II) can act in a proper balance, which can further suppress the occurrence of previous peeling abnormalities.

[0081] In the adhesive tape for optical components according to embodiments of the present invention, the peel force A when peeling the release liner (III) in an environment with a temperature of 23°C and a humidity of 50% RH is preferably 0.15 N / 25 mm or less, more preferably 0.001 N / 25 mm to 0.10 N / 25 mm, further preferably 0.005 N / 25 mm to 0.07 N / 25 mm, and particularly preferably 0.01 N / 25 mm to 0.05 N / 25 mm. By adjusting the peel force A to the above range, peeling is less likely to occur between the adhesive tape for protecting the optical component and the retaining tape when peeling the release liner from the adhesive tape for optical components. Details regarding the method for measuring the peel force A will be described later.

[0082] In the adhesive tape for optical components according to embodiments of the present invention, the adhesive force B when peeling the retaining tape (II) in an environment with a temperature of 23°C and a humidity of 50% RH is preferably 1.00 N / 25 mm or less, more preferably 0.01 N / 25 mm to 0.50 N / 25 mm, further preferably 0.02 N / 25 mm to 0.30 N / 25 mm, and particularly preferably 0.02 N / 25 mm to 0.10 N / 25 mm. By adjusting the adhesive force B to the above range, when it is below the upper limit, the retaining tape can be peeled off from the adhesive tape for optical components that has been peeled from the release liner and attached to the adhered object without causing damage to the adhered object, and when it is above the lower limit, unintentional peeling due to handling can be prevented. In addition, details of the method for measuring the adhesive force B will be described later.

[0083] In the optical component adhesive tape of the embodiments of the present invention, it is even more preferable that, in terms of the peel force A and the adhesive force B, the peel force A is less than the adhesive force B. By adjusting the peel force A to be less than the adhesive force B, when peeling the release liner from the optical component adhesive tape, peeling is less likely to occur between the optical component protective adhesive tape and the retaining tape. Furthermore, when peeling the retaining tape from the optical component adhesive tape that has peeled off the release liner and attached it to the adhered object, it is more likely to avoid damaging the adhered object.

[0084] In the adhesive tape for optical components according to an embodiment of the present invention, the storage modulus G' of the adhesive constituting the adhesive layer (1) at 23°C is preferably 5.0 × 10⁻⁶. 5 Pa or less, more preferably 1.0 × 10 Pa 4 Pa ~ 3.0 × 10 5 Pa, more preferably 1.0 × 10 4 Pa ~ 2.0 × 10 5 Pa, preferably 1.0 × 10 4 Pa ~ 1.0 × 10 5Pa. When the storage modulus G' of the adhesive constituting the adhesive layer (1) is within the above range at 23°C, the effects of the present invention can be further demonstrated.

[0085] The total light transmittance of the adhesive tape for optical components according to embodiments of the present invention is preferably 20% or more, more preferably 30% to 100%, further preferably 50% to 100%, particularly preferably 83% to 100%, and most preferably 85% to 100%. The method for measuring the total light transmittance described above will be described later.

[0086] The haze of the adhesive tape for optical components according to embodiments of the present invention is preferably 20% or less, more preferably 0% to 20%, further preferably 0% to 15%, particularly preferably 0% to 12%, and most preferably 0% to 10%. The method for measuring the haze described above will be described later.

[0087] The adhesive tape for optical components according to embodiments of the present invention can be used in various applications. From the viewpoint of being able to more effectively utilize the effects of the present invention, the adhesive tape for optical components according to embodiments of the present invention is preferably an adhesive tape for bonding folded components and roll-up components. In this case, a representative example of a folded component or roll-up component is an OLED.

[0088] A-1. Release Liner (III)

[0089] Regarding the thickness of the release liner (III), from the perspective of further demonstrating the effects of the present invention, it is preferably 1μm to 300μm, more preferably 10μm to 200μm, even more preferably 20μm to 150μm, particularly preferably 35μm to 100μm, and most preferably 50μm to 80μm. If the thickness of the release liner (III) is too small compared to the above range, there is a risk of reduced curl suppression effect. If the thickness of the release liner (III) is too large compared to the above range, there is a risk that the adhesive tape for optical components according to the embodiments of the present invention may easily lift up during bending.

[0090] The release liner (III) comprises a resin substrate film (IIIa).

[0091] Examples of resin-based films (IIIa) include: plastic films made from polyester resins such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT); plastic films made from olefin resins such as polyethylene (PE), polypropylene (PP), polymethylpentene (PMP), ethylene-propylene copolymer, and ethylene-vinyl acetate copolymer (EVA) with α-olefins as monomers; plastic films made from polyvinyl chloride (PVC); plastic films made from vinyl acetate resins; and plastic films made from polycarbonate resins. Plastic films formed from polycarbonate (PC); plastic films formed from polyphenylene sulfide (PPS); plastic films formed from amide resins such as polyamide (nylon) and fully aromatic polyamide (aromatic polyamide); plastic films formed from polyimide resins; plastic films formed from polyether ether ketone (PEEK); plastic films formed from olefin resins such as polyethylene (PE) and polypropylene (PP); plastic films formed from fluorinated resins such as polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride, tetrafluoroethylene-hexafluoropropylene copolymer, and chlorofluoroethylene-vinylidene fluoride copolymer; and so on.

[0092] The resin-based film (IIIa) can be a single layer or two or more layers. The resin-based film (IIIa) can also be a stretched film.

[0093] The resin substrate film (IIIa) can be subjected to surface treatment. Examples of surface treatments include: corona treatment, plasma treatment, chromic acid treatment, ozone exposure, flame exposure, high voltage electric shock exposure, ionization radiation treatment, and coating treatment using a primer.

[0094] Without impairing the effects of the present invention, any suitable additives may be included in the resin substrate film (IIIa).

[0095] To improve peelability from the adhesive layer (1), the release liner (III) may have a release layer (IIIb). In the case where the release liner (III) has a release layer (IIIb), typically, the release layer (IIIb) side is directly laminated to the adhesive layer (1).

[0096] The forming material of the release layer (IIIb) can be any suitable forming material without impairing the effects of the present invention. Examples of such forming materials include: silicone-based release agents, fluorinated release agents, long-chain alkyl release agents, fatty acid amide release agents, etc. Among these, silicone-based release agents are preferred. The release layer (IIIb) can be formed in the form of a coating layer.

[0097] The thickness of the release layer (IIIb) can be any suitable thickness depending on the purpose, without compromising the effectiveness of the present invention. Preferably, the thickness is 10 nm to 2000 nm, more preferably 10 nm to 1500 nm, even more preferably 10 nm to 1000 nm, and particularly preferably 10 nm to 500 nm.

[0098] The release layer (IIIb) can be a single layer or two or more layers.

[0099] Examples of silicone-based release layers include addition-reactive silicone resins. Specific examples of addition-reactive silicone resins include: Shin-Etsu Chemical Industry's KS-774, KS-775, KS-778, KS-779H, KS-847H, and KS-847T; Toshiba Silicones' TPR-6700, TPR-6710, and TPR-6721; Toray Dow Corning's SD7220 and SD7226; and so on. The coating amount (after drying) of the silicone-based release layer is preferably 0.01 g / m². 2 ~2g / m 2 More preferably 0.01 g / m 2 ~1g / m 2 Further preferred is 0.01 g / m 2 ~0.5g / m 2 .

[0100] The release layer (IIIb) can be formed, for example, by applying the aforementioned forming material onto any suitable layer using existing known coating methods such as reverse gravure coating, bar coating, or die coating, and then performing heat treatment, typically at around 120–200°C, to cure it. Alternatively, heat treatment and irradiation with active energy rays such as ultraviolet light can be combined as needed.

[0101] The release liner (III) may have an antistatic layer (IIIc).

[0102] The thickness of the antistatic layer (IIIc) can be any suitable thickness without compromising the effects of the present invention. Preferably, the thickness is 1 nm to 1000 nm, more preferably 5 nm to 900 nm, even more preferably 7.5 nm to 800 nm, and particularly preferably 10 nm to 700 nm.

[0103] The antistatic layer (IIIc) can be a single layer or two or more layers.

[0104] As the antistatic layer (IIIc), any suitable antistatic layer can be used without compromising the effectiveness of the present invention, as long as it can provide an antistatic effect. Preferably, such an antistatic layer is formed by applying a conductive coating liquid containing a conductive polymer onto any suitable substrate layer. Specifically, for example, it is an antistatic layer formed by applying a conductive coating liquid containing a conductive polymer onto a resin substrate film (IIIa). Specific coating methods include roller coating, bar coating, and gravure coating.

[0105] As the conductive polymer, any suitable conductive polymer can be used without impairing the effects of the present invention. Examples of such conductive polymers include conductive polymers doped with polyanions in π-conjugated conductive polymers. Examples of π-conjugated conductive polymers include chain-like conductive polymers such as polythiophene, polypyrrole, polyaniline, and polyacetylene. Examples of polyanions include polystyrene sulfonic acid, polyisoprene sulfonic acid, polyvinyl sulfonic acid, polyallyl sulfonic acid, polyethyl sulfonic acid, and polymethacryloylcarboxylic acid. The conductive polymer can be only one type or two or more types.

[0106] One embodiment of the release liner (III) comprises a resin substrate film (IIIa) and a release layer (IIIb) in sequence. Typically, this embodiment consists of a resin substrate film (IIIa) and a release layer (IIIb).

[0107] One embodiment of the release liner (III) comprises, in sequence, a resin substrate film (IIIa), an antistatic layer (IIIc), and a release layer (IIIb). Typically, this embodiment consists of a resin substrate film (IIIa), an antistatic layer (IIIc), and a release layer (IIIb).

[0108] Another embodiment of the release liner (III) comprises, in sequence, an antistatic layer (IIIc), a resin substrate film (IIIa), an antistatic layer (IIIc), and a release layer (IIIb). Typically, this embodiment consists of an antistatic layer (IIIc), a resin substrate film (IIIa), an antistatic layer (IIIc), and a release layer (IIIb).

[0109] A-2. Adhesive Layer (1)

[0110] The adhesive layer (1) may be any suitable adhesive layer without impairing the effects of the present invention. The adhesive layer (1) may be only one layer or may be two or more layers.

[0111] From the perspective of further demonstrating the effects of the present invention, the thickness of the adhesive layer (1) is typically less than 30 μm, preferably 28 μm or less, more preferably 26 μm or less, further preferably 21 μm or less, and particularly preferably 16 μm or less. The lower limit of the thickness of the adhesive layer (1) is preferably 5 μm or more, more preferably 8 μm or more, further preferably 10 μm or more, and particularly preferably 12 μm or more. When the thickness of the adhesive layer (1) is within the above range, the required adhesive performance of the adhesive layer (1) can be maintained, and the thinning of the target component and target product using the adhesive tape for optical components according to the embodiments of the present invention can be achieved.

[0112] The adhesive layer (1) is preferably formed from at least one selected from acrylic adhesives (1), urethane adhesives (1), rubber adhesives (1), and silicone adhesives (1). From the viewpoint of being able to further demonstrate the effects of the present invention, the adhesive layer (1) is more preferably an acrylic adhesive (1).

[0113] The adhesive layer (1) can be formed by any suitable method. Examples of such methods include: applying an adhesive composition (selected from at least one of acrylic adhesive composition (1), urethane adhesive composition (1), rubber adhesive composition (1), and silicone adhesive composition (1)) that forms the adhesive constituting the adhesive layer (1) onto any suitable substrate (e.g., a substrate film (1)), heating / drying as needed, and curing it as needed to form the adhesive layer on the substrate. Examples of such coating methods include: gravure roller coating, reverse roller coating, licking coating, dip roller coating, wire bar coating, doctor blade coating, air knife coating, spraying, comma coating, direct coating, and roller brush coating.

[0114] The adhesive layer (1) may also contain other components (1). These other components (1) may be only one type or two or more. Any suitable other component (1) may be used as the other component (1) without impairing the effects of the present invention. Examples of such other components (1) include: other polymer components, crosslinking accelerators, crosslinking catalysts, silane coupling agents, tackifying resins (rosin derivatives, polyterpene resins, petroleum resins, oil-soluble phenols, etc.), anti-aging agents, inorganic fillers, organic fillers, metal powders, colorants (pigments, dyes, etc.), foils, ultraviolet absorbers, antioxidants, light stabilizers, chain transfer agents, plasticizers, softeners, surfactants, conductive components, stabilizers, surface lubricants, leveling agents, corrosion inhibitors, heat stabilizers, polymerization inhibitors, lubricants, solvents, catalysts, etc.

[0115] As other components (1), a conductive component can be representatively mentioned. There may be only one conductive component, or there may be two or more. Any suitable conductive component can be used as a conductive component without impairing the effects of the present invention. Examples of such conductive components include: ionic liquids, ionic conductive polymers, ionic conductive fillers, conductive polymers, etc.

[0116] <A-2-1. Acrylic Adhesives (1)>

[0117] The adhesive layer (1) is preferably formed of an acrylic adhesive (1).

[0118] The acrylic adhesive (1) is formed from the acrylic adhesive composition (1).

[0119] The acrylic adhesive composition (1) comprises a (meth)acrylic resin (1). The (meth)acrylic resin (1) may be only one type or may be two or more types.

[0120] The proportion of (meth)acrylic resin (1) in the acrylic adhesive composition (1) is preferably 60% to 99.9% by weight, more preferably 65% ​​to 99.9% by weight, further preferably 70% to 99.9% by weight, particularly preferably 75% to 99.9% by weight, and most preferably 80% to 99.9% by weight, in terms of solid content.

[0121] As the (meth)acrylic resin (1), any suitable (meth)acrylic resin may be used within the scope of not impairing the effects of the present invention.

[0122] From the perspective of further demonstrating the effects of the present invention, the weight-average molecular weight of the (meth)acrylic resin (1) is preferably 300,000 to 2,500,000, more preferably 350,000 to 2,000,000, further preferably 400,000 to 1,800,000, and particularly preferably 500,000 to 1,500,000.

[0123] The acrylic adhesive composition (1) may also contain a crosslinking agent. By using a crosslinking agent, the cohesive strength of the acrylic adhesive (1) can be improved, and the effects of the present invention can be further demonstrated. There may be only one type of crosslinking agent or two or more types.

[0124] In addition to polyfunctional isocyanate crosslinking agents, epoxy crosslinking agents, melamine crosslinking agents, and peroxide crosslinking agents, other crosslinking agents that can be cited include urea crosslinking agents, metal alkoxide crosslinking agents, metal chelate crosslinking agents, metal salt crosslinking agents, and carbodiimide crosslinking agents. Azoline crosslinking agents, aziridine crosslinking agents, amine crosslinking agents, etc. Among these, from the viewpoint of further demonstrating the effects of the present invention, at least one type selected from polyfunctional isocyanate crosslinking agents and epoxy crosslinking agents is preferred.

[0125] Examples of polyfunctional isocyanate crosslinking agents include: lower aliphatic polyisocyanates such as 1,2-ethylene diisocyanate, 1,4-butylene diisocyanate, and 1,6-hexamethylene diisocyanate; alicyclic polyisocyanates such as cyclopentylene diisocyanate, cyclohexylene diisocyanate, isophorone diisocyanate, hydrogenated toluene diisocyanate, and hydrogenated xylene diisocyanate; and aromatic polyisocyanates such as 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 4,4'-diphenylmethane diisocyanate, and phenylenediamine diisocyanate. Examples of commercially available multifunctional isocyanate crosslinking agents include: trimethylolpropane / toluene diisocyanate adduct (manufactured by Nippon Polyurethanes Co., Ltd., trade name "CORONATE L"), trimethylolpropane / hexamethylene diisocyanate adduct (manufactured by Nippon Polyurethanes Co., Ltd., trade name "CORONATE HL"), trade name "CORONATE HX" (Nippon Polyurethanes Co., Ltd.), and trimethylolpropane / phenylenediamine diisocyanate adduct (manufactured by Mitsui Chemicals Co., Ltd., trade name "Takenate 110N").

[0126] As an epoxy crosslinking agent (multifunctional epoxy compound), in addition to examples such as N,N,N',N'-tetraglycidyl-m-xylenediamine, diglycidyl aniline, 1,3-bis(N,N-diglycidylaminomethyl)cyclohexane, 1,6-hexanediol diglycidyl ether, neopentyl glycol diglycidyl ether, ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, sorbitol poly... In addition to glycidyl ether, glycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, polyglycerol polyglycidyl ether, sorbitan polyglycidyl ether, trimethylolpropane polyglycidyl ether, diglycidyl adipate, diglycidyl phthalate, triglycidyl tris(2-hydroxyethyl) isocyanurate, resorcinol diglycidyl ether, and bisphenol-S-diglycidyl ether, epoxy resins having two epoxy groups within the molecule can also be cited. As epoxy crosslinking agents, commercially available products such as "TETRAD C" (manufactured by Mitsubishi Gas Chemical Co., Ltd.) can also be cited.

[0127] The crosslinking agent content in the acrylic adhesive composition (1) can be any suitable amount within a range that does not impair the effects of the present invention. As such a content, for example, considering from the aspect that can further demonstrate the effects of the present invention, it is preferably 30 parts by weight or less, more preferably 0.05 parts by weight to 20 parts by weight, further preferably 0.1 parts by weight to 18 parts by weight, particularly preferably 0.5 parts by weight to 15 parts by weight, and most preferably 0.5 parts by weight to 10 parts by weight, relative to the solid content (100 parts by weight) of the (meth)acrylic resin (1).

[0128] The acrylic adhesive composition (1) may contain any other suitable ingredients without impairing the effects of the present invention. Examples of such other ingredients include, for example, polymer components other than (meth)acrylic resin (1), crosslinking accelerators, crosslinking catalysts, silane coupling agents, tackifying resins (rosin derivatives, polyterpene resins, petroleum resins, oil-soluble phenols, etc.), anti-aging agents, inorganic fillers, organic fillers, metal powders, colorants (pigments, dyes, etc.), foils, ultraviolet absorbers, antioxidants, light stabilizers, chain transfer agents, plasticizers, softeners, surfactants, antistatic agents, conductive agents, stabilizers, surface lubricants, leveling agents, corrosion inhibitors, heat stabilizers, polymerization inhibitors, lubricants, solvents, catalysts, etc.

[0129] [A-2-1-1. Preferred Embodiment 1 of (meth)acrylic resin (1)]

[0130] As a preferred embodiment 1 of the (meth)acrylic resin (1), from the viewpoint of being able to further demonstrate the effects of the present invention, it is preferable to form a (meth)acrylic resin (A) by polymerization of a (meth)acrylic alkyl ester containing an alkyl ester portion having 1 to 12 carbon atoms, and a (b)composition (A) selected from at least one of (meth)acrylic ester having an OH group and (meth)acrylic acid.

[0131] As for the (meth)acrylic resin (A), from the perspective of further demonstrating the effects of the present invention, it is preferable to form a (meth)acrylic resin (A) by polymerization of a composition (A) in which an alkyl group comprising an alkyl ester moiety has 1 to 12 carbon atoms as (component a) and contains (meth)acrylic acid but does not contain (meth)acrylic acid having OH groups as (component b). More preferably, it is a (meth)acrylic resin (A) formed by polymerization of a composition (A) in which an alkyl group comprising an alkyl ester moiety has 1 to 8 carbon atoms as (component a) and contains acrylic acid but does not contain (meth)acrylic acid having OH groups as (component b). More preferably, it is a (meth)acrylic resin (A) formed by polymerization of a composition (A) in which an alkyl group comprising an alkyl ester moiety has 1 to 6 carbon atoms as (component a) and contains acrylic acid but does not contain (meth)acrylic acid having OH groups as (component b).

[0132] Component (a) and component (b) can each be a single type or two or more types.

[0133] Alkyl methacrylates (component a) in which the alkyl group has 1 to 12 carbon atoms include, for example: methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, sec-butyl methacrylate, tert-butyl methacrylate, pentyl methacrylate, hexyl methacrylate, heptyl methacrylate, octyl methacrylate, 2-ethylhexyl methacrylate, isooctyl methacrylate, nonyl methacrylate, isononyl methacrylate, decyl methacrylate, isodecyl methacrylate, undecyl methacrylate, dodecyl methacrylate, etc. Among these, from the perspective of further demonstrating the effects of the present invention, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, and 2-ethylhexyl methacrylate are preferred, and methyl acrylate, ethyl acrylate, n-butyl acrylate, and 2-ethylhexyl acrylate are more preferred.

[0134] As at least one of (meth)acrylates and (meth)acrylic acid having an OH group, examples include hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, hydroxybutyl (meth)acrylate, and other (meth)acrylates and (meth)acrylic acid having an OH group. Among these, hydroxyethyl (meth)acrylate and (meth)acrylic acid are preferred from the viewpoint of further demonstrating the effects of the present invention, and hydroxyethyl acrylate and acrylic acid are more preferred.

[0135] Composition (A) may also contain comonomers other than components (a) and (b). The comonomer may be only one type or two or more types. Examples of such comonomers include: alkyl methacrylates in which the alkyl group of the alkyl ester moiety has 1 to 3 carbon atoms; carboxyl-containing monomers such as itaconic acid, maleic acid, fumaric acid, crotonic acid, isocrotonic acid, and their anhydrides (e.g., maleic anhydride, itaconic anhydride, etc., containing anhydride groups), except for (meth)acrylic acid; (meth)acrylamide, N,N-dimethyl (meth)acrylamide, N-hydroxymethyl (meth)acrylamide, N-methoxymethyl (meth)acrylamide, N-butoxymethyl (meth)acrylamide, N-hydroxy... Ethyl (meth)acrylamide and other amide-containing monomers; amino-containing monomers such as aminoethyl (meth)acrylate, dimethylaminoethyl (meth)acrylate, and tert-butylaminoethyl (meth)acrylate; epoxy-containing monomers such as glycidyl (meth)acrylate and methylglycidyl (meth)acrylate; cyano-containing monomers such as acrylonitrile and methacrylonitrile; N-vinyl-2-pyrrolidone, (meth)acryloylmorpholine, N-vinylpiperidinone, N-vinylpiperazine, N-vinylpyrrole, N-vinylimidazolium, vinylpyridine, vinylpyrimidine, and vinyl Monomers containing heterocyclic vinyl groups, such as azoles; monomers containing sulfonic acid groups, such as sodium vinyl sulfonate; monomers containing phosphate groups, such as 2-hydroxyethyl acryloyl phosphate; monomers containing imide groups, such as cyclohexyl maleimide and isopropyl maleimide; monomers containing isocyanate groups, such as 2-methacryloyloxyethyl isocyanate; (meth)acrylates with alicyclic hydrocarbon groups, such as cyclopentyl methacrylate, cyclohexyl methacrylate, and isobornyl methacrylate; (meth)acrylates with aromatic hydrocarbon groups, such as phenyl methacrylate, phenoxyethyl methacrylate, and benzyl methacrylate; vinyl esters, such as vinyl acetate and vinyl propionate; aromatic vinyl compounds, such as styrene and vinyltoluene; olefins and dienes, such as ethylene, butadiene, isoprene, and isobutylene; vinyl ethers, such as vinyl alkyl ethers; vinyl chloride; etc.

[0136] Multifunctional monomers can also be used as comonomers. A multifunctional monomer is a monomer having two or more olefinic unsaturated groups in one molecule. Any suitable olefinic unsaturated group can be used as the olefinic unsaturated group without impairing the effects of the present invention. Examples of such olefinic unsaturated groups include free radical polymerizable functional groups such as vinyl, propenyl, isopropenyl, vinyl ether (ethoxy), and allyl ether (allyloxy). Examples of multifunctional monomers include: hexanediol di(meth)acrylate, butanediol di(meth)acrylate, polyethylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, pentaerythritol di(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, trimethylolpropane tri(meth)acrylate, tetramethylolmethane tri(meth)acrylate, allyl methacrylate, vinyl methacrylate, divinylbenzene, epoxy acrylate, polyester acrylate, and urethane acrylate. Such multifunctional monomers can be one or more types.

[0137] Alkoxyalkyl esters of (meth)acrylate can also be used as comonomers. Examples of alkoxyalkyl esters of (meth)acrylate include: 2-methoxyethyl ester, 2-ethoxyethyl ester, methoxytriethylene glycol ester, 3-methoxypropyl ester, 3-ethoxypropyl ester, 4-methoxybutyl ester, and 4-ethoxybutyl ester. There may be only one alkoxyalkyl ester or two or more.

[0138] From the viewpoint of further demonstrating the effects of the present invention, the content of alkyl methacrylate (a component) with 1 to 12 carbon atoms in the alkyl group of the alkyl ester portion is preferably 30% by weight or more, more preferably 35% to 99% by weight, further preferably 40% to 98% by weight, and particularly preferably 50% to 95% by weight, relative to the total amount of monomer components constituting the (meth)acrylate resin (A).

[0139] From the perspective of further demonstrating the effects of the present invention, the proportion of alkyl methacrylates (component a) in the total amount (100% by weight) of alkyl methacrylates (meth)acrylates (component a) in which the alkyl ester portion has 2 to 12 carbon atoms (preferably 2 to 10, more preferably 2 to 8, and even more preferably 2 to 6) is preferably 30% by weight or more, more preferably 35% to 100% by weight, even more preferably 40% to 100% by weight, and particularly preferably 45% to 100% by weight.

[0140] From the viewpoint of further demonstrating the effects of the present invention, the content of at least one (b component) selected from (meth)acrylates having OH groups and (meth)acrylic acid is preferably 1% or more, more preferably 1% to 30% by weight, further preferably 2% to 20% by weight, and particularly preferably 3% to 15% by weight, relative to the total amount (100% by weight) of monomer components constituting (meth)acrylic resin (A).

[0141] Composition (A) may also contain any other suitable components without impairing the effects of the present invention. Examples of such other components include, for instance, polymerization initiators, chain transfer agents, solvents, etc. The amounts of these other components may be any suitable amounts without impairing the effects of the present invention.

[0142] Polymerization initiators can be selected based on the type of polymerization reaction, such as thermal polymerization initiators or photopolymerization initiators (photoinitiators). There can be only one type of polymerization initiator, or two or more.

[0143] The thermal polymerization initiator is preferably used when obtaining (meth)acrylic resin (A) by solution polymerization. Examples of such thermal polymerization initiators include azo polymerization initiators, peroxide polymerization initiators (e.g., benzoyl peroxide, tert-butyl maleate peroxide, etc.), and redox polymerization initiators. Among these thermal polymerization initiators, the azo initiator disclosed in Japanese Patent Application Publication No. 2002-69411 is particularly preferred. Such azo polymerization initiators are preferred because the decomposition products of the polymerization initiator are unlikely to remain in the (meth)acrylic resin (A) as a component contributing to the generation of gases (exhaust gas) during heating. Examples of azo polymerization initiators include 2,2'-azobisisobutyronitrile (hereinafter, sometimes referred to as AIBN), 2,2'-azobis-2-methylbutyronitrile (hereinafter, sometimes referred to as AMBN), 2,2'-azobis(2-methylpropionic acid) dimethyl ester, and 4,4'-azobis-4-cyanopentanoic acid.

[0144] The photopolymerization initiator is preferably used when obtaining (meth)acrylic resin (A) by polymerization with active energy rays. Examples of photopolymerization initiators include: benzoin ether photopolymerization initiators, acetophenone photopolymerization initiators, α-ol ketone photopolymerization initiators, aromatic sulfonyl chloride photopolymerization initiators, photoactive oxime photopolymerization initiators, benzoin photopolymerization initiators, benzoyl photopolymerization initiators, benzophenone photopolymerization initiators, ketal photopolymerization initiators, thioxanone photopolymerization initiators, etc.

[0145] Examples of benzoin ether-based photopolymerization initiators include: benzoin methyl ether, benzoin ethyl ether, benzoin propyl ether, benzoin isopropyl ether, benzoin isobutyl ether, 2,2-dimethoxy-1,2-diphenylethane-1-one, and anisole methyl ether. Examples of acetophenone-based photopolymerization initiators include: 2,2-diethoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 1-hydroxycyclohexylphenyl ketone, 4-phenoxydichloroacetophenone, and 4-(tert-butyl)dichloroacetophenone. Examples of α-olone-based photopolymerization initiators include: 2-methyl-2-hydroxyphenylacetone and 1-[4-(2-hydroxyethyl)phenyl]-2-methylpropane-1-one. Examples of aromatic sulfonyl chloride-based photopolymerization initiators include: 2-naphthalenesulfonyl chloride. Examples of photoactive oxime photopolymerization initiators include 1-phenyl-1,1-propanedione-2-(o-ethoxycarbonyl)-oxime. Examples of benzoin photopolymerization initiators include benzoin. Examples of benzoyl photopolymerization initiators include benzoyl. Examples of benzophenone photopolymerization initiators include benzophenone, benzoylbenzoic acid, 3,3'-dimethyl-4-methoxybenzophenone, polyvinylbenzophenone, α-hydroxycyclohexylphenyl ketone, etc. Examples of ketal photopolymerization initiators include benzoin dimethyl ether, etc. Examples of thioxanthone photopolymerization initiators include thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-diisopropylthioxanthone, dodecylthioxanthone, etc.

[0146] [A-2-1-2. Preferred Embodiment 2 of (Meth)Acrylic Resin (1)]

[0147] As a preferred embodiment 2 of the (meth)acrylic resin (1), from the viewpoint of being able to further demonstrate the effects of the present invention, it is preferable to form a (meth)acrylic resin (B) by polymerization of a composition (B) containing a (meth)acrylic ester having a cyclic structure in the molecule as a monomer component, and more preferably to form a (meth)acrylic resin (B) by polymerization of a composition (B) containing a (meth)acrylic ester having a cyclic structure in the molecule and an alkyl (meth)acrylic ester having a straight chain or a branched alkyl group as monomer components.

[0148] Intramolecularly cyclic (meth)acrylates (hereinafter sometimes referred to as "cyclic (meth)acrylates") can have any cyclic structure, including aromatic and non-aromatic rings. Examples of aromatic rings include: aromatic carbocyclic rings (e.g., monocyclic carbocyclic rings such as benzene rings, fused carbocyclic rings such as naphthalene rings), and various aromatic heterocyclic rings. Examples of non-aromatic rings include: non-aromatic aliphatic rings (non-aromatic alicyclic rings) (e.g., cyclopentane rings, cyclohexane rings, cycloheptane rings, cyclooctane rings, etc.; cyclohexene rings, etc.); non-aromatic bridged rings (e.g., pinane, pinene, borneol, norborneol, norborneol, etc.; tricyclic or more aliphatic rings such as adamantane (bridged rings)); and non-aromatic heterocyclic rings (e.g., epoxy rings, oxacyclopentane rings, oxacyclobutane rings, etc.).

[0149] Examples of aliphatic hydrocarbon rings with three or more rings (bridged hydrocarbon rings with three or more rings) include: dicyclopentyl, dicyclopentenyl, adamantyl, tricyclopentyl, tricyclopentenyl, etc.

[0150] That is, examples of cyclo(meth)acrylates include: cyclopentyl(meth)acrylate, cyclohexyl(meth)acrylate, cycloheptyl(meth)acrylate, cyclooctyl(meth)acrylate, and other cycloalkyl(meth)acrylates; isobornyl(meth)acrylate and other meth)acrylates having a bicyclic aliphatic hydrocarbon ring; dicyclopentyl(meth)acrylate, dicyclopentoxyethyl(meth)acrylate, tricyclopentyl(meth)acrylate, 1-adamantane(meth)acrylate, 2-methyl-2-adamantane(meth)acrylate, 2-ethyl-2-adamantane(meth)acrylate, and other meth)acrylates having three or more aliphatic hydrocarbon rings; phenyl(meth)acrylate and other aryl(meth)acrylates, phenoxyethyl(meth)acrylate and other aryloxyalkyl(meth)acrylates, benzyl(meth)acrylate and other arylalkyl(meth)acrylates having aromatic rings; and so on. Among these, cyclic (meth)acrylates are preferred, non-aromatic cyclic (meth)acrylates are more preferably cyclohexyl acrylate (CHA), cyclohexyl methacrylate (CHMA), dicyclopentyl acrylate (DCPA), or dicyclopentyl methacrylate (DCPMA), and even more preferably dicyclopentyl acrylate (DCPA) or dicyclopentyl methacrylate (DCPMA).

[0151] The cyclic (meth)acrylate can be one type or two or more types.

[0152] From the viewpoint of being able to further demonstrate the effects of the present invention, the content of cyclic (meth)acrylate is preferably 10% by weight or more, more preferably 20% to 90% by weight, further preferably 30% to 80% by weight, and particularly preferably 40% to 70% by weight, relative to the total amount (100% by weight) of monomer components constituting (meth)acrylate resin (B).

[0153] Examples of alkyl (meth)acrylates having straight or branched alkyl groups include: methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, butyl (meth)acrylate, isobutyl (meth)acrylate, sec-butyl (meth)acrylate, tert-butyl (meth)acrylate, amyl (meth)acrylate, isoamyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, and nonyl (meth)acrylate. Alkyl methacrylates, including esters such as isononyl methacrylate, decyl methacrylate, isodecyl methacrylate, undecyl methacrylate, dodecyl methacrylate, tridecyl methacrylate, tetradecyl methacrylate, pentadecyl methacrylate, hexadecyl methacrylate, heptadecanyl methacrylate, octadecyl methacrylate, nonadecanyl methacrylate, eicosyl methacrylate, and lauryl methacrylate, have an alkyl group having 1 to 20 carbon atoms. Among these, methyl methacrylate (MMA) and lauryl methacrylate are preferred as alkyl methacrylates having a straight chain or branched alkyl group.

[0154] Alkyl (meth)acrylates having straight-chain or branched alkyl groups can be one type or two or more types.

[0155] From the viewpoint of further demonstrating the effects of the present invention, the content of alkyl methacrylates having straight-chain or branched alkyl groups is preferably 10% by weight or more, more preferably 20% to 90% by weight, further preferably 25% to 80% by weight, particularly preferably 30% to 70% by weight, and most preferably 30% to 60% by weight, relative to the total amount of monomer components constituting (meth)acrylate resin (B).

[0156] Composition (B) may also contain comonomers other than alkyl (meth)acrylates containing cyclic (meth)acrylates or having straight-chain or branched alkyl groups. The comonomer may be only one type or may be two or more types. Examples of such comonomers include: 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, methoxytriethylene glycol (meth)acrylate, 3-methoxypropyl (meth)acrylate, 3-ethoxypropyl (meth)acrylate, 4-methoxybutyl (meth)acrylate, 4-ethoxybutyl (meth)acrylate, and other alkoxyalkyl (meth)acrylates; 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, vinyl alcohol, allyl alcohol, and other hydroxyl-containing monomers; (meth)... Acrylamide, N,N-dimethyl(meth)acrylamide, N-hydroxymethyl(meth)acrylamide, N-methoxymethyl(meth)acrylamide, N-butoxymethyl(meth)acrylamide, N-hydroxyethyl(meth)acrylamide and other monomers containing amide groups; amino(meth)acrylate, dimethylamino(meth)acrylate, tert-butylamino(meth)acrylate and other monomers containing amino groups; acrylonitrile, methacrylonitrile and other monomers containing cyano groups; sodium vinyl sulfonate and other monomers containing sulfonic acid groups; 2-hydroxyethylacryloyl phosphate and other monomers containing phosphate groups; 2-methacryloyloxyethyl isocyanate and other monomers containing isocyanate groups; cyclohexylmaleimide, isopropylmaleimide and other monomers containing imide groups; and so on.

[0157] Multifunctional monomers can also be used as comonomers. A multifunctional monomer is a monomer having two or more olefinic unsaturated groups in one molecule. Any suitable olefinic unsaturated group can be used as the olefinic unsaturated group without impairing the effects of the present invention. Examples of such olefinic unsaturated groups include free radical polymerizable functional groups such as vinyl, propenyl, isopropenyl, vinyl ether (ethoxy), and allyl ether (allyloxy). Examples of multifunctional monomers include: hexanediol di(meth)acrylate, butanediol di(meth)acrylate, polyethylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, pentaerythritol di(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, trimethylolpropane tri(meth)acrylate, tetramethylolmethane tri(meth)acrylate, allyl methacrylate, vinyl methacrylate, divinylbenzene, epoxy acrylate, polyester acrylate, and urethane acrylate. Such multifunctional monomers can be one or more types.

[0158] Composition (B) may contain any suitable other components without impairing the effects of the present invention. Examples of such other components include, for instance, polymerization initiators, chain transfer agents, solvents, etc. The amounts of these other components may be any suitable amounts without impairing the effects of the present invention.

[0159] Polymerization initiators can be selected based on the type of polymerization reaction, such as thermal polymerization initiators or photopolymerization initiators (photoinitiators). There can be only one type of polymerization initiator, or two or more.

[0160] As a thermal polymerization initiator and a photopolymerization initiator (photoinitiator), the description in [A-2-1-1. Preferred embodiment 1 of (meth)acrylic resin (1)] can be cited.

[0161] <A-2-2. Carbamate Adhesives (1)>

[0162] As the urethane adhesive (1), any suitable urethane adhesive, such as that known in Japanese Patent Application Publication No. 2017-039859, may be used, without impairing the effects of the present invention. Such a urethane adhesive (1) may be, for example, a urethane adhesive formed from a urethane adhesive composition, wherein the urethane adhesive composition comprises at least one selected from urethane prepolymers and polyols, and a crosslinking agent. The urethane adhesive (1) may be only one type or may contain two or more types. The urethane adhesive (1) may contain any suitable components without impairing the effects of the present invention.

[0163] <A-2-3. Rubber Adhesives (1)>

[0164] As the rubber-based adhesive (1), any suitable rubber-based adhesive, such as that known in Japanese Patent Application Publication No. 2015-074771, may be used, without impairing the effects of the present invention. The rubber-based adhesive (1) may be only one type or may be two or more types. The rubber-based adhesive (1) may contain any suitable components without impairing the effects of the present invention.

[0165] <A-2-4. Organosilicon adhesives (1)>

[0166] As the silicone adhesive (1), any suitable silicone adhesive, such as that known in Japanese Patent Application Publication No. 2014-047280, may be used without impairing the effects of the present invention. The silicone adhesive (1) may be only one type or may be two or more types. The silicone adhesive (1) may contain any suitable components without impairing the effects of the present invention.

[0167] 《A-3. Substrate Film (1)》

[0168] The thickness of the substrate film (1) can be any suitable thickness depending on the purpose, without impairing the effects of the present invention. From the perspective of further demonstrating the effects of the present invention, such a thickness is preferably 20 μm to 500 μm, more preferably 20 μm to 300 μm, even more preferably 20 μm to 200 μm, particularly preferably 20 μm to 100 μm, and most preferably 20 μm to 80 μm.

[0169] The substrate film (1) includes a resin substrate film (1a).

[0170] As for the resin substrate film (1a), the description of the resin substrate film (IIIa) in section A-1. Release Liner (III) can be used.

[0171] The substrate film (1) may have a conductive layer (1b). The conductive layer (1b) may, for example, be disposed between the adhesive layer (1) and the resin substrate film (1a).

[0172] The conductive layer (1b) can be a single layer or two or more layers.

[0173] The conductive layer (1b) can be formed on any suitable substrate. As such a substrate, a resin substrate film (1a) is preferred.

[0174] For the conductive layer (1b), the conductive layer can be formed on any suitable substrate (preferably a resin substrate film (1a)) using any suitable thin film forming method, such as vacuum evaporation, sputtering, ion plating, jet pyrolysis, electroless plating, electroplating, or a combination thereof. Among these thin film forming methods, vacuum evaporation and sputtering are preferred from the perspectives of conductive layer formation speed, large-area film formation capability, and productivity.

[0175] Examples of materials used to form the conductive layer (1b) include: metallic materials formed from gold, silver, platinum, palladium, copper, aluminum, nickel, chromium, titanium, iron, cobalt, tin, and their alloys; metal oxide materials formed from indium oxide, tin oxide, titanium oxide, cadmium oxide, and mixtures thereof; other metallic compounds formed from copper iodide; and so on.

[0176] The thickness of the conductive layer (1b) can be any suitable thickness depending on the purpose, without impairing the effects of the present invention. For example, in the case of a layer formed from a metallic material, a suitable thickness is preferred. In the case of being formed from metal oxide materials, it is preferred

[0177] The surface resistivity of the conductive layer (1b) is preferably 1.0 × 10⁻⁶. 10 Ω / □ or less, more preferably 1.0×10 9 Ω / □ or less, more preferably 1.0 × 10 8 Ω / □ or less, preferably 1.0 × 10 7 Below Ω / □.

[0178] When the conductive layer is formed on any suitable substrate (preferably a resin substrate film (1a)), any suitable pretreatment such as corona discharge treatment, ultraviolet irradiation treatment, plasma treatment, sputtering etching treatment, or primer treatment can be performed on the surface of the substrate (preferably a resin substrate film (1a)) to improve the adhesion between the conductive layer and the substrate (preferably a resin substrate film (1a)).

[0179] The substrate film (1) may have an antistatic layer (1c). The antistatic layer (1c) may typically be disposed between the adhesive layer (1) and the resin substrate film (1a), and / or between the resin substrate film (1a) and the adhesive layer (2).

[0180] The antistatic layer (1c) can be a single layer or two or more layers.

[0181] The thickness of the antistatic layer (1c) can be any suitable thickness depending on the purpose, without impairing the effect of the present invention. Preferably, the thickness is 1 nm to 1000 nm, more preferably 5 nm to 900 nm, even more preferably 7.5 nm to 800 nm, and particularly preferably 10 nm to 700 nm.

[0182] The surface resistivity of the antistatic layer (1c) is preferably 1.0 × 10⁻⁶. 10 Ω / □ or less, more preferably 8.0×10 9 Ω / □ or less, preferably 5.0 × 10 9 Ω / □ or less, preferably 1.0 × 10 9 Below Ω / □.

[0183] As the antistatic layer (1c), any suitable antistatic layer can be used as long as it can exert an antistatic effect, without impairing the effect of the present invention. As such an antistatic layer (1c), the description of the antistatic layer (IIIc) in item A-1. Release Liner (III) can be used.

[0184] A-4. Adhesive Layer (2)

[0185] The adhesive layer (2) may be any suitable adhesive layer without impairing the effects of the present invention. The adhesive layer (2) may be only one layer or may be two or more layers.

[0186] From the perspective of further demonstrating the effects of the present invention, the thickness of the adhesive layer (2) is preferably 0.5 μm to 150 μm, more preferably 1 μm to 100 μm, further preferably 2 μm to 80 μm, particularly preferably 3 μm to 50 μm, and most preferably 5 μm to 24 μm.

[0187] The adhesive layer (2) can be formed by any suitable method. Examples of such methods include: applying an adhesive composition (preferably an acrylic adhesive composition (2)) that forms the adhesive constituting the adhesive layer (2) onto any suitable substrate (e.g., a substrate film (2)), heating / drying as needed, and curing it as needed, thereby forming the adhesive layer on the substrate. Examples of such coating methods include: gravure roller coating, reverse roller coating, licking coating, dip roller coating, wire bar coating, doctor blade coating, air knife coating, spraying, comma coating, direct coating, and roller brush coating.

[0188] The adhesive layer (2) may also contain other components (2). These other components (2) may be only one type or two or more. Any suitable other component (2) may be used as the other component (2) without impairing the effects of the present invention. Examples of such other components (1) include: other polymer components, crosslinking accelerators, crosslinking catalysts, silane coupling agents, tackifying resins (rosin derivatives, polyterpene resins, petroleum resins, oil-soluble phenols, etc.), anti-aging agents, inorganic fillers, organic fillers, metal powders, colorants (pigments, dyes, etc.), foils, ultraviolet absorbers, antioxidants, light stabilizers, chain transfer agents, plasticizers, softeners, surfactants, conductive components, stabilizers, surface lubricants, leveling agents, corrosion inhibitors, heat stabilizers, polymerization inhibitors, lubricants, solvents, catalysts, etc.

[0189] As other components (2), conductive components can be representatively cited. There may be only one conductive component, or there may be two or more. Any suitable conductive component may be used as a conductive component without impairing the effects of the present invention. Examples of such conductive components include: ionic liquids, ionic conductive polymers, ionic conductive fillers, conductive polymers, etc.

[0190] <A-4-1. Acrylic Adhesives>

[0191] The adhesive layer (2) is preferably formed of an acrylic adhesive (2).

[0192] The acrylic adhesive (2) is formed from the acrylic adhesive composition (2).

[0193] From the viewpoint of being able to further demonstrate the effects of the present invention, the acrylic adhesive composition (2) preferably contains an acrylic polymer (C).

[0194] Acrylic polymers (C) are substances referred to as base polymers in the field of acrylic adhesives. There can be only one acrylic polymer or two or more.

[0195] The acrylic polymer (C) in the acrylic adhesive composition (2) is preferably 60% to 99.9% by weight, more preferably 65% ​​to 99.9% by weight, further preferably 70% to 99.9% by weight, particularly preferably 75% to 99.9% by weight, and most preferably 80% to 99.9% by weight, in terms of solid content.

[0196] As the acrylic polymer (C), any suitable acrylic polymer can be used without impairing the effects of the present invention.

[0197] From the perspective of further demonstrating the effects of the present invention, the weight-average molecular weight of the acrylic polymer (C) is preferably 300,000 to 2,500,000, more preferably 350,000 to 2,000,000, further preferably 400,000 to 1,800,000, and particularly preferably 500,000 to 1,500,000.

[0198] The acrylic adhesive composition (2) may contain a crosslinking agent. By using a crosslinking agent, the cohesive strength of the acrylic adhesive can be improved, further demonstrating the effects of the present invention. The crosslinking agent may be only one type or may be two or more types.

[0199] As a crosslinking agent, the description in <A-2-1. Acrylic Adhesives (1)> can be cited.

[0200] The crosslinking agent content in the acrylic adhesive composition (2) can be any suitable amount within a range that does not impair the effects of the present invention. As such a content, for example, considering from the aspect that can further demonstrate the effects of the present invention, is preferably 0.05 parts by weight to 20 parts by weight, more preferably 0.1 parts by weight to 18 parts by weight, further preferably 0.5 parts by weight to 15 parts by weight, and particularly preferably 0.5 parts by weight to 10 parts by weight relative to the solid content (100 parts by weight) of the acrylic polymer (C).

[0201] The acrylic adhesive composition (2) may contain any other suitable ingredients without impairing the effects of the present invention. Examples of such other ingredients include, for instance, polymer components other than acrylic polymers, crosslinking accelerators, crosslinking catalysts, silane coupling agents, tackifying resins (rosin derivatives, polyterpene resins, petroleum resins, oil-soluble phenols, etc.), anti-aging agents, inorganic fillers, organic fillers, metal powders, colorants (pigments, dyes, etc.), foils, ultraviolet absorbers, antioxidants, light stabilizers, chain transfer agents, plasticizers, softeners, surfactants, antistatic agents, conductive agents, stabilizers, surface lubricants, leveling agents, corrosion inhibitors, heat stabilizers, polymerization inhibitors, lubricants, solvents, catalysts, etc.

[0202] As the acrylic polymer (C), from the viewpoint of further demonstrating the effects of the present invention, it is preferable to form an acrylic polymer (C) by polymerization of a composition (C) comprising an alkyl ester moiety having 4 to 12 carbon atoms in the alkyl group (a component) and at least one of a composition (C) selected from (meth)acrylate having an OH group and (meth)acrylic acid. (a component) and (b component) may each be only one type or may be two or more types.

[0203] Alkyl methacrylates (component a) in which the alkyl group has 4 to 12 carbon atoms are examples of alkyl methacrylates, such as n-butyl methacrylate, isobutyl methacrylate, sec-butyl methacrylate, tert-butyl methacrylate, pentyl methacrylate, hexyl methacrylate, heptyl methacrylate, octyl methacrylate, 2-ethylhexyl methacrylate, isooctyl methacrylate, nonyl methacrylate, isononyl methacrylate, decyl methacrylate, isodecanyl methacrylate, undecyl methacrylate, and dodecyl methacrylate. Among these, n-butyl methacrylate and 2-ethylhexyl methacrylate are preferred, and n-butyl methacrylate and 2-ethylhexyl methacrylate are more preferred, from the perspective of further demonstrating the effects of the present invention.

[0204] As at least one of (meth)acrylates and (meth)acrylic acid having an OH group, examples include hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, hydroxybutyl (meth)acrylate, and other (meth)acrylates and (meth)acrylic acid having an OH group. Among these, hydroxyethyl (meth)acrylate and (meth)acrylic acid are preferred from the viewpoint of further demonstrating the effects of the present invention, and hydroxyethyl acrylate and acrylic acid are more preferred.

[0205] Composition (C) may contain comonomers other than components (a) and (b). The comonomer may be one type or two or more. Examples of such comonomers include: itaconic acid, maleic acid, fumaric acid, crotonic acid, isocrotonic acid, their anhydrides (e.g., maleic anhydride, itaconic anhydride, etc., anhydride-containing monomers), and carboxyl-containing monomers (except for (meth)acrylic acid); (meth)acrylamide, N,N-dimethyl(meth)acrylamide, N-hydroxymethyl(meth)acrylamide, N-methoxymethyl(meth)acrylamide, N-butoxymethyl(meth)acrylamide, N-hydroxyethyl(meth)acrylamide, etc., containing amide groups. Monomers; amino-containing monomers such as aminoethyl methacrylate, dimethylaminoethyl methacrylate, and tert-butylaminoethyl methacrylate; epoxy-containing monomers such as glycidyl methacrylate and methylglycidyl methacrylate; cyano-containing monomers such as acrylonitrile and methacrylonitrile; N-vinyl-2-pyrrolidone, methacryloylmorpholine, N-vinylpiperidinone, N-vinylpiperazine, N-vinylpyrrole, N-vinylimidazolium, vinylpyridine, vinylpyrimidine, and vinyl... Monomers containing heterocyclic vinyl groups, such as azoles; monomers containing sulfonic acid groups, such as sodium vinyl sulfonate; monomers containing phosphate groups, such as 2-hydroxyethyl acryloyl phosphate; monomers containing imide groups, such as cyclohexyl maleimide and isopropyl maleimide; monomers containing isocyanate groups, such as 2-methacryloyloxyethyl isocyanate; (meth)acrylates with alicyclic hydrocarbon groups, such as cyclopentyl methacrylate, cyclohexyl methacrylate, and isobornyl methacrylate; (meth)acrylates with aromatic hydrocarbon groups, such as phenyl methacrylate, phenoxyethyl methacrylate, and benzyl methacrylate; vinyl esters, such as vinyl acetate and vinyl propionate; aromatic vinyl compounds, such as styrene and vinyltoluene; olefins and dienes, such as ethylene, butadiene, isoprene, and isobutylene; vinyl ethers, such as vinyl alkyl ethers; vinyl chloride; etc.

[0206] Multifunctional monomers can also be used as comonomers. A multifunctional monomer is a monomer having two or more olefinic unsaturated groups in one molecule. Any suitable olefinic unsaturated group can be used as the olefinic unsaturated group without impairing the effects of the present invention. Examples of such olefinic unsaturated groups include free radical polymerizable functional groups such as vinyl, propenyl, isopropenyl, vinyl ether (ethoxy), and allyl ether (allyloxy). Examples of multifunctional monomers include: hexanediol di(meth)acrylate, butanediol di(meth)acrylate, polyethylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, pentaerythritol di(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, trimethylolpropane tri(meth)acrylate, tetramethylolmethane tri(meth)acrylate, allyl methacrylate, vinyl methacrylate, divinylbenzene, epoxy acrylate, polyester acrylate, and urethane acrylate. Such multifunctional monomers can be one or more types.

[0207] Alkoxyalkyl esters of (meth)acrylate can also be used as comonomers. Examples of alkoxyalkyl esters of (meth)acrylate include: 2-methoxyethyl ester, 2-ethoxyethyl ester, methoxytriethylene glycol ester, 3-methoxypropyl ester, 3-ethoxypropyl ester, 4-methoxybutyl ester, and 4-ethoxybutyl ester. There may be only one alkoxyalkyl ester or two or more.

[0208] From the viewpoint of further demonstrating the effects of the present invention, the content of alkyl methacrylate (component a) with 4 to 12 carbon atoms in the alkyl group of the alkyl ester moiety is preferably 30% or more, more preferably 50% to 99% by weight, further preferably 70% to 98% by weight, and particularly preferably 90% to 98% by weight, relative to the total amount of monomer components constituting the acrylic polymer (C).

[0209] From the viewpoint of further demonstrating the effects of the present invention, the content of at least one (b component) selected from (meth)acrylates having OH groups and (meth)acrylic acid is preferably 1% or more, more preferably 1% to 30% by weight, further preferably 2% to 20% by weight, particularly preferably 3% to 10% by weight, and most preferably 3% to 6% by weight, relative to the total amount (100% by weight) of monomer components constituting the acrylic polymer (C).

[0210] Composition (C) may contain any suitable other components without impairing the effects of the present invention. Examples of such other components include, for instance, polymerization initiators, chain transfer agents, solvents, etc. The amounts of these other components may be any suitable amounts without impairing the effects of the present invention.

[0211] Polymerization initiators can be selected based on the type of polymerization reaction, such as thermal polymerization initiators or photopolymerization initiators (photoinitiators). There can be only one type of polymerization initiator, or two or more.

[0212] As a thermal polymerization initiator and a photopolymerization initiator (photoinitiator), the description in [A-2-1-1. Preferred embodiment 1 of (meth)acrylic resin (1)] can be cited.

[0213] <A-4-2. Conductive Components>

[0214] The adhesive layer (2) may contain a conductive component. The conductive component may be only one type or two or more types. Any suitable conductive component may be used without impairing the effects of the present invention. Examples of such conductive components include: ionic liquids, ionic conductive polymers, ionic conductive fillers, and conductive polymers.

[0215] 《A-5. Substrate Film (2)》

[0216] From the perspective of further demonstrating the effects of the present invention, the thickness of the substrate film (2) is preferably 10 μm to 300 μm, more preferably 20 μm to 200 μm, further preferably 30 μm to 150 μm, particularly preferably 35 μm to 100 μm, and most preferably 35 μm to 80 μm.

[0217] The substrate film (2) includes a resin substrate film (2a).

[0218] As for the resin substrate film (2a), the description of the resin substrate film (IIIa) in section A-1. Release Liner (III) can be used.

[0219] The substrate film (2) may have a conductive layer (2b). The conductive layer (2b) may be disposed between the adhesive layer (2) and the resin substrate film (2a).

[0220] The conductive layer (2b) can be a single layer or two or more layers.

[0221] As the conductive layer (2b), the description of the conductive layer (1b) in section A-3. Substrate film (1) can be used.

[0222] The substrate film (2) may have an antistatic layer (2c). The antistatic layer (2c) may be disposed between the adhesive layer (2) and the resin substrate film (2a), and / or on the opposite side of the adhesive layer (2) of the resin substrate film (2a).

[0223] The antistatic layer (2c) can be a single layer or two or more layers.

[0224] The thickness of the antistatic layer (2c) can be any suitable thickness depending on the purpose, without impairing the effect of the present invention. Preferably, the thickness is 1 nm to 1000 nm, more preferably 5 nm to 900 nm, even more preferably 7.5 nm to 800 nm, and particularly preferably 10 nm to 700 nm.

[0225] As an antistatic layer (2c), the description of the antistatic layer (1c) in item A-3. Substrate film (1) can be used.

[0226] The antistatic layer (2c) may also contain any other suitable components without impairing the effects of the present invention.

[0227] "B. Manufacturing Method of Adhesive Tape for Optical Components"

[0228] Without compromising the effectiveness of the invention, the adhesive tape for optical components of the embodiments of the invention can be manufactured by any suitable method.

[0229] As a representative example of the manufacturing method of the adhesive tape for optical components according to an embodiment of the present invention, the following situation will be described: The adhesive tape for optical components according to an embodiment of the present invention is a laminate having, in sequence, a release liner (III), an adhesive layer (1), a substrate film (1), an adhesive layer (2), a substrate film (2), and a minimum number of layers of 3 or more, and a maximum number of layers of 5 or more. The adhesive layer (1) and the substrate film (1) are constituent elements of the adhesive tape (I) for protecting optical components, and the adhesive layer (2) and the substrate film (2) are constituent elements of the retaining tape (II). The outermost side of the adhesive layer (1) of the adhesive tape (I) for protecting optical components is directly laminated with the adhesive layer (2). The release liner (III) is directly laminated on the exposed surface of the adhesive layer (1). Two or more adhesive tapes (I) for protecting optical components are laminated on one retaining tape (II) in a spaced arrangement.

[0230] In one embodiment of the method for manufacturing an adhesive tape for optical components according to an embodiment of the present invention, a laminate (X) having a release liner (III), an adhesive layer (1), and a substrate film (1) and being composed of these constituent elements (i.e., a laminate of the release liner (III) and the adhesive tape (I) for protecting optical components) in sequence, and a retaining tape (II) having an adhesive layer (2) and a substrate film (2) in sequence and being composed of these constituent elements are manufactured respectively. Then, on one retaining tape (II), the surface of the substrate film (1) of the laminate (X) is bonded to the surface of the adhesive layer (2) of the retaining tape (II), and two or more adhesive tapes (I) for protecting optical components are arranged with gaps.

[0231] The laminate (X) can be manufactured, for example, by applying an adhesive composition (selected from at least one of acrylic adhesive composition (1), urethane adhesive composition (1), rubber adhesive composition (1), and silicone adhesive composition (1)) that forms the adhesive layer (1) onto a substrate film (1), heating / drying as needed, and curing it as needed to form the adhesive layer (1) on the substrate film (1), and then attaching a release liner (III) (the release layer (IIIb) side when there is a release layer (IIIb)) to the side of the adhesive layer (1) opposite to the substrate film (1).

[0232] For the retaining tape (II), for example, an adhesive composition (preferably at least one selected from acrylic adhesives (2) and urethane adhesives (2) that forms the adhesive layer (2) is applied to the substrate film (2), heated / dried as needed, and cured as needed to form the adhesive layer (2) on the substrate film (2). It should be noted that in order to protect the exposed surface of the adhesive layer (2) until the laminate (X) is bonded to the retaining tape (II), any suitable diaphragm (e.g., the same film as the release liner (III)) can be bonded.

[0233] In the adhesive tape for optical components according to embodiments of the present invention, at least one of the corners formed on the opposing sides of two adjacent adhesive tapes (I) for protecting optical components with a gap is a chamfered portion, and the chamfered portion is preferably selected from at least one of the C-surface and the R-surface. As a method for forming the chamfered portion, any suitable forming method can be adopted within the scope of not impairing the effect of the present invention. For example, as methods for forming the chamfered portion of the C-surface and the chamfered portion of the R-surface, examples include cutting processing using a tool using a press, laser cutting processing, and cutting processing using an end mill.

[0234] 《C. Method of Using Adhesive Tape for Optical Components》

[0235] Without impairing the effects of the present invention, the adhesive tape for optical components according to embodiments of the present invention can be used in any suitable method. Representative examples of such use include the following methods.

[0236] (1) First, the release liner (III) is peeled off from the adhesive tape for optical components according to the embodiment of the present invention. At this time, in the adhesive tape for optical components according to the embodiment of the present invention, by making at least one of the corners formed on the opposite sides of the two adjacent adhesive tapes (I) for protecting optical components with gaps chamfered, it is possible to reliably peel off the two or more adhesive tapes (I) for protecting optical components that are stacked on a retaining tape (II) with gaps while peeling off the release liner (III) at the interface between the release liner (III) and the adhesive tape (I) for protecting optical components, while keeping them well on the retaining tape (II). This is because, by making at least one of the corners formed on the opposite sides of the two adjacent optical component protective adhesive strips (I) in the gap chamfer, when the release liner (III) is peeled off, the force that wants to separate the release liner (III) from the optical component protective adhesive strip (I) and the force that wants to separate the optical component protective adhesive strip (I) from the retaining strip (II) can act in a proper balance, thus suppressing the occurrence of previous peeling abnormalities.

[0237] (2) Next, while holding two or more optical component protective adhesive tapes in place of one retaining tape, attach them to the exposed adhesive layer (1) while aligning them with the substrate. Thus, a laminate in which optical component protective adhesive tape (I) and retaining tape (II) are sequentially stacked on the substrate can be obtained.

[0238] (3) Finally, from the laminate peeling and retaining tape (II) obtained in (2) above, a state can be obtained in which an adhesive tape (I) for protecting optical components is attached to the adhered object.

[0239] Example

[0240] The present invention will now be specifically described with reference to embodiments, but the present invention is not limited to these embodiments in any way. It should be noted that the testing and evaluation methods in the embodiments, etc., are as follows. It should be noted that when "parts" are used, unless otherwise specified, they refer to "parts by weight"; when "%" are used, unless otherwise specified, they refer to "% by weight".

[0241] <Evaluation of Demolding Liner Peeling>

[0242] The evaluation of the release liner peeling is described below using the optical component adhesive tape (1) obtained in Example 1 (which includes an optical component protective adhesive tape (1A) with a release liner, an optical component protective adhesive tape (1B) with a release liner, and a retaining tape). The same evaluation is performed for other examples and comparative examples.

[0243] An adhesive tape (1) for optical components is arranged such that it adheres to the adsorption stage on one side. A clamping device holds one corner of the release liner on the corners 2a and 2b of the adhesive tape (1B) for protecting optical components with a release liner. A peeling roller is mounted on the clamping device and fixed to the surface of the release liner. Then, the clamping device is moved along the in-plane direction of the adsorption stage at a speed of 10 mm / min in the diagonal direction of the held corner. At this time, the clamping device moves upward while moving at an angle of 45 degrees relative to the plane of the adsorption stage and an angle of 30 degrees relative to the vertical direction of the adsorption stage. That is, the angle between the adhesive tape (1) for optical components and the peeling direction is 45 degrees when viewed from above, and the angle between the plane direction and the peeling direction is 30 degrees when viewed from the side. In this way, the release liner is peeled off from the adhesive tape (1A) and (1B) for protecting optical components. If the adhesive tapes (1A) and (1B) protecting the optical components can be peeled off without following the release liner during peeling, the evaluation result is set as peeling qualified. This test was conducted on 10 samples, and the judgment was made as described below.

[0244] A: More than 9 out of 10 pieces are properly peeled.

[0245] B: More than 5 out of 10 pieces are properly peeled.

[0246] C: Less than 5 out of 10 pieces are properly peeled.

[0247] <Determination of Peel Strength A>

[0248] The samples were cut into pieces 25 mm wide and 150 mm long for evaluation. The peel force A was measured using a universal tensile testing machine (MINEBEA Co., Ltd., product name: TCM-1kNB) at a peel angle of 180 degrees and a tensile speed of 300 mm / min in an atmosphere of 23°C and 50% RH.

[0249] <Determination of Adhesive Strength B>

[0250] The samples were cut into pieces 25 mm wide and 150 mm long as evaluation samples. In an atmosphere of 23°C and 50% RH, the adhesive layer surface of the evaluation samples was adhered to the surface of the substrate layer described in each example and comparative example by reciprocating a 2.0 kg roller once. After curing for 30 minutes in an atmosphere of 23°C and 50% RH, the adhesive force B was measured using a universal tensile testing machine (manufactured by MINEBEA Co., Ltd., product name: TCM-1kNB) at a peel angle of 180 degrees and a tensile speed of 300 mm / min.

[0251] <Determination of Storage Modulus G'>

[0252] Storage modulus G' is equivalent to the portion of elastic energy stored when a material deforms, and it is an indicator of the degree of hardness.

[0253] Only the adhesive layer was taken from the adhesive tape for protecting optical components formed on the release liner as described in the various embodiments and comparative examples, and the layers were stacked to form a thickness of about 1 mm. The tape was then punched into φ9 mm to produce cylindrical granules for use as test samples.

[0254] Using a dynamic viscoelasticity measuring apparatus (Rheometrics, ARES), the obtained sample was fixed in a fixture with a parallel plate of φ8mm, and the storage modulus G' was calculated. The measurement conditions were set as follows.

[0255] Measurement: Shear Mode

[0256] Temperature range: -60℃~210℃

[0257] Heating rate: 5℃ / min

[0258] Frequency: 1Hz

[0259] [Manufacturing Example 1]

[0260] (Preparation of oligomer A)

[0261] Dicyclopentyl methacrylate (DCPMA) 60 parts by weight and methyl methacrylate (MMA) 40 parts by weight, α-thioglycerol 3.5 parts by weight as a chain transfer agent, and toluene 100 parts by weight as a polymerization solvent were mixed and stirred at 70°C for 1 hour under a nitrogen atmosphere. Next, 2,2'-azobisisobutyronitrile (AIBN) 0.2 parts by weight was added as a thermal polymerization initiator, and the mixture was reacted at 70°C for 2 hours, then the temperature was increased to 80°C and reacted for another 2 hours. The reaction mixture was then heated to 130°C, and the toluene, chain transfer agent, and unreacted monomers were dried to remove them, yielding a solid acrylic oligomer (oligomer A). Oligomer A has a weight-average molecular weight of 5100 and a glass transition temperature (Tg) of 130°C.

[0262] [Manufacturing Example 2]

[0263] (Preparation of adhesive composition (a) for adhesive tape for protecting optical components)

[0264] A prepolymer composition (polymerization rate: approximately 10%) was obtained by polymerization of 40 parts by weight of lauryl acrylate (LA), 50 parts by weight of 2-ethylhexyl acrylate (2EHA), 4 parts by weight of 4-hydroxybutyl acrylate (4HBA), and 6 parts by weight of N-vinyl-2-pyrrolidone (NVP) as monomer components for prepolymer formation, and 0.015 parts by weight of BASF's "IRGACURE 184" as a photopolymerization initiator, under ultraviolet light irradiation.

[0265] After adding 0.07 parts by weight of 1,6-hexanediol diacrylate (HDDA), 3 parts by weight of oligomer A prepared in Manufacturing Example 1, and 0.3 parts by weight of silane coupling agent (Shin-Etsu Chemical "KBM403") as a post-added component to 100 parts by weight of the above prepolymer composition, they were uniformly mixed to obtain an adhesive composition (a) for adhesive tape for protecting optical components.

[0266] [Manufacturing Example 3]

[0267] (Preparation of adhesive composition (b) for adhesive tape for protecting optical components)

[0268] 63 parts by weight of 2-ethylhexyl acrylate (2EHA), 15 parts by weight of N-vinyl-2-pyrrolidone (NVP), 9 parts by weight of methyl methacrylate (MMA), 13 parts by weight of 2-hydroxyethyl acrylate (HEA), 0.2 parts by weight of 2,2'-azobisisobutyronitrile (2,2'-azobisisobutyronitrile) as a polymerization initiator, and 133 parts by weight of ethyl acetate as a polymerization solvent were added to a separable flask. Nitrogen gas was introduced while stirring for 1 hour. After removing oxygen from the polymerization system, the temperature was raised to 65°C and the reaction was carried out for 10 hours. Then, ethyl acetate was added to obtain a solution of acrylic polymer with a solid content of 30% by weight.

[0269] An isocyanate crosslinking agent (trade name "Takenate D110N", manufactured by Mitsui Chemicals Co., Ltd.) was added to the solution of the obtained acrylic polymer, so that it reached 1 part by weight relative to 100 parts by weight of the solid content of the acrylic polymer, thus obtaining an adhesive composition (b) for adhesive tape for optical component protection.

[0270] [Manufacturing Example 4]

[0271] (Making of the tape using acrylic polymer)

[0272] In a four-necked flask equipped with a stirring blade, thermometer, nitrogen inlet tube, and condenser, 100 parts by weight of 2-ethylhexyl acrylate (manufactured by Nippon Shokubai Co., Ltd.), 4 parts by weight of 2-hydroxyethyl acrylate (manufactured by Toa Synthetic Co., Ltd.), 0.2 parts by weight of 2,2'-azobisisobutyronitrile (manufactured by Wako Pure Chemical Industries, Ltd.) as a polymerization initiator, and 156 parts by weight of ethyl acetate were added. Nitrogen gas was introduced while stirring slowly, and the liquid temperature in the flask was maintained at around 65°C for 6 hours to prepare a solution (40% by weight) of an acrylic polymer with a weight average molecular weight of 550,000, thus obtaining an acrylic polymer for use in retaining a belt.

[0273] [Manufacturing Example 5]

[0274] (Making the retainer strap)

[0275] In the acrylic polymer solution for the retaining tape manufactured in Manufacturing Example 4, 5 parts by weight of CORONATE HX (manufactured by Nippon Polyurethane Kogyo Co., Ltd.) as a crosslinking agent, 0.3 parts by weight of Aqualon HS-10 (manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.) as a crosslinking agent, and 0.03 parts by weight of Embilizer OL-1 (manufactured by Tokyo Fine Chemical Co., Ltd.) as a crosslinking catalyst were added per 100 parts by weight of the solution. The solution was diluted with ethyl acetate to achieve a total solid content of 25% by weight. The solution was stirred using a disperser and coated onto a polyester resin substrate “Lumirror S10” (38 μm thick, manufactured by Toray Industries, Inc.) using an impregnation roller. The resulting thickness after drying was 10 μm. The substrate was then cured and dried at a drying temperature of 130°C for 30 seconds. Thus, an adhesive layer was formed on the substrate. Next, a silicone-treated surface of a 25μm thick substrate made of polyester resin was applied to the adhesive layer to obtain the retaining strip.

[0276] [Example 1]

[0277] A 75 μm thick polyethylene terephthalate (PET) film (Mitsubishi Chemical's "DIAFOIL MRF75") with a silicone release layer on its surface was used as a substrate (also serving as a heavy-duty release film). An adhesive composition (a) for the optical component protective adhesive tape obtained in Manufacturing Example 2 was coated onto this substrate to a thickness of 25 μm, forming a coating layer. A 75 μm thick PET film (Mitsubishi Chemical's "DIAFOIL MRE75") with a silicone release treatment on one side was then bonded onto this coating layer as a cover sheet (also serving as a light-duty release film). For this laminate, the irradiation intensity of the irradiation surface directly below the lamp was achieved to 5 mW / cm². 2 A black light lamp with adjusted position was used to irradiate ultraviolet light from the cover side for photocuring, resulting in an adhesive sheet with a thickness of 25 μm. Then, a light release film was peeled off from the adhesive sheet, and an adhesive layer formed on the release liner was bonded to one side of a 25 μm thick polyimide substrate (trade name "UPILEX 25RN", Ube Industries, Ltd.) prepared as a substrate layer. The resulting structure was passed once through a laminator at 80°C (0.3 MPa, speed 0.5 m / min), and then aged in an oven at 50°C for one day. The heavy release film was then peeled off, and a new release liner (DIAFOIL MRF-50", Mitsubishi Resin Corporation) was applied. Thus, an adhesive tape for protecting optical components with a release liner was obtained (1).

[0278] The obtained adhesive tape (1) for protecting optical components with a release liner was processed by pressure cutting to obtain an adhesive tape (1A) for protecting optical components with a release liner that is 10 cm in length, 5 cm in width, with 0.5 mm C at 1a and 1b of the four corners, and has been chamfered. Figure 3 The adhesive tape for protecting optical components (I) 101, and the adhesive tape for protecting optical components (1B) with a release liner, which is 2cm in length, 5cm in width, and has C 0.5mm at 2a and 2b of the four corners, and has been chamfered (equivalent to) Figure 3 Adhesive tape (I) 102 for protecting optical components in the middle.

[0279] Next, as Figure 3 As shown, on the adhesive layer of the retaining tape, the substrate film side of the adhesive tape for protecting optical components with release liner (1A) and the substrate film side of the adhesive tape for protecting optical components with release liner (1B) are arranged and bonded in such a way that the chamfered portions 1a and 1b of the adhesive tape for protecting optical components with release liner (1A) become the side of the adhesive tape for protecting optical components with release liner (1B), and the chamfered portions 2a and 2b of the adhesive tape for protecting optical components with release liner (1B) become the opposite side of the adhesive tape for protecting optical components with release liner (1A), thus obtaining the adhesive tape (1) for optical components.

[0280] The results are shown in Table 1.

[0281] [Example 2]

[0282] The thickness of the adhesive layer was set to 15 μm, and an adhesive tape (2) for protecting optical components with a release liner was obtained. Otherwise, the same procedure as in Example 1 was performed to obtain an adhesive tape (2) for optical components.

[0283] The results are shown in Table 1.

[0284] [Example 3]

[0285] The chamfering was set to C 0.2 mm, and otherwise performed in the same manner as in Example 2, resulting in an adhesive tape (3) for optical components.

[0286] The results are shown in Table 1.

[0287] [Example 4]

[0288] The chamfering was set to C 0.1 mm, and otherwise carried out in the same manner as in Example 2, resulting in an adhesive tape (4) for optical components.

[0289] The results are shown in Table 1.

[0290] [Example 5]

[0291] A commercially available release liner (“DIAFOIL MRF-38”, Mitsubishi Resin Corporation) was prepared. The adhesive composition (b) for the optical component protection tape obtained in Manufacturing Example 3 was applied to one side of the release liner (the release surface) to achieve a dried thickness of 25 μm, and then dried at 130°C for 3 minutes. Thus, an adhesive layer with a thickness of 25 μm, formed by the adhesive corresponding to the adhesive composition (b) for the optical component protection tape, was formed on the release surface of the release liner, and aged at room temperature for 5 days.

[0292] As the substrate layer, a 25 μm thick polyimide substrate (trade name "UPILEX25RN", Ube Industries, Ltd.) was prepared. An adhesive layer formed on the release liner was bonded to one side of this substrate layer. The resulting structure was passed through a laminator at 80°C (0.3 MPa, speed 0.5 m / min) once, aged in an oven at 50°C for 1 day, the release liner was peeled off, and a new release liner ("DIAFOIL MRF-50", Mitsubishi Resin Corporation) was re-bonded. Thus, an adhesive tape (5) for protecting optical components with a release liner was obtained. As an adhesive tape for protecting optical components with a release liner, the adhesive tape (5) for protecting optical components with a release liner was used. Otherwise, the procedure was the same as in Example 2, and an adhesive tape (5) for optical components was obtained.

[0293] The results are shown in Table 1.

[0294] [Example 6]

[0295] The chamfering process was set to R 0.5mm, and otherwise carried out in the same manner as in Example 2, resulting in an adhesive tape (6) for optical components.

[0296] The results are shown in Table 1.

[0297] [Example 7]

[0298] The chamfering process was set to R 0.1mm, and otherwise carried out in the same manner as in Example 2, resulting in an adhesive tape (7) for optical components.

[0299] The results are shown in Table 1.

[0300] [Comparative Example 1]

[0301] Without chamfering, the same procedure as in Example 2 was performed to obtain an adhesive tape (C1) for optical components.

[0302] The results are shown in Table 1.

[0303] [Comparative Example 2]

[0304] A 50 μm thick polyimide substrate (trade name "UPILEX 50RN" Ube Industries, Ltd.) was used instead of a 25 μm thick polyimide film. No chamfering was performed. Otherwise, the process was the same as in Example 2, and an adhesive tape for optical components (C2) was obtained.

[0305] The results are shown in Table 1.

[0306]

[0307] Industrial applicability

[0308] The adhesive tape for optical components according to embodiments of the present invention can be used as an adhesive tape for, for example, pasting foldable components and rollable components. Examples of foldable components and rollable components include OLEDs.

Claims

1. An adhesive tape for optical components, comprising: An adhesive tape (I) for protecting optical components, having an adhesive layer on one side of the substrate film. The outermost retaining strip (II) directly laminated on the opposite side of the adhesive layer of the adhesive tape (I) for protecting the optical component, and A release liner (III) is directly laminated onto the exposed surface of the adhesive layer of the adhesive tape (I) for protecting the optical component. On one retaining tape (II), two or more adhesive tapes (I) for protecting the optical component are stacked in a spaced arrangement. The thickness of the adhesive layer is less than 25 μm. At least one of the corners formed on the opposite sides of the two adjacent adhesive tapes (I) for protecting the optical components, as observed from the adhesive layer side of the adhesive tape (I) for protecting the optical components, is a chamfer.

2. The adhesive tape for optical components according to claim 1, wherein, The chamfered portion is surface C, and the chamfering amount of the chamfered portion is C 0.05mm or more.

3. The adhesive tape for optical components according to claim 1, wherein, The chamfered portion is an R-shaped surface, and the chamfering amount of the chamfered portion is R 0.05mm or more.

4. The adhesive tape for optical components according to any one of claims 1 to 3, wherein, In an environment with a temperature of 23°C and a humidity of 50%RH, the peeling force A when peeling the release liner (III) is less than the adhesive force B when peeling the retaining strip (II).

5. The adhesive tape for optical components according to any one of claims 1 to 3, wherein, The storage modulus G' of the adhesive constituting the adhesive layer at 23°C is 5.0 × 10⁻⁶. 5 Below Pa.

6. The adhesive tape for optical components according to any one of claims 1 to 3, wherein, Two or more adhesive tapes (I) for protecting the optical component are stacked in an arrangement having the aforementioned gap along the length direction of the aforementioned retaining tape (II). Among the two or more adhesive tapes (I) for protecting optical components, at least one of the corners formed on the sides at both ends in the length direction and observed from the adhesive layer side of the adhesive tape (I) for protecting optical components is an additional chamfer.

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