JP2018083302A - Film wound layer body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel film wound layer body capable of suppressing generation of blocking when the film would layer body is re-wound, and further having no generation of wrinkle or breakage of a resin film (A) when a release film (C) is released.SOLUTION: There is proposed a film wound layer body by winding and layering a laminate film which has a resin film (A) including at least one of a layer containing an acrylic polymer or an alicyclic structure-containing polymer or a mixture of these polymers as a main component resin, an easily adhesive layer (B) laminated on one surface side of the resin film (A) and a release film (C) releasably laminated on another surface side of the resin film (A) with a roll shape, in which relation between interlayer release strength F1 (N/20 mm width) between the resin film (A) and the release film (C) and interlayer release strength F2 (N/20 mm width) between the release film (C) and the easily adhesive layer (B) satisfy that both of F1 and F2 are 0.01 to 1.0 and F2 is larger than F1.SELECTED DRAWING: None

Description

  The present invention relates to a film wound layer body provided with a resin film that can be used as, for example, a polarizer protective film.

In a liquid crystal display device, usually two polarizing plates are arranged on both sides of a liquid crystal cell.
The polarizing plate generally has a protective film bonded to both sides of a polarizer using a water-soluble adhesive such as polyvinyl alcohol.
As a polarizer, a film in which iodine or a dichroic dye is adsorbed on a film obtained by film-forming polyvinyl alcohol by a solution casting method and stretched in a boric acid solution has been generally used.

On the other hand, a cellulose film such as a triacetyl cellulose film has been widely used as a protective film to be bonded to a polarizer.
However, cellulosic films do not have sufficient durability, heat resistance, mechanical strength, etc., and polarizing plates using this as a polarizer protective film can be used in high-humidity heat environments, or the entire image display device can be made thinner. If the distance from a heat source such as a light source is reduced, the material may expand and deform, and the polarizing plate characteristics such as polarization degree and color difference may be impaired. Therefore, in recent years, as a material excellent in heat resistance, durability, and optical transparency, a film comprising an acrylic resin (referred to as “acrylic film”) and a film containing an alicyclic structure-containing polymer are polarizer protective films. It is attracting attention as.

  However, such a film has a poor affinity with a water-soluble adhesive used at the time of producing a polarizing plate compared to a cellulose-based film. It has been proposed to perform a hydrophilic treatment (corona discharge treatment or plasma treatment) or to provide an easy adhesion layer on the surface of the film (for example, Patent Documents 1 and 2).

  Patent Document 3 discloses a polyurethane and epoxy having a carboxyl group on a (meth) acrylic protective film containing a cross-linked elastic body in order to provide a polarizer protective film having excellent adhesion to a polarizer and excellent strength. It proposes to form an easy-adhesion layer comprising an easy-adhesive composition containing a group-containing crosslinking agent on a (meth) acrylic film.

JP 2007-127893 A JP 2008-216910 A JP 2016-33552 A

  Since the protective film to be bonded to the polarizer is thin, the film is likely to break due to the tension applied during the production line, the yield may decrease, and the bonding operation becomes difficult. There was also a problem of poor handling. Therefore, the inventors can laminate the release film on the protective film before the bonding work, and peel off the release film at the time of manufacturing the polarizing plate using the protective film. The film winding layer was examined.

  However, when an easy adhesion layer is formed on one side of the polarizer protective film and a release film is laminated on the other side, the laminated film is wound into a roll shape to form a film winding layer body. When the film is rewound, the laminated films are brought into close contact with each other due to the adhesion between the easy-adhesion layer and the release film, resulting in blocking that prevents slipping or peeling, and the protective film surface is whitened or the surface or edges Some abnormalities such as cracks may occur in the part. Further, when the film wound layer is rewound to produce a polarizing plate, the protective film may be wrinkled or torn when the release film is peeled off.

  Therefore, the present invention comprises an easy-adhesion layer (B) on one surface of a resin film (A) that can be used as a protective film, and a release film (C) is laminated on the other surface of the resin film (A). Regarding a film winding layer formed by winding a laminated film having a configuration into a roll shape, when the film winding layer is rewound while ensuring high adhesion in bonding with a polarizer by an easy adhesion layer In addition, it is possible to suppress the occurrence of blocking where the films are in close contact with each other and become difficult to slip or cannot be peeled off. Moreover, when the release film (C) is peeled off, the resin film (A) is wrinkled or torn. It is intended to provide a new film-wrapped layer body in which no occurrence occurs.

The present invention provides a resin film (A) including at least one layer containing an acrylic polymer, an alicyclic structure-containing polymer, or a mixture of these polymers as a main component resin, on one side of the resin film (A). A laminated film comprising an easy-adhesion layer (B) that is laminated and a release film (C) that is releasably laminated on the other side of the resin film (A) is wound into a roll. A film winding layer body,
The release film (C) has a base material layer (C1) and an adhesive layer (C2),
Delamination strength F1 (N / 20 mm width) between the resin film (A) and the release film (C) and delamination strength F2 (N / 20 mm width) between the release film (C) and the easy adhesion layer (B) ), The film winding layer body is characterized in that F1 and F2 are both 0.01 or more and 1.0 or less, and F2 is larger than F1.

  According to the film wound layer proposed by the present invention, when the film wound layer is rewound while securing high adhesiveness in bonding with a polarizer by the easy adhesion layer, the films adhere to each other. In addition, it is possible to suppress the occurrence of blocking, which makes it difficult to slip or to peel off, and to suppress the occurrence of wrinkles and tears in the resin film (A) when the release film (C) is peeled off. Can do.

  Next, the present invention will be described based on an embodiment. However, the present invention is not limited to the embodiment described below.

<This film roll layer>
The film winding layer body (referred to as “the present film winding layer body”) according to an example of the embodiment of the present invention is a resin film (A) and an easy adhesion layer laminated on one surface side of the resin film (A). (B) and a release film (C) laminated on the other side of the resin film (A), that is, the opposite side of the one side, (hereinafter referred to as “the present laminate film”). It is a film winding layer body formed by winding in a roll shape.

In this film wound layer body, the winding tension per 1 m film width, that is, the winding tension, is preferably 10 N / m width or more and 200 N / m width or less.
A winding tension of 10 or more and 200 N / m or less is preferable because it does not cause winding deviation, bulge, or even wrinkle, and can reduce an increase in phase difference due to film orientation due to tension.
From this point of view, in this film wound layer body, the winding tension per 1 m of film width is preferably 10 or more and 200 N / m width or less, more preferably 20 N / m width or more or 150 N / m width or less. preferable.

In this film wound layer body, the delamination strength F1 (N / 20 mm width) between the resin film (A) and the release film (C) and the interlayer between the release film (C) and the easy adhesion layer (B). Regarding the relationship with the peel strength F2 (N / 20 mm width), both F1 and F2 are preferably 0.01 or more and 1.0 or less, and F2 is preferably larger than F1.
At this time, the delamination strength F1 between the resin film (A) and the release film (C) is the delamination strength F1 between the resin film (A) and the release film (C) in the laminated film of the same winding. Is the meaning.
Moreover, the delamination strength F2 between the release film (C) and the easy-adhesion layer (B) is the same as that of the release film (C) and the laminated film adjacent to the laminate film of the release film (C). This means the delamination strength F2 with the easy adhesion layer (B).

For example, in a film wound layer of a laminated structure such as a release film (C) / easy-adhesive layer (B) / resin film (A), in order to be able to unwind smoothly, delamination between adjacent laminated films It is common to increase the delamination strength in the laminated film rather than the strength.
On the other hand, in this film winding layered body, the delamination between the release film (C) and the easy adhesion layer (B) is greater than the delamination strength F1 between the resin film (A) and the release film (C). By increasing the strength F2 and setting both F1 and F2 to 0.01 or more and 1.0 or less, when the film wound layer body is rewound, the films are in close contact with each other and become difficult to slip or peel off. It is possible to suppress the occurrence of blocking, and when peeling the release film (C), it is possible to suppress the occurrence of wrinkles and tears in the resin film (A). There is.

  Further, the delamination strength F1 (N / 20 mm width) between the resin film (A) and the release film (C) is preferably 0.01 or more and 0.1 or less. It is more preferable that it is 09 or less, and it is further more preferable that it is especially 0.03 or more or 0.08 or less among them.

  As will be described later, in order to make F1 in the above range, it is preferable that the release film (C) has an adhesive layer on the surface side in contact with the resin film (A). Moreover, when forming an easily bonding layer (B) with respect to the resin film (A) which bonded the release film (C) previously, it is preferable that the drying temperature shall be less than 110 degreeC. However, it is not limited to these methods.

The delamination strength F2 (N / 20 mm width) between the release film (C) and the easy-adhesion layer (B) is preferably 0.01 or more and 1.0 or less, and more preferably 0.02 or more or 0 Is more preferably 0.08 or less, and particularly preferably 0.03 or more or 0.6 or less.
As will be described later, the thickness and hardness (storage modulus) of the easy-adhesion layer (B) may be adjusted in order to bring F2 into the above range. However, it is not limited to these methods.

  Furthermore, in this film wound layer body, the delamination strength F1 (N / 20 mm width) between the resin film (A) and the release film (C), and the release film (C) and the easy adhesion layer (B). The difference (F2−F1) in the delamination strength F2 (N / 20 mm width) is preferably 0.01 or more and 0.05 or less, and more preferably 0.01 or more and 0.03 or less.

The delamination strength F3 (N / 20 mm width) between the resin film (A) and the easy-adhesion layer (B) is not particularly limited as long as the easy-adhesion layer is formed on the resin film and does not peel off each other. It is preferably 0 or more and 10 or less, more preferably 1.5 or more or 9.0 or less, and particularly preferably 2.0 or more or 8.0 or less.
In order to adjust the delamination strength F3 between the resin film (A) and the easy adhesion layer (B), the thickness and hardness (storage elastic modulus) of the easy adhesion layer (B) can be adjusted. The composition of B) may be adjusted. However, it is not limited to this method.

As the resin composition constituting the easy-adhesion layer (B), as described later, a resin composition that can be bonded to a PVA film using a water-soluble adhesive is preferable, among which a urethane group, an amide group, or A resin composition mainly containing a polymer having an NCO group is preferred, and a resin composition mainly containing a urethane resin is particularly preferred.
Moreover, as a urethane-type resin which makes main component resin of an easily bonding layer (B), it is excellent in heat resistance and water resistance so that it may form the easily bonding layer which has the optimal storage elastic modulus in this invention so that it may mention later. Since it can do, what has an aliphatic polycarbonate frame | skeleton, specifically, the urethane-type resin obtained by reaction of an aliphatic polycarbonate polyol, an aliphatic diisocyanate compound, and / or an alicyclic diisocyanate compound is preferable.

  The delamination strengths F1 and F2 can be measured according to JIS-Z0237 (2009), as shown in the examples described later.

<Resin film (A)>
The resin film (A) is an acrylic polymer or an alicyclic structure-containing polymer or a polymer having excellent transparency, low birefringence, low water absorption, and heat resistance required for use as a polarizer protective film. At least one layer containing a mixture of these polymers as a main component resin is included. For example, a polarizer protective film constituting a polarizing plate, that is, a resin film that can be used as a polarizer protective film bonded to both sides of the polarizer can be preferably used. However, the present invention is not limited to this.

The thickness of the resin film (A) is preferably 3 μm or more and 80 μm or less. If it is 3 μm or more, it is preferable because deformation due to contraction of the polarizer in the polarizing plate and transmission of moisture in the air to the polarizer can be suppressed. On the other hand, if it is 80 μm or less, the polarizing plate can be reduced in weight and thickness. Therefore, it is preferable.
From this viewpoint, the thickness of the resin film (A) is preferably 3 μm or more and 80 μm or less, more preferably 5 μm or more or 40 μm or less, and particularly preferably 10 μm or more or 30 μm or less.

  If necessary, the surface of the resin film (A) may be activated by boric acid treatment to increase the adhesive force, or may be subjected to plasma treatment or corona treatment.

  As the main component resin constituting the resin film (A), an acrylic polymer, an alicyclic structure-containing polymer, or a mixture thereof is selected from the viewpoint of excellent heat resistance, durability, and optical transparency. Is preferred.

The resin film (A) has a delamination strength F1 (N / 20 mm width) between the resin film (A) and the release film (C), and an delamination between the release film (C) and the easy adhesion layer (B). Regarding the relationship with the strength F2 (N / 20 mm width), F1 and F2 are both 0.01 or more and 1.0 or less, and there is no particular limitation as long as the relationship that F2 is larger than F1 is satisfied. A layer containing the main component resin (also referred to as “acrylic resin layer”), a layer containing the alicyclic structure-containing polymer as the main component resin (also referred to as “alicyclic structure resin layer”), or their weight It may be a single-layer film composed of a layer containing a mixture mixture as a main component resin (also referred to as “acrylic / alicyclic structure resin layer”), or these acrylic resin layer, alicyclic structure resin layer, and acrylic・ Alicyclic structure tree It may be a multilayer film comprising one layer or a plurality of the layers.
The multilayer film may be a multilayer of two layers, three layers, four layers or more.

In the case where the resin film (A) is a multilayer film, the acrylic resin layer, the alicyclic structure resin layer, or the acrylic / aliphatic resin layer can be easily adjusted in the above-described ranges. A multilayer film provided with a cyclic structure resin layer as the outermost surface layer is preferred.
When the resin film (A) is a multilayer film, other layers other than the acrylic resin layer, the alicyclic structure resin layer, and the acrylic / alicyclic structure resin layer may be provided. For example, cellulose esters such as polyethylene, polypropylene, cellulose, cellulose diacetate, cellulose acetate butyrate, cellulose acetate phthalate, cellulose acetate propionate, cellulose triacetate, cellulose nitrate, or derivatives thereof, polyethylene terephthalate, polyethylene naphthalate, etc. Polyester, polyvinylidene chloride, polyvinyl alcohol, ethylene vinyl alcohol, syndiotactic polystyrene, polycarbonate, norbornene resin, polymethylpentene, polyetherke Emissions, polyether sulfone, polysulfone, polyether ketone imide, polyamide, fluororesin, nylon, acrylic or polyarylate such as polymethyl methacrylate can be mentioned films containing as a main component resin.

  When the resin film (A) is a multilayer film, preferably an acrylic resin layer / alicyclic structure resin layer / acrylic resin layer, an acrylic resin layer / cyclic olefin resin layer / acrylic resin layer, an alicyclic structure resin layer Examples thereof include a multilayer film having a laminated structure such as / polycarbonate resin layer / alicyclic structure resin layer, or alicyclic structure resin layer / acrylic resin layer / alicyclic structure resin layer.

Among these, the multilayer film provided with the acrylic resin layer as the outermost surface layer is preferable.
In particular, a three-layer film composed of acrylic resin layer / alicyclic structure resin layer / acrylic resin layer is preferable.

(Acrylic resin layer)
The said acrylic resin layer should just be a layer which contains the acrylic polymer demonstrated below as main component resin. Therefore, the acrylic resin layer may contain a resin component other than the acrylic polymer, or may contain a component other than the resin.
However, since the main component resin of the acrylic resin layer is an acrylic polymer, it is preferable that the acrylic polymer occupies 50% by mass or more of the resin contained in the acrylic resin layer, particularly 80% by mass or more, of which 90% by mass. It is particularly preferred that the acrylic polymer occupies at least% (including 100% by mass).

  Specifically, the acrylic resin layer may contain an appropriate amount of, for example, an ultraviolet absorber, a silane coupling agent, an antioxidant, a weather resistance stabilizer, a flexibility modifier, and other various additives.

The flexibility modifier is not particularly defined. For example, rubber elastic fine particles and soft resin can be used. From the viewpoint of transparency and optical properties, it is preferable to select a soft resin as the flexibility modifier.
Examples of the soft resin include a product name “Clarity” manufactured by Kuraray Co., Ltd. and a product name “NANOSTRENGTH” manufactured by Arkema Co., Ltd.

  From the viewpoint of flexibility, the flexibility modifier is preferably contained in an amount of 1% by weight or more, more preferably 5% by weight or more based on the acrylic polymer in the acrylic resin layer. More preferably, it is contained by weight% or more. Further, the upper limit of the content of the flexibility modifier is not particularly defined, but is usually 50% by weight or less.

(Acrylic polymer)
The acrylic polymer constituting the main component resin of the acrylic resin layer may be a polymer containing acrylic acid, methacrylic acid or a derivative thereof as a monomer component. Among these, an acrylic polymer as a thermoplastic resin is preferable.

  Examples of the acrylic monomer constituting the acrylic polymer include methyl methacrylate, methacrylic acid, acrylic acid, benzyl (meth) acrylate, n-butyl (meth) acrylate, i-butyl (meth) acrylate, t- Butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, tridecyl (meth) acrylate, stearyl (meth) acrylate, glycidyl (meth) acrylate, hydroxypropyl (meth) acrylate, 2-methoxyethyl ( (Meth) acrylate, 2-ethoxyethyl (meth) acrylate, cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, norbornyl (meth) acrylate, dicyclopentenyl (meth) acrylate, disi Lopentanyl (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, acrylic (meth) acrylate, 2-hydroxyethyl (meth) acrylate, succinic acid-2- (meth) acryloyloxy Ethyl, maleic acid-2- (meth) acryloyloxyethyl, phthalic acid-2- (meth) acryloyloxyethyl, hexahydrophthalic acid-2- (meth) acryloyloxyethyl, pentamethylpiperidyl (meth) acrylate , Tetramethylpiperidyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, and the like. These may be used by polymerizing alone or in combination of two or more. In addition, it may be a copolymer with one or more of other monomers copolymerizable with these acrylic monomers, such as polyolefin monomers, vinyl monomers and the like. .

  In the present specification, “(meth) acryl” includes both “acryl” and “methacryl”. The same applies to “(meth) acrylate” and “(meth) acryloyl”.

  The molecular weight of the acrylic polymer is not particularly limited. For example, when the weight average molecular weight is in the range of 30,000 to 300,000, it is possible to provide a film having excellent mechanical properties and heat resistance without causing appearance defects such as flow unevenness during molding.

The glass transition temperature of the acrylic polymer measured at a heating rate of 10 ° C./min according to JIS K7122 is not particularly limited. For example, from the viewpoint of heat resistance of the obtained film, 80 ° C. or higher is preferable, 90 ° C. or higher is more preferable, and 100 ° C. or higher is more preferable.
In addition, the upper limit of the glass transition temperature of the acrylic polymer is not particularly defined. However, it is usually about 140 ° C. Moreover, if the glass transition temperature of an acrylic polymer is less than 120 degreeC, since a general purpose resin can be used, it is preferable from a viewpoint that the selection range of a raw material spreads. On the other hand, when higher heat resistance is required, the glass transition temperature is preferably 120 ° C. or higher.

  MFR, which is an index of melt viscosity of the acrylic polymer, is a value measured at a temperature of 230 ° C. and a load of 37.27 N in accordance with JIS-K7210, and is usually 1.0 g / 10 min to 50 g / 10 min. Among them, it is preferably 5 g / 10 min or more or 30 g / 10 min or less, more preferably 8 g / 10 min or more or 20 g / 10 min or less.

(Alicyclic structure resin layer)
As a layer contained in the resin film (A) at least one layer, instead of the acrylic resin layer, it has the same transparency as the acrylic resin, has low birefringence, and low water absorption, and An alicyclic structure layer containing an alicyclic structure-containing polymer as a main component can be employed because it has higher heat resistance than an acrylic resin. The alicyclic structure resin layer may contain a resin component other than the alicyclic structure-containing polymer, or may contain a component other than the resin.
However, since the main component resin of the alicyclic structure resin layer is an alicyclic structure-containing polymer, 50% by mass or more of the resin included in the alicyclic structure resin layer is occupied by the alicyclic structure-containing polymer. Among them, it is particularly preferable that the alicyclic structure-containing polymer accounts for 80% by mass or more, particularly 90% by mass or more (including 100% by mass).

  Specifically, the alicyclic structure resin layer may contain an appropriate amount of, for example, an ultraviolet absorber, a silane coupling agent, an antioxidant, a weathering stabilizer, and other various additives.

  As said ultraviolet absorber, a well-known thing, for example, various commercially available things, can be especially used without a restriction | limiting. Especially, what can be normally used for the addition to well-known aromatic polycarbonate resin can be used conveniently.

  Examples of the ultraviolet absorber include 2- (2′-hydroxy-5′-tert-octylphenyl) benzotriazole and 2- (3-tert-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzo. Triazole, 2- (5-methyl-2-hydroxyphenyl) benzotriazole, 2- [2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole and 2,2′- Benzotriazole ultraviolet absorbers such as methylenebis (4-cumyl-6-benzotriazolephenyl); benzoxazine ultraviolet absorbers such as 2,2′-p-phenylenebis (1,3-benzoxazin-4-one) 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5- (hexyl) oxy-pheno; And the like, and the like.

  The melting point of the ultraviolet absorber is particularly preferably in the range of 120 ° C. or higher and 250 ° C. or lower. When using a UV absorber with a melting point of 120 ° C. or higher, the film surface becomes dirty due to a bleed-out phenomenon in which the UV absorber aggregates on the film surface over time, or when forming a film using a die or a metal roll, Bleed-out prevents them from becoming dirty and reduces and improves film surface haze.

  From these viewpoints, as the ultraviolet absorber, 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- (2′-hydroxy-3′-tert-butyl-5′-methylphenyl)- 5-chlorobenzotriazole, 2- [2′-hydroxy-3 ′-(3 ″, 4 ″, 5 ″, 6 ″ -tetrahydrophthalimidomethyl) -5′-methylphenyl] benzotriazole, 2,2-methylenebis [ 4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl)] phenol and 2- (2-hydroxy-3,5-dicumylphenyl) benzotriazole Benzotriazole ultraviolet absorber and 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5- (hexyl) oxy-pheno It can be preferably used hydroxyphenyl triazine-based UV absorbers such as Le.

Among these, 2- (2-hydroxy-3,5-dicumylphenyl) benzotriazole, 2,2-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzo Triazol-2-yl)] phenol, 2- (4,6-diphenyl-1,3, -triazin-2-yl) -5- (hexyl) oxy-phenol are particularly preferred.
These ultraviolet absorbers may be used alone or in combination of two or more.

The ultraviolet absorber is preferably added in an amount of 0.0001 parts by weight or more and 20 parts by weight or less with respect to 100 parts by weight of the alicyclic structure-containing polymer in the alicyclic structure resin layer. More preferably, it is added at a ratio of 0005 parts by weight or more and 15 parts by weight or less, and more preferably at a ratio of 0.001 part by weight or more and 10 parts by weight or less.
By adding the ultraviolet absorber within such a range, the weather resistance of the film can be improved without causing bleeding of the ultraviolet absorber to the surface of the alicyclic structure resin layer and deterioration of mechanical properties.

(Aricyclic structure-containing polymer)
The alicyclic structure-containing polymer forming the main component resin of the alicyclic structure layer may be a polymer having an alicyclic structure in the repeating unit of the polymer, for example, having an alicyclic structure in the main chain. Either a polymer or a polymer having an alicyclic structure in the side chain may be used.

  An alicyclic structure containing polymer may be contained individually by 1 type, and may be used combining two or more types by arbitrary ratios. Among these, a polymer containing an alicyclic structure in the main chain is preferable from the viewpoint of mechanical strength, heat resistance, and the like.

  Examples of the alicyclic structure include a saturated alicyclic hydrocarbon (cycloalkane) structure and an unsaturated alicyclic hydrocarbon (cycloalkene, cycloalkyne) structure. Among these, from the viewpoints of mechanical strength, heat resistance and the like, a cycloalkane structure and a cycloalkene structure are preferable, and a cycloalkane structure is particularly preferable.

  The number of carbon atoms constituting the alicyclic structure is preferably 4 or more, more preferably 5 or more, preferably 30 or less, more preferably 20 or less, particularly preferably per alicyclic structure. 15 or less. If the carbon number is within this range, the mechanical strength, heat resistance, and moldability of the base material layer are highly balanced, which is preferable.

  The ratio of the repeating unit having an alicyclic structure in the polymer resin having an alicyclic structure is not particularly limited as long as the glass transition temperature is 80 ° C. or higher. Usually, it is 30% by weight or more, preferably 50% by weight or more. It is preferable to make the repeating unit having an alicyclic structure in this range because heat resistance can be improved and optical properties can be adjusted.

  Specific examples of the alicyclic structure-containing polymer resin include (1) a copolymer of a cyclic ether and an alicyclic dihydroxy compound, (2) a norbornene polymer, (3) a monocyclic olefin polymer, (4) Cyclic conjugated diene polymers, (5) vinyl alicyclic hydrocarbon polymers, and hydrogenated products thereof. Among these, from the viewpoint of transparency and moldability, a copolymer of a cyclic ether and an alicyclic dihydroxy compound described later, a norbornene polymer, and hydrogenated products thereof are more preferable.

(1) Copolymer of cyclic ether and alicyclic dihydroxy compound As the alicyclic structure-containing polymer, the alicyclic structure has particularly high transparency, high strength, high heat resistance, high weather resistance, etc. For the purpose of imparting, a polymer containing another structure is preferable. Especially, what has an aliphatic polycarbonate frame | skeleton is preferable, and especially the polycarbonate resin containing the structural unit derived from the dihydroxy compound which has a site | part represented by following formula (1) in a part of structure is preferable.

  More specifically, examples of the dihydroxy compound represented by the above formula (1) include isosorbide, isomannide and isoidet which are in a stereoisomeric relationship.

  The dihydroxy compound represented by the formula (1) is an ether diol that can be produced from a saccharide using a biogenic material as a raw material. In particular, isosorbide can be produced at low cost by hydrogenating and then dehydrating D-glucose obtained from starch, and can be obtained in abundant resources. Under these circumstances, isosorbide is most preferable as the dihydroxy compound represented by the above formula (1).

  The polycarbonate resin as the alicyclic structure-containing polymer is a structure derived from a dihydroxy compound having a structural unit other than the structural unit derived from the dihydroxy compound having the site represented by the formula (1) and the alicyclic structure. A polymer containing units.

  More specifically, for example, structural units derived from the alicyclic dihydroxy compounds described in International Publication No. 2007/148604 can be mentioned.

  Among the structural units derived from the alicyclic dihydroxy compound, those containing a 5-membered ring structure or a 6-membered ring structure are preferable. The six-membered ring structure may be fixed in a chair shape or a boat shape by a covalent bond.

  By including a structural unit derived from an alicyclic dihydroxy compound having a 5-membered ring structure or a 6-membered ring structure, the heat resistance of the obtained polycarbonate resin can be increased.

  The number of carbon atoms contained in the alicyclic dihydroxy compound is usually preferably 70 or less, more preferably 50 or less, and even more preferably 30 or less.

  Examples of the alicyclic dihydroxy compound containing the 5-membered ring structure or the 6-membered ring structure include those described in the above-mentioned International Publication No. 2007/148604.

  Among these, cyclohexane dimethanol, tricyclodecane dimethanol, adamantanediol, and pentacyclopentadecane dimethanol can be preferably exemplified. Among these, cyclohexane dimethanol or tricyclodecane dimethanol is more preferable in view of economy and heat resistance. In particular, it is most preferable to contain a structural unit derived from tricyclodecane dimethanol represented by the following formula (2) from the viewpoint of balance between economic efficiency, heat resistance and optical properties.

  In addition, these other structural units may contain only 1 type in polycarbonate resin, and may contain 2 or more types.

  The content ratio of the structural unit derived from the dihydroxy compound having the site represented by the formula (1) in a part of the structure of the polycarbonate resin is based on the structural unit derived from all the dihydroxy compounds in the polycarbonate resin. It is preferably 30 mol% or more, more preferably 40 mol% or more, particularly preferably 50 mol% or more, and preferably 90 mol% or less, more preferably 80 mol% or less.

  If the content ratio of the structural unit derived from the dihydroxy compound having the site represented by the formula (1) in a part of the structure of the polycarbonate resin is equal to or higher than the lower limit, the heat resistance is improved by maintaining the glass transition temperature. Is preferable. On the other hand, by being below the above upper limit, coloring derived from a carbonate structure, coloring derived from impurities contained in a trace amount because a biogenic substance is used as a raw material, and the like are normally required for a base material layer. There is a possibility that transparency is not impaired. In addition, appropriate molding processability, mechanical strength and heat resistance, which are difficult to achieve with a polycarbonate resin composed only of a structural unit derived from a dihydroxy compound having a site represented by the above formula (1) in a part of the structure. You can balance gender.

  The polycarbonate resin comprises a structural unit derived from a dihydroxy compound having a site represented by the formula (1) in a part of the structure, and a structural unit derived from an alicyclic dihydroxy compound and an aliphatic hydroxy compound. Although it is preferable, a structural unit derived from a dihydroxy compound other than those may be further contained within the range not impairing the object of the present invention.

  The polycarbonate resin can be produced by a generally used polymerization method. The method for producing the polycarbonate resin may be either a phosgene method or a transesterification method in which it is reacted with a carbonic acid diester. Among them, in the presence of a polymerization catalyst, a dihydroxy compound having a site represented by the above formula (1) in a part of the structure, an alicyclic and aliphatic dihydroxy compound, and other that can be used as necessary A transesterification method in which a dihydroxy compound is reacted with a carbonic acid diester is preferred.

  The transesterification method requires one or more dihydroxy compounds having a site represented by the formula (1) in a part of the structure, one or more alicyclic and dihydroxy compounds, and Manufacture of transesterification by adding a basic catalyst and further an acidic substance neutralizing this basic catalyst to one or more of other dihydroxy compounds that can be used depending on the type and carbonic acid diester Is the method.

  Representative examples of carbonic acid diesters include diphenyl carbonate, ditolyl carbonate, bis (chlorophenyl) carbonate, m-cresyl carbonate, dinaphthyl carbonate, bis (biphenyl) carbonate, diethyl carbonate, dimethyl carbonate, dibutyl carbonate, and dicyclohexyl carbonate. Can be mentioned. These may be used alone or in combination of two or more. Of these, diphenyl carbonate can be particularly preferably used.

The molecular weight of the polycarbonate resin can be represented by a reduced viscosity. If the reduced viscosity of the polycarbonate resin is too low, the mechanical strength of the molded product may be small. Conversely, if the polycarbonate resin is too large, the fluidity at the time of molding tends to decrease, and the productivity and moldability tend to decrease. .
From this viewpoint, the lower limit of the reduced viscosity of the polycarbonate resin is preferably 0.20 dl / g or more, more preferably 0.30 dL / g or more, still more preferably 0.35 dL / g or more, and the upper limit of the reduced viscosity is 2. 00 dL / g or less is preferable.

The reduced viscosity of the polycarbonate resin is precisely adjusted so that the concentration of the polycarbonate resin is 0.60 g / dl using an Ubbelohde viscometer with a DT-504 type automatic viscometer manufactured by Chuo Rika Co., Ltd. After the adjustment, the temperature is calculated from the measured value based on the following at a temperature of 20.0 ° C. ± 0.1 ° C.
From the passage time t0 of the solvent and the passage time t of the solution, the following formula:
η _rel = t / t ₀
More seek relative viscosity eta _rel, from the relative viscosity eta _rel, the formula:
η _sp = (η−η ₀ ) / η ₀ = _ηrel −1
The specific viscosity η _sp is then determined.
By dividing the specific viscosity η _sp by the concentration c (g / dl), the following formula:
η _red = η _sp / c
From this, the reduced viscosity (converted viscosity) η _red is determined.

(2) Norbornene polymer As the norbornene polymer, for example, a ring-opening polymer of a monomer having a norbornene structure, a ring-opening copolymer of a monomer having a norbornene structure and another monomer, or those Hydrides of these monomers; addition polymers of monomers having a norbornene structure, addition copolymers of monomers having a norbornene structure and other monomers, or hydrides thereof; and the like. Among these, a ring-opening (co) polymer hydride of a monomer having a norbornene structure is particularly suitable from the viewpoints of transparency, moldability, heat resistance, low hygroscopicity, dimensional stability, lightness, and the like. It is.
In this specification, “(co) polymer” refers to a polymer and a copolymer.

  Examples of the monomer having the norbornene structure include bicyclo [2.2.1] hept-2-ene (common name: norbornene), tricyclo [4.3.0.12,5] deca-3,7. -Diene (common name: dicyclopentadiene), 7,8-benzotricyclo [4.3.0.12,5] dec-3-ene (common name: methanotetrahydrofluorene), tetracyclo [4.4.0 .12, 5.17, 10] dodec-3-ene (common name: tetracyclododecene), and derivatives of these compounds (for example, those having a substituent in the ring). Here, examples of the substituent include an alkyl group, an alkylene group, and a polar group. Moreover, these substituents may be the same or different, and a plurality thereof may be bonded to the ring. Moreover, the monomer which has a norbornene structure may be used individually by 1 type, and may be used combining two or more types by arbitrary ratios.

  Examples of the polar group include a hetero atom or an atomic group having a hetero atom. Examples of the hetero atom include an oxygen atom, a nitrogen atom, a sulfur atom, a silicon atom, and a halogen atom. Specific examples of the polar group include a carboxyl group, a carbonyloxycarbonyl group, an epoxy group, a hydroxyl group, an oxy group, an ester group, a silanol group, a silyl group, an amino group, a nitrile group, and a sulfonic acid group.

  Other monomers capable of ring-opening copolymerization with a monomer having a norbornene structure include, for example, monocyclic olefins such as cyclohexene, cycloheptene, and cyclooctene and derivatives thereof; cyclic conjugated dienes such as cyclohexadiene and cycloheptadiene And derivatives thereof; and the like. As the other monomer capable of ring-opening copolymerization with a monomer having a norbornene structure, one type may be used alone, or two or more types may be used in combination at any ratio.

  A ring-opening polymer of a monomer having a norbornene structure, and a ring-opening copolymer with another monomer copolymerizable with the monomer having a norbornene structure, for example, a known ring-opening polymerization of the monomer You may manufacture by superposing | polymerizing or copolymerizing in presence of a catalyst.

  Examples of other monomers that can be addition-copolymerized with a monomer having a norbornene structure include α-olefins having 2 to 20 carbon atoms such as ethylene, propylene, and 1-butene, and derivatives thereof; cyclobutene, cyclopentene, And cycloolefins such as cyclohexene and derivatives thereof; non-conjugated dienes such as 1,4-hexadiene, 4-methyl-1,4-hexadiene, 5-methyl-1,4-hexadiene; and the like. Among these, α-olefin is preferable and ethylene is more preferable. Moreover, the other monomer which can carry out addition copolymerization with the monomer which has a norbornene structure may be used individually by 1 type, and may be used combining two or more types by arbitrary ratios.

  An addition copolymer of a monomer having a norbornene structure and an addition copolymer of another monomer that can be copolymerized with a monomer having a norbornene structure include, for example, a monomer of a known addition polymerization catalyst. You may manufacture by superposing | polymerizing or copolymerizing in presence.

(3) Monocyclic cyclic olefin polymer Examples of the monocyclic cyclic olefin polymer include addition polymers of cyclic olefin monomers having a single ring such as cyclohexene, cycloheptene, and cyclooctene.

(4) Cyclic conjugated diene copolymer Examples of the cyclic conjugated diene polymer include polymers obtained by cyclization reaction of addition polymers of conjugated diene monomers such as 1,3-butadiene, isoprene and chloroprene; And 1,2- or 1,4-addition polymers of cyclic conjugated diene monomers such as pentadiene and cyclohexadiene; and hydrides thereof.

(5) Vinyl alicyclic hydrocarbon polymer Examples of the vinyl alicyclic hydrocarbon polymer include polymers of vinyl alicyclic hydrocarbon monomers such as vinylcyclohexene and vinylcyclohexane and their hydrides; styrene, α -Hydrogenated product obtained by hydrogenating an aromatic ring moiety contained in a polymer obtained by polymerizing vinyl aromatic hydrocarbon monomers such as methylstyrene; vinyl alicyclic hydrocarbon monomer or vinyl aromatic hydrocarbon monomer And a hydride of an aromatic ring of a copolymer such as a random copolymer or a block copolymer with other monomers copolymerizable with these vinyl aromatic hydrocarbon monomers. Examples of the block copolymer include a diblock copolymer, a triblock copolymer or a multi-block copolymer having more than that, a gradient block copolymer, and the like.

As a method for forming the resin film (A), a known method, for example, an extrusion casting method using a T-die or a calendar method, which has a melt mixing facility such as a single-screw extruder, a multi-screw extruder, a Banbury mixer, a kneader, etc. In the present invention, an extrusion casting method using a T die can be preferably used from the viewpoint of handling property and productivity.
The molding temperature in the extrusion casting method using a T die is appropriately adjusted depending on the flow characteristics and film-forming properties of the polymer used, but is generally 80 ° C. or higher, preferably 100 ° C. or higher, more preferably 120 ° C. or higher. Preferably, the temperature is 140 ° C. or higher, and is generally 320 ° C. or lower, preferably 300 ° C. or lower, more preferably 280 ° C. or lower, more preferably 260 ° C. or lower. When a silane coupling agent or the like is added, the reaction is accompanied. In order to suppress an increase in resin pressure and an increase in fish eye, it is preferable to lower the molding temperature. Various additives such as silane coupling agents, antioxidants, ultraviolet absorbers, weathering stabilizers, etc. may be supplied in advance to the hopper after dry blending together with an alicyclic structure-containing polymer such as polycarbonate resin, It may be supplied after melt-mixing all the materials of the polymer in advance to produce pellets, or a master batch in which only the additive is concentrated in the resin in advance may be supplied.

<Easily adhesive layer (B)>
The easy adhesion layer (B) has a role of facilitating adhesion of the resin film (A) to other members.

As described above, the polarizing plate is generally configured by bonding a protective film on both sides of the polarizer using a water-soluble adhesive such as polyvinyl alcohol. Therefore, when using a resin film (A) as this protective film, as an easily bonding layer (B), the adhesiveness of such a water-soluble adhesive is improved, and adhesiveness with a resin film (A) The thing which can ensure is preferable.
Therefore, for example, when the resin film (A) is a single-layer film composed of an acrylic resin layer or an alicyclic structure resin layer as described above, or an acrylic resin layer or an alicyclic structure resin layer as the outermost surface layer. Assuming that the resin film (A) is bonded to a polarizer using a water-soluble adhesive, the easy-adhesion layer (B) is an acrylic resin layer. In addition to the resin layer and the alicyclic structure resin layer, those having good affinity with the water-soluble adhesive and capable of exhibiting high adhesion are preferable.

  From this point of view, the resin composition constituting the easy-adhesion layer (B) is preferably a resin composition that can be adhered to a PVA film using a water-soluble adhesive, and among them, a urethane group, an amide group, and the like. A resin composition mainly containing a polymer having an NCO group is preferred, and a resin composition mainly containing a urethane resin is particularly preferred.

  Examples of the urethane resin include (1) a component containing two or more active hydrogens in one molecule on average (hereinafter sometimes referred to as “component (1)”) and (2) a polyvalent isocyanate component ( (Hereinafter sometimes referred to as “component (2)”), or a urethane resin obtained by reacting with the above; or the above components (1) and (2) are inert to the reaction under conditions of excess isocyanate groups In an organic solvent having a high affinity with water, an urethanization reaction is carried out to obtain an isocyanate group-containing prepolymer, and then the prepolymer is neutralized, chain-extended using a chain extender, and water is added to the dispersion. And the like. These urethane resins may contain an acid structure (acid residue).

  As the chain extension method of the isocyanate group-containing prepolymer, a known method can be adopted. For example, water, a water-soluble polyamine, glycols or the like is used as the chain extender, and the isocyanate group-containing prepolymer and the chain extender are used. May be reacted in the presence of a catalyst, if necessary.

  The component (1) is not particularly limited, and among them, a compound having a hydroxyl active hydrogen is preferable. Specific examples of such compounds include those exemplified in the following (1-1) to (1-5).

(1-1) Polyol compound As the polyol compound, for example, ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, 2,3-butylene glycol, 1,4- Butylene glycol, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol, 2,5-hexanediol, 1,8-octanediol, dipropylene glycol, 2,2,4-trimethyl-1,3 -Pentanediol, tricyclodecane dimethanol, 1,4-cyclohexanedimethanol, 2,2-dimethylpropanediol and the like.

(1-2) Polyether polyol As the polyether polyol, for example, an alkylene oxide adduct of the polyol compound of (1-1) above; a ring-opening (co) polymer of an alkylene oxide and a cyclic ether (for example, tetrahydrofuran); And polyethylene glycol, polypropylene glycol, ethylene glycol-propylene glycol copolymer; glycols such as glycol, polytetramethylene glycol, polyhexamethylene glycol, polyoctamethylene glycol; and the like.

(1-3) Polyester polyol As the polyester polyol, for example, dicarboxylic acid such as adipic acid, succinic acid, sebacic acid, glutaric acid, maleic acid, fumaric acid, phthalic acid or the anhydride thereof and the above (1-1) It can be obtained by polycondensing the above-mentioned polyol compounds such as ethylene glycol, propylene glycol, 1,4-butylene glycol, 1,6-hexanediol, 1,8-octanediol, neopentyl glycol and the like under the condition of excess hydroxyl group. Can be mentioned. More specifically, for example, ethylene glycol-adipic acid condensate, butanediol-adipine condensate, hexamethylene glycol-adipic acid condensate, ethylene glycol-propylene glycol-adipic acid condensate, or lactone with glycol as an initiator. And polylactone diol obtained by ring-opening polymerization.

(1-4) Polyether ester polyol As the polyether ester polyol, for example, an ether group-containing polyol (for example, the polyether polyol or diethylene glycol of the above (1-2)) or a mixture of this with other glycols is used. Examples include those obtained by reacting an alkylene oxide in addition to the dicarboxylic acid or anhydride thereof exemplified in (1-3). More specifically, examples include polytetramethylene glycol-adipic acid condensate.

(1-5) Polycarbonate polyol As a polycarbonate carbonate polyol, for example, general formula HO-R- (OC (O) -O-R) n-OH (wherein R is a carbon number of 1 or more and 12 or less. In addition, n represents the number of repeating units of a molecule, and is usually an integer of 5 or more and 50 or less. These are a transesterification method in which a saturated aliphatic polyol and a substituted carbonate (for example, diethyl carbonate, diphenyl carbonate, etc.) are reacted under the condition that the hydroxyl group is excessive; the saturated aliphatic polyol and phosgene are reacted, or If necessary, it can be obtained by a method of further reacting a saturated aliphatic polyol thereafter.

  The compounds as exemplified in the above (1-1) to (1-5) may be used alone or in combination of two or more at any ratio.

  Examples of the component (2) to be reacted with the component (1) include an aliphatic, alicyclic or aromatic compound containing an average of two or more isocyanate groups in one molecule.

  The aliphatic diisocyanate compound is preferably an aliphatic diisocyanate having 1 to 12 carbon atoms, and examples thereof include hexamethylene diisocyanate, 2,2,4-trimethylhexane diisocyanate, and hexane diisocyanate (HDI). The alicyclic diisocyanate compound is preferably an alicyclic diisocyanate compound having 4 to 18 carbon atoms, such as 1,4-cyclohexane diisocyanate, methylcyclohexylene diisocyanate, isophorone diisocyanate (IPDI), dicyclohexylmethane diisocyanate (HMDI), and the like. Can be mentioned. Examples of the aromatic diisocyanate compound include tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, xylylene diisocyanate, and the like. One of these may be used alone, or two or more of these may be used in combination at any ratio.

  As the urethane resin constituting the main component resin of the easy-adhesion layer (B), it is excellent in heat resistance and water resistance and can form an easy-adhesion layer having the optimum storage elastic modulus in the present invention. One having a skeleton, specifically, a urethane-based resin obtained by a reaction of the polycarbonate polyol (1-5) with an aliphatic diisocyanate compound and / or an alicyclic diisocyanate compound is preferable.

  The urethane-based resin preferably has an acid structure. Urethane resin having an acid structure can be dispersed in water without using a surfactant or even with a small amount of surfactant, so that the water resistance of the easy-adhesion layer is improved. There is expected. This is called a self-emulsifying type, which means that the urethane-based resin can be dispersed and stabilized in water only by molecular ionicity without using a surfactant. The easy-adhesion layer (B) using such a urethane resin is preferable because it has excellent adhesion to the release film (C) and can maintain high transparency. Further, it is preferable to perform crosslinking using this acid structure as a starting point, since the hydrophobicity, heat resistance, and wet heat properties can be further improved.

  Examples of the acid structure include acid groups such as a carboxyl group (—COOH) and a sulfonic acid group (—SO 3 H). Moreover, the acid structure may exist in the side chain of a urethane-type resin, and may exist in the terminal. In addition, 1 type may be used for an acid structure and it may use it combining 2 or more types by arbitrary ratios.

  The content of the acid structure is preferably 5 mgKOH / g or more, more preferably 10 mgKOH / g or more, preferably 250 mgKOH / g or less, more preferably 150 mgKOH / g or less as the acid value of the urethane resin. If the acid value is less than 5 mgKOH / g, the water dispersibility tends to be insufficient. On the other hand, if the acid value is more than 250 mgKOH / g, the water resistance of the easy adhesion layer tends to be poor.

  As a method for introducing an acid structure into a urethane resin, a conventionally used method can be used without any particular limitation. Preferred examples include polyether polyol, polyester polyol, polyether ester in advance by replacing dimethylol alkanoic acid with part or all of the glycol component described in (1-2) to (1-4) above. The method of introduce | transducing a carboxyl group into a polyol etc. can be mentioned. Examples of the dimethylol alkanoic acid that can be used here include dimethylol acetic acid, dimethylol propionic acid, and dimethylol butyric acid. In addition, dimethylol alkanoic acid may be used individually by 1 type, and may be used combining two or more types by arbitrary ratios.

  The number average molecular weight of the urethane-based resin is preferably 1,000 or more, more preferably 20,000 or more, preferably 1,000,000 or less, and more preferably 200,000 or less.

A commercially available urethane resin may be used.
Examples of commercially available urethane resins that can be used for coating as an easy-adhesion layer include, for example, “Adekabon titer” series manufactured by Asahi Denka Kogyo, “Olestar” series manufactured by Mitsui Toatsu Chemicals, Dainippon Ink “Bondic” series, “Hydran” series manufactured by Kagaku Kogyo Co., Ltd., “Imperil” series manufactured by Bayer, “Sofuranate” series manufactured by Sofran Japan, “Poise” series manufactured by Kao Corporation, Sanyo Chemical Industries "Samprene", "Ucote", "Euporin" series, "Rezamin" series manufactured by Dainichi Seika Kogyo Co., Ltd., "Izelux" series manufactured by Hodogaya Chemical Co., Ltd., "Superflex" manufactured by Daiichi Kogyo Seiyaku Co., Ltd. Series, “Neoletz” series manufactured by Zeneca, “Sancure” series by Lubrizol, Stahl Yapan manufactured by "RU" series, and the like can be used. In particular, “Yukot UA-368” manufactured by Sanyo Chemical Industries, “RU-40-350” and “EX-RU-92-605” manufactured by Stahl Japan Co., Ltd., “Rezamin D” manufactured by Dainichi Seika Kogyo Co., Ltd. "-6031" and the like have an aliphatic polycarbonate skeleton and are dispersed in water with a volatile base.

When urethane resin is used as the main component resin of the easy-adhesion layer (B), the easy-adhesion layer (B) is crosslinked as necessary for the purpose of improving moisture resistance, heat resistance, and mechanical strength. An agent may be contained.
Generally as a crosslinking agent, a carbodiimide resin, an epoxy resin, an oxazoline resin, a melamine resin, an isocyanate resin etc. can be used conveniently.
The content of the crosslinking agent is 0.1 parts by weight or more with respect to 100 parts by weight of the urethane-based resin. The moisture resistance and heat resistance of the urethane coat layer formed by sufficiently crosslinking the urethane-based resin, machine From the viewpoint of sufficiently increasing the mechanical strength. On the other hand, from the viewpoint of increasing the moisture resistance, heat resistance and mechanical strength of the easy-adhesive layer (B) by reducing the residual unreacted crosslinking agent, the crosslinking agent is 40 parts by weight with respect to 100 parts by weight of the urethane resin. It is preferable that it is less than. In particular, it is preferably 1 part by weight or more and 30 parts by weight or less with respect to 100 parts by weight of the urethane resin.

  In addition, when urethane resin is used as the main component resin of the easy-adhesion layer (B), viscosity adjustment, drying speed, drying in the molding process of the easy-adhesion layer is within the range that does not impair the stability and performance of the urethane resin. For the purpose of adjusting the temperature, various solvents are preferably added alone or in combination. As a solvent in the urethane resin that can be used in the above-described coating or the like, in addition to ion-exchanged water and distilled water, alcohols and various organic solvents can be used. Among these, alcohols such as methanol, ethanol, and isopropanol have high volatility, can reduce drying temperature and drying time, and are excellent in affinity with a urethane resin for coating, and therefore can be suitably used.

The thickness of the easy adhesion layer (B) is preferably 0.3 μm or more and 2.5 μm or less. If it is 0.3 μm or more, it is preferable because its adhesiveness can be improved when it is bonded to a PVA film using a water-soluble adhesive. On the other hand, if it is 2.5 μm or less, the tack on the easy adhesive layer side is preferred. The increase in property can be suppressed, and the delamination strength F2 with the release film (C) can be 1.0 or less, which is preferable.
From this point of view, the thickness of the easy-adhesion layer (B) is preferably 0.3 μm or more and 2.5 μm or less, more preferably 0.5 μm or more or 2.0 μm or less, and particularly preferably 0.7 μm. More preferably, it is 1.5 μm or less.
As a method for adjusting the thickness of these easy-adhesion layers (B), when the coating method described above is used, the solid content of the resin composition forming the easy-adhesion layer (B) is adjusted, or the coating amount is adjusted. It is possible to do so. However, it is not limited to these methods.

The easily adhesive layer (B) preferably has a storage elastic modulus G ′ (MPa) at 23 ° C. of 0.1 or more and 100 or less, more preferably 0.5 MPa or more or 90 MPa or less, and more preferably 1 MPa or more or More preferably, it is 80 MPa or less.
By setting the storage elastic modulus at 23 ° C. of the easy-adhesive layer (B) to 0.1 MPa or more, an increase in tackiness on the easy-adhesive layer side is suppressed, and the release film (C) and the easy-adhesive layer (B) Can be suppressed to 1.0 or less. On the other hand, by setting the pressure to 100 MPa or less, the adhesiveness can be improved when the PVA film is bonded using a water-soluble adhesive.
The storage elastic modulus of the easy adhesion layer (B) can be adjusted by changing the type and composition of the resin constituting the easy adhesion layer to be used. However, it is not limited to these methods.

<Release film (C)>
The release film (C) is preferably one that can be easily peeled off from the resin film (A) while improving the handleability by being laminated on the resin film (A). Especially, what can be used as a protective film (what is called a masking film) of a polarizer protective film is preferable, for example.

  The release film (C) is a multilayer film having a base material layer C1 and an adhesive layer C2. Specifically, the adhesive layer C2 is provided on one surface of the base material layer C1. Since the release film (C) has the adhesive layer C2, the delamination strength F1 between the resin film (A) and the release film (C) can be 0.01 or more and can be peeled off. Can be pasted together.

The base layer C1 of the release film (C) is such that the base layer C1 and the easy-adhesion layer (B) that are in contact with each other in the film winding layer body are in contact with each other. In this case, the correlation peel strength F2 between the release film (C) and the easy-adhesion layer (B) is larger than the F1, but it is important to select so that F2 is 1.0 or less.
For example, examples of the base material layer C1 include polyolefins such as polyethylene, polypropylene, and polyvinyl chloride, polyesters such as PET and PEN, polycarbonate (PC), and polyimide. Especially, the film using polyolefin resin, such as polyethylene and a polypropylene, from a chemical affinity with the adhesion layer C2 and a viewpoint of productivity of a release film is preferable. However, it is not limited to these.
From the viewpoint of chemical affinity with the adhesive layer C2 and the productivity of the release film, a film using a polyolefin resin such as polyethylene or polypropylene is particularly preferable.

The thickness of the base material layer C1 is preferably 3 μm or more and 100 μm or less. If it is 3 μm or more, it is preferable because the handleability is good. On the other hand, if it is 100 μm or less, it is preferable because the economy and the volume and weight of the wound layer can be reduced.
From this point of view, the thickness of the base material layer C1 is preferably 3 μm or more and 100 μm or less, more preferably 5 μm or more or 80 μm or less, and particularly preferably 10 μm or more or 60 μm or less.

  On the other hand, the adhesive layer C2 of the release film (C) can be bonded to the resin film (A) in a peelable manner because the adhesive layer C2 and the resin film (A) that are in contact with each other in the film winding layer body are in contact with each other. It is important to be able to do it. Examples of the adhesive layer C2 include rubber adhesives, acrylic adhesives, polyvinyl ether adhesives, urethane adhesives, and silicone adhesives. More specifically, for example, those using acrylic resin, urethane resin, ethylene / vinyl acetate copolymer resin, polyolefin resin and the like can be exemplified. However, it is not limited to these.

The thickness of the adhesive layer C2 is preferably 0.1 μm or more and 20 μm or less. If it is 0.1 μm or more, the adhesiveness with the base material layer C1 becomes good, and the other is preferably 20 μm or less because there is little adhesive residue and the peeling performance from the resin film (A) can be secured.
From this viewpoint, the thickness of the adhesive layer C2 is preferably 0.1 μm or more and 20 μm or less, more preferably 0.3 μm or more or 15 μm or less, and particularly preferably 0.5 μm or more or 10 μm or less. Is more preferable.

  As the release film (C), for example, an adhesive-coated release film formed by applying an adhesive to the base material layer C1, or a co-extrusion of the base material layer C1 and the adhesive layer C2 is formed. A self-adhesive mold release film may be mentioned. As will be described later, in the present invention, the self-adhesive film in which the adhesive layer is a polyolefin resin layer is preferable.

  The pressure-sensitive adhesive in the pressure-sensitive adhesive-coated release film is not particularly limited as long as it can suppress the occurrence of resin chipping and curling at the time of slitting. For example, an acrylic resin adhesive, an epoxy resin adhesive, a silicone rubber adhesive, and the like can be given. However, it is not limited to these.

The adhesive resin in the self-adhesive mold release film is not particularly limited as long as it can suppress the occurrence of resin chipping and curling at the time of slitting, but the self-adhesive mold release film in which the adhesive layer C2 is a polyolefin resin layer. Preferably there is.
In the case of a self-adhesive mold release film in which the adhesive layer C2 is a polyolefin resin layer, product contamination due to outgas components, adhesive residue when peeling the mold release film from the film laminate of the present invention, and a high temperature of 100 ° C. or higher There is less concern that problems such as breakage of a release film or a protective film due to fluctuations in peeling force caused by component transfer at the time may occur.

  The manufacturing method of a release film (C) is not specifically limited. For example, a coextrusion method in which the base material layer C1 and the adhesive layer C2 are laminated by coextrusion, a cast coating method in which the adhesive layer C2 is applied in-line after forming the base material layer C1, and the base material layer C1 and the adhesive layer C2 And the like, and then heat-sealing and laminating by heat fusion. Among these, the co-extrusion method is particularly suitable from the viewpoint that there is less concern about product contamination due to volatilization of the residual solvent and that the thickness accuracy is increased.

  The correlation peel strength between the base material layer C1 and the adhesive layer C2 is not particularly limited, but when the release film (C) is peeled from the resin film layer (A), the components of the adhesive layer C2 remain on the resin film. It is important that the release films are peeled together so that there is no.

  Moreover, a release film (C) may have another layer between the base material layer C1 and the adhesion layer C2. In this case as well, when the release film (C) is peeled from the resin film layer (A), it is important that the release film is peeled together so that the components of the adhesive layer C2 do not remain on the resin film. is there.

The thickness of the release film (C) is preferably 5 μm or more and 100 μm or less. If the thickness of the release film (C) is 5 μm or more, it is preferable because the handling properties are good, and if it is 100 μm or less, the economy and the volume and weight of the wound layer body can be reduced.
From such a viewpoint, the thickness of the release film (C) is preferably 5 μm or more and 100 μm or less, more preferably 10 μm or more or 80 μm or less, and particularly preferably 15 μm or more or 60 μm or less. .

<This laminated film>
The laminated film includes a resin film (A) including at least one layer containing an acrylic polymer, an alicyclic structure-containing polymer, or a mixture of these polymers as a main component resin, and one side of the resin film (A). It is a laminated film provided with the easy-adhesion layer (B) laminated | stacked by this, and the release film (C) laminated | stacked on the other surface side of the resin film (A) so that peeling is possible.

(1) Thickness The thickness of the laminated film is not particularly limited, but is preferably 150 μm or less, more preferably 100 μm or less, and particularly preferably 80 μm or less, from the viewpoint of the demand for thinning the optical film in general. On the other hand, from the viewpoint of handling properties and strength, 5 μm or more is preferable, and 10 μm or more is more preferable.

(2) Lamination ratio In this laminated film, the ratio of the thickness of the release film (C) to the total thickness of the laminated film (lamination ratio) is 30% or more, more preferably 40% or more, and even more preferably 55% or more. .
Here, if the thickness ratio of the release film (C) is 30% or more, the mechanical strength of the laminated film is good and the handling property is excellent, which is preferable. The upper limit of the thickness of the release film (C) is not particularly defined, but is 95% or less, more preferably 90% or less, and still more preferably 85% or less from the viewpoint of reducing the weight of the release film to be used. .

Hereinafter, although the manufacturing method of the laminated film which consists of a layer structure of an easily bonding layer (B) / resin film (A) / release film (C) is demonstrated, it does not specifically limit.
After bonding the release film (C) to the resin film (A), a production process for forming the easy-adhesion layer (B) can be suitably used from the viewpoint of handling properties and productivity.
Hereinafter, the method of bonding a release film (C) and the method of forming an easily bonding layer (B) are demonstrated, respectively.

  The method of bonding the resin film (A) and the release film (C) is not particularly limited, and the films may be stacked and bonded by a roll or the like. At this time, the roll used for bonding is preferably a combination of a rubber roll and a rubber roll or a combination of a rubber roll and a metal roll. Examples of the rubber type of the rubber roll include silicone rubber, butyl rubber, EPDM rubber, and nitrile rubber. Of these, silicone rubber is preferred from the viewpoint of durability. The rubber roll having a rubber hardness of usually 20 degrees or more and 90 degrees or less can be used. However, it is not particularly limited.

  As the molding process of the easy-adhesion layer (B), from the viewpoint of productivity, thickness accuracy, etc., a solution coating method in which the resin composition is formed by drying the solvent after applying the resin composition for forming the easy-adhesion layer (B) Are preferably used. Specific solution coating methods include, for example, wire bar coating, dipping, spraying, spin coating, roll coating, gravure coating, air knife coating, curtain coating, slide coating, and extrusion coating. Law.

  The drying temperature during molding of the easy-adhesive layer (B) depends on the type of solvent contained in the resin composition to be used, but in general, the easy-adhesive layer can be dried at 45 ° C. or higher. And 50 ° C. or higher is more preferable. On the other hand, when the release film (C) in which the pressure-sensitive adhesive layer C2 is a polyolefin resin layer is bonded in advance to the resin film (A), the drying temperature at the time of molding the easy-adhesion layer (B) is The temperature is preferably less than 110 ° C., and more preferably less than 90 ° C., since the performance of the delamination strength of the adhesive layer can be exhibited more. By setting it to less than 110 ° C., it is possible to suppress the delamination strength F1 between the resin film (A) and the release film (C) so as not to be too high.

<Method for producing wound layer body>
Although it does not restrict | limit especially as a method of manufacturing the wound layer body of this invention, A well-known method can be applied and it can manufacture by carrying out the overlapping winding of said laminated body.

<Application>
This film wound layer is obtained by laminating the laminated film obtained by rewinding the wound layer and processing it to a predetermined size to the polarizer via the easy-adhesive layer (B), and then releasing the release film (C). If peeled off, the resin film (A) can be bonded to the polarizer as a protective film.
As mentioned above, it can be used as a polarizing plate that can be used in a liquid crystal display device or the like by bonding the resin film (A) to the front and back sides of the polarizer via the easy adhesion layer (B). it can.

When the resin film (A) is bonded to the polarizer via the easy adhesion layer (B), the easy adhesion layer (B) and the polarizer are preferably bonded via a water-soluble adhesive such as polyvinyl alcohol. .
Therefore, a laminate having a configuration in which an adhesive layer mainly composed of a water-soluble adhesive such as polyvinyl alcohol is laminated on the outside of the easy-adhesion layer (B) of the laminate film constituting the film winding layer. And the laminate may be bonded to a polarizer.

<Explanation of words>
“Sheet” generally refers to a product that is thin by definition in JIS and generally has a thickness that is small and flat for the length and width. In general, “film” is compared to the length and width. A thin flat product having an extremely small thickness and an arbitrarily limited maximum thickness, usually supplied in the form of a roll (Japanese Industrial Standard JISK6900). For example, in terms of thickness, in the narrow sense, a film having a thickness of 100 μm or more is sometimes referred to as a sheet, and a film having a thickness of less than 100 μm is sometimes referred to as a film. However, the boundary between the sheet and the film is not clear, and it is not necessary to distinguish the two in terms of the present invention. Therefore, in the present invention, even when the term “sheet” is used, the term “film” is included, and the term “film” is used. Even in this case, “sheet” is included.

  In this specification, the expression “more than X” (X is an arbitrary number) or “Y or less” (Y is an arbitrary number) is preferably “greater than X” or “less than Y”. Is also included.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited by these examples and comparative examples.

[Evaluation method]
In the following, measurement and evaluation of various physical properties and the like were performed as follows.

(Delamination strength between resin film and release film F1)
After the laminated films prepared in Examples and Comparative Examples were cut to a width of 20 mm, a test speed of 50 mm / min was used between the resin film and the release film using a universal tensile tester (manufactured by Intesco, model: 200X). Was subjected to T-type peeling, and the delamination strength (F1) (N / 20 mm width) at that time was measured and listed in Table 1.

(Delamination strength between easy-adhesive layer and release film F2)
A film sample in a state where an easy-adhesion layer of a laminated film and a release film are laminated from the wound layer bodies produced in Examples and Comparative Examples, and after the film sample is cut into a width of 20 mm, a universal tensile tester T-type peeling was carried out at a test speed of 50 mm / min using Intesco (model: 200X), and the delamination strength (F2) (N / 20 mm width) at that time was measured and listed in Table 1.

(Peel strength between easy-adhesive film and adhesive)
To 100 g of an aqueous solution of 10% by weight of PVA resin (Nippon Gosei Co., Ltd., Gohsenx Z-200), 0.3 parts by weight of a crosslinking agent (Nihon Gosei Co., Ltd., SPM-02) is mixed to obtain an adhesive. Produced.
With the coated layer of the produced laminated film as the adhesive side, the adhesive was applied with a # 24 bar coater, and a biaxially stretched PVA film (Nihon Gosei Co., Ltd., trade name: Boblon, thickness: 40 μm) was bonded. The sample for evaluation was produced by heating and drying at 100 ° C. for 300 seconds.
After this sample was cut at a width of 20 mm, T-type peeling was performed at a test speed of 50 mm / min using a universal tensile tester (manufactured by Intesco, model: 200X), and the delamination strength at that time (N / 20 mm width) ) Was measured and listed in Table 1.

(Resin modulus)
The coating liquid described in the examples and comparative examples was applied to a Teflon (registered trademark) sheet and dried at 100 ° C. for 60 seconds to prepare an evaluation sample.
This sample was measured by a tensile method using a dynamic viscoelasticity measuring device “DVE-V4” (manufactured by Rheology) at a frequency of 10 Hz and a heating rate of 3 ° C./min, and the storage elastic modulus at 25 ° C. was measured. It was described in Table 1 as “elastic modulus of easy-bonding layer”.

<Appearance evaluation>
As the film appearance evaluation at the time of unwinding the wound layer body described in the examples and comparative examples, the following conditions were used for the implementation and determination.

(Releasability of release film)
About the release film peelability, after pulling out the laminated film from the wound layered body, the appearance condition when the laminated film and the release film were peeled was determined according to the following criteria.
○: No creases, cracks, or breakage occurs on the resin film side when the release film is peeled off.
X: Wrinkles, cracks, and damage occur on the resin film side when the release film is peeled off.

(Adhesive layer surface condition)
About the state evaluation of the coat surface, the following reference | standard determined about the surface state by the side of the easily bonding layer at the time of unwinding a laminated | multilayer film from a wound body.
○: No breakage occurred during unwinding, and no abnormality was observed on the surface of the easy-adhesion layer.
X: The resin film is damaged during unwinding. Or whitening, an unevenness | corrugation, and a defect | deletion arise in the surface of the easily bonding layer of a resin film.

[Production of polymer]
The resin composition used for the resin film was produced as follows.

<Acrylic polymer>
As the acrylic polymer, a PMMA resin manufactured by Sumitomo Chemical Co., Ltd., 79 parts by weight of “SUMIPEX MGSS” and 21 parts by weight of an acrylic resin “Clarity LA4285” manufactured by Kuraray Co., Ltd. were used. The glass transition temperature (JIS K7122, heating rate 10 ° C./min) of the acrylic polymer was 110 ° C., and the MFR (230 ° C., 3.8 kg load) was 16.0 g / 10 min.

<Alicyclic structure-containing polymer>
A structural unit derived from isosorbide which is a dihydroxy compound and a structural unit derived from tricyclodecane dimethanol, and the molar ratio of these structural units is isosorbide / tricyclodecane dimethanol = 6/4, An alicyclic structure-containing polymer (polycarbonate resin) having a glass transition temperature of 126 ° C. was prepared.

[Example 1]
A laminated film and a wound layered body were produced as follows.

  The acrylic polymer and the alicyclic structure-containing polymer (polycarbonate resin) were each put into a φ65 mm single screw extruder, melt-kneaded at a barrel setting temperature of 220 ° C. or higher and 240 ° C. or lower, a width of 1350 mm and a lip gap of 0. After co-extrusion from a 7 mm die (set temperature: 240 ° C.) into three layers of acrylic polymer / alicyclic structure-containing polymer / acrylic polymer, cast with a cast roll adjusted to 65 ° C. Next, as the release film (C), the adhesive layer side of a 30 μm-thick polypropylene self-adhesive film (“Taiko FSA-020M” (Futamura Chemical Co., Ltd.)) is bonded to the three-layer film to obtain a thickness. A laminated film in which the release film (C) was peelably laminated on one side of a 15 μm resin film (A) was produced.

(Preparation of coating solution)
The coating liquid used for the easy-adhesion layer (B) is an aqueous urethane emulsion (acid structure: carboxylic acid, base: triethylamine) “Resamine D-6031” (manufactured by Dainichi Seika Kogyo Co., Ltd., solid content: about 30 wt% as a urethane resin. 10000 g of urethane emulsion (A)), 500 g of methylol / imino group type melamine formaldehyde resin “Cymel 701” (manufactured by Ornex Japan Ltd.) as a crosslinking agent, and 5000 g of isopropanol and methanol. A coating solution was prepared by diluting with a mixed solution of 5000 g.

(Production of laminated film and wound layer)
The corona treatment was performed on the resin film (A) side of the produced laminated film, that is, the surface opposite to the release film (C), using a corona treatment device with an integrated irradiation amount of 1000 W / m ^2. The treatment surface is coated with the coating solution using a gravure roll so that the thickness of the easy-adhesion layer (B) after drying is 1.2 μm, and the temperature condition is 60 ° C. in a drying furnace having a 4 m floating zone. Was dried under the conditions of a line speed of 4 m / min to produce a laminated film having an easy-adhesion layer (B) having a thickness of 1.2 μm.
Then, the laminated film was wound up with a tension of 100 N using an ABS resin core having an inner diameter of 3 inches to produce a wound layer body.

[Example 2]
In Example 1, a laminated film and a wound layer body were produced in the same manner as in Example 1 except that the thickness of the easy-adhesion layer (B) was 2.2 μm.

[Example 3]
In Example 1, as a release film (C), a PP / PE laminated film “Tretec 7H52” (manufactured by Toray Film Processing Co., Ltd., 30 μm product), which is a laminated film of a polypropylene layer and a polyethylene layer, and A laminated film and a wound layer were produced in the same manner as in Example 1 except that the drying temperature after coating when forming the easy-adhesion layer (B) was 100 ° C.

[Example 4]
In Example 3, 9000 g of the urethane emulsion (A) as a coating liquid used for the easy-adhesion layer (B) and an aqueous urethane emulsion (acid structure: carboxylic acid, base: triethylamine) “Resamine D-6300” (Daiichi Seika) Manufactured by Kogyo Co., Ltd., solid content: about 30 wt%, hereinafter referred to as urethane emulsion (B) may be abbreviated as 1000 g), a laminated film and a wound layer body are produced in the same manner as in Example 3. did.

[Example 5]
In Example 1, except that the release film (C) was a PP / PE laminated film “Tretec 6030M” (manufactured by Toray Film Processing Co., Ltd., 30 μm product) which is a laminated film of a polypropylene layer and a polyethylene layer. A laminated film and a wound layered body were produced in the same manner as in Example 3.

[Example 6]
In Example 1, the acrylic polymer was put into a φ65 mm single screw extruder, melt kneaded at a barrel set temperature of 220 ° C. or higher and 240 ° C. or lower, and a die having a width of 1350 mm and a lip gap of 0.7 mm (set temperature of 240 ° C. ), A laminated film and a wound layer were produced in the same manner as in Example 1 except that the film was extruded so as to be a single layer of an acrylic polymer.

[Example 7]
In Example 1, the alicyclic structure-containing polymer (polycarbonate resin) was charged into a φ65 mm single-screw extruder, melt-kneaded at a barrel setting temperature of 220 ° C. or higher and 240 ° C. or lower, a width of 1350 mm and a lip gap of 0. A laminated film and a wound layer body were produced in the same manner as in Example 1 except that a 7-mm base (set temperature: 240 ° C.) was extruded to form a single layer of an alicyclic structure-containing polymer (polycarbonate resin).

[Comparative Example 1]
In Example 4, as the release film (C), the laminated self-adhesive film “Taiko FSA-020M” (manufactured by Phutamura Chemical Co., Ltd., 30 μm product) was used in the same manner as in Example 4 except that a laminated film and a wound film were used. A layered body was produced.

[Comparative Example 2]
In Example 1, a laminated film and a wound layer were produced in the same manner as in Example 1 except that the thickness of the easy-adhesion layer (B) was 0.1 μm.

[Comparative Example 3]
In Example 3, a laminated film and a wound layer were produced in the same manner as in Example 3 except that 5000 g of urethane emulsion (A) was used as the urethane resin of the coating liquid and a mixed liquid of 5000 g of urethane emulsion (B). .

[Comparative Example 4]
In Example 3, a laminated film and a wound layer body were produced in the same manner as in Example 1 except that the thickness of the easy-adhesion layer (B) was 2.8 μm.

  Table 1 shows the evaluation results of the wound layer bodies in Examples 1 to 7 and Comparative Examples 1 to 4.

As shown in Table 1, it was confirmed that all of the wound layers of Examples 1 to 7 had good release properties of the release film (C) and no wrinkles or tears occurred. In addition, the easy-adhesion layer (the surface of B was free from abnormalities such as whitening and chipping, and good results were obtained. Further, all of them exhibited very excellent properties in adhesion to a water-soluble adhesive.
On the other hand, all of the wound layers of Comparative Examples 1 to 4 were inferior in any of the above characteristics.

Claims (13)

A resin film (A) containing at least one layer containing an acrylic polymer, an alicyclic structure-containing polymer or a mixture of these polymers as a main component resin, and laminated on one side of the resin film (A). Film winding in which a laminated film comprising an easy-adhesive layer (B) and a release film (C) laminated on the other surface of the resin film (A) in a peelable manner is wound in a roll shape A layered body,
The release film (C) has a base material layer (C1) and an adhesive layer (C2),
Delamination strength F1 (N / 20 mm width) between the resin film (A) and the release film (C) and delamination strength F2 (N / 20 mm width) between the release film (C) and the easy adhesion layer (B) F1 and F2 are both 0.01 or more and 1.0 or less, and F2 is larger than F1.   The film winding layer according to claim 1, wherein the delamination strength F1 (N / 20 mm width) between the resin film (A) and the release film (C) is 0.01 or more and 0.1 or less. body.   The film wound layer according to claim 1 or 2, wherein the easily adhesive layer (B) has a storage elastic modulus G '(MPa) at 23C of 0.1 or more and 100 or less.   The film winding layer according to any one of claims 1 to 3, wherein the winding tension is 10 N / m width or more and 200 N / m width or less.   The film winding layer according to any one of claims 1 to 4, wherein the resin film (A) is a film having a layer containing an acrylic polymer as a main component resin as an outermost surface layer. body.   The resin film (A) includes a layer containing an alicyclic structure-containing polymer as a main component resin as an intermediate layer, and a three-layer film including layers containing an acrylic polymer as a main component resin on both sides The film winding layered product according to any one of claims 1 to 4 characterized by things.   The film roll layered product according to any one of claims 1 to 4, wherein the resin film (A) is a single layer film composed of a layer containing an acrylic polymer as a main component resin.   The thickness of the said resin film (A) is 3 micrometers or more and 80 micrometers or less, The film winding layered body as described in any one of Claims 1-7 characterized by the above-mentioned.   The thickness of the said easily bonding layer (B) is 0.5 micrometer or more and 2.5 micrometers or less, The film winding layered body as described in any one of Claims 1-9 characterized by the above-mentioned.   The said easily bonding layer (B) uses urethane type resin as a main component resin, The film winding layered body as described in any one of Claims 1-9 characterized by the above-mentioned.   The laminated body provided with the structure by which an adhesive bond layer is laminated | stacked on the outer side of the easily bonding layer (B) of the laminated film which comprises the film winding layered body as described in any one of Claims 1-10.   The laminate according to claim 11, wherein the adhesive layer contains a water-soluble adhesive as a main component. A liquid crystal display device comprising the laminate according to claim 11.