Multilayer body for hot bending and polarizer with protective film

Abstract

The present invention provides a multilayer body for hot bending, the multilayer body having a thermoplastic resin-containing layer and a protective film provided on the surface of the thermoplastic resin-containing layer, the protective film having a layer containing a polyolefin having a melting point of 150 DEG C or higher and an acrylic pressure-sensitive adhesive layer, the acrylic pressure-sensitive adhesive layer being in contact with the thermoplastic resin-containing layer, and the acrylic pressure-sensitive adhesive layer being in contact with the thermoplastic resin-containing layer. The multilayer body for hot bending has an average peel strength of 1.50 N / 10 mm or less when the protective film is peeled off at a moving speed of 90 DEG C of 300 mm / min after being heated at a temperature of 140 DEG C for 15 minutes. The invention also provides a polaroid with the protective film.

Description

Technical Field

[0001] The invention relates to a multilayer body for heat bending processing and a polarizer with a protective film. Background Art

[0002] Currently, the polarizers typically used are made of a polyvinyl alcohol (PVA) film adsorbed or impregnated with iodine or a dichroic organic dye. This type of polarizer is typically protected on one or both sides with a transparent resin such as triacetylcellulose. This makes it easy to handle and suitable for secondary processing, resulting in low-cost, lightweight polarizing plates.

[0003] Among them, in applications requiring impact resistance, such as polarized lenses for sunglasses, a thermoplastic resin film such as an aromatic polycarbonate film is usually used as a polarizing film substrate, and a polarizing film layer using a dichroic organic dye or a functional layer such as a photochromic layer is formed into a polarizer. The polarizer is then punched into the desired shape, hot-bent into a partial spherical surface, and appropriately surface-treated.

[0004] The above-mentioned production process and subsequent processes are usually carried out separately by manufacturers, distributors, etc. During this period, storage, preservation, transfer, transportation, and distribution are carried out. In addition, even if production is carried out at the same location, temporary storage or preservation may be carried out according to production plans and other circumstances.

[0005] Therefore, the polarizer is attached with a protective film to protect its surface from scratches, dirt, and foreign matter during distribution and processing. This protective film needs to be able to prevent it from peeling off during processing, but also be easy to peel off cleanly after processing without affecting the polarizer.

[0006] As such protective films, research has been conducted on protective films that can withstand heat bending, particularly in high-temperature environments near the glass transition temperature of polycarbonate. For example, Patent Document 1 discloses a protective film that is attached to a polycarbonate sheet or a laminate having a polycarbonate sheet as an outer layer during heat bending. The heat bending process is performed by applying pressure and / or decompression while the sheet is attached to a mold that has been pre-formed into a desired shape. The protective film comprises at least a first film layer disposed on the side in contact with the mold and a second film layer disposed on the side in contact with the polycarbonate sheet. The first film layer is a polyolefin film layer having an actual melting point of 150°C or higher, and the second film layer is a polyolefin film layer having an actual melting point of 125-145°C.

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent Document 1: Japanese Patent Application Laid-Open No. 2003-145616 Summary of the Invention

[0010] Technical problem to be solved by the invention

[0011] Patent Document 1 was a very advanced technology at the time. However, with recent technological innovations, there is a need for technologies with even higher performance. In particular, the technology in Patent Document 1 suffers from problems such as residue on the sides of the multilayer sheet and whitening (cloudiness) of the polarizer.

[0012] In view of the above situation, the object of the present invention is to provide a multilayer body for hot bending suitable for the manufacture of sheets that need to be bent, such as polarizers, and a polarizer with a protective film using the multilayer body for hot bending.

[0013] Technical solutions to technical problems

[0014] Based on the above technical problems, the inventors of the present invention found that the above technical problems can be solved by using a film having a layer containing a polyolefin with a melting point of more than 150°C and an acrylic adhesive layer as a protective film for the polarizer and adjusting its peel strength after hot bending.

[0015] Specifically, the above technical problems are solved by the following solutions.

[0016] <1> A multilayer body for hot bending, comprising a layer containing a thermoplastic resin and a protective film provided on a surface of the layer containing the thermoplastic resin, wherein the protective film comprises a layer containing a polyolefin having a melting point of 150° C. or higher and an acrylic adhesive layer, wherein the acrylic adhesive layer is in contact with the layer containing the thermoplastic resin. After heating the multilayer body for hot bending at 140° C. for 15 minutes, the average peel strength of the protective film when peeled off at a 90° angle at a moving speed of 300 mm / min is 1.50 N / 10 mm or less.

[0017] <2> according to <1> In the multilayer body for hot bending, the polyolefin comprises polypropylene.

[0018] <3> according to <1> or <2> In the multilayer body for hot bending, the thermoplastic resin comprises at least one of polycarbonate, polyamide and polyester.

[0019] <4> according to <1> ~ <3> The multilayer body for heat bending described in any one of the preceding claims is used for heat bending such that the protective film side forms a recessed portion when the multilayer body for heat bending is heat bent.

[0020] <5> according to <1> ~ <4> The multilayer body for heat bending described in any one of the preceding claims, wherein the multilayer body for heat bending is used for the manufacture of polarizers.

[0021] <6> A multilayer body for hot bending processing, which has a layer containing a thermoplastic resin and a protective film arranged on the surface of the layer containing the thermoplastic resin, the protective film has a layer containing a polyolefin with a melting point of more than 150°C and an acrylic adhesive layer, the acrylic adhesive layer is in contact with the layer containing the thermoplastic resin, and after the multilayer body for hot bending processing is heated at a temperature of 140°C for 15 minutes, the average peel strength when the protective film is peeled off at 90° at a moving speed of 300 mm / min is less than 1.50 N / 10 mm. The multilayer body for hot bending processing is used for the manufacture of polarizers. When the polarizer is hot bent using a mold, the protective film is arranged on the side of the mold farther away from the polarizing film.

[0022] <7> according to <6> The multilayer body for hot bending processing, wherein the polyolefin includes polypropylene, the thermoplastic resin includes at least one of polycarbonate, polyamide and polyester, and the multilayer body for hot bending processing is used for polarizer.

[0023] <8> A polarizer with a protective film, wherein the polarizer with a protective film comprises <1> ~ <7> The multilayer body for hot bending described in any one of the above.

[0024] Effects of the Invention

[0025] According to the present invention, a multilayer body for heat bending suitable for production of sheet materials requiring bending, such as polarizers, and a polarizer with a protective film using the multilayer body for heat bending can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of an example of a multilayer body for hot bending according to an embodiment of the present invention.

[0027] Figure 2 Schematic diagram showing an example of a process for producing a polarizer using the multilayer body for heat bending according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] Hereinafter, a specific embodiment for implementing the present invention (hereinafter referred to as "this embodiment") will be described in detail. It should be noted that the following this embodiment is merely an example for explaining the present invention, and the present invention is not limited to this embodiment.

[0029] In addition, in this specification, "to" is used to mean that the numerical values ​​described before and after it are included as the lower limit and the upper limit.

[0030] In this specification, all physical property values ​​and characteristic values ​​refer to values ​​at 23°C unless otherwise specified.

[0031] In this specification, "(meth)acrylate" means both or either acrylate and methacrylate.

[0032] In this specification, unless otherwise specified, the weight average molecular weight and number average molecular weight are all polystyrene-equivalent values ​​measured by GPC (gel permeation chromatography) using HLC-8320GPC EcoSEC manufactured by Tosoh Corporation, using tetrahydrofuran as a solvent and Shodex KF-G, KF-805L, or KF-800D as chromatographic columns at a column temperature of 40°C and a flow rate of 1.2 mL / min, and detected with an RI detector at a detection wavelength of 254 nm.

[0033] In this specification, the term "process" includes not only an independent process but also a process that cannot be clearly distinguished from other processes as long as the intended effect of the process is achieved.

[0034] Multilayer products, as used herein, include those formed into films or sheets. "Film" and "sheet" refer to shaped articles that are thin relative to their length and width, respectively, and are generally flat. However, this is not the case after hot bending. Furthermore, "film" and "sheet" as used herein may be single-layer or multi-layer.

[0035] When measurement methods and other methods described in this manual vary by year, the standards as of January 1, 2023 are used unless otherwise specified.

[0036] Figure 1 and Figure 2 This is a schematic diagram, and the scale may not be consistent with the actual situation.

[0037] The multilayer body for heat bending of this embodiment is characterized by comprising a layer containing a thermoplastic resin and a protective film disposed on the surface of the layer containing the thermoplastic resin. The protective film comprises a layer containing a polyolefin having a melting point of 150°C or higher and an acrylic adhesive layer, the acrylic adhesive layer being in contact with the layer containing the thermoplastic resin. After heating the multilayer body at 140°C for 15 minutes and then peeling the protective film at a 90° angle at a moving speed of 300 mm / min, the average peel strength is 1.50 N / 10 mm or less. This configuration provides a multilayer body for heat bending suitable for the manufacture of sheets requiring bending, such as polarizers with protective films.

[0038] More specifically, a polarizer with a protective film comprising a multilayer body for hot bending and a polarizing film according to this embodiment has moderate adhesion between the portion where the protective film is formed and the portion where the polarizer is formed, both before and after the hot bending process. In particular, even after the hot bending process, the protective film does not peel off, no small wrinkles are observed on the protective film, and no suction cup marks appear on the protective film, making it easy to peel off. Furthermore, when the protective film is peeled off after the hot bending process of the multilayer body for hot bending and the polarizing film are laminated, the polarizer does not appear white. Furthermore, no residue is observed on the sides of the multilayer film after the hot bending process.

[0039] <Layer composition>

[0040] Figure 1 This is a schematic diagram showing an example of a multilayer body for hot bending processing according to the present embodiment, wherein 1 is a multilayer body for hot bending processing, 2 is a layer containing a thermoplastic resin (hereinafter sometimes referred to as a "thermoplastic resin layer"), 3 is an acrylic adhesive layer, 4 is a layer containing a polyolefin having a melting point of 150°C or above (hereinafter sometimes referred to as a "polyolefin layer"), and 5 is a protective film. Among them, the protective film 5 comprises an acrylic adhesive layer 3 and a polyolefin layer 4, and is used to be peeled off from the thermoplastic resin layer 2 at a desired time after the hot bending process. That is, the acrylic adhesive layer 3 and the thermoplastic resin layer 2 need to have adhesion before and after the hot bending process, and have a peelability that allows for clean peeling when necessary. In addition, the protective film 5 protects the molded body while being bonded to the molded body. The molded body includes a thermoplastic resin layer, and as an example, a polarizer can be cited. In addition, the multilayer body for hot bending processing according to the present embodiment is preferably used for the purpose of performing hot bending processing in a manner such that one side of the protective film becomes a concave portion when the multilayer body for hot bending processing is subjected to hot bending processing. The details of the polarizer and heat bending process are described later.

[0041] The thermoplastic resin layer 2 , the acrylic adhesive layer 3 , and the polyolefin layer 4 may each consist of only one layer or two or more layers, but usually consist of one layer (single layer).

[0042] Furthermore, a protective film 5 is provided on the surface of the thermoplastic resin layer 2, and the acrylic adhesive layer 3 of the protective film 5 is in contact with the thermoplastic resin layer 2. The acrylic adhesive layer 3 and the polyolefin layer 4 are generally in contact, but other layers (intermediate layers) may be included without departing from the effects of the present invention. Furthermore, other layers may be included on the back layer (polyolefin layer 4) on the side opposite to the thermoplastic resin layer 2 of the protective film 5 without departing from the effects of the present invention.

[0043] In this embodiment, after heating the multilayer body for heat bending at 140°C for 15 minutes, the average peel strength when peeling the protective film at a 90° angle at a moving speed of 300 mm / min was 1.50 N / 10 mm or less. This configuration allows the protective film 5 to be readily peeled from the molded body at the desired time after heat bending. This adhesiveness can be adjusted by adjusting the type and composition of the acrylic adhesive contained in the acrylic adhesive layer 3. Details of the acrylic adhesive layer will be described later.

[0044] In particular, in the present embodiment, the average peel strength is a value measured according to the description of the Examples described later.

[0045] After heating the multilayer body for hot bending at 140°C for 15 minutes, the average peel strength when peeling off the protective film at a moving speed of 300 mm / min at 90° is preferably 1.20 N / 10 mm or less, more preferably 1.00 N / 10 mm or less, further preferably 0.60 N / 10 mm or less, further preferably 0.50 N / 10 mm or less, and further preferably 0.40 N / 10 mm or less. By setting it below the above upper limit, the protective film tends to be easily peeled off after hot bending. After heating the multilayer body for hot bending at 140°C for 15 minutes, the average peel strength when peeling off the protective film at a moving speed of 300 mm / min at 90° is also preferably 0.10 N / 10 mm or more, more preferably 0.20 N / 10 mm or more, further preferably 0.30 N / 10 mm or more, further preferably 0.40 N / 10 mm or more, and further preferably more than 0.50 N / 10 mm. By setting the thickness to be equal to or greater than the above lower limit, the protective film tends to be less likely to peel off during the thermoforming process.

[0046] In addition, the average peel strength (initial adhesion) when the protective film is peeled off at a moving speed of 300 mm / min and 90° in the unheated state of the multilayer body for hot bending processing is preferably 1.00 N / 10 mm or less, more preferably 0.80 N / 10 mm or less, further preferably 0.40 N / 10 mm or less, further preferably 0.30 N / 10 mm or less, and further preferably 0.25 N / 10 mm or less. By setting it below the above upper limit, the increase in adhesion after heating can often be effectively suppressed. In the unheated state of the multilayer body for hot bending processing, the average peel strength when the protective film is peeled off at a moving speed of 300 mm / min and 90° is also preferably 0.02 N / 10 mm or more, more preferably 0.05 N / 10 mm or more, further preferably 0.10 N / 10 mm or more, further preferably 0.15 N / 10 mm or more, and further preferably 0.2 N / 10 mm or more. By setting it above the above lower limit, the protective film is often not easy to peel off from the above thermoplastic resin.

[0047] The total thickness of the multilayer body for hot bending of this embodiment is preferably 100 μm or more, more preferably 200 μm or more, even more preferably 250 μm or more, and even more preferably 300 μm or more. Setting the thickness above the lower limit often ensures the rigidity of the molded body, such as the polarizer. Furthermore, the total thickness of the multilayer body for hot bending of this embodiment is preferably 3000 μm or less, more preferably 2000 μm or less, even more preferably 1000 μm or less, even more preferably 700 μm or less, and even more preferably 600 μm or less. Setting the thickness below the upper limit often further improves the thermoforming performance.

[0048] The total thickness of the protective film is preferably 10 μm or greater, more preferably 15 μm or greater, even more preferably 20 μm or greater, even more preferably 30 μm or greater, and even more preferably 40 μm or greater. Setting the thickness above the lower limit often further enhances the effect of suppressing suction cup marks during hot bending. The total thickness of the protective film is preferably 200 μm or less, more preferably 150 μm or less, even more preferably 125 μm or less, even more preferably 100 μm or less, and even more preferably 80 μm or less. Setting the thickness below the upper limit often further enhances the ability to follow the molded article during thermoforming.

[0049] <Layer Containing Thermoplastic Resin (Thermoplastic Resin Layer)>

[0050] The multilayer body for hot bending of this embodiment comprises a layer containing a thermoplastic resin (thermoplastic resin layer). The thermoplastic resin layer is the portion remaining on the molded body (e.g., a polarizer) after hot bending. Therefore, the type of thermoplastic resin layer can be appropriately selected depending on the intended use of the resulting molded body. The thermoplastic resin layer preferably has a mirror-finished surface.

[0051] As described above, the thermoplastic resin contained in the thermoplastic resin layer can be appropriately set depending on the intended use, but preferably contains at least one of polycarbonate, polyamide, and polyester, and more preferably contains polycarbonate.

[0052] In this embodiment, the polycarbonate preferably comprises a bisphenol polycarbonate. Bisphenol polycarbonate means that 80 mol% or more, preferably 90 mol% or more, more preferably 95 mol% or more of the structural units constituting the polycarbonate are carbonate structural units derived from bisphenol (preferably bisphenol A) and / or its derivatives.

[0053] The bisphenol polycarbonate is preferably bisphenol A polycarbonate.

[0054] The molecular weight of the polycarbonate is preferably, but not particularly limited to, 20,000 or more, more preferably 30,000 or more, in terms of weight average molecular weight. Furthermore, the weight average molecular weight is preferably 100,000 or less, more preferably 70,000 or less. By setting the weight average molecular weight above the lower limit, the strength of the resulting multilayer body for hot bending can be improved. Furthermore, by setting the weight average molecular weight below the upper limit, moldability is often improved.

[0055] In addition, in this embodiment, two or more polycarbonates having different weight average molecular weights may be mixed and used. In this case, the viscosity average molecular weight of the mixture is adopted.

[0056] The glass transition temperature (Tg) of the polycarbonate used in this embodiment is preferably 160°C or lower, more preferably 155°C or lower, further preferably 154°C or lower, further preferably 153°C or lower, further preferably 152°C or lower, and further preferably 151°C or lower. Furthermore, the glass transition temperature (Tg) of the polycarbonate used in this embodiment may be, for example, 140°C or higher, and may also be 143°C or higher, 145°C or higher, 147°C or higher, or 148°C or higher.

[0057] The glass transition temperature can be measured according to the description in paragraph 0056 of JP-A-2022-080270.

[0058] When the thermoplastic resin layer of the present embodiment contains two or more polycarbonates, the glass transition temperature of the polycarbonate is the sum of the values ​​obtained by multiplying the mass fraction by the glass transition temperature of each polycarbonate.

[0059] In addition, for details of the polycarbonate, reference can be made to paragraphs 0011 to 0020 of Japanese Patent Application Laid-Open No. 2012-144604 and paragraphs 0014 to 0035 of Japanese Patent Application Laid-Open No. 2019-002023, the contents of which are incorporated into this specification unless they depart from the gist of this embodiment.

[0060] Examples of the polyamide include aliphatic polyamides, alicyclic polyamides, semi-aromatic polyamides, and copolymers thereof, with alicyclic polyamides being preferred. Examples of the polyamide include GLILAMID TR FE5577, XE3805 (manufactured by EMS), NOVAMID X21 (manufactured by DSM), Toyobo Nylon T-714E (manufactured by Toyobo), G850 (manufactured by Arkema), and G850LV (manufactured by Arkema).

[0061] Examples of the polyester include polyesters obtained by a known method of subjecting a dicarboxylic acid component represented by 1,4-cyclohexanedicarboxylic acid, a diol component represented by 1,4-cyclohexanedimethanol, and optionally a small amount of other components to an esterification reaction or transesterification reaction, followed by adding a polymerization catalyst as appropriate and gradually reducing the pressure in the reaction vessel to carry out a polycondensation reaction.

[0062] In the thermoplastic resin layer, the thermoplastic resin preferably accounts for 85% by mass or more, more preferably 90% by mass or more, further preferably 95% by mass or more, further preferably 97% by mass or more, and further preferably 99% by mass or more.

[0063] In addition, the thermoplastic resin layer can comprise the composition other than the thermoplastic resin. As the composition other than the thermoplastic resin, antioxidant, releasing agent, ultraviolet absorber, heat stabilizer, flame retardant, flame retardant auxiliary, colorant, antistatic agent, fluorescent whitening agent, antifogging agent, flow improver, plasticizer, dispersant, antibacterial agent, antiblocking agent, impact improver, slip improver, hue improver, acid trap etc. can be comprised. When the thermoplastic resin layer contains the composition other than the thermoplastic resin, its content preferably adds up to 0.001~3 mass % of the thermoplastic resin layer.

[0064] The thickness of the thermoplastic resin layer is preferably 100 μm or greater, more preferably 200 μm or greater, and even more preferably 250 μm or greater. Setting the thickness above this lower limit often ensures the rigidity of the molded article, such as the polarizer. Furthermore, the thickness of the thermoplastic resin layer is preferably 3000 μm or less, more preferably 2000 μm or less, even more preferably 1000 μm or less, even more preferably 800 μm or less, and even more preferably 600 μm or less. Setting the thickness below this upper limit often improves hot bending properties.

[0065] <Layer Containing Polyolefin Having a Melting Point of 150° C. or Higher (Polyolefin Layer)>

[0066] The multilayer body for hot bending of this embodiment includes a layer (polyolefin layer) containing a polyolefin having a melting point of 150°C or higher. The use of a polyolefin having a melting point of 150°C or higher often further enhances the effect of suppressing suction cup marks on the protective film. Furthermore, the use of a polyolefin often further enhances the conformability during thermoforming.

[0067] The melting point of the polyolefin used in this embodiment is preferably 152°C or higher, more preferably 154°C or higher, even more preferably 157°C or higher, even more preferably 160°C or higher, and even more preferably 163°C or higher. The melting point of the polyolefin is measured as described in the Examples below. Furthermore, the melting point of the polyolefin used in this embodiment is preferably 200°C or lower, more preferably 180°C or lower, even more preferably 175°C or lower, even more preferably 170°C or lower, and even more preferably 168°C or lower. Setting the melting point below the upper limit often further improves the ability of the molded article to follow the hot bending process.

[0068] The melting point of the polyolefin used in this embodiment is preferably higher than the glass transition temperature of the thermoplastic resin contained in the thermoplastic resin layer, more preferably 5° C. or higher (preferably 50° C. or lower) than the glass transition temperature of the thermoplastic resin contained in the thermoplastic resin layer.

[0069] Furthermore, it is preferred that the melting point of the polyolefin used in the present embodiment is higher than the heat deflection temperature by 5° C. or more (preferably 10° C. or more and preferably 50° C. or less).

[0070] When the polyolefin layer in the present embodiment contains two or more polyolefins, or when two or more polyolefins are mixed, the highest melting point is defined as the melting point of the polyolefin.

[0071] The type of polyolefin contained in the polyolefin layer is preferably, but not particularly limited to, at least one of polyethylene, polypropylene, poly(ethylene / propylene), poly(4-methyl-1-pentene) and poly-1-butene, more preferably at least one of polyethylene, polypropylene and poly(ethylene / propylene), and even more preferably polypropylene.

[0072] It should be noted that polyethylene, polypropylene, etc. also include products in which a portion (for example, 10% by mass or less, preferably 5% by mass or less, more preferably 1% by mass or less) is modified with other olefins or other monomers.

[0073] The polyolefin content in the polyolefin layer is preferably 85% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 97% by mass or more, and even more preferably 99% by mass or more.

[0074] In addition, the polyolefin layer may further include components other than the polyolefin. As components other than the polyolefin, antioxidants, release agents, ultraviolet absorbers, heat stabilizers, flame retardants, flame retardant aids, colorants, antistatic agents, fluorescent whitening agents, antifogging agents, flow improvers, plasticizers, dispersants, antibacterial agents, antiblocking agents, impact improvers, slip improvers, hue improvers, acid traps, etc. may be included. When the polyolefin layer contains components other than the polyolefin, the content thereof preferably totals 0.001 to 3% by mass of the polyolefin layer.

[0075] The thickness of the polyolefin layer is preferably 5 μm or greater, more preferably 10 μm or greater, even more preferably 15 μm or greater, even more preferably 20 μm or greater, and even more preferably 30 μm or greater. Setting the thickness above the lower limit often further enhances the effectiveness of suppressing suction cup marks on the protective film. Furthermore, the thickness of the polyolefin layer is preferably 150 μm or less, more preferably 100 μm or less, even more preferably 90 μm or less, even more preferably 80 μm or less, and even more preferably 75 μm or less. Setting the thickness below the upper limit often further enhances the ability of the molded article to follow the hot bending process.

[0076] <Acrylic Adhesive Layer>

[0077] The multilayer body for hot bending of this embodiment includes an acrylic adhesive layer. The acrylic adhesive layer is a layer containing an acrylic adhesive. The acrylic adhesive has moderate adhesion to the thermoplastic resin layer and excellent releasability.

[0078] The weight average molecular weight of the acrylic pressure-sensitive adhesive is preferably 100,000 or more, more preferably 150,000 or more, further preferably 200,000 or more, and is preferably 1,000,000 or less.

[0079] An example of an acrylic adhesive contained in the acrylic adhesive layer is a polymer (acrylic resin) containing CH2=CH(COOR) (R is a substituent) as a main component, and optionally a monomer containing a functional group and other monomers. A polymerization initiator and a solvent may also be used in the synthesis of the polymer.

[0080] R in the CH2=CH(COOR) is preferably a linear or branched alkyl group having 1 to 15 carbon atoms, more preferably a linear or branched alkyl group having 1 to 10 carbon atoms, and still more preferably an ethyl group, a butyl group, and a 2-ethylhexyl group.

[0081] Examples of the functional group possessed by the functional group-containing monomer include -COOH, -OH, amino, and glycidyl groups. Preferred examples include -COOH, -OH, -NH2, monoalkylamino (alkyl group having 1 to 5 carbon atoms), dialkylamino (alkyl group having 1 to 5 carbon atoms), and glycidyl groups. More preferred examples include -COOH, -OH, -NH2, dimethylamino, and glycidyl groups. Specific examples of the functional group-containing monomer include (meth)acrylic acid, itaconic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, dimethylaminoethyl methacrylate, acrylamide, hydroxymethyl acrylamide, and glycidyl methacrylate. The molecular weight of the functional group-containing monomer is preferably 70 or more and preferably 200 or less.

[0082] Examples of the aforementioned other monomers, which are primarily used to supplement cohesive strength, include vinyl compounds. Specific examples include vinyl acetate, acrylonitrile, acrylamide, styrene, and methyl (meth)acrylate. The molecular weight of the other monomers is preferably 70 or greater and preferably 200 or less, more preferably 150 or less.

[0083] In the acrylic adhesive, the mass ratio of CH2=CH(COOR) (R is a substituent) as a raw material to the functional group-containing monomer and other monomers added as needed is preferably 100:0-90:0-90, more preferably 100:10-70:0-50.

[0084] The glass transition temperature of the acrylic adhesive layer is preferably above -80°C, but preferably below 0°C, and more preferably below -20°C. By using an acrylic adhesive layer with a room temperature temperature higher than its glass transition temperature, the acrylic adhesive layer becomes soft and has excellent adhesive properties. Methods for adjusting the glass transition temperature include controlling the molecular weight, adjusting the type of raw monomers used in the acrylic adhesive, and adding a crosslinking agent to the acrylic adhesive. The use of a crosslinking agent can increase the glass transition temperature, reduce adhesiveness, and improve releasability from the thermoplastic resin layer.

[0085] The content of the acrylic adhesive in the acrylic adhesive layer is preferably 85% by mass or more, more preferably 90% by mass or more, further preferably 95% by mass or more, further preferably 97% by mass or more, and still further preferably 99% by mass or more.

[0086] The acrylic adhesive layer may also contain ingredients other than the acrylic adhesive. Ingredients other than the acrylic adhesive may include antioxidants, release agents, ultraviolet absorbers, heat stabilizers, flame retardants, flame retardant aids, colorants, antistatic agents, fluorescent brighteners, antifogging agents, flow improvers, plasticizers, dispersants, antimicrobial agents, antiblocking agents, impact improvers, slip improvers, hue improvers, and acid scavengers. If the acrylic adhesive layer contains ingredients other than the acrylic adhesive, the total content of these ingredients is preferably 0.001 to 3% by mass of the acrylic adhesive layer.

[0087] The thickness of the acrylic adhesive layer is preferably 0.5 μm or greater, more preferably 1.0 μm or greater, even more preferably 1.5 μm or greater, even more preferably 2.0 μm or greater, and even more preferably 3.0 μm or greater. Furthermore, the thickness of the acrylic adhesive layer is preferably 10.0 μm or less, more preferably 8.0 μm or less, even more preferably 7.0 μm or less, even more preferably 6.0 μm or less, and even more preferably 5.0 μm or less. Setting the thickness below the upper limit often further enhances the effect of suppressing adhesive residue on the thermoplastic resin.

[0088] Polarizer

[0089] The multilayer body for heat bending according to the present embodiment is preferably used for the production of polarizers, particularly for the production of polarizers with protective films.

[0090] In the present embodiment, the polarizer is a sheet formed by stacking a thermoplastic resin layer, a polarizing film, and a thermoplastic resin layer in sequence. The thermoplastic resin layer plays the role of a polarizing film substrate of the polarizer and is usually bonded to the polarizing film with the aid of an adhesive. In the present embodiment, the thermoplastic resin layer on one side of the polarizer is the thermoplastic resin layer contained in the multilayer body for bending processing of the present embodiment. The thermoplastic resin layer on the other side of the polarizer can use a polarizing film substrate of a known (publicly known) polarizer, preferably the same as the thermoplastic resin layer described in the multilayer body part for hot bending processing of the present embodiment. The polarizing film can be a known product, and a polarizing film in which a polyvinyl alcohol (PVA) film is adsorbed or impregnated with iodine or a dichroic organic dye can be cited.

[0091] Known adhesives can be used as adhesives for bonding the thermoplastic resin layer and the polarizing film, and examples thereof include acrylic adhesives, polyurethane adhesives, epoxy resin adhesives, silicone adhesives, and polyvinyl alcohol adhesives, among which polyurethane adhesives are preferred.

[0092] The thickness of the adhesive is usually 1 μm or more and usually 30 μm or less.

[0093] In addition, in the present embodiment, the polarizer with a protective film refers to a sheet comprising a multilayer body for hot bending processing of the present embodiment, preferably a sheet having a multilayer body for hot bending processing of the present embodiment on the surface of at least one side of the polarizing film. More specifically, it is preferably a sheet in which the multilayer body for hot bending processing of the present embodiment, a polarizing film and other layers (for example, a multilayer body comprising a polarizing film substrate and a protective film) are stacked in sequence. The multilayer body for hot bending processing of the present embodiment is usually obtained by bonding a thermoplastic resin layer to a polarizing film, and the thermoplastic resin layer acts as a polarizing film substrate, and the protective film of the multilayer body for hot bending processing of the present embodiment acts as a protective film of the polarizer. When the polarizer is used, the protective film is peeled off before use. The other layers of the polarizer can be either the multilayer body for hot bending processing of the present embodiment or a known polarizing film substrate or protective film.

[0094] That is, the multilayer body for hot bending processing in this embodiment is preferably a multilayer body for hot bending processing having a layer containing a thermoplastic resin and a protective film arranged on the surface of the layer containing the thermoplastic resin, the protective film having a layer containing a polyolefin with a melting point of more than 150°C and an acrylic adhesive layer, the acrylic adhesive layer is in contact with the above-mentioned layer containing the thermoplastic resin, and the multilayer body for hot bending processing is heated at a temperature of 140°C for 15 minutes. When the protective film is peeled off at 90° at a moving speed of 300 mm / min, the average peel strength is less than 1.50 N / 10 mm. The multilayer body for hot bending processing is used for the manufacture of polarizers. When the polarizer is hot bent using a mold, the protective film is arranged on the side farther away from the mold than the polarizing film.

[0095] Figure 2 This is a schematic diagram of an example of a case where a polarizer is manufactured using the multilayer body for heat bending of the present embodiment, 1 represents the multilayer body for heat bending of the present embodiment, 6 represents the polarizing film, 7 represents other layers (for example, a multilayer body including a polarizing film substrate and a protective film), and 8 represents a mold. Figure 2 The multilayer body 1, polarizing film 6 and other layers 7 for medium heat bending are shown separately, but they are usually made into multilayer sheets and then arranged in a mold 8.

[0096] In this embodiment, the multilayer body 1 for hot bending of this embodiment is preferably configured so that one side of the protective film is concave ( Figure 2 on the opposite side of the arrow in the figure).

[0097] In addition, when a polarizer with a protective film (for example, the multilayer body 1 / polarizing film 6 / other layer 7 for hot bending processing in this embodiment) is hot bent using a mold 8, the protective film of the multilayer film 1 for hot bending processing in this embodiment is preferably arranged on a side farther away from the mold 8 than the polarizing film 6.

[0098] More specifically, a polarizer with a protective film (eg Figure 2 The polarizer with a protective film is preferably adsorbed onto and removed from the mold 8 by a convex mold. It should be noted that the convex mold used for adsorption to and removal from the mold is sometimes also referred to as a mold, but the mold in this embodiment is a mold having a casting mold with a desired hot-bend shape.

[0099] In this embodiment, the polarizer and the polarizer with a protective film are preferably used as polarizers used in liquid crystal display devices, polarized lenses (sunglasses, ski goggles, prescription glasses lenses, camera viewfinder lenses), covers of various instruments, car glass, train glass, polarizers for vehicle-mounted display panels and electronic equipment housings, vehicle-mounted rearview mirrors, silver mirrors for helmets, etc.

[0100] Example

[0101] The present invention will be described in more detail below with reference to the following examples. The materials, dosages, proportions, treatment contents, and treatment steps shown in the following examples may be modified as appropriate without departing from the gist of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below.

[0102] When the measuring instruments used in the examples are difficult to obtain due to discontinuation of production, other equipment with equivalent performance may be used for measurement.

[0103] In the following examples, the protective film located on the side away from the mold is referred to as protective film a, and the protective film located on the side in contact with the mold is referred to as protective film b. Furthermore, the layer with the higher adhesiveness of the two surfaces of each protective film is referred to as the adhesive layer, and the layer on the opposite side is referred to as the back layer. Furthermore, the layer of the protective film located between the adhesive layer and the back layer is referred to as the intermediate layer.

[0104] <Protective film a on the side away from the mold>

[0105] (a1) FM-315 manufactured by Daio Paper Industry Co., Ltd., two-layer structure (back layer: polypropylene (PP), adhesive layer: acrylic), total thickness: 45 μm (back layer: 40 μm, adhesive layer: 5 μm), initial adhesion to polycarbonate: 0.22 N / 10 mm, back layer melting point: 164°C

[0106] (a2) FM-503 manufactured by Daio Paper Industry Co., Ltd., double-layer structure (back layer: polypropylene, adhesive layer: acrylic), total thickness: 43 μm (back layer: 40 μm, adhesive layer: 3 μm), initial adhesion to polycarbonate: 0.12 N / 10 mm, back layer melting point: 165°C

[0107] (a3) EC-755 manufactured by Sumiron, double-layer structure (back layer: polypropylene, adhesive layer: acrylic), total thickness: 45 μm (back layer: 40 μm, adhesive layer: 5 μm), initial adhesion to polycarbonate: 0.17 N / 10 mm, back layer melting point: 165°C

[0108] (a4) T465J manufactured by Mitsui Chemicals Tocell Co., Ltd., double-layer structure (back layer: polypropylene, adhesive layer: acrylic), total thickness: 45 μm (back layer: 40 μm, adhesive layer: 5 μm), initial adhesion to polycarbonate: 0.43 N / 10 mm, back layer melting point: 165°C

[0109] (a5) T485J manufactured by Mitsui Chemicals Tocell Co., Ltd., double-layer structure (back layer: polypropylene, adhesive layer: acrylic), total thickness: 45 μm (back layer: 40 μm, adhesive layer: 5 μm), initial adhesion to polycarbonate: 0.13 N / 10 mm, back layer melting point: 165°C

[0110] (a6) FM-115 manufactured by Daio Paper Industry Co., Ltd., double-layer structure (back layer: polyethylene, adhesive layer: acrylic), total thickness: 65 μm (back layer: 60 μm, adhesive layer: 5 μm), initial adhesion to polycarbonate: 0.30 N / 10 mm, back layer melting point: 109°C

[0111] (a7) FM-358 manufactured by Daio Paper Industry Co., Ltd., double-layer structure (back layer: polypropylene, adhesive layer: acrylic), total thickness: 48 μm (back layer: 40 μm, adhesive layer: 8 μm), initial adhesion to polycarbonate: 1.45 N / 10 mm, back layer melting point: 164°C

[0112] (a8) MX308 manufactured by Matai Co., Ltd. of Japan, three-layer structure (back layer: polypropylene, middle layer: polyolefin, adhesive layer: polyethylene), total thickness: 69 μm (back layer: 11 μm, middle layer: 46 μm, adhesive layer: 12 μm), initial adhesion to polycarbonate: 1.45 N / 10 mm, back layer melting point: 164°C

[0113] (a9) CT50 manufactured by PANAC Corporation, double-layer structure (back layer: polyethylene terephthalate (PE), adhesive layer: acrylic), total thickness: 51 μm (back layer: 50 μm, adhesive layer: 1 μm), initial adhesion to polycarbonate: 0.08 N / 10 mm, back layer melting point: 255°C.

[0114] <Protective film b on the mold side>

[0115] 7H52: Made by Toray Film Processing Co., Ltd., the protective film has a three-layer structure (back layer: polypropylene, middle layer: polyolefin, adhesive layer: polyethylene), total thickness: 50μm, initial adhesion to polycarbonate: 0.06N / 10mm.

[0116] <Measurement of Melting Point>

[0117] The melting point (Tm) of the back layer of each protective film a was determined by performing two cycles of heating and cooling using differential scanning calorimetry (DSC) under the following conditions. The temperature during the second cycle of heating was measured, and the top of the endothermic peak was used as the melting point. The unit is expressed in °C.

[0118] Measurement starting temperature: 30°C, heating rate: 10°C / min, final temperature: 200°C (300°C for polyethylene terephthalate protective films only), cooling rate: 10°C / min. Units are expressed in °C.

[0119] A differential scanning calorimeter (DSC, "DSC7020" manufactured by Hitachi High-Tech Sciences, Ltd.) was used as a measurement apparatus.

[0120] <Preparation of Polarizing Film>

[0121] A polyvinyl alcohol film (manufactured by Kuraray Co., Ltd.) was swollen in 35°C water and then dyed with a 35°C aqueous solution containing the dichroic dyes Kayrus Blue G (CIBlue 78), Sumilite Red 4B (CIRed 81), and Chrysophenine (CIYellow 12), along with 10g / L of anhydrous sodium sulfate. The film was then immersed in a 35°C aqueous solution containing 2.5g / L nickel acetate and 5g / L boric acid and stretched to a final stretch ratio of 4x. While maintaining the film under tension, it was heat-treated at 110°C for 3 minutes to produce a 30μm polarizing film. The resulting polarizing film was stored in a low-humidity storage facility until the next step.

[0122] <Preparation of Polarizer>

[0123] A thermosetting polyurethane adhesive (BHS-6020A, manufactured by Toyo Morton Co., Ltd.) was applied to one side of a 300μm thick polycarbonate sheet (Mitsubishi Gas Chemical Co., Ltd., polycarbonate E-2000, retardation value: 4800) serving as the polarizing film substrate for the polarizer. The resulting polarizing film was laminated with the stretching axes aligned. The polycarbonate sheet was also laminated to the remaining side of the polarizing film with the stretching axes aligned. After lamination, the sheet was placed in a 70°C thermostat to cure the adhesive, resulting in a polarizer. The adhesive had a thickness of 10μm.

[0124] Examples 1 to 5, Comparative Examples 1 to 4

[0125] <Preparation of Multilayer Sheet>

[0126] Then, a laminating device (MP-630A, manufactured by MCK) was used to laminate protective film a onto one side of the polarizer, with its back layer being the outermost surface. Similarly, a laminating device was used to laminate protective film b (7H52, manufactured by Toray Film Processing Co., Ltd.) onto the opposite side of the polarizer, to obtain a multilayer sheet.

[0127] As lamination conditions, the upper and lower lamination rolls were set to 60° C., the lamination roll rotation speed was set to 1.5 m / min, and the lamination roll nip pressure was set to 0.5 MPa.

[0128] <Measurement of Initial Adhesion (Initial Average Peel Speed)>

[0129] The multilayer sheet obtained above was placed in a dryer with the protective film a as the upper surface and the protective film b as the lower surface, and dried at a temperature of 70°C for 24 hours. The multilayer sheet was then cut into a size of 50 mm wide × 100 mm long. Only the central 10 mm wide portion of the 50 mm lateral width of the protective film a in the multilayer sheet was retained, and the 20 mm wide portions on both sides were peeled off, forming a state in which the protective film a was attached to the polarizer with a size of 10 mm wide and 100 mm long. The average peel strength when the protective film a was peeled off at 90° from the multilayer sheet at a moving speed of 300 mm / min was then measured using a Tensilon universal material tester (manufactured by A&D). The average peel strength is the average value of the peel strength in the range of 20 to 40 mm when peeled to 50 mm. The unit is expressed in N / 10mm.

[0130] <Measurement of High-Temperature Adhesion (Average Peel Speed ​​After Heating at 140°C for 15 Minutes)>

[0131] The multilayer sheet obtained above was placed in a dryer with the protective film a as the upper surface and the protective film b as the lower surface, and dried at a temperature of 70°C for 24 hours. Then, only the central 10mm wide part of the lateral width of 50mm of the protective film a of the multilayer sheet was retained, and the 20mm wide parts on both sides were peeled off, forming a state in which the protective film a was attached to the polarizer with a size of 10mm wide and 100mm long. Then, the protective film a was placed in a dryer with the protective film a as the upper surface and the protective film b as the lower surface, and heated at a temperature of 140°C for 15 minutes. Then, the average peel strength of the protective film a when the protective film a was peeled off at a moving speed of 300mm / min at 90° was measured using a Tensilon universal material tester (manufactured by A&D). The average peel strength is the average value of the peel strength in the range of 20 to 40mm when peeled to 50mm. The unit is expressed in N / 10mm.

[0132] <Heat bending treatment of multilayer sheets>

[0133] The multilayer sheet is cut into a shape for binocular lenses. The multilayer sheet is then subjected to heat bending to obtain a heat-bent multilayer sheet. The heat bending process is performed as follows: After preheating the multilayer sheet with protective film a as the upper surface and protective film b as the lower surface using a preheating device, a suction cup is adsorbed on one side of protective film a using a suction cup arm, and the protective film b in the multilayer sheet is placed on a mold (metal die) having a local spherical surface with a specified temperature and a specified curvature in such a manner as to contact the mold (metal die). While pressing with a silicone rubber punch, the pressure is reduced and the sheet is adsorbed to the mold (metal die). The silicone rubber punch is then lifted, and the punched sheet adsorbed to the mold (metal die) is kept in a hot air environment at a specified temperature for a specified time. The suction cup is then adsorbed to the side of protective film a using a suction cup arm and removed from the mold (metal die), thereby completing the heat bending process. In the above process, the preheating of the multilayer sheet is set to an ambient temperature of 138°C, the mold (metal die) is a partial sphere equivalent to 9R (radius of about 58.3 mm), the surface temperature is 138°C, the pressing time of the silicone rubber punch is 2 seconds, and the adsorption time to the mold (metal die) is set to 9 minutes in an environment where the hot air temperature is blown out at 140°C.

[0134] <Peeling of protective film>

[0135] The protective film a of the multilayer sheet obtained after the heat bending treatment was visually checked for peeling. The evaluation was performed by 10 experts and judged by majority rule.

[0136] A: The protective film a did not peel off.

[0137] B: The protective film a could not follow the curvature of the polarizer, and was partially peeled off (less than 10% of the entire sheet area).

[0138] C: The protective film a could not follow the curvature of the polarizer, and was partially peeled off (more than 10% of the total area of ​​the sheet).

[0139] <Small wrinkles on protective film a>

[0140] The protective film a of the multilayer sheet obtained after heat bending was visually inspected for small wrinkles. These wrinkles were caused by thermal shrinkage of the protective film a. Ten experts performed the evaluation and judged by majority rule.

[0141] A: No wrinkles were found on the protective film.

[0142] B: Small wrinkles are found on the protective film.

[0143] <Suction cup marks on protective film a>

[0144] The heat-bent multilayer sheet was visually inspected for signs of suction cup marks on the protective film (a). Suction cup marks are marks left by the suction cup arm while the protective film (a) is heated above its melting point. Ten experts conducted the evaluation, using a majority vote.

[0145] A: No suction cup marks were found on the protective film a.

[0146] B: Suction cup marks were found on the protective film a.

[0147] <Ease of Peeling Protective Film a>

[0148] The ease of manually peeling the protective film a from the heat-bent multilayer sheet obtained above was evaluated. If the protective film a is difficult to peel, problems may arise during subsequent steps. Ten experts conducted the evaluation and made their own judgments.

[0149] A: All 10 people found it easy to peel off.

[0150] B: 7-9 out of 10 people feel that it is easy to peel off.

[0151] C: 5-6 out of 10 people felt that it was easy to peel off.

[0152] D: 4 or less out of 10 people felt that it was easy to peel off.

[0153] <Whitening of polarizers>

[0154] After peeling the protective film a from the heat-bending multilayer sheet, the polarizer surface was visually inspected for whitening. This whitening occurs when a portion of the acrylic adhesive layer of the protective film a remains on the polarizer surface after peeling the protective film a from the polarizer. Ten experts performed the evaluation, using a majority vote.

[0155] A: No whitening was found on the polarizer.

[0156] B: Whitening is found on the polarizer.

[0157] <Residue on the side of the multilayer sheet>

[0158] The side surfaces of the multilayer sheet obtained after heat bending were scratched with a fingernail to determine whether residue (fragments) remained on the sheet. When low-melting-point polyolefins are used for the polarizing film substrate and / or acrylic adhesive layer, this residue may remain on the side surfaces of the multilayer sheet during heat bending. This residue can cause white streaks during subsequent insert injection. The evaluation was conducted by 10 experts, with judgment based on majority rule.

[0159] A: No residue was found on the side of the multilayer tablet.

[0160] B: Residue was found on the side of the multilayer tablet.

[0161] <Comprehensive Evaluation>

[0162] Based on these evaluation results, a comprehensive performance evaluation of polarizers used in the manufacture of multilayer films for hot bending was conducted. The evaluation was conducted by ten experts each from manufacturers of multilayer films for hot bending, manufacturers of polarizers, and manufacturers of further processing using polarizers, with judgment based on a majority vote. The evaluation was graded from excellent to poor, with scores of S, A, B, C, and D being considered practically acceptable. A and above are considered acceptable.

[0163] [Table 1]

[0164]

[0165] [Table 2]

[0166]

[0167] The above results show that the multilayer body for heat bending of the present invention has excellent properties. In particular, it can be attached to a polarizer with a protective film, can be moderately heat-bent, and can be peeled off for use (Examples 1 to 5).

[0168] In contrast, when the polyolefin layer of the protective film had a lower melting point (Comparative Example 1), small wrinkles and suction cup marks were observed on Protective Film A. Furthermore, after peeling Protective Film A, residue was observed on the side of the multilayer sheet.

[0169] In addition, when the high-temperature adhesion was high (Comparative Example 2), the protective film a could not be peeled off appropriately.

[0170] When a polyethylene adhesive was used as the adhesive layer (Comparative Example 3), although the peeling ease of the protective film a was improved, small wrinkles were observed on the protective film a. In addition, after peeling the protective film a, the polarizer was observed to be white.

[0171] When the protective film a did not contain a polyolefin layer but contained a polyester layer (Comparative Example 4), the protective film a could not follow the bending during the heat bending process and partially peeled off.

[0172] Explanation of symbols

[0173] 1: Multilayer body for hot bending

[0174] 2: Thermoplastic resin layer

[0175] 3: Acrylic adhesive layer

[0176] 4: Polyolefin layer

[0177] 5: Protective film

[0178] 6: Polarizing film

[0179] 7: Other layers

[0180] 8: Mold.

Claims

1. A multilayer body for hot bending, characterized in that: A layer containing a thermoplastic resin and a protective film provided on a surface of the layer containing the thermoplastic resin, The protective film comprises a layer containing a polyolefin having a melting point of 150° C. or higher and an acrylic adhesive layer. The acrylic adhesive layer is in contact with the layer containing the thermoplastic resin, The multilayer body for hot bending was heated at 140° C. for 15 minutes, and then the protective film was peeled off at a moving speed of 300 mm / min at an angle of 90°, and the average peel strength was 1.50 N / 10 mm or less.

2. The multilayer body for hot bending according to claim 1, wherein: The polyolefin comprises polypropylene.

3. The multilayer body for hot bending according to claim 1 or 2, characterized in that: The thermoplastic resin includes at least one of polycarbonate, polyamide, and polyester.

4. The multilayer body for hot bending according to claim 1 or 2, characterized in that: The invention is used for performing heat bending treatment so that one side of the protective film becomes a concave portion when the multilayer body for heat bending is subjected to heat bending treatment.

5. The multilayer body for hot bending according to claim 1 or 2, characterized in that: The multilayer body for hot bending processing is used for manufacturing polarizers.

6. A multilayer body for hot bending, characterized in that: A layer containing a thermoplastic resin and a protective film provided on a surface of the layer containing the thermoplastic resin, The protective film comprises a layer containing a polyolefin having a melting point of 150° C. or higher and an acrylic adhesive layer. The acrylic adhesive layer is in contact with the layer containing the thermoplastic resin, The multilayer body for hot bending is heated at 140° C. for 15 minutes, and then the protective film is peeled off at a moving speed of 300 mm / min at 90°, and the average peel strength is less than 1.50 N / 10 mm. The multilayer body for heat bending is used for manufacturing a polarizer. When a mold is used to perform heat bending on the polarizer, the protective film is arranged on a side farther away from the mold than the polarizing film.

7. The multilayer body for hot bending according to claim 1 or 6, characterized in that: The polyolefin comprises polypropylene, The thermoplastic resin comprises at least one of polycarbonate, polyamide and polyester, The multilayer body for heat bending processing is used for a polarizer.

8. A polarizer with a protective film, characterized in that: The polarizer with a protective film comprises the multilayer body for heat bending according to claim 1, 2 or 6.

Images