KR20200115065A - Roll body of laminated sheet - Google Patents

Abstract

The present invention provides a roll body of laminated sheet capable of suppressing an occurrence of scratches on a light diffusion control film. The roll body is obtained by winding the laminate sheet around, in which the laminate sheet comprises: a first film; a light diffusion control film laminated on one surface side of the first film and having an internal structure provided with a plurality of areas having a relatively high refractive index out of the areas having a relatively low refractive index; and a second film laminated on the opposite surface side of the first film in the light diffusion control film, in which a thickness of at least one of the first film and the second film is 45 μm or more.

Description

Roll body of laminated sheet {ROLL BODY OF LAMINATED SHEET}

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

In the field of optical technology to which a liquid crystal display device, an organic light emitting device, or the like belongs, the use of a light diffusion control film capable of strongly diffusing incident light from a specific angular range in a specific direction is being studied.

As an example of such a light diffusion control film, among regions having a relatively low refractive index, there is a film having an internal structure including a plurality of regions having a relatively high refractive index. More specifically, a light diffusion control film having a louver structure formed by alternately arranging a plurality of plate-like regions having different refractive indices along an arbitrary direction along the film surface, or a relatively high refractive index among regions having a relatively low refractive index. There is a light diffusion control film or the like having a columnar structure formed by placing a plurality of columnar objects.

As the light diffusion control film as described above, in Patent Document 1, a light diffusion control film containing 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 formed by curing a resin composition for use is disclosed.

Patent Document 1: Japanese Patent No. 6414883

By the way, in the case of manufacturing, conveyance, storage, etc., the light diffusion control film has a problem that dents are liable to occur. Particularly, in the case of carrying out, storage, etc. in a state in which the light diffusion control film is wound up and formed into a roll body, foreign matter is easily caught between the light diffusion control films, and as a result, dents are likely to occur. In particular, the roll body may be stored for a long period of time in a state in which the foreign matter is pressed against the light diffusion control film, whereby a strong dent may be left.

The present invention has been made in view of such a reality, and an object of the present invention is to provide a roll 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, the first aspect of the present invention provides a first film, a plurality of regions having a relatively high refractive index among regions having a relatively low refractive index in the film, laminated on one side of the first film. A roll body formed by winding a laminated sheet comprising a light diffusion control film having an internal structure and a second film laminated on a side opposite to the first film in the light diffusion control film, wherein the first film and A roll body of a laminated sheet, characterized in that at least one thickness of the second film is 45 μm or more is provided (Invention 1).

In the roll body of the laminated sheet according to the invention (invention 1), at least one of the first film and the second film laminated on the light diffusion control film has the above-described thickness, and even when foreign matter is caught in the roll body , The occurrence of dents in the light diffusion control film can be favorably suppressed.

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

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

In the above invention (Invention 2 and 3), it is preferable that the storage modulus of the pressure-sensitive adhesive layer at 23° C. is 0.01 MPa or more and 50 MPa or less (Invention 4).

In the above inventions (Inventions 1 to 4), it is preferable that the thickness of the first film and the second film is 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 treatment on the surface of the light diffusion control film side (invention 6).

In the above inventions (Inventions 1 to 6), it is preferable that the light diffusion control film has a press-fit elastic modulus at 23° C. of 1 MPa or more and 5000 MPa or less (Invention 7).

In the above inventions (Inventions 1 to 7), it is preferable that the thickness of the light diffusion control film is 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 occurrence of dents is suppressed.

1 is a cross-sectional view of a laminated sheet constituting a roll body according to an embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described.

1 is 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 is the first film 11a, the light diffusion control film 12 laminated on one side of the first film 11a, and the first light diffusion control film 12 The pressure-sensitive adhesive layer 13 laminated on the side opposite to the film 11a, and the second film 11b laminated on the side opposite to the light diffusion control film 12 in the pressure-sensitive adhesive layer 13 Equipped. The roll body according to this embodiment is formed by winding up the laminated sheet 1 having such a layered configuration. Further, in the roll body according to the present embodiment, the pressure-sensitive adhesive layer 13 described above is not essential and may be omitted.

1. Constituent members of the roll body of the laminated sheet

(1) first film and second film

In the laminated sheet 1 in this embodiment, the thickness of at least one of the first film 11a and the second film 11b is 45 μm or more. Accordingly, in the roll body according to the present embodiment, even when a foreign material is inserted, the influence of the foreign material on the light diffusion control film 12 is at least of the first film 11a and the second film 11b. Suppressed by one side. As a result, the occurrence of dents in 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, for example, it may be 1000 μm or less, particularly 500 μm or less, and may be 200 μm or less.

In addition, in the roll body according to the present embodiment, even if only one thickness of the first film 11a and the second film 11b is 45 μm or more, and the other thickness is less than 45 μm, the film has a thickness of 45 μm or more. Thereby, the influence of foreign matter can be sufficiently suppressed. 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 matters can be suppressed by these two films, thereby better suppressing the occurrence of dents. I can.

As long as the first film 11a and the second film 11b satisfies the condition of the above-described thickness in the first film 11a and the second film 11b, these configurations and materials are particularly limited. It doesn't work. For example, such a film may be a desired base material or a release sheet described later. Further, such a film 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. Moreover, the structure and material of the 1st film 11a and the 2nd film 11b may be the same or different.

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

Specific examples of the case where the first film 11a or the second film 11b is made of a paper-based material include paper substrates such as glassine paper, coated paper, and high-quality paper, and polyethylene for the above paper substrate. Laminate paper obtained by laminating a thermoplastic resin is mentioned.

At least one of the first film 11a and the second film 11b is on one surface (preferably, the surface on the side of the light diffusion control film 12) of the above-described resin-based sheet or a sheet made of a paper-based material. It may be a release sheet obtained by performing a release treatment. 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 according to the present embodiment has an internal structure including a plurality of regions having a relatively high refractive index among regions having a relatively low refractive index in the film. In addition, it is preferable that the light diffusion control film 12 in this embodiment has an internal structure provided so as to extend a plurality of regions having a relatively high refractive index among regions having a relatively low refractive index in the film in the thickness direction.

An example of the internal structure may be a column structure formed by placing a plurality of columnar objects having a relatively high refractive index in the film thickness direction in a region having a relatively low refractive index. In addition, as another example, a louver structure formed by alternately arranging a plurality of plate-like regions having different refractive indices in an arbitrary direction along the film surface may be mentioned.

(2-1) Configuration of light diffusion control film

The specific configuration and composition of the light diffusion control film 12 in this embodiment are not particularly limited, and a conventionally known one can be used. Examples of a preferred light diffusion control film 12 include a high refractive index component having one or two polymerizable functional groups, and a low refractive index having one or two polymerizable functional groups while having a lower refractive index than the high refractive index component. What is formed by hardening the composition for light diffusion control films containing a component is mentioned. By using such a high refractive index component and a low refractive index component, it becomes easy to form the above-described internal structure satisfactorily.

Preferred examples of the high refractive index component include (meth)acrylic acid esters containing an aromatic ring, and particularly preferably (meth)acrylic acid esters containing a plurality of aromatic rings. Examples of the (meth)acrylic acid ester containing a plurality of aromatic rings include (meth) acrylate biphenyl, (meth) acrylate naphthyl, (meth) acrylate anthracyl, (meth) benzyl phenyl acrylate, and (meth) acrylate biphenyl Oxyalkyl, (meth)acrylic acid naphthyloxyalkyl, (meth)acrylate anthraceloxyalkyl, (meth)acrylate benzylphenyloxyalkyl, etc., and the like, in which some of these are substituted with halogen, alkyl, alkoxy, alkyl halide, etc. I can. Among these, from the viewpoint of easy formation of a good internal structure, biphenyl (meth)acrylate is preferred, and specifically, o-phenyl phenoxyethyl acrylate, o-phenyl phenoxy ethoxyethyl acrylate, and the like are preferred. Do. In addition, in this specification, (meth)acrylic acid means both acrylic acid and methacrylic acid. The same goes for 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. In addition, 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. In addition, the weight average molecular weight in this specification is a standard polystyrene conversion value measured according to a gel permeation chromatography (GPC) method.

The refractive index of the high refractive index component is preferably 1.45 or higher, more preferably 1.50 or higher, particularly preferably 1.54 or higher, and further preferably 1.56 or higher. In addition, 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 within the above range, it becomes easy to form the light diffusion control film 12 having a desired internal structure. In addition, the refractive index in this specification means the refractive index of a predetermined component before curing the composition for light diffusion control films, and the said refractive index is measured according to JISK0062:1992.

The content of the high refractive index component in the composition for light diffusion control films is preferably 25 parts by mass or more, particularly preferably 40 parts by mass or more, and further preferably 50 parts by mass or more with respect to 100 parts by mass of the low refractive index component. In addition, the content of the high refractive index component in the composition for light diffusion control films is preferably 400 parts by mass or less, particularly preferably 300 parts by mass or less, and further preferably 200 parts by mass or less with respect to 100 parts by mass of the low refractive index component. . Since the content of the high refractive index component is within such a range, in the internal structure of the light diffusion control film to be formed, a region derived from a high refractive index component and a region derived from a low refractive index component exist in a desired ratio, and as a result, light It becomes easy for the diffusion control film to achieve the desired light diffusivity.

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

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

Preferred examples of the above-described (a) compound containing at least two isocyanate groups include 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 1,3-xylylene diisocyanate, and 1,4- Aromatic polyisocyanates such as xylylene diisocyanate, aliphatic polyisocyanates such as hexamethylene diisocyanate, isophorone diisocyanate (IPDI), alicyclic polyisocyanates such as hydrogenated diphenylmethane diisocyanate, and biurets thereof, iso An adduct body (e.g., a xylylene diisocyanate trifunctional compound) that is a reaction product of a cyanurate body and a compound containing low molecular weight active hydrogen such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane, castor oil, etc. Adduct body), etc. are mentioned. Among these, an alicyclic polyisocyanate is preferable, and an alicyclic diisocyanate containing only two isocyanate groups is particularly preferable.

Preferred examples of the above-described (b) polyalkylene glycol include polyethylene glycol, polypropylene glycol, polybutylene glycol, and polyhexylene glycol, and among them, polypropylene glycol is preferable.

Further, (b) the weight average molecular weight of the polyalkylene glycol is preferably 2300 or more, particularly preferably 4300 or more, and further preferably 6300 or more. In addition, (b) the weight average molecular weight of the polyalkylene glycol is preferably 19500 or less, particularly preferably 14300 or less, and further preferably 12300 or less.

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

Synthesis of urethane (meth)acrylate using the components (a) to (c) described above as a material can be performed according to a conventional method. At this time, the blending ratio of the components (a) to (c) is a molar ratio, from the viewpoint of efficiently synthesizing urethane (meth)acrylate, (a) component: (b) component: (c) component = 1 to It is preferable to set it as a ratio of 5:1:1-5, especially it is preferable to set it as a ratio of 1-3:1:1-3, and it is preferable to set it as a 2:1:2 ratio.

The weight average molecular weight of the low refractive index component is preferably 3000 or more, particularly preferably 5000 or more, and more preferably 7000 or more. In addition, 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. By being in the above range of the weight average molecular weight of the low refractive index component, it becomes easy to form the light diffusion control film 12 having a 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. In addition, 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 within the above range, it becomes easy to form a desired light diffusion control film.

In addition to the high refractive index component and the low refractive index component, the composition for light diffusion control films described above may contain other additives. Other additives include, for example, a polyfunctional monomer (a compound having 3 or more polymerizable functional groups), a photopolymerization initiator, an antioxidant, an ultraviolet absorber, an antistatic agent, a polymerization accelerator, a polymerization inhibitor, an infrared absorber, a plasticizer, a dilution agent. A solvent, and a leveling agent, etc. are mentioned.

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

Moreover, it is also preferable that the composition for light diffusion control films contains a photoinitiator. Since the composition for light diffusion control films contains a photoinitiator, it becomes easy to efficiently form a light diffusion control film having a desired internal structure.

Examples of the photopolymerization initiator include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylamino acetophenone, 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-morpholinopropan-1-one, 4-(2-hydroxyethoxy)phenyl-2-(hydroxy-2-propyl) ketone, Benzophenone, p-phenylbenzophenone, 4,4-diethylamino benzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tertiarybutylanthraquinone, 2-aminoanthraquinone, 2 -Methyl thioxanthone, 2-ethyl thioxanthone, 2-chloro thioxanthone, 2,4-dimethyl thioxanthone, 2,4-diethyl thioxanthone, benzyl dimethyl ketal, acetophenone dimethyl ketal, p- Dimethylaminobenzoic 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 types.

When a photoinitiator is used, the content of the photoinitiator in the composition for a light diffusion control film is preferably 0.2 parts by mass or more, particularly 0.5 parts by mass or more with respect to 100 parts by mass of the total amount of the high refractive index component and the low refractive index component. It is preferable to set it as, and it is preferable to set it as 1 mass part or more. In addition, the content of the photopolymerization initiator is preferably 20 parts by mass or less, particularly preferably 15 parts by mass or less, and further 10 parts by mass or less with respect to 100 parts by mass of the total amount of the high refractive index component and the low refractive index component. It is desirable to do. By setting the content of the photoinitiator in the composition for light diffusion control films in the above range, it becomes easy to form the light diffusion control film 12 efficiently.

The composition for light diffusion control films can be adjusted by uniformly mixing the above-described high refractive index component and low refractive index component, and other additives as desired. At the time of mixing, it may stir while heating at a temperature of 40-80 degreeC, and you may obtain a uniform composition for light diffusion control films. Moreover, you may add and mix a diluting solvent so that the composition for light diffusion control films obtained may become a desired viscosity.

(2-2) Indentation modulus of light diffusion control film

As the lower limit, the indentation modulus of the light diffusion control film 12 in the present embodiment at 23° C. is preferably 1 MPa or more, particularly preferably 10 MPa or more, and further preferably 20 MPa or more. When the lower limit of the press-in 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. Further, the indentation modulus is preferably 5000 MPa or less as an upper limit, more preferably 1000 MPa or less, particularly preferably 300 MPa or less, and further preferably 40 MPa or less. When the upper limit of the press-in elastic modulus is in the above range, the light diffusion control film 12 has appropriate flexibility, and the light diffusion control film 12 tends to have a desired handling property. In addition, the details of the method of measuring the indentation modulus are as described in Examples to be described later.

(2-3) Thickness of the light diffusion control film

The thickness of the light diffusion control film 12 in this embodiment is preferably 20 μm or more, particularly preferably 40 μm or more, and further preferably 60 μm or more as a lower limit. When the lower limit of the thickness of the light diffusion control film 12 is in the above range, it becomes easy to exhibit desired light diffusivity. Further, the thickness of the light diffusion control film 12 is preferably 700 μm or less as an upper limit, 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) Ratio of the internal structure in the thickness direction of the light diffusion control film

As described above, the light diffusion control film 12 in the present embodiment preferably has an internal structure provided so as to extend a plurality of regions having a relatively high refractive index among regions having a relatively low refractive index in the film. Do. Here, as the ratio extending in the thickness direction of the internal structure, from the viewpoint of making light diffusibility more efficient, it is preferable that it is 10% or more of the thickness of the light diffusion control film 12, more preferably 30% or more, It is particularly preferably 50% or more. In addition, the upper limit is not limited, and the internal structure may be formed at 100%, that is, both in the thickness direction.

(3) adhesive layer

The laminated sheet in this embodiment may be provided with the pressure-sensitive adhesive layer 13. By providing the pressure-sensitive adhesive layer 13, it becomes easy to fix the light diffusion control film 12 supplied from the roll body according to the present embodiment to a desired member via the pressure-sensitive adhesive layer 13. In addition, in the roll body according to the present embodiment, as described above, the first film 11a and the second film 11b satisfy the above-described thickness condition, so that the occurrence of dents is suppressed. For this reason, it is not necessary to provide the pressure-sensitive adhesive layer 13 from the viewpoint of suppressing the occurrence of dents.

The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 13 is not particularly limited as long as it has a desired adhesiveness and does not impair the effect of suppressing the occurrence of dents, and a conventionally known one can be used. For example, as the pressure-sensitive adhesive, acrylic pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, and the like can be used, and among them, acrylic pressure-sensitive adhesives that are easy to achieve good adhesion and transparency are preferred.

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

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

Examples of the carboxyl group-containing monomer include ethylenically unsaturated carboxylic acids such as acrylic acid and methacrylic acid. Among these, acrylic acid is preferable. Further, preferable examples of the hydroxy group-containing monomer include 2-hydroxyethyl (meth)acrylate and 4-hydroxybutyl (meth)acrylate. 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. Moreover, it is preferable that the said polymer contains 40 mass% or less of said structural units, and it is especially preferable to contain 20 mass% or less.

The (meth)acrylic acid ester polymer is also preferably containing an alkyl (meth)acrylate as a monomer unit constituting the polymer from the viewpoint of expressing adhesion, and in particular, an alkyl acrylate having 1 to 18 carbon atoms in the alkyl group is used. It is preferable to use. As a specific example, methyl (meth)acrylate, n-butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, etc. are mentioned. These may be used alone or in combination of two or more.

The (meth)acrylic acid ester polymer preferably contains 50% by mass or more, and particularly 80% by mass or more of the structural unit derived from the (meth)acrylic acid alkyl ester from the viewpoint of both adhesion and storage modulus. desirable. Moreover, it is preferable that the said polymer contains the said structural unit in 99 mass% or less, and it is especially preferable to contain 95 mass% or less.

The (meth)acrylic acid ester polymer may be one obtained by copolymerization of other monomers together with the functional group-containing monomer and the (meth)acrylate alkyl ester described above. Moreover, about the polymerization form of the said polymer, a random copolymer may be sufficient and a block copolymer may be sufficient. Moreover, the said polymer may be used individually by 1 type, and may be used in combination of 2 or more types.

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 modulus suitable. Further, the weight average molecular weight is preferably 2.5 million or less, and particularly preferably 2 million or less.

As the crosslinking agent, any one that reacts with the reactive functional group possessed by the (meth)acrylic acid ester polymer may be used. For example, an epoxy crosslinking agent, an isocyanate crosslinking agent, or the like is preferably used. In addition, the crosslinking agent can be used alone or in combination of two or more.

The content of the crosslinking agent in the adhesive composition is preferably 0.01 parts by mass or more, and particularly preferably 0.1 parts by mass or more with respect to 100 parts by mass of the (meth)acrylic acid ester polymer. In addition, the content is preferably 10 parts by mass or less, and particularly preferably 5 parts by mass or less.

In the adhesive composition, as desired, various additives commonly used in acrylic adhesives, such as active energy ray-curable components, photopolymerization initiators, silane coupling agents, antistatic agents, tackifiers, antioxidants, light stabilizers, softeners, fillers And a refractive index modifier or the like can be added.

When the adhesive composition contains an active energy ray-curable component, an adhesive layer 13 composed of an active energy ray-curable 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 one of a monomer, an oligomer, or a polymer, or a mixture thereof. Among them, a polyfunctional acrylate-based monomer excellent in compatibility with a (meth)acrylic acid ester copolymer or the like is preferably mentioned. In addition, the storage modulus of the pressure-sensitive adhesive obtained by using an active energy ray-curable component can be slightly increased.

The adhesive composition can be prepared by preparing a (meth)acrylic acid ester polymer, and mixing the obtained (meth)acrylic acid ester polymer, a crosslinking agent, and an additive as desired. The (meth)acrylic acid ester polymer can be produced by polymerizing a mixture of monomers constituting the polymer by a conventional radical polymerization method. The polymerization of the (meth)acrylic acid ester polymer is preferably carried out according to a solution polymerization method using a polymerization initiator as desired. The adhesive composition may be prepared as a coating solution of the adhesive composition by adding a diluted solvent and mixing sufficiently.

The storage modulus at 23°C of the pressure-sensitive adhesive layer 13 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 preferably 0.40 MPa or more. Further, the storage 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. Since the storage elastic modulus at 23°C of the pressure-sensitive adhesive layer 13 is within the above range, the influence of foreign matters caught in the roll body is easily reduced by the pressure-sensitive adhesive layer 13 while securing the adhesive force. In particular, since the storage elastic modulus is 0.01 MPa or more, it becomes easy to exert an effect on removing dents from the first film side (a film laminated on the side not in contact with the pressure-sensitive adhesive layer in the light diffusion control film). Thereby, the occurrence of dents in the light diffusion control film 12 can be more effectively suppressed. In addition, the storage modulus of the pressure-sensitive adhesive layer 13 at 23° C. means the pressure-sensitive adhesive layer 13 after curing by irradiation with active energy rays when the pressure-sensitive adhesive layer 13 is made of the aforementioned active energy ray-curable adhesive. It shall refer to the storage modulus of In addition, the details of the method for measuring the storage 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. Further, 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, it becomes easy to exhibit desired adhesion.

(4) others

The laminated sheet 1 in this embodiment may have a layer other than the above-described layer as long as it does not impair the effect of suppressing dents. Further, the roll body according to the present embodiment may be formed by winding the laminated sheet 1 around a core material.

As the said winding core, it does not specifically limit as long as it can wind up the laminated sheet 1 in this embodiment, A well-known thing can be used. The material constituting the core material preferably has sufficient strength for winding the laminated sheet 1, and examples thereof include resin, metal, wood, and the like.

2. Manufacturing method of roll body of laminated sheet

The method for manufacturing the roll body of the laminated sheet according to the present embodiment is not particularly limited, and a conventionally known method can be employed.

As an example, after obtaining a laminate (first laminate) formed by laminating the first film 11a and the light diffusion control film 12, the light diffusion control film 12 in the first laminate About the side surface, the 2nd film 11b is pasted. Lamination according to this embodiment by winding up the laminated sheet 1 obtained by laminating the first film 11a, the light diffusion control film 12, and the second film 11b obtained thereby in this order A roll body of a sheet can be obtained.

In addition, a laminate obtained by laminating a second film 11b and an adhesive layer 13 together with a laminate (first laminate) obtained by laminating the first film 11a and the light diffusion control film 12 (2nd layered product) is prepared. And the surface on the side of the light diffusion control film 12 in the first layered product and the surface on the side of the pressure-sensitive adhesive layer 13 in the second layered product are bonded together. This implementation is carried out by winding up 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. It is possible to obtain a roll body of a laminated sheet according to the shape.

The method for manufacturing a laminate (first laminate) obtained by laminating the first film 11a and the light diffusion control film 12 described above is not particularly limited, and can be produced according to a conventionally known method. For example, after applying the composition for a light diffusion control film to one side of the process sheet to form a coating film, on the side opposite to the process sheet in the coating film, one of the first films 11a Put the noodles together. Subsequently, the light diffusion control film 12 is formed by irradiating and curing the coating film with an active energy ray beyond the first film 11a. In this way, by laminating the first film 11a on the coating film, the gap between the first film 11a and the process sheet is maintained, the coating film is prevented from being pressed and destroyed, and the light diffusion control film 12 having a uniform thickness. ) Becomes easier to form. By forming the light diffusion control film 12 as described above, the first layered product consisting of the first film 11a and the light diffusion control film 12 is placed on the surface of the light diffusion control film 12 as a process film. You can get it with the

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, you may dilute the composition for light diffusion control films using a solvent as needed.

The active energy ray irradiation to the coating film is performed in different forms depending on the internal structure to be formed. Such irradiation can be performed according to a conventionally known method. For example, in the case of forming the column structure described above, parallel light having a high degree of parallelism of light rays is irradiated to the coating film. On the other hand, in the case of forming the above-described louver structure, a linear light source is used as a light source of active energy rays, and a band-like band ( Almost on board).

In addition, the active energy ray refers to a substance having an energy quantum in an electromagnetic wave or a charged particle ray, and specifically, an ultraviolet ray, an electron beam, and the like are exemplified. Among the active energy rays, ultraviolet rays that are easy to handle are particularly preferred.

When forming a column structure using ultraviolet rays as an active energy ray, the irradiation condition is preferably 0.1 to 10 mW/cm 2 of peak roughness on the surface of the coating film. Incidentally, the peak roughness referred to herein means a measured value at a portion where the active energy ray irradiated to the surface of the coating film exhibits a maximum value. In addition, it is preferable to set the accumulated light amount on the surface of the coating film to 5 to 200 mJ/cm 2.

When forming a louver structure using ultraviolet rays as an active energy ray, the irradiation condition is preferably that the peak roughness on the surface of the coating film is 0.1 to 50 mW/cm 2 or less. Moreover, it is preferable that the accumulated light quantity on the surface of the coating film is 5 to 300 mJ/cm 2 or less.

In addition, from the viewpoint of completing curing more reliably, after curing using the above-described parallel light or band-shaped light, an ordinary active energy ray (active energy ray that has not been subjected to a process for converting to parallel light or band-shaped light, It is also preferable to irradiate scattered light).

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

By winding the laminated sheet 1 produced as described above, a roll body of the laminated sheet is obtained. At this time, the laminated sheet 1 may be wound about the above-described core material. Further, the above-described first layered product (and second layered product) may be manufactured, the layered sheet 1 may be formed, and the formed layered sheet 1 may be continuously wound. For example, while manufacturing a first laminate and a second laminate upstream in the flow direction, the obtained first laminate and the second laminate are laminated downstream in the flow direction, The laminated sheet 1 thus obtained may be further wound to obtain a roll body.

3. Use of roll body of laminated sheet

The roll body of the laminated sheet according to the present embodiment can be used to provide the light diffusion control film 12. For example, the laminated sheet 1 is continuously sent out from the roll body, cut into a desired shape, the first film 11a and the second film 11b are peeled at a desired timing, and then cut into a desired shape. The resulting light diffusion control film 12 (when the laminated sheet 1 is provided with the pressure sensitive adhesive layer 13, a laminate 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 preferably used in order to manufacture a liquid crystal display device, an organic light emitting device, an electronic paper, or 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. For this reason, in the light diffusion control film 12 provided from the roll body according to the present embodiment, the performance of light diffusion is not impaired. And, by using such a light diffusion control film, it becomes possible to manufacture a device having a desired performance.

Embodiments described above are described to facilitate understanding of the present invention, and are not described to limit the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents falling within the technical scope of the present invention.

Example

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

[Example 1]

(1) Formation of light diffusion control film

With respect to 40 parts by 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 a low refractive index component (in terms of solid content; hereinafter the same) , After adding 60 parts by mass of o-phenyl phenoxy ethoxyethyl acrylate having a molecular weight of 268 as a high refractive index component and 8 parts by mass of 2-hydroxy-2-methyl-1-phenylpropan-1-one as a photopolymerization initiator, Heat mixing was performed under 80 degreeC conditions, and the composition for light diffusion control films was obtained.

The obtained composition for light diffusion control films was applied to one side of a long polyethylene terephthalate sheet as a process sheet to form a coating film. Subsequently, on the side opposite to the process sheet in the coating film, a release sheet obtained by peeling one side of a polyethylene terephthalate film as a first film with a silicone release agent (manufactured by Lintec Corporation, product name ``SP-PET381130'', thickness : 38 μm) of the peeling surface was laminated.

The laminated body obtained by this, comprising the first film, the coating film, and the process sheet was placed on a conveyor. At this time, the surface on the side of the first film in the layered product was set to be the upper side, and the longitudinal direction of the layered product was made parallel to the flow direction of the conveyor. Then, an ultraviolet spot parallel light source (manufactured by JATEC) in which the central ray parallelism was controlled within ±3° was installed on the conveyor on which the laminate 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 laminate. Further, it was installed so that the distance between the surface of the first film and the light source was 240 mm.

Thereafter, the conveyor was operated, while moving the layered product at a speed of 0.2 m/min, parallel light having a parallelism of 2° or less under conditions of a peak illuminance of 2.00 mW/cm 2 and an accumulated light amount of 53.13 mJ/cm 2 on the coating surface. (Ultraviolet rays from a high-pressure mercury lamp having peaks at the main peak wavelength of 365 nm and other 254 nm, 303 nm, and 313 nm) to cure the coating film in the laminate. Thereby, a light diffusion control film having a thickness of 60 μm was formed by curing the above-described coating film. Further, by peeling the process sheet from the laminate, a first laminate obtained by laminating the first film and the light diffusion control film in this order was obtained.

Further, the indentation modulus of the obtained light diffusion control film at 23° C. was measured using an ultra-micro hardness tester (manufactured by Shimadzu Corporation, "Shimadzu Dynamic Ultra Micro Hardness Tester DUH-W201S"), and it was 27 MPa. Further, when microscopic observation of the cross section of the formed light diffusion control film was performed, it was confirmed that a column structure formed by placing a plurality of columnar objects in the entire thickness direction was formed inside the light diffusion control film. That is, the ratio of extending in the thickness direction of the columnar structure region inside the obtained light diffusion control film was 100%. In addition, it was confirmed that the above-described columnar object was inclined by 20° to the side opposite to the advancing direction of the conveyor with respect to the thickness direction of the light diffusion control film (inclination angle -20°). In addition, as for the said inclination angle, the film surface normal direction is set to 0 degrees, and the conveyor traveling direction is expressed as positive, and the opposite direction is expressed as negative.

In addition, the above-described peak illuminance and cumulative amount of light were measured by installing a UVMETER (manufactured by iGrafx, product name "Eye UV illuminance meter UVPF-A1") installed at the position of the coating film. The thickness of the light diffusion control film was measured using a static pressure thickness measuring device (manufactured by TAKARA. Co. Ltd., product name "TECLOCK 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 according to 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 according to the method described later, and it was 400,000.

100 parts by mass of the (meth)acrylic acid ester polymer obtained above and 1,3-bis (N, N'-diglycidylaminomethyl) cyclohexane (manufactured by Mitsubishi Gas Chemical Co., Inc., product name “TETRAD-” as a crosslinking agent) C") 0.05 part by mass was mixed in a solvent, and the coating liquid of the adhesive composition was obtained.

Subsequently, peeling of a release sheet (manufactured by Lintec Corporation, product name "SP-PET752150", thickness: 75 μm) obtained by peeling off one side of a polyethylene terephthalate film as a second film with a silicone release agent. It applied on the surface and heated at 90 degreeC for 1 minute, and the 25 micrometers-thick adhesive layer was formed on the 2nd film. Thereby, a 2nd laminated body formed by laminating a 2nd film and a pressure-sensitive adhesive layer was obtained.

Further, the storage modulus at 23° C. of the formed pressure-sensitive adhesive layer was measured by Test Example 1 described later, and it was 0.16 MPa. In addition, the above-described thickness of the pressure-sensitive adhesive layer is a value measured using a static pressure thickness meter (manufactured by TECLOCK, product name "PG-02") in accordance with JIS K7130.

(3) formation of laminated sheet

After bonding the surface on the side of the light diffusion control film in the first layered product obtained in the step (1) and the surface on the side of the pressure-sensitive adhesive layer in the second layered product obtained in the step (2), the temperature is 23°C, By performing seasoning for 168 hours in an environment of 50% relative humidity, a laminated sheet obtained by laminating the first film, the light diffusion control film, the pressure-sensitive adhesive layer, and the second film in this order was obtained.

Here, the above-described weight average molecular weight (Mw) is a weight average molecular weight in terms of standard polystyrene measured under the following conditions (GPC measurement) using gel permeation chromatography (GPC).

<Measurement conditions>

·Measurement device: manufactured by TOSOH CORPORATION, HLC-8320

GPC column (pass through in the following order): manufactured by TOSOH CORPORATION

TSK gel superH-H

TSK gel superHM-H

TSK gel superH2000

-Measurement solvent: Tetrahydrofuran

·Measurement temperature: 40℃

(Examples 2 to 4, Comparative Example 1)

A laminated sheet was produced in the same manner as in Example 1 except that the thickness of the first film and the second film was 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 were polymerized according to a solution polymerization method to obtain a (meth)acrylic acid ester polymer A having a weight average molecular weight (Mw) of 2 million.

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

In addition, the weight average molecular weight (Mw) of this (meth)acrylic acid ester polymer 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 as an active energy ray-curable component Toagosei Co., Ltd. Agent, product name "ARONIX 315" 15 parts by mass and trimethylolpropane-modified tolylene diisocyanate TOSOH CORPORATION as a crosslinking agent, product name "Coronate L") 1.4 parts by weight) were mixed in a solvent to obtain a coating liquid of the pressure-sensitive adhesive composition.

On the peeling surface of the release sheet obtained by peeling one side of a polyethylene terephthalate film as a second film with a silicone-based release agent (manufactured by Lintec Corporation, product name "SP-PET752150", thickness: 75 μm), the coating liquid of the pressure-sensitive adhesive composition described above Then, after application|coating with the knife type coater, it dried at 90 degreeC for 1 minute, and formed the coating film.

Then, with respect to the side opposite to the second film in the formed coating film, a release sheet obtained by peeling one side of the polyethylene terephthalate film with a silicone release agent (manufactured by LINTEC Corporation, product name "SP-PET382120", thickness: 38 μm. ) Of the peeling surface was bonded together. After 30 minutes after bonding, ultraviolet rays (UV) were irradiated over the second film under the following conditions to form an adhesive layer having a thickness of 15 μm obtained by curing the coating film. Then, by peeling the release sheet (38 μm thick) from the pressure-sensitive adhesive layer, a second laminate obtained by laminating a second film and an adhesive layer was obtained.

<UV irradiation conditions>

·Fusion's electrodeless lamp 　H valve

·Illuminance: 600mW/㎠, Light intensity: 150mJ/㎠

UV illuminance/photometer uses “UVPF-36” manufactured by iGrafx

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

Further, the storage modulus at 23°C of the formed pressure-sensitive adhesive layer was measured by Test Example 1 described later, and it was 0.59 MPa.

(Example 6, Comparative Example 2)

A laminated sheet was 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 the storage modulus of the adhesive layer)

A plurality of layers of the pressure-sensitive adhesive layers after seasoning obtained in Examples and Comparative Examples were laminated to obtain a laminate having a thickness of 3 mm. From the laminate of the obtained pressure-sensitive adhesive layer, a columnar body (3 mm in height) having a diameter of 8 mm was drilled, and this was used as a sample.

For the sample, according to JIS K7244-6, using a viscoelasticity measuring device (manufactured by REOMETRIC, product name "DYNAMIC" ANALAYZER"), according to the torsional shear method, the storage modulus (G') MPa was measured under the following conditions.

Measurement frequency: 1Hz

Measurement temperature: 23℃

[Test Example 2] (Measurement of dents)

(1) About Example 1, Example 2, and Comparative Example 1

The laminated sheets of Example 1, Example 2, and Comparative Example 1 were fixed on a glass plate placed horizontally so that the surface of the second film side was on the top. And, with respect to the surface of the second film side of the laminated sheet, a hardness tester (manufactured by KOBUNSHI KEIKI CO., LTD., product name "ASKER hardness tester C2") in which the tip of the pressure core is a hemisphere with a diameter of 2.54 mm is used. A point load was applied for 10 seconds with a load of 225 g.

After 5 minutes elapsed from the application of the point load, the second film was peeled from the laminated sheet, and the depth (μm) of the dent remaining on the exposed surface of the pressure-sensitive adhesive layer exposed by this was measured by a light interference microscope (manufactured by Veeco, It measured using the product name "surface shape measuring apparatus 　 WYKO 　 NT110"). Table 1 shows the results. In addition, a ratio (%) based on the depth measured in Comparative Example 1 was calculated, and the results are also shown in Table 1.

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

(2) About Example 3, Example 4, and Comparative Example 1

The laminated sheets of Example 3, Example 4, and Comparative Example 1 were fixed on a horizontally installed glass plate so that the surface of the first film side was above. And a point load of 225 g or 443 g was applied to the surface of the laminated sheet on the side of the first film in the same manner as in the above (1).

After 5 minutes have elapsed from the application of the point load, the first film is peeled from the laminated sheet, and the depth (μm) of the dent remaining on the exposed surface of the light diffusion control film exposed by this is determined by a light interference microscope (Veeco). It measured using the 1st product name "surface shape measuring apparatus 　WYKO　NT110"). Table 1 shows the results. In addition, a 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

For the laminated sheets of Example 5 and Comparative Example 2, in the same manner as in (1) above, the depth (μm) of the dents generated by application of a point load of 225 g or 443 g was measured. In addition, a ratio (%) based on the depth measured in Comparative Example 2 was also calculated. Table 2 shows these results.

(4) About Example 6 and Comparative Example 2

For the laminated sheets of Example 6 and Comparative Example 2, in the same manner as in the above (2), the depth (μm) of the dents generated by application of a point load of 225 g or 443 g was measured. In addition, a ratio (%) based on the depth measured in Comparative Example 2 was also calculated. Table 2 shows these results.

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

The roll body of the laminated sheet of the present invention is suitably used for production of devices including a light diffusion control film.

1: Laminated sheet
11a: first film
11b: second film
12: light diffusion control film
13: adhesive layer

Claims (8)

First film,
A light diffusion control film having an internal structure including a plurality of regions having a relatively high refractive index among regions having a relatively low refractive index in the film, which are laminated on one side of the first film, and
A second film laminated on a side opposite to the first film in the light diffusion control film,
As a roll body formed by winding up a laminated sheet having,
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. The method of claim 1,
A roll body of a laminated sheet, comprising: an adhesive layer provided between the light diffusion control film and the second film. The method of claim 2,
The roll body of the laminated sheet, characterized in that the thickness of the pressure-sensitive adhesive layer is 1 μm or more and 1000 μm or less. The method of claim 2,
A roll body of a laminated sheet, wherein the pressure-sensitive adhesive layer has a storage elastic modulus at 23° C. of 0.01 MPa or more and 50 MPa or less. The method of claim 1,
The roll body of the laminated sheet, characterized in that the thickness of the first film and the second film is 45 μm or more. The method of claim 1,
A roll body of a laminated sheet, wherein at least one of the first film and the second film is a release sheet obtained by peeling a surface on the side of the light diffusion control film. The method of claim 1,
The roll body of a laminated sheet, wherein the light diffusion control film has an indentation modulus of 1 MPa or more and 5000 MPa or less at 23°C. The method of claim 1,
The thickness of the light diffusion control film is 20 μm or more and 700 μm or less.

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