JP2020157632A - Laminated sheet roll body - Google Patents

Abstract

To provide a laminated sheet roll body capable of suppressing the occurrence of a dent in a light diffusion control film.SOLUTION: A laminated sheet roll body is formed by winding a laminated sheet including: a first film; a light diffusion control film laminated on one surface of the first film and having an internal structure including a plurality of regions having a relatively high refractive index in a region having a relatively low refractive index in the film; and a second film laminated on the surface side opposite to the first film in the light diffusion control film. The thickness of at least one of the first film and the second film is 45 μm.SELECTED DRAWING: Figure 1

Description

The present invention relates to a roll body of a laminated sheet provided with a light diffusion control film capable of diffusing or transmitting incident light depending on an incident angle.

In the field of optical technology to which liquid crystal display devices, organic light emitting devices, and the like belong, the use of a light diffusion control film capable of strongly diffusing incident light from a specific angle range in a specific direction is being studied.

As an example of such a light diffusion control film, there is a film having an internal structure having a plurality of regions having a relatively high refractive index in a region having a relatively low refractive index. More specifically, a light diffusion control film having a louver structure in which a plurality of plate-shaped regions having different refractive indexes are alternately arranged along an arbitrary direction along a film surface, or a light diffusion control film having a relatively different refractive index. There is a light diffusion control film or the like having a column structure in which a plurality of columnar objects having a relatively high refractive index are planted in a low region.

As the light diffusion control film as described above, Patent Document 1 contains a predetermined urethane (meth) acrylate compound, a predetermined (meth) acrylic acid ester compound having an aromatic skeleton, and a predetermined photopolymerization initiator. A light diffusion control film obtained by curing a resin composition for a light diffusion control film is disclosed.

Patent No. 6414883

By the way, the light diffusion control film has a problem that dents are likely to occur during manufacturing, transportation, storage and the like. In particular, when the light diffusion control film is wound into a roll and transported, stored, etc., foreign matter is likely to be caught between the light diffusion control films, and as a result, dents are likely to occur. Become. In particular, the roll body may be stored for a long period of time with foreign matter pressed against the light diffusion control film, which may leave strong dents.

The present invention has been made in view of such an actual situation, and an object of the present invention is to provide a rolled body of a laminated sheet capable of suppressing the occurrence of dents in a light diffusion control film.

In order to achieve the above object, firstly, in the present invention, the refractive index is relative to the first film and the region in which the refractive index is relatively low in the film laminated on one side of the first film. A laminated sheet including a light diffusion control film having an internal structure having a plurality of high regions and a second film laminated on a surface side of the light diffusion control film opposite to the first film is wound up. Provided is a roll body of a laminated sheet, wherein at least one of the first film and the second film has a thickness of 45 μm or more (Invention 1).

In the roll body of the laminated sheet according to the above invention (Invention 1), at least one of the first film and the second film laminated on the light diffusion control film has the above-mentioned thickness, so that foreign matter is sandwiched in the roll body. Even when the above occurs, the occurrence of dents on the light diffusion control film can be satisfactorily suppressed.

In the above invention (Invention 1), it is preferable to provide an adhesive layer provided between the light diffusion control film and the second film (Invention 2).

In the above invention (Invention 2), the thickness of the pressure-sensitive adhesive layer is preferably 1 μm or more and 1000 μm or less (Invention 3).

In the above inventions (Inventions 2 and 3), the storage elastic modulus of the pressure-sensitive adhesive layer at 23 ° C. is preferably 0.01 MPa or more and 50 MPa or less (Invention 4).

In the above inventions (Inventions 1 to 4), the thickness of the first film and the second film is preferably 45 μm or more (Invention 5).

In the above inventions (Inventions 1 to 5), it is preferable that at least one of the first film and the second film is a release sheet obtained by peeling the surface on the light diffusion control film side (Invention 6).

In the above inventions (Inventions 1 to 6), the indentation elastic modulus of the light diffusion control film at 23 ° C. is preferably 1 MPa or more and 5000 MPa or less (Invention 7).

In the above inventions (Inventions 1 to 7), the thickness of the light diffusion control film is preferably 20 μm or more and 700 μm or less (Invention 8).

According to the roll body of the laminated sheet according to the present invention, it is possible to provide a light diffusion control film in which the generation of dents is suppressed.

It is sectional drawing of the laminated sheet which comprises the roll body which concerns on one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described.
FIG. 1 shows a cross-sectional view of a laminated sheet constituting a roll body according to an embodiment of the present invention. The laminated sheet 1 shown in FIG. 1 includes a first film 11a, a light diffusion control film 12 laminated on one side of the first film 11a, and a surface side of the light diffusion control film 12 opposite to the first film 11a. A second film 11b laminated on the surface side of the pressure-sensitive adhesive layer 13 opposite to the light diffusion control film 12 is provided. The roll body according to the present embodiment is formed by winding a laminated sheet 1 having such a layer structure. In the roll body according to the present embodiment, the above-mentioned pressure-sensitive adhesive layer 13 is not essential and may be omitted.

1. 1. Components of Roll Body of Laminated Sheet (1) First Film and Second Film In the laminated sheet 1 in the present embodiment, the thickness of at least one of the first film 11a and the second film 11b is 45 μm or more. As a result, in the roll body according to the present embodiment, even when a foreign substance is sandwiched, the influence of the foreign substance on the light diffusion control film 12 is suppressed by at least one of the first film 11a and the second film 11b. .. As a result, the generation of dents on the light diffusion control film 12 is satisfactorily suppressed. From this viewpoint, the thickness of at least one of the first film 11a and the second film 11b is preferably 60 μm or more, and particularly preferably 70 μm or more. On the other hand, the upper limit of the thickness of at least one of the first film 11a and the second film 11b is not particularly limited, and may be, for example, 1000 μm or less, particularly 500 μm or less, and further 200 μm or less. It may be.

In the roll body according to the present embodiment, even if only one of the first film 11a and the second film 11b has a thickness of 45 μm or more and the other thickness is less than 45 μm, the thickness is 45 μm or more. The influence of foreign matter can be sufficiently suppressed by the film having. On the other hand, when both the first film 11a and the second film 11b have a thickness of 45 μm or more, the influence of foreign matter can be suppressed by these two films, and the generation of dents can be further suppressed. Can be done.

The composition and materials of the first film 11a and the second film 11b are not particularly limited as long as they satisfy the above-mentioned thickness conditions of the first film 11a and the second film 11b. For example, these films may be a desired base material or a release sheet as described below. Further, these films may be composed of a resin-based sheet containing a resin-based material as a main component, or may be composed of a paper-based material. The configurations and materials of the first film 11a and the second film 11b may be the same as or different from each other.

Examples of the resin component in the resin-based sheet include polyethylene, polypropylene, polybutene, polybutadiene, polymethylpentene, ethylene-norbornene copolymer, polyolefin such as norbornene resin, polyethylene terephthalate, polyethylene naphthalate, and polyester such as polybutylene terephthalate. Examples thereof include resins such as polyvinyl chloride, vinyl chloride copolymer, polyimide, polyetherimide, polycarbonate, polyphenylene sulfide, and liquid crystal polymer. These resin sheets may be a sheet composed of a single layer, or may be a sheet in which a plurality of layers of the same type or different types are laminated. Among the above, polyethylene terephthalate film is preferable.

Specific examples of the case where the first film 11a or the second film 11b is composed of a paper-based material include a paper base material such as glassin paper, coated paper, and high-quality paper, and heat such as polyethylene on the above paper base material. Examples thereof include laminated paper laminated with a plastic resin.

At least one of the first film 11a and the second film 11b is formed by subjecting one side (preferably the surface on the light diffusion control film 12 side) of the above-mentioned resin-based sheet or paper-based material to a peeling treatment. It may be a release sheet. Examples of the release agent used in the release treatment include alkyd-based, silicone-based, fluorine-based, unsaturated polyester-based, polyolefin-based, and wax-based release agents.

(2) Light Diffusion Control Film The light diffusion control film 12 in the present embodiment has an internal structure having a plurality of regions having a relatively high refractive index in a region having a relatively low refractive index in the film. is there. Further, the light diffusion control film 12 in the present embodiment is provided with a plurality of regions having a relatively high refractive index extending in the film in a region having a relatively low refractive index so as to extend in the thickness direction. It is preferable that it has a structure.

An example of the internal structure is a column structure in which a plurality of columnar objects having a relatively high refractive index are planted in a region having a relatively low refractive index in the film thickness direction. Another example is a louver structure in which a plurality of plate-shaped regions having different refractive indexes are alternately arranged in any one direction along the film surface.

(2-1) Structure of Light Diffusion Control Film The specific structure and composition of the light diffusion control film 12 in the present embodiment are not particularly limited, and conventionally known ones can be used. As an example of the preferable light diffusion control film 12, a high refractive index component having one or two polymerizable functional groups, a refractive index lower than that of the high refractive index component, and one or two polymerizations are performed. Examples thereof include those obtained by curing a composition for a light diffusion control film containing a low refractive index component having a sex functional group. By using such a high refractive index component and a low refractive index component, the above-mentioned internal structure can be easily formed satisfactorily.

Preferred examples of the high refractive index component include (meth) acrylic acid ester containing an aromatic ring, and particularly preferably (meth) acrylic acid ester containing a plurality of aromatic rings. Examples of (meth) acrylic acid esters containing multiple aromatic rings include biphenyl (meth) acrylate, naphthyl (meth) acrylate, anthracyl (meth) acrylate, benzylphenyl (meth) acrylate, (meth). Biphenyloxyalkyl acrylate, naphthyloxyalkyl (meth) acrylate, anthracyloxyalkyl (meth) acrylate, benzylphenyloxyalkyl (meth) acrylate, etc., some of which are halogens, alkyls, alkoxys, alkyl halides, etc. Etc., which have been replaced by the above. Among these, biphenyl (meth) acrylate is preferable from the viewpoint of easily forming a good internal structure, and specifically, o-phenylphenoxyethyl acrylate, o-phenylphenoxyethoxyethyl acrylate and the like are preferable. In addition, in this specification, (meth) acrylic acid means both acrylic acid and methacrylic acid. The same applies to other similar terms.

The weight average molecular weight of the high refractive index component is preferably 2500 or less, particularly preferably 1500 or less, and further preferably 1000 or less. The weight average molecular weight of the high refractive index component is preferably 150 or more, particularly preferably 200 or more, and further preferably 250 or more. When the weight average molecule of the high refractive index component is in the above range, it becomes easy to form the light diffusion control film 12 having a desired internal structure. The weight average molecular weight in the present specification is a standard polystyrene-equivalent value measured by a gel permeation chromatography (GPC) method.

The refractive index of the high refractive index component is preferably 1.45 or more, more preferably 1.50 or more, particularly preferably 1.54 or more, and further preferably 1.56 or more. Is preferable. The refractive index of the high refractive index component is preferably 1.70 or less, particularly preferably 1.65 or less, and further preferably 1.59 or less. When the refractive index of the high refractive index component is in the above range, it becomes easy to form the light diffusion control film 12 having a desired internal structure. The refractive index in the present specification means the refractive index of a predetermined component before curing the composition for a light diffusion control film, and the refractive index is measured according to JIS K0062: 1992. Is.

The content of the high refractive index component in the composition for the light diffusion control film is preferably 25 parts by mass or more, particularly preferably 40 parts by mass or more, with respect to 100 parts by mass of the low refractive index component. Further, it is preferably 50 parts by mass or more. Further, the content of the high refractive index component in the composition for the light diffusion control film is preferably 400 parts by mass or less, particularly 300 parts by mass or less, with respect to 100 parts by mass of the low refractive index component. It is preferable, and more preferably 200 parts by mass or less. When the content of the high refractive index component is within these ranges, the region derived from the high refractive index component and the region derived from the low refractive index component are a desired ratio in the internal structure of the formed light diffusion control film. As a result, the light diffusion control film can easily achieve the desired light diffusivity.

Preferred examples of the low refractive index component include urethane (meth) acrylate, (meth) acrylic polymer having a (meth) acryloyl group in the side chain, (meth) acryloyl group-containing silicone resin, unsaturated polyester resin, and the like. However, it is particularly preferable to use urethane (meth) acrylate.

The urethane (meth) acrylate is preferably formed from (a) a compound containing at least two isocyanate groups, (b) polyalkylene glycol, and (c) hydroxyalkyl (meth) acrylate.

Preferred examples of the above-mentioned (a) compound containing at least two isocyanate groups are 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 1,3-xylylene diisocyanate, 1, Aromatic polyisocyanates such as 4-xylylene diisocyanate, aliphatic polyisocyanates such as hexamethylene diisocyanate, alicyclic polyisocyanates such as isophorone diisocyanate (IPDI) and hydrogenated diphenylmethane diisocyanate, And adducts (eg, xylylene diisocyanates) which are reactants with these biurets, isocyanurates, and low molecular weight active hydrogen-containing compounds such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylpropane, and castor oil. Nart-based trifunctional isocyanate body) and the like. Among these, alicyclic polyisocyanate is preferable, and alicyclic diisocyanate containing only two isocyanate groups is particularly preferable.

Preferred examples of the above-mentioned (b) polyalkylene glycol include polyethylene glycol, polypropylene glycol, polybutylene glycol, polyhexylene glycol and the like, and polypropylene glycol is particularly preferable.

The weight average molecular weight of (b) polyalkylene glycol is preferably 2300 or more, particularly preferably 4300 or more, and further preferably 6300 or more. Further, (b) the weight average molecular weight of the polyalkylene glycol is preferably 19,500 or less, particularly preferably 14300 or less, and further preferably 12300 or less.

Preferred examples of the above-mentioned (c) hydroxyalkyl (meth) acrylate include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, and 2-hydroxybutyl (meth) acrylate. ) Acrylate, 3-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate and the like. Among these, 2-hydroxyethyl methacrylate is preferably used from the viewpoint of reducing the polymerization rate of the obtained urethane (meth) acrylate and forming a predetermined internal structure more efficiently.

The synthesis of urethane (meth) acrylate using the above-mentioned components (a) to (c) as materials can be carried out according to a conventional method. At this time, the blending ratio of the components (a) to (c) is the molar ratio of the component (a): the component (b): the component (c) = from the viewpoint of efficiently synthesizing the urethane (meth) acrylate. The ratio is preferably 1 to 5: 1: 1 to 5, particularly preferably 1 to 3: 1: 1 to 3, and further preferably 2: 1: 2.

The weight average molecular weight of the low refractive index component is preferably 3000 or more, particularly preferably 5000 or more, and further preferably 7000 or more. The weight average molecular weight of the low refractive index component is preferably 20000 or less, particularly preferably 15000 or less, and further preferably 13000 or less. When the weight average molecular weight of the low refractive index component is within the above range, it becomes easy to form the light diffusion control film 12 having desired performance.

The refractive index of the low refractive index component is preferably 1.59 or less, more preferably 1.50 or less, particularly preferably 1.49 or less, and further preferably 1.48 or less. Is preferable. The refractive index of the low refractive index component is preferably 1.30 or more, particularly preferably 1.40 or more, and further preferably 1.46 or more. When the refractive index of the low refractive index component is in the above range, it becomes easy to form a desired light diffusion control film.

The composition for a light diffusion control film described above may contain other additives in addition to the high refractive index component and the low refractive index component. Other additives include, for example, a polyfunctional monomer (a compound having three or more polymerizable functional groups), a photopolymerization initiator, an antioxidant, an ultraviolet absorber, an antioxidant, a polymerization accelerator, and a polymerization inhibitor. , Infrared absorbers, plasticizers, diluent solvents, leveling agents and the like.

Among the additives described above, the composition for a light diffusion control film preferably contains a polyfunctional monomer. As a result, the obtained light diffusion control film 12 has relatively high elasticity, and dents are generated when the light diffusion control film 12 is manufactured, and when the light diffusion control film is laminated on other members. It becomes easier to suppress the occurrence of crushing more effectively.

It is also preferable that the composition for a light diffusion control film contains a photopolymerization initiator. When the composition for a light diffusion control film contains a photopolymerization initiator, it becomes easy to efficiently form a light diffusion control film having a desired internal structure.

Examples of photopolymerization initiators include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-Diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexylphenylketone, 2-methyl-1- [4- (methylthio) phenyl]- 2-morpholino-propane-1-one, 4- (2-hydroxyethoxy) phenyl-2- (hydroxy-2-propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4-diethylaminobenzophenone, dichlorobenzophenone, 2- Methylanthraquinone, 2-ethylanthraquinone, 2-tershaly butyl anthraquinone, 2-aminoanthraquinone, 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, benzyl Examples thereof include dimethyl ketal, acetphenone dimethyl ketal, p-dimethylamine benzoic acid ester, oligo [2-hydroxy-2-methyl-1- [4- (1-methylvinyl) phenyl] propane] and the like. These may be used individually by 1 type and may be used in combination of 2 or more type.

When a photopolymerization initiator is used, the content of the photopolymerization initiator in the composition for a light diffusion control film is 0.2 with respect to 100 parts by mass of the total amount of the high refractive index component and the low refractive index component. The amount is preferably parts by mass or more, particularly preferably 0.5 parts by mass or more, and further preferably 1 part by mass or more. The content of the photopolymerization initiator is preferably 20 parts by mass or less, particularly 15 parts by mass or less, based on 100 parts by mass of the total amount of the high refractive index component and the low refractive index component. It is preferable, and more preferably 10 parts by mass or less. By setting the content of the photopolymerization initiator in the composition for the light diffusion control film within the above range, the light diffusion control film 12 can be easily formed efficiently.

The composition for a light diffusion control film can be adjusted by uniformly mixing the above-mentioned high refractive index component and low refractive index component, and if desired, other additives. At the time of mixing, the composition for a uniform light diffusion control film may be obtained by stirring while heating to a temperature of 40 to 80 ° C. Further, a diluting solvent may be added and mixed so that the obtained composition for a light diffusion control film has a desired viscosity.

(2-2) Push-in elastic modulus of light diffusion control film The push-in elasticity of the light diffusion control film 12 in the present embodiment at 23 ° C. is preferably 1 MPa or more, particularly 10 MPa or more as a lower limit value. It is preferable, and more preferably 20 MPa or more. When the lower limit of the indentation elastic modulus is in the above range, it is possible to more effectively suppress the occurrence of dents in the light diffusion control film 12. The indentation elastic modulus is preferably 5000 MPa or less, more preferably 1000 MPa or less, particularly preferably 300 MPa or less, and further preferably 40 MPa or less as the upper limit value. When the upper limit value of the indentation elastic modulus is in the above range, the light diffusion control film 12 has appropriate flexibility, and the light diffusion control film 12 can easily have the desired handleability. The details of the method for measuring the indentation elastic modulus are as described in Examples described later.

(2-3) Thickness of Light Diffusion Control Film The thickness of the light diffusion control film 12 in the present embodiment is preferably 20 μm or more, particularly preferably 40 μm or more, and further 60 μm as the lower limit value. The above is preferable. When the lower limit of the thickness of the light diffusion control film 12 is within the above range, it becomes easy to exhibit the desired light diffusion property. The upper limit of the thickness of the light diffusion control film 12 is preferably 700 μm or less, particularly preferably 400 μm or less, and further preferably 200 μm or less. When the upper limit of the thickness of the light diffusion control film 12 is within the above range, it becomes easier to more effectively suppress the occurrence of dents.

(2-4) Percentage of Internal Structure of Light Diffusion Control Film in the Thickness Direction As described above, the light diffusion control film 12 in the present embodiment has a relative refractive index in a region having a relatively low refractive index in the film. It is preferable that the internal structure is provided so as to extend a plurality of particularly high regions in the thickness direction. Here, the ratio extending in the thickness direction of the internal structure is preferably 10% or more of the thickness of the light diffusion control film 12 from the viewpoint of making the light diffusivity more efficient. It is more preferably% or more, and particularly preferably 50% or more. The upper limit is not limited, and the internal structure may be formed at 100%, that is, in all directions in the thickness direction.

(3) Adhesive Layer The laminated sheet in the present embodiment may include an adhesive layer 13. By providing the pressure-sensitive adhesive layer 13, the light diffusion control film 12 supplied from the roll body according to the present embodiment can be easily fixed to a desired member via the pressure-sensitive adhesive layer 13. In the roll body according to the present embodiment, as described above, the occurrence of dents is suppressed by satisfying the above-mentioned thickness conditions of the first film 11a and the second film 11b. Therefore, from the viewpoint of suppressing the occurrence of dents, it is not necessary to intentionally provide the pressure-sensitive adhesive layer 13.

The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 13 is not particularly limited as long as it has desired adhesiveness and does not impair the above-mentioned effect of suppressing the occurrence of dents, and conventionally known pressure-sensitive adhesives may be used. it can. For example, as the pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, or the like can be used, and among them, an acrylic-based adhesive that easily achieves good adhesiveness and transparency. Adhesives are preferred.

Examples of the acrylic pressure-sensitive adhesive described above include a pressure-sensitive adhesive obtained by cross-linking a pressure-sensitive adhesive composition containing a (meth) acrylic acid ester polymer and a cross-linking agent. In addition, in this specification, the concept of "polymer" is also included in "polymer".

The (meth) acrylic acid ester polymer preferably contains a reactive group-containing monomer having a reactive group in the molecule that reacts with the cross-linking agent as a monomer unit constituting the polymer. When the reactive group reacts with the cross-linking agent described later, the cohesive force of the obtained pressure-sensitive adhesive is controlled, and the storage elastic modulus can be easily adjusted in a suitable range. As the functional group-containing monomer, a monomer having a polymerizable double bond and a functional group such as a hydroxy group, a carboxy group, or an amino group in the molecule is preferable, and among these, a carboxy group is contained as a functional group. It is preferable to use at least one of a monomer (carboxy group-containing monomer) and a hydroxy group-containing monomer (hydroxy group-containing monomer).

Examples of the carboxy group-containing monomer include ethylenically unsaturated carboxylic acids such as acrylic acid and methacrylic acid, and among these, acrylic acid is preferable. In addition, preferable examples of the above-mentioned hydroxy group-containing monomer include 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate and the like. These may be used alone or in combination of two or more.

The (meth) acrylic acid ester polymer preferably contains 1% by mass or more of the structural unit derived from the functional group-containing monomer, and particularly preferably 5% by mass or more. Further, the polymer preferably contains the structural unit in an amount of 40% by mass or less, and particularly preferably 20% by mass or less.

From the viewpoint of developing adhesive strength, the (meth) acrylic acid ester polymer preferably contains a (meth) acrylic acid alkyl ester as a monomer unit constituting the polymer, and in particular, the alkyl group has 1 carbon atom. It is preferable to use an acrylic acid alkyl ester of ~ 18. Specific examples thereof include methyl (meth) acrylate, n-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate and the like. These may be used alone or in combination of two or more.

From the viewpoint of achieving both adhesive strength and storage elastic modulus, the (meth) acrylic acid ester polymer preferably contains 50% by mass or more of the structural unit derived from the (meth) acrylic acid alkyl ester, particularly 80. It is preferably contained in an amount of% by mass or more. Further, the polymer preferably contains the structural unit in an amount of 99% by mass or less, and particularly preferably 95% by mass or less.

The (meth) acrylic acid ester polymer may be a copolymer of the above-mentioned functional group-containing monomer and (meth) acrylic acid alkyl ester and other monomers. Further, regarding the polymerization mode of the polymer, it may be a random copolymer or a block copolymer. Further, the polymer may be used alone or in combination of two or more.

The weight average molecular weight of the (meth) acrylic acid ester polymer is preferably 300,000 or more, and particularly preferably 1 million or more, from the viewpoint of making the storage elastic modulus suitable. The weight average molecular weight is preferably 2.5 million or less, and particularly preferably 2 million or less.

The cross-linking agent may be any one that reacts with the reactive functional group of the (meth) acrylic acid ester polymer, and for example, an epoxy-based cross-linking agent, an isocyanate-based cross-linking agent, or the like is preferably used. The cross-linking agent may be used alone or in combination of two or more.

The content of the cross-linking agent in the adhesive composition is preferably 0.01 part by mass or more, particularly 0.1 part by mass or more, based on 100 parts by mass of the (meth) acrylic acid ester polymer. Is preferable. The content is preferably 10 parts by mass or less, and particularly preferably 5 parts by mass or less.

If desired, the tacky composition may include various additives commonly used in acrylic pressure-sensitive adhesives, such as active energy ray-curable components, photopolymerization initiators, silane coupling agents, antistatic agents, and tackifiers. , Antistatic agents, light stabilizers, softeners, fillers, refractive index adjusters and the like can be added.

When the adhesive composition contains an active energy ray-curable component, the pressure-sensitive adhesive layer 13 composed of the active energy ray-curable pressure-sensitive adhesive can be formed. The active energy ray-curable component is not particularly limited as long as it is a component capable of curing the pressure-sensitive adhesive layer 13 by irradiation with active energy rays, and may be any monomer, oligomer or polymer, or a mixture thereof. It may be. Among them, a polyfunctional acrylate-based monomer having excellent compatibility with a (meth) acrylic acid ester copolymer or the like can be preferably mentioned. The storage elastic modulus of the pressure-sensitive adhesive obtained by using the active energy ray-curable component can be increased.

The tacky composition can be produced by producing a (meth) acrylic acid ester polymer and mixing the obtained (meth) acrylic acid ester polymer with a cross-linking agent and, if desired, an additive. .. The (meth) acrylic acid ester polymer can be produced by polymerizing a mixture of monomers constituting the polymer by an ordinary radical polymerization method. The polymerization of the (meth) acrylic acid ester polymer is preferably carried out by a solution polymerization method using a polymerization initiator, if desired. The adhesive composition may be used as a coating solution of the adhesive composition by adding a diluting solvent and mixing the adhesive well.

The storage elastic modulus of the pressure-sensitive adhesive layer 13 at 23 ° C. in the present embodiment is preferably 0.01 MPa or more, more preferably 0.11 MPa or more, particularly preferably 0.20 MPa or more, and further. Is preferably 0.40 MPa or more. The storage elastic modulus of the pressure-sensitive adhesive layer 13 at 23 ° C. is preferably 50 MPa or less, particularly preferably 10 MPa or less, and further preferably 1 MPa or less. When the storage elastic modulus of the pressure-sensitive adhesive layer 13 at 23 ° C. is within the above range, the influence of foreign matter sandwiched between the rolls can be easily reduced by the pressure-sensitive adhesive layer 13 while ensuring the adhesive strength. In particular, when the storage elastic modulus is 0.01 MPa or more, it is easy to exert an effect on eliminating dents from the first film side (the film laminated on the side not in contact with the adhesive layer in the light diffusion control film). It becomes a thing. Thereby, the generation of dents on the light diffusion control film 12 can be suppressed more effectively. The storage elastic modulus of the pressure-sensitive adhesive layer 13 at 23 ° C. means that when the pressure-sensitive adhesive layer 13 is made of the above-mentioned active energy ray-curable pressure-sensitive adhesive, the pressure-sensitive adhesive layer 13 is cured by irradiation with active energy rays. It refers to the storage elastic modulus of the agent layer 13. The details of the method for measuring the storage elastic modulus are as described in Test Examples described later.

The thickness of the pressure-sensitive adhesive layer 13 is preferably 1000 μm or less, more preferably 100 μm or less, particularly preferably 50 μm or less, and further preferably 20 μm or less. When the thickness of the pressure-sensitive adhesive layer 13 is 1000 μm or less, it becomes easy to suppress the occurrence of dents in the pressure-sensitive adhesive layer 13. The thickness of the pressure-sensitive adhesive layer 13 is preferably 1 μm or more, particularly preferably 5 μm or more, and further preferably 10 μm or more. When the thickness of the pressure-sensitive adhesive layer 13 is 1 μm or more, the desired adhesiveness can be easily exhibited.

(4) Others The laminated sheet 1 in the present embodiment may include a layer other than the above-mentioned layer as long as the effect of suppressing dents is not impaired. Further, the roll body according to the present embodiment may be formed by winding the laminated sheet 1 around a core material.

The winding core is not particularly limited as long as the laminated sheet 1 in the present embodiment can be wound, and a known one can be used. The material constituting the core material is preferably one having sufficient strength for winding the laminated sheet 1, and examples thereof include resin, metal, and wood.

2. 2. Method for Manufacturing Rolled Sheet of Laminated Sheet The method for manufacturing the rolled body of laminated sheet according to the present embodiment is not particularly limited, and a conventionally known method can be adopted.

As an example, after obtaining a laminated body (first laminated body) formed by laminating the first film 11a and the light diffusion control film 12, the surface of the first laminated body on the light diffusion control film 12 side is formed. On the other hand, the second film 11b is attached. By winding the laminated sheet 1 obtained by laminating the first film 11a, the light diffusion control film 12, and the second film 11b in this order, a rolled body of the laminated sheet according to the present embodiment is obtained. be able to.

Further, a laminate formed by laminating the first film 11a and the light diffusion control film 12 (first laminate) and a laminate formed by laminating the second film 11b and the pressure-sensitive adhesive layer 13 (second laminate). Laminate) is prepared. Then, the surface of the first laminated body on the light diffusion control film 12 side and the surface of the second laminated body on the adhesive layer 13 side are bonded together. The lamination according to the present embodiment can also be obtained by winding the laminated sheet 1 obtained by laminating the first film 11a, the light diffusion control film 12, the pressure-sensitive adhesive layer 13 and the second film 11b in this order. A roll of sheet can be obtained.

The method for producing the laminate (first laminate) formed by laminating the first film 11a and the light diffusion control film 12 described above is also not particularly limited, and can be produced by a conventionally known method. For example, after the above-mentioned composition for light diffusion control film is applied to one side of a process sheet to form a coating film, one side of the first film 11a is attached to the surface of the coating film opposite to the process sheet. It fits. Subsequently, the light diffusion control film 12 is formed by irradiating the coating film with active energy rays and curing the coating film through the first film 11a. By laminating the first film 11a on the coating film in this way, the gap between the first film 11a and the process sheet is maintained, the coating film is suppressed from being crushed, and light diffusion having a uniform thickness is achieved. The control film 12 can be easily formed. By forming the light diffusion control film 12 as described above, the first laminated body composed of the first film 11a and the light diffusion control film 12 is in a state where the process film is attached to the surface of the light diffusion control film 12. Can be obtained at.

Examples of the coating method described above include a knife coating method, a roll coating method, a bar coating method, a blade coating method, a die coating method, and a gravure coating method. Moreover, the composition for a light diffusion control film may be diluted with a solvent if necessary.

Irradiation of the coating film with active energy rays is performed in a different manner depending on the internal structure to be formed. Such irradiation can be performed by a conventionally known method. For example, when forming the column structure described above, the coating film is irradiated with parallel light having a high degree of parallelism of light rays. On the other hand, when the above-mentioned louver structure is formed, a linear light source is used as a light source of active energy rays, and the surface of the laminate is random in the width direction (TD direction) and substantially in the flow direction (MD direction). Irradiate parallel strip-shaped (almost linear) light.

The active energy ray refers to an electromagnetic wave or a charged particle beam having an energy quantum, and specific examples thereof include ultraviolet rays and electron beams. Among the active energy rays, ultraviolet rays, which are easy to handle, are particularly preferable.

When ultraviolet rays are used as active energy rays to form a column structure, it is preferable that the peak illuminance on the coating film surface is 0.1 to 10 mW / cm ² as the irradiation condition. The peak illuminance referred to here means a measured value at a portion where the active energy ray irradiated on the coating film surface shows the maximum value. Further, the integrated light amount on the surface of the coating film is preferably 5 to 200 mJ / cm ² .

When ultraviolet rays are used as active energy rays to form a louver structure, the peak illuminance on the coating film surface is preferably 0.1 to 50 mW / cm ² or less as the irradiation condition. Further, the integrated light amount on the surface of the coating film is preferably 5 to 300 mJ / cm ² or less.

From the viewpoint of completing more reliable curing, after curing using parallel light or band-shaped light as described above, a process of converting to normal active energy rays (parallel light or band-shaped light) is performed. It is also preferable to irradiate with no active energy rays, scattered light).

The method for producing the laminate (second laminate) formed by laminating the second film 11b and the pressure-sensitive adhesive layer 13 described above is also not particularly limited, and can be performed by a conventionally known method. For example, the pressure-sensitive adhesive material constituting the pressure-sensitive adhesive layer 13 is applied to one surface of the second film 11b. The pressure-sensitive adhesive layer 13 can be formed by drying the coating film thus obtained.

By winding the laminated sheet 1 manufactured as described above, a rolled body of the laminated sheet can be obtained. At this time, the laminated sheet 1 may be wound around the core material described above. Further, the above-mentioned first laminated body (and the second laminated body) may be manufactured, the laminated sheet 1 may be formed, and the formed laminated sheet 1 may be continuously wound. For example, the first laminated body and the second laminated body are manufactured upstream in the flow direction, and the obtained first laminated body and the second laminated body are laminated downstream in the flow direction, thereby. A rolled body may be obtained by further winding the obtained laminated sheet 1.

3. 3. Use of Roll Body of Laminated Sheet The roll body of the laminated sheet according to the present embodiment can be used for providing the light diffusion control film 12. For example, the laminated sheet 1 is unwound from the roll body, cut into a desired shape, the first film 11a and the second film 11b are peeled off at a desired timing, and then the light diffusion control film 12 (cut into a desired shape) ( When the laminated sheet 1 includes the pressure-sensitive adhesive layer 13, a laminated body of the light diffusion control film 12 and the pressure-sensitive adhesive layer 13) can be provided. Such a light diffusion control film 12 can be satisfactorily used for manufacturing a liquid crystal display device, an organic light emitting device, electronic paper, and the like.

In particular, according to the roll body of the laminated sheet according to the present embodiment, the occurrence of dents on the light diffusion control film 12 can be satisfactorily suppressed. Therefore, the light diffusion control film 12 provided from the roll body according to the present embodiment does not impair the performance such as light diffusivity. Then, by using such a light diffusion control film, it becomes possible to manufacture an apparatus having desired performance.

The embodiments described above have been described for facilitating the understanding of the present invention, and have not been described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

Hereinafter, the present invention will be described in more detail with reference to Examples and the like, but the scope of the present invention is not limited to these Examples and the like.

[Example 1]
(1) Formation of Light Diffusion Control Film 40 mass of polyether urethane methacrylate having a weight average molecular weight of 9,900 obtained by reacting polypropylene glycol, isophorone diisocyanate, and 2-hydroxyethyl methacrylate as low refractive index components. 60 parts by mass of o-phenylphenoxyethoxyethyl acrylate having a molecular weight of 268 as a high refractive index component and 2-hydroxy-2-methyl-1 as a photopolymerization initiator with respect to parts (solid content conversion value; the same applies hereinafter). After adding 8 parts by mass of −phenylpropane-1-one, the mixture was heated and mixed under the condition of 80 ° C. to obtain a composition for a light diffusion control film.

The obtained composition for a light diffusion control film was applied to one side of a long polyethylene terephthalate sheet as a process sheet to form a coating film. Subsequently, a release sheet (manufactured by Lintec Corporation, product name "SP-PET381130", manufactured by Lintec Corporation, in which one side of a polyethylene terephthalate film as a first film was peeled off with a silicone-based release agent on the surface of the coating film opposite to the process sheet. , Thickness: 38 μm), and the peeled surfaces were laminated.

The laminate composed of the first film, the coating film, and the process sheet thus obtained was placed on a conveyor. At this time, the surface of the laminated body on the first film side is on the upper side, and the longitudinal direction of the laminated body is parallel to the flow direction of the conveyor. Then, an ultraviolet spot parallel light source (manufactured by Jatec) whose central ray parallelism was controlled within ± 3 ° was installed on the conveyor on which the laminated body was placed. At this time, the light source was installed so as to be able to irradiate parallel light in a direction inclined by 15 ° to the side opposite to the flow direction of the conveyor with respect to the normal direction of the surface on the first film side of the laminated body. Further, it was installed so that the distance between the surface of the first film and the light source was 240 mm.

After that, the conveyor was operated to move the laminate at a speed of 0.2 m / min, and the parallelism was obtained under the conditions of a peak illuminance of 2.00 mW / cm ² and an integrated light intensity of 53.13 mJ / cm ^{2 on} the surface of the coating film. The coating film in the laminate was cured by irradiating parallel light (main peak wavelength 365 nm, other ultraviolet rays from a high-pressure mercury lamp having peaks at 254 nm, 303 nm, and 313 nm) of 2 ° or less. As a result, a light diffusion control film having a thickness of 60 μm was formed by curing the above-mentioned coating film. Further, by peeling the process sheet from the laminated body, a first laminated body in which the first film and the light diffusion control film were laminated in this order was obtained.

The indentation elastic modulus of the obtained light diffusion control film at 23 ° C. was measured using an ultramicro hardness tester (“Shimadzu Dynamic Ultra Micro Hardness Tester DUH-W201S” manufactured by Shimadzu Corporation). It was 27 MPa. Further, when the cross section of the formed light diffusion control film was observed under a microscope, a column structure in which a plurality of columnar objects were planted in the entire thickness direction was formed inside the light diffusion control film. Was confirmed. That is, the ratio of the column structure region extending in the thickness direction inside the obtained light diffusion control film was 100%. Further, it was confirmed that the above-mentioned columnar object was inclined by 20 ° (inclination angle −20 °) on the side opposite to the traveling direction of the conveyor with respect to the thickness direction of the light diffusion control film. The inclination angle is described as 0 ° in the film surface normal direction, plus in the conveyor traveling direction, and minus in the opposite direction.

The peak illuminance and the integrated light amount described above were measured by installing a UV METER (manufactured by Eye Graphics Co., Ltd., product name "eye ultraviolet integrated illuminance meter UVPF-A1") equipped with a receiver at the position of the coating film. It is a thing. The thickness of the light diffusion control film was measured using a constant pressure thickness measuring device (manufactured by Takara Seisakusho Co., Ltd., product name "Teklock PG-02J").

(2) Formation of Adhesive Layer 90 parts by mass of n-butyl acrylate and 10 parts by mass of acrylic acid were polymerized by a solution polymerization method to obtain a (meth) acrylic acid ester polymer. The weight average molecular weight (Mw) of this (meth) acrylic acid ester polymer was measured by the method described later and found to be 400,000.

100 parts by mass of the (meth) acrylic acid ester polymer obtained above and 1,3-bis (N, N'-diglycidylaminomethyl) cyclohexane as a cross-linking agent (manufactured by Mitsubishi Gas Chemical Company, product name "TETRAD") -C ") 0.05 parts by mass was mixed in a solvent to obtain a coating liquid for the pressure-sensitive adhesive composition.

Subsequently, a release sheet (manufactured by Lintec Corporation, product name "SP-PET752150", manufactured by Lintec Corporation), in which one side of a polyethylene terephthalate film as a second film was peeled off with a silicone-based release agent, from the obtained coating liquid of the pressure-sensitive adhesive composition. A pressure-sensitive adhesive layer having a thickness of 25 μm was formed on the second film by applying the coating on the peeled surface having a thickness of 75 μm and heating at 90 ° C. for 1 minute. As a result, a second laminate obtained by laminating the second film and the pressure-sensitive adhesive layer was obtained.

The storage elastic modulus of the formed pressure-sensitive adhesive layer at 23 ° C. was measured by Test Example 1 described later and found to be 0.16 MPa. The above-mentioned thickness of the pressure-sensitive adhesive layer is a value measured using a constant pressure thickness measuring device (manufactured by Teclock Co., Ltd., product name "PG-02") in accordance with JIS K7130.

(3) Formation of Laminated Sheet The surface on the light diffusion control film side in the first laminate obtained in the above step (1) and the pressure-sensitive adhesive layer side in the second laminate obtained in the above step (2). The first film, the light diffusion control film, the adhesive layer, and the second film are formed by seasoning for 168 hours in an environment of a temperature of 23 ° C. and a relative humidity of 50% after bonding the surfaces of the above. A laminated sheet formed by laminating in this order was obtained.

Here, the above-mentioned weight average molecular weight (Mw) is a standard polystyrene-equivalent weight average molecular weight measured under the following conditions (GPC measurement) using gel permeation chromatography (GPC).
<Measurement conditions>
-Measuring device: HLC-8320 manufactured by Tosoh Corporation
-GPC column (passed in the following order): TSK gel superH-H manufactured by Tosoh Corporation
TSK gel superHM-H
TSK gel superH2000
・ Measurement solvent: tetrahydrofuran ・ Measurement temperature: 40 ° C

[Examples 2 to 4, Comparative Example 1]
Laminated sheets were produced in the same manner as in Example 1 except that the thicknesses of the first film and the second film were changed as shown in Table 1.

[Example 5]
98.5 parts by mass of n-butyl acrylate and 1.5 parts by mass of 2-hydroxyethyl acrylate are polymerized by a solution polymerization method to obtain a (meth) acrylic acid ester weight having a weight average molecular weight (Mw) of 2 million. Combined A was obtained.

Further, 95 parts by mass of n-butyl acrylate and 5 parts by mass of acrylic acid were polymerized by a solution polymerization method to obtain a (meth) acrylic acid ester polymer B having a weight average molecular weight (Mw) of 2 million.

The weight average molecular weight (Mw) of these (meth) acrylic acid ester polymers was measured under the same conditions as in Example 1.

Subsequently, 100 parts by mass of the (meth) acrylic acid ester polymer A, 10 parts by mass of the (meth) acrylic acid ester polymer B, and tris (acryloxyethyl) isocyanurate (Toa synthesis) as an active energy ray-curable component. 15 parts by mass of trimethylolpropane-modified tolylene diisocyanate (manufactured by Toso Co., Ltd., product name "Coronate L") as a cross-linking agent is mixed in a solvent with 15 parts by mass of the product name "Aronix 315"). , A coating solution of the pressure-sensitive adhesive composition was obtained.

A release sheet (manufactured by Lintec Corporation, product name "SP-PET752150", thickness: 75 μm) obtained by peeling one side of a polyethylene terephthalate film as a second film with a silicone-based release agent from the above-mentioned coating liquid of the pressure-sensitive adhesive composition. ) Was applied on the peeled surface with a knife-type coating machine, and then dried at 90 ° C. for 1 minute to form a coating film.

Next, a release sheet (manufactured by Lintec Corporation, product name "SP-PET382120", thick) in which one side of the polyethylene terephthalate film was peeled off with a silicone-based release agent on the surface of the formed coating film opposite to the second film. The peeled surface (38 μm) was bonded. Thirty minutes after the bonding, ultraviolet rays (UV) were irradiated through the second film under the following conditions to form a 15 μm-thick pressure-sensitive adhesive layer in which the coating film was cured. Then, by peeling the release sheet (thickness 38 μm) from the pressure-sensitive adhesive layer, a second laminate obtained by laminating the second film and the pressure-sensitive adhesive layer was obtained.
<UV irradiation conditions>
Fusion Co. electrodeless lamp H bulb use and intensity: 600mW / cm ^2, light quantity: 150 mJ / cm ²
・ UV illuminance / photometer uses "UVPF-36" manufactured by iGraphics.

A laminated sheet was produced in the same manner as in Example 1 except that the second laminated body obtained as described above was used.

The storage elastic modulus of the formed pressure-sensitive adhesive layer at 23 ° C. was measured by Test Example 1 described later and found to be 0.59 MPa.

[Example 6, Comparative Example 2]
Laminated sheets were produced in the same manner as in Example 5, except that the thicknesses of the first film and the second film were changed as shown in Table 2.

[Test Example 1] (Measurement of storage elastic modulus of adhesive layer)
A plurality of seasoned adhesive layers obtained in Examples and Comparative Examples were laminated to obtain a laminated body having a thickness of 3 mm. A cylinder (height 3 mm) having a diameter of 8 mm was punched out from the obtained laminated body of the pressure-sensitive adhesive layer, and this was used as a sample.

The above sample is subjected to a torsional shear method using a viscoelasticity measuring instrument (manufactured by REOMETRIC, product name "DYNAMIC ANALAYZER") in accordance with JIS K7244-6, and has a storage elastic modulus (G') (MPa) under the following conditions. Was measured.
Measurement frequency: 1Hz
Measurement temperature: 23 ° C

[Test Example 2] (Measurement of dents)
(1) About Example 1, Example 2 and Comparative Example 1 Glass in which the laminated sheets of Example 1, Example 2 and Comparative Example 1 are horizontally installed so that the surface on the second film side faces up. It was fixed on the board. Then, using a hardness tester (manufactured by Polymer Instruments Co., Ltd., product name "Asker hardness tester C2"), the tip of the push core is a hemisphere with a diameter of 2.54 mm with respect to the surface on the second film side of the laminated sheet. , A point load was applied for 10 seconds with a load of 225 g.

After 5 minutes have passed from the application of the above point load, the second film is peeled off from the laminated sheet, and the depth (μm) of the dents remaining on the exposed surface of the exposed adhesive layer is measured by an optical interference microscope (Veeco). The measurement was performed using the product name "Surface shape measuring device WYKO NT110"). The results are shown in Table 1. In addition, the ratio (%) based on the depth measured in Comparative Example 1 was calculated, and the results are also shown in Table 1.

Further, the load was changed to 443 g, and the same measurement as above was performed. Table 1 also shows the depth of the dents (μm) obtained thereby and the ratio (%) based on the depth measured in Comparative Example 1.

(2) About Example 3, Example 4 and Comparative Example 1 Glass in which the laminated sheets of Example 3, Example 4 and Comparative Example 1 are horizontally installed so that the surface on the first film side faces up. It was fixed on the board. Then, a point load of 225 g or 443 g was applied to the surface of the laminated sheet on the first film side in the same manner as in (1) above.

After 5 minutes have passed from the application of the above point load, the first film is peeled off from the laminated sheet, and the depth (μm) of the dents remaining on the exposed surface of the exposed light diffusion control film is measured with an optical interference microscope (Veco). The measurement was performed using the product name "Surface shape measuring device WYKO NT110") manufactured by the company. The results are shown in Table 1. In addition, the ratio (%) based on the depth measured in Comparative Example 1 was calculated, and the results are also shown in Table 1.

(3) About Example 5 and Comparative Example 2 Regarding the laminated sheets of Example 5 and Comparative Example 2, the depth of dents (μm) generated by applying a point load of 225 g or 443 g in the same manner as in (1) above. ) Was measured. Further, the ratio (%) based on the depth measured in Comparative Example 2 was also calculated. These results are shown in Table 2.

(4) About Example 6 and Comparative Example 2 Regarding the laminated sheets of Example 6 and Comparative Example 2, the depth of dents (μm) generated by applying a point load of 225 g or 443 g in the same manner as in (2) above. ) Was measured. Further, the ratio (%) based on the depth measured in Comparative Example 2 was also calculated. These results are shown in Table 2.

As is clear from Tables 1 and 2, in the laminated sheet according to the example, the depth of the generated dents could be satisfactorily reduced even when a point load was applied. From this result, it is presumed that the occurrence of dents can be satisfactorily suppressed even when foreign matter is pinched in the rolled body of the laminated sheet according to the embodiment.

The roll body of the laminated sheet of the present invention is suitably used for manufacturing an apparatus or the like provided with a light diffusion control film.

1 ... Laminated sheet 11a ... First film 11b ... Second film 12 ... Light diffusion control film 13 ... Adhesive layer

Claims (8)

With the first film
A light diffusion control film laminated on one side of the first film and having an internal structure having a plurality of regions having a relatively high refractive index in a region having a relatively low refractive index in the film.
A roll body formed by winding a laminated sheet including a second film laminated on a surface side opposite to the first film in the light diffusion control film.
A roll body of a laminated sheet, characterized in that the thickness of at least one of the first film and the second film is 45 μm or more. The roll body of the laminated sheet according to claim 1, further comprising an adhesive layer provided between the light diffusion control film and the second film. The roll body of the laminated sheet according to claim 2, wherein the thickness of the pressure-sensitive adhesive layer is 1 μm or more and 1000 μm or less. The roll body of the laminated sheet according to claim 2 or 3, wherein the storage elastic modulus of the pressure-sensitive adhesive layer at 23 ° C. is 0.01 MPa or more and 50 MPa or less. The roll body of the laminated sheet according to any one of claims 1 to 4, wherein the thickness of the first film and the second film is 45 μm or more. The lamination according to any one of claims 1 to 5, wherein at least one of the first film and the second film is a release sheet obtained by peeling the surface on the light diffusion control film side. Roll body of the sheet. The roll body of the laminated sheet according to any one of claims 1 to 6, wherein the indentation elastic modulus of the light diffusion control film at 23 ° C. is 1 MPa or more and 5000 MPa or less. The roll body of the laminated sheet according to claim 1 to 7, wherein the thickness of the light diffusion control film is 20 μm or more and 700 μm or less.

Images