WO2015098714A1 - 光学積層体および面光源装置 - Google Patents
光学積層体および面光源装置 Download PDFInfo
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- WO2015098714A1 WO2015098714A1 PCT/JP2014/083618 JP2014083618W WO2015098714A1 WO 2015098714 A1 WO2015098714 A1 WO 2015098714A1 JP 2014083618 W JP2014083618 W JP 2014083618W WO 2015098714 A1 WO2015098714 A1 WO 2015098714A1
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- optical laminate
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- 125000000913 palmityl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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- CXVGEDCSTKKODG-UHFFFAOYSA-N sulisobenzone Chemical compound C1=C(S(O)(=O)=O)C(OC)=CC(O)=C1C(=O)C1=CC=CC=C1 CXVGEDCSTKKODG-UHFFFAOYSA-N 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000010557 suspension polymerization reaction Methods 0.000 description 1
- 229910001936 tantalum oxide Inorganic materials 0.000 description 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 1
- 150000003505 terpenes Chemical class 0.000 description 1
- 235000007586 terpenes Nutrition 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
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- 239000004408 titanium dioxide Substances 0.000 description 1
- RUELTTOHQODFPA-UHFFFAOYSA-N toluene 2,6-diisocyanate Chemical compound CC1=C(N=C=O)C=CC=C1N=C=O RUELTTOHQODFPA-UHFFFAOYSA-N 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- 150000003852 triazoles Chemical class 0.000 description 1
- FRGPKMWIYVTFIQ-UHFFFAOYSA-N triethoxy(3-isocyanatopropyl)silane Chemical compound CCO[Si](OCC)(OCC)CCCN=C=O FRGPKMWIYVTFIQ-UHFFFAOYSA-N 0.000 description 1
- VTHOKNTVYKTUPI-UHFFFAOYSA-N triethoxy-[3-(3-triethoxysilylpropyltetrasulfanyl)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCSSSSCCC[Si](OCC)(OCC)OCC VTHOKNTVYKTUPI-UHFFFAOYSA-N 0.000 description 1
- JXUKBNICSRJFAP-UHFFFAOYSA-N triethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCOCC1CO1 JXUKBNICSRJFAP-UHFFFAOYSA-N 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- JLGLQAWTXXGVEM-UHFFFAOYSA-N triethylene glycol monomethyl ether Chemical compound COCCOCCOCCO JLGLQAWTXXGVEM-UHFFFAOYSA-N 0.000 description 1
- DQZNLOXENNXVAD-UHFFFAOYSA-N trimethoxy-[2-(7-oxabicyclo[4.1.0]heptan-4-yl)ethyl]silane Chemical compound C1C(CC[Si](OC)(OC)OC)CCC2OC21 DQZNLOXENNXVAD-UHFFFAOYSA-N 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
- TZYULTYGSBAILI-UHFFFAOYSA-M trimethyl(prop-2-enyl)azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CC=C TZYULTYGSBAILI-UHFFFAOYSA-M 0.000 description 1
- SOLUNJPVPZJLOM-UHFFFAOYSA-N trizinc;distiborate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-][Sb]([O-])([O-])=O.[O-][Sb]([O-])([O-])=O SOLUNJPVPZJLOM-UHFFFAOYSA-N 0.000 description 1
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- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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Definitions
- the present invention relates to an optical laminate and a surface light source device.
- a surface light source device including an organic electroluminescence element (hereinafter, appropriately referred to as “organic EL element”) is configured, a surface light emitter including the organic EL element and light extraction provided on the light emitting surface of the surface light emitter.
- a film (a film having a concavo-convex structure on the surface for improving light extraction efficiency) may be laminated via an adhesive layer.
- the adhesive layer has a high refractive index, it is particularly advantageous in increasing the light extraction efficiency.
- an inorganic oxide which is a high refractive index material
- Patent Document 1 it is possible to realize an adhesive layer having a high refractive index by adding an inorganic oxide having a high refractive index to an adhesive (resin). If the compatibility with the adhesive is not good, it may be gelled and cannot be used. In addition, even when an adhesive having high compatibility with the inorganic oxide is used, increasing the amount of the inorganic oxide added to increase the refractive index reduces the adhesive strength. May not be able to exhibit the function of, and may be inferior in practicality. For this reason, the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer is required to have a high refractive index and sufficient adhesiveness. By laminating the base material on the light emitting surface made of glass through such an adhesive, light emitted from the light emitting element can be efficiently extracted.
- the present invention has been made in view of the above-mentioned problems, and is capable of achieving a high refractive index and is composed of a light emitting material made of glass by forming an adhesive layer using an adhesive having sufficient adhesiveness.
- An optical laminate that can more efficiently extract light from a light emitting element having a surface, and a surface light source device including the optical laminate.
- the present inventor has solved the problem by using a specific acrylic pressure-sensitive adhesive composition and configuring the refractive index of each layer to satisfy a specific relationship. As a result, the present invention was completed. According to the present invention, the following ⁇ 1> to ⁇ 14> are provided.
- An optical laminate comprising a base material and an adhesive layer formed on the base material, wherein the adhesive layer side is pasted on a light emitting surface made of glass, and the light emitting surface is
- the refractive index of the constituting glass is n1
- the refractive index of the adhesive layer is n2
- the refractive index of the substrate is n3, and the relationship of n3 ⁇ n2 ⁇ n1 is satisfied
- the adhesive layer is made of an acrylic resin (A
- the acrylic resin (A) contains 40 to 93% by weight of the aromatic ring-containing monomer (a1) and 7 to 60% by weight of the hydroxyl group-containing monomer (a2).
- An optical laminate which is a copolymer of copolymer component [I] and has a weight average molecular weight of 200,000 or less.
- the inorganic oxide (B) is a particle having a volume average particle diameter of 5 nm to 50 nm, and the acrylic pressure-sensitive adhesive composition contains the inorganic oxide (100 parts by weight with respect to 100 parts by weight of the acrylic resin).
- ⁇ 4> The optical laminate according to any one of ⁇ 1> to ⁇ 3>, wherein the acrylic pressure-sensitive adhesive composition contains a crosslinking agent (C).
- C crosslinking agent
- ⁇ 5> The optical laminate according to any one of ⁇ 1> to ⁇ 4>, wherein the acrylic pressure-sensitive adhesive composition contains a plasticizer (D).
- ⁇ 6> The optical laminate according to ⁇ 5>, wherein the acrylic pressure-sensitive adhesive composition contains 5 to 20 parts by weight of the plasticizer (D) with respect to 100 parts by weight of the acrylic resin (A).
- ⁇ 7> The optical laminate according to ⁇ 5> or ⁇ 6>, wherein the plasticizer (D) has a melting point of 0 ° C. or lower.
- ⁇ 8> The optical laminate according to any one of ⁇ 5> to ⁇ 7>, wherein the plasticizer (D) is selected from the group consisting of ester plasticizers.
- the plasticizer (D) is a benzoic acid ester.
- ⁇ 10> The optical element according to any one of ⁇ 1> to ⁇ 9>, wherein a difference (n3 ⁇ n2) between a refractive index n3 of the substrate and a refractive index n2 of the adhesive layer is 0.02 or less.
- ⁇ 11> The optical laminate according to any one of ⁇ 1> to ⁇ 10>, wherein the difference (n2 ⁇ n1) between the refractive index n2 of the adhesive layer and the refractive index n1 of the glass is 0.02 or less. body.
- ⁇ 12> The optical laminate according to any one of ⁇ 1> to ⁇ 11>, wherein the adhesive layer has a refractive index n2 of 1.53 or more.
- ⁇ 13> The optical laminate according to any one of ⁇ 1> to ⁇ 12>, further comprising an uneven structure layer formed on the substrate.
- ⁇ 14> a surface light emitter having a light emitting surface made of glass, and the optical laminate according to any one of ⁇ 1> to ⁇ 13>, wherein the adhesive layer is attached to the light emitting surface. , Surface light source device.
- the optical layered body of the present invention it is possible to increase the refractive index and to form an adhesive layer using an adhesive having sufficient adhesiveness so that the refractive index of each layer satisfies a specific relationship.
- an adhesive having sufficient adhesiveness so that the refractive index of each layer satisfies a specific relationship.
- solvent is used for convenience of description to describe not only a medium constituting a solution in which a solute is dissolved, but also a suspension (slurry) in which a dispersion is dispersed. (Including the medium that constitutes).
- “compatible” between a substance and another substance means that when these substances are mixed with a solvent as necessary to form a solution or suspension, they are gelated or separated. The property of maintaining a homogeneous state without causing any.
- (meth) acryl is a term including acryl and methacryl
- (meth) acryloyl is a term including acryloyl and methacryloyl
- (meth) acrylate is acrylate and methacrylate.
- acrylic resin means a resin obtained by polymerizing a monomer component containing at least one (meth) acrylic monomer.
- optical laminated body of this invention is equipped with a base material and the adhesion layer formed on a base material.
- the optical laminate is formed into a sheet or film.
- ⁇ Base material> Although it does not specifically limit as a material which comprises a base material, Since it is laminated
- the resin composition containing can be used. That the transparent resin is “transparent” means having a light transmittance suitable for use as an optical member.
- the pressure-sensitive adhesive layer and the substrate constituting the optical layered body and other layers described later can be appropriately configured so as to have a total light transmittance of 80% or more as the entire optical layered body.
- Glass light-emitting surface is a light-emitting surface of a surface light emitter having a glass layer as the outermost layer that emits light.
- the transparent resin is not particularly limited, and examples thereof include a thermoplastic resin.
- the thermoplastic resin include polyester-based, polyacrylate-based, and cycloolefin polymer-based resins, and in particular, films made of alicyclic olefin polymers (for example, ZEONOR film manufactured by Nippon Zeon Co., Ltd.) A polyester film is preferred.
- the material constituting the substrate include polyester resins such as polyethylene naphthalate, polyethylene terephthalate, boribylene terephthalate, polyethylene terephthalate / isophthalate copolymer; polyethylene, polypropylene, polymethylpentene, and the like.
- Polyolefin resins such as polyvinyl fluoride, polyvinylidene fluoride, and polyfluorinated ethylene; polyamides such as nylon 6 and nylon 6, 6; polyvinyl chloride, polyvinyl chloride / vinyl acetate copolymer, ethylene Vinyl acetate copolymers, ethylene-vinyl alcohol copolymers, vinyl polymers such as polyvinyl alcohol and vinylon; cellulose resins such as cellulose triacetate and cellophane; polymethyl methacrylate, polymethacrylic acid Chill, ethyl polyacrylate, acrylic resins such as polybutyl acrylate; polystyrene; polycarbonates; polyarylates; can be mentioned polyimide.
- the base material is the outermost surface of the surface light source device, it is preferable to use a base material having high scratch resistance.
- the base material is made of a resin having a film thickness of 7 ⁇ m.
- a material having a pencil hardness of HB or higher is preferable, a material of H or higher is more preferable, and a material of 2H or higher is more preferable.
- the thickness of the substrate is not particularly limited, but is usually 50 to 100 ⁇ m.
- the refractive index n3 of a base material is 1.53 or more normally, Preferably it is 1.60 or more.
- the refractive index n3 of the base material satisfies the relationship of n3 ⁇ n2 ⁇ n1 when the refractive index of the glass serving as the light emitting surface of the surface light emitter is n1 and the refractive index of the adhesive layer is n2.
- the difference (n3 ⁇ n2) between the refractive index n3 of the substrate and the refractive index n2 of the adhesive layer is preferably 0.05 or less, and more preferably 0.02 or less.
- a base material can be used as a multilayer body in which 2 or more types were laminated
- An adhesion layer is comprised by the acrylic adhesive composition containing acrylic resin (A).
- the acrylic resin (A) is obtained by copolymerizing copolymer component [I] containing 40 to 93% by weight of aromatic ring-containing monomer (a1) and 7 to 60% by weight of hydroxyl group-containing monomer (a2) as essential components.
- the copolymer component [I] may contain a (meth) acrylic acid alkyl ester monomer (a3) and other copolymerizable monomers (a4) as necessary.
- the aromatic ring-containing monomer (a1) can be a compound having one or more aromatic rings and one or more ethylenically unsaturated groups in one molecule.
- a functional group containing an ethylenically unsaturated group include a (meth) acryloyl group, a crotonoyl group, a vinyl group, an allyl group, and the like, and among them, a (meth) acryloyl group is preferable in terms of excellent reactivity.
- examples of the aromatic ring include a benzene ring, a naphthalene ring, an anthracene ring, a biphenyl ring, and a fluorene ring, and the number of aromatic rings per molecule may be one or plural.
- the aromatic ring-containing monomer (a1) is preferably a compound containing one aromatic ring per molecule in terms of achieving a balance of adhesive properties, and can efficiently control the refractive index and birefringence of the pressure-sensitive adhesive layer. Then, it is preferable that it is a compound containing two aromatic rings per molecule.
- aromatic ring-containing monomer (a1) examples include, for example, benzyl (meth) acrylate, benzyloxyethyl (meth) acrylate, phenoxyethyl (meth) acrylate, phenoxydiethylene glycol (meth) acrylate, and ethylene oxide modification.
- (Meth) acrylic acid cresol, ethylene oxide modified (meth) acrylic acid nonylphenol, (meth) acrylic acid biphenyloxyethyl ester, styrene, etc. are mentioned, among which methacrylic acid benzyl and (meth) acrylic acid phenoxyethyl are preferred. . These may be used alone or in combination of two or more.
- Examples of the hydroxyl group-containing monomer (a2) include 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 5-hydroxypentyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 8-hydroxy Hydroxyalkyl esters of acrylic acid such as octyl (meth) acrylate, caprolactone-modified monomers such as caprolactone-modified 2-hydroxyethyl (meth) acrylate, oxyalkylene-modified monomers such as diethylene glycol (meth) acrylate, polyethylene glycol (meth) acrylate, etc.
- Mono-containing monohydric groups such as 2-acryloyloxyethyl 2-hydroxyethylphthalic acid, N-methylol (meth) acrylamide, hydroxyethyl acrylamide, etc.
- -Secondary hydroxyl group-containing monomers such as 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 3-chloro-2-hydroxypropyl (meth) acrylate; 2,2-dimethyl 2-hydroxyethyl (meth) )
- a tertiary hydroxyl group-containing monomer such as acrylate.
- the hydroxyl group-containing monomer (a2) is used alone or in combination of two or more.
- hydroxyl group-containing monomers (a2) a primary hydroxyl group-containing monomer is preferable in terms of excellent reactivity with a crosslinking agent described later, and a monomer having a hydroxyl group at the molecular chain terminal is preferable because it exhibits better antistatic performance. it is conceivable that. Furthermore, it is particularly preferable to use 2-hydroxyethyl (meth) acrylate because it has few impurities such as di (meth) acrylate and is easy to produce.
- hydroxyl group-containing monomer (a2) it is preferable to use those having a content of di (meth) acrylate as an impurity of 0.5% by weight or less, more preferably 0.2% by weight or less, particularly 0%. It is preferable to use one having a weight of 1% or less, specifically 2-hydroxyethyl acrylate or 2-hydroxypropyl acrylate.
- Examples of the (meth) acrylic acid alkyl ester monomer (a3) include, for example, compounds in which the alkyl group usually has 1 to 20, particularly 1 to 12, more preferably 1 to 8, particularly 4 to 8 carbon atoms. Specifically, methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, iso-butyl (meth) acrylate, tert-butyl (meth) acrylate, n-propyl (meth) Acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isodecyl (meth) acrylate, lauryl (meth) acrylate, cetyl (meth) acrylate, stearyl (meth) acrylate, Cyclohexyl (meth) acrylate, isobornyl
- n-butyl (meth) acrylate, 2-ethylhexyl (meth) are preferable in terms of copolymerizability, adhesive properties, ease of handling, and availability of raw materials.
- An acrylate is preferably used, and more preferably n-butyl (meth) acrylate is used in terms of excellent durability.
- Examples of the other copolymerizable monomer (a4) include functional group-containing monomers such as carboxyl group-containing monomers, amino group-containing monomers, acetoacetyl group-containing monomers, isocyanate group-containing monomers, and glycidyl group-containing monomers.
- carboxyl group-containing monomer examples include (meth) acrylic acid, acrylic acid dimer, crotonic acid, maleic acid, maleic anhydride, fumaric acid, citraconic acid, glutaconic acid, itaconic acid, acrylamide N-glycolic acid, and cinnamic acid.
- (meth) acrylic acid is preferably used.
- amino group-containing monomer examples include t-butylaminoethyl (meth) acrylate, ethylaminoethyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, and the like.
- acetoacetyl group-containing monomer examples include 2- (acetoacetoxy) ethyl (meth) acrylate and allyl acetoacetate.
- isocyanate group-containing monomer examples include 2-acryloyloxyethyl isocyanate, 2-methacryloyloxyethyl isocyanate, and alkylene oxide adducts thereof.
- glycidyl group-containing monomer examples include glycidyl (meth) acrylate, allyl glycidyl (meth) acrylate, and the like.
- ethylene glycol di (meth) acrylate For the purpose of increasing the molecular weight, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate
- a compound having two or more ethylenically unsaturated groups such as divinylbenzene can also be used in combination.
- an acid group-containing monomer such as a commonly used carboxyl group-containing monomer may be used in combination as long as the effect of the present invention is not impaired, but it is not used from the viewpoint of corrosion resistance. Is preferred.
- the content of the aromatic ring-containing monomer (a1) needs to be 40 to 93% by weight, preferably 50 to 90% by weight, particularly preferably 55 to 85% by weight, based on the entire copolymerization component. More preferably, it is 60 to 85% by weight. If the content of the aromatic ring-containing monomer is too small, the refractive index is not sufficiently high, which is not preferable.
- the content of the hydroxyl group-containing monomer (a2) needs to be 7 to 60% by weight, preferably 10 to 50% by weight, particularly preferably 10 to 40% by weight, based on the entire copolymerization component. More preferably 10 to 35% by weight.
- the content of the hydroxyl group-containing monomer (a2) is too small, for example, when an inorganic oxide is blended, the compatibility with the inorganic oxide is lowered and the dispersibility is deteriorated. Is not preferable because the content of the aromatic ring-containing monomer (a1) is lowered and the refractive index cannot be sufficiently increased.
- the content in the case of copolymerizing the (meth) acrylic acid alkyl ester monomer (a3) is preferably 0 to 40% by weight, particularly preferably 0 to 35% by weight, more preferably, based on the entire copolymerization component.
- the content is preferably 0 to 30% by weight. If the content of the (meth) acrylic acid ester monomer (a3) is too small, the adhesive performance tends to be lowered.
- the content in the case of copolymerizing the other copolymerizable monomer (a4) is preferably 0 to 40% by weight, particularly preferably 0 to 30% by weight, more preferably 0%, based on the entire copolymerization component.
- the content of the other copolymerizable monomer (a4) is too large, the content of the aromatic ring-containing monomer (a1) is relatively decreased, and the refractive index tends not to be sufficiently increased. There is.
- the acrylic resin (A) can be produced by polymerizing the monomer components (a1) to (a4).
- the polymerization can be performed by a conventionally known method such as solution radical polymerization, suspension polymerization, bulk polymerization, and emulsion polymerization. Among these, solution radical polymerization is preferable.
- the polymerization conditions can be conventionally known general polymerization conditions.
- a polymerization monomer such as an aromatic ring-containing monomer (a1), a hydroxyl group-containing monomer (a2), a (meth) acrylic acid alkyl ester monomer (a3), other copolymerizable monomer (a4), or the like
- an initiator azobisisobutyronitrile, azobisisovaleronitrile, benzoyl peroxide, etc.
- An acrylic resin (A) can be produced.
- organic solvent used for the polymerization examples include aromatic hydrocarbons such as toluene and xylene, esters such as methyl acetate, ethyl acetate and butyl acetate, aliphatic alcohols such as n-propyl alcohol and isopropyl alcohol, acetone, Examples include ketones such as methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone.
- azo-based polymerization initiators such as azobisisobutyronitrile and azobisdimethylvaleronitrile, which are usual radical polymerization initiators, benzoyl peroxide, lauroyl peroxide, Specific examples include peroxide polymerization initiators such as -t-butyl peroxide and cumene hydroperoxide.
- the weight average molecular weight of the acrylic resin (A) needs to be 200,000 or less, preferably 10,000 to 180,000, particularly preferably 10,000 to 160,000, particularly preferably 10,000 to 15 Ten thousand.
- weight average molecular weight is too large, for example, when an inorganic oxide is blended, the compatibility with the inorganic oxide is lowered and the dispersibility is lowered, which is not preferable.
- the degree of dispersion (weight average molecular weight / number average molecular weight) of the acrylic resin (A) is preferably 10 or less, particularly preferably 8 or less, more preferably 6 or less, and particularly preferably 5 or less. preferable. When the degree of dispersion is too high, the durability performance of the pressure-sensitive adhesive layer tends to decrease.
- the lower limit of the degree of dispersion is usually 1.1 from the viewpoint of production limit.
- the glass transition temperature of the acrylic resin (A) is preferably ⁇ 70 to 10 ° C., particularly preferably ⁇ 50 to 5 ° C., and further preferably ⁇ 40 to 0 ° C. If the glass transition temperature is too high, the adhesive strength tends to increase too much, and if it is too low, the heat resistance tends to decrease.
- the said weight average molecular weight is a weight average molecular weight by standard polystyrene molecular weight conversion, a high performance liquid chromatography (Nippon Waters company make, “Waters 2695 (main body)” and “Waters 2414 (detector)”), column : Shodex GPC KF-806L (exclusion limit molecular weight: 2 ⁇ 10 7 , separation range: 100 to 2 ⁇ 10 7 , theoretical plate number: 10,000 plates / piece, filler material: styrene-divinylbenzene copolymer, filler The particle diameter is measured by using three series of 10 ⁇ m), and the same method can be used for the number average molecular weight.
- the degree of dispersion is determined from the weight average molecular weight and the number average molecular weight.
- the acrylic pressure-sensitive adhesive composition can contain an inorganic oxide (B), a crosslinking agent (C), and / or a plasticizer (D) in addition to the acrylic resin (A).
- a metal oxide is preferable.
- Coated particles (hereinafter also referred to as reactive modified metal oxide particles) containing an organic substance having a hydrogen atom are preferred.
- the reactive functional group may be in a state having an interaction such as a hydrogen bond with the metal oxide, or may be in a state capable of interacting with another substance without being in such a state.
- the inorganic oxide (B) is preferably an inorganic oxide fine particle in a fine particle state. Further, examples of the inorganic oxide fine particle include fine particle powder, paste, or sol. Is a sol.
- a metal oxide generally used as a filler for a resin is preferably used.
- a metal oxide include zirconium oxide (ZrO 2 : zirconia) and titanium oxide (TiO 2 : Titania), aluminum oxide (Al 2 O 3 : alumina), iron oxide (Fe 2 O 3 , Fe 3 O 4 ), copper oxide (CuO), zinc oxide (ZnO), yttrium oxide (Y 2 O 3 : yttria) , Niobium oxide (Nb 2 O 5 ), molybdenum oxide (MoO 3 , MoO 2 ), indium oxide (In 2 O 3 ), tin oxide (SnO 2 ), tantalum oxide (Ta 2 O 5 , TaO 2 ), tungsten oxide (WO 3, WO 2), lead oxide (PbO), bismuth oxide (Bi 2 O 3), cerium oxide (CeO 2: ceria), acid Antimony (Sb 2 O 3, Sb 2 O 5), t
- non-metal oxide examples include silicon oxide (SiO 2 : silica) or boron oxide (B 2 O 3 ) that is generally used as a filler for resins. These metal oxides and nonmetal oxides may be used alone or in combination. Among these, zirconium oxide (ZrO 2 : zirconia) and titanium oxide (TiO 2 : titania) are preferable from the viewpoint of easily obtaining an acrylic resin having a high refractive index.
- Examples of reactive functional groups in organic substances having reactive functional groups include hydroxyl groups, phosphoric acid groups, carboxyl groups, amino groups, alkoxy groups, isocyanate groups, acid halides, acid anhydrides, glycidyl groups, chlorosilane groups, and alkoxy groups.
- a silane group is mentioned.
- an organic substance having an isocyanate group is particularly preferable because the stability between the metal oxide and the surrounding substance can be improved.
- organic substance having an isocyanate group examples include acryloxymethyl isocyanate, methacryloxymethyl isocyanate, acryloxyethyl isocyanate, methacryloxyethyl isocyanate, acryloxypropyl isocyanate, methacryloxypropyl isocyanate, 1,1-bis (acryloxymethyl) Ethyl isocyanate is mentioned.
- the content of the organic substance having a reactive functional group may be 1 to 40 parts by weight with respect to 100 parts by weight of the metal oxide.
- Reactive modified metal oxide particles are mixed with metal oxide particles, organic substances having a reactive functional group, an organic solvent, and optional additives that can be added as necessary. Accordingly, by performing treatment such as ultrasonic treatment, a suspension in which particles are dispersed in an organic solvent can be obtained.
- organic solvents examples include ketones such as methyl ethyl ketone, methyl isobutyl ketone, acetone and cyclohexanone, aromatic hydrocarbons such as benzene, toluene, xylene and ethylbenzene, methanol, ethanol, isopropyl alcohol, n-butanol, iso-butanol and the like Alcohols, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, and other ethers, ethyl acetate, butyl acetate, ethyl lactate, ⁇ -butyrolactone, propylene glycol monomethyl ether Esters such as acetate and propylene glycol monoethyl ether acetate, dimethylform Bromide, N, N- dimethyl acetoacetamide,
- the reactive modified metal oxide particles are obtained as a suspension in which the particles are dispersed in an organic solvent, conditions such as the amount of the solvent are adjusted, and the reactive modified metal oxide particles are 1 in the suspension. It is preferable from the viewpoint of the ease of production and the like that the content is adjusted so as to be contained by ⁇ 50% by weight and used as it is for the production of the pressure-sensitive adhesive composition.
- preparing the mixture it is preferable to mix the components using a bead mill or the like.
- secondary particles or higher-order particles can be pulverized to the primary particle level, and the surface can be treated in the form of primary particles. As a result, uniform surface treatment can be performed.
- the mixture can be further sonicated as necessary.
- the ultrasonic treatment can be performed using an apparatus such as an ultrasonic cleaning machine, an ultrasonic homogenizer, or an ultrasonic dispersing machine. By such treatment, a good suspension can be obtained.
- grain may be provided as a slurry containing components, such as a solvent and an additive, it can be used as a material of the adhesive composition of this invention in the state of the slurry containing this component as it is.
- a slurry of reactive modified metal oxide particles containing ZrO 2 as a metal oxide a trade name “NANON5 ZR-010” (manufactured by Solar Co., Ltd., solvent: methyl ethyl ketone, particle content 30%, surface modified An organic substance having a reactive functional group: an isocyanate having a polymerizable functional group, and a volume average particle diameter of 15 nm).
- a trade name “NOD-742GTF” manufactured by Nagase ChemteX Corporation, solvent: polyethylene glycol monomethyl ether, particle content 30%, Volume average particle diameter of 48 nm.
- the volume average particle diameter of the inorganic oxide (B) is preferably 5 nm or more, more preferably 10 nm or more, particularly preferably 20 nm or more, and preferably 50 nm or less, more preferably 40 nm or less. And particularly preferably 30 nm or less.
- the particle size range may be the primary particle size range.
- the particle size can be measured by using a dynamic light scattering particle size distribution analyzer (Nanotrac Wave-EX150, manufactured by Nikkiso Co., Ltd.) and using the volume as a reference for the particle size.
- the lower limit of the content ratio of the inorganic oxide (B) in the acrylic pressure-sensitive adhesive composition is preferably 80 parts by weight or more, preferably 85 parts by weight or more with respect to 100 parts by weight of the acrylic resin (A). Yes, more preferably 90 parts by weight or more.
- the upper limit of the content ratio of the inorganic oxide (B) is 130 parts by weight or less, preferably 120 parts by weight or less, more preferably 110 parts by weight with respect to 100 parts by weight of the acrylic resin (A). It is as follows. If the content of the inorganic oxide (B) is small, the desired refractive index may not be obtained, and if the content is large, the adhesive strength may be insufficient.
- the inorganic oxide (B) one having a high refractive index is preferable, and specifically, one having a refractive index of 1.5 or more is preferable. Thus, by using a thing with a high refractive index, content of the inorganic oxide (B) in an adhesive can be decreased, and adhesiveness can fully be exhibited.
- the high refractive index inorganic oxide include titanium oxide (refractive index: 2.3 to 2.7), potassium titanate (refractive index: 2.68), and zirconium oxide (refractive index: 2.05 to 2). .4), zinc oxide (refractive index: 2.01 to 2.03), and the like.
- the crosslinking agent (C) can be blended for the purpose of crosslinking between the acrylic resins (A), and for the purpose of imparting durability as a certain degree of hardness to the adhesive layer by crosslinking between the acrylic resins (A). Blended.
- the crosslinking agent (C) include chemical crosslinking such as isocyanate crosslinking agent, epoxy crosslinking agent, aziridine crosslinking agent, melamine crosslinking agent, aldehyde crosslinking agent, amine crosslinking agent, and metal chelate crosslinking agent.
- Examples thereof include a crosslinking agent that forms physical crosslinking such as a crosslinking agent and a polyfunctional acrylate-based crosslinking agent.
- a cross-linking agent that reacts with a hydroxyl group is preferable, and an isocyanate-based cross-linking agent and a metal chelate-based cross-linking agent are particularly preferable, and the reaction with the acrylic resin (A) is improved. From the viewpoint of properties, an isocyanate-based crosslinking agent is more preferable.
- isocyanate crosslinking agent examples include 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, hydrogenated tolylene diisocyanate, 1,3-xylene diisocyanate, 1,4-xylylene diisocyanate, hexamethylene diisocyanate.
- Diphenylmethane-4,4-diisocyanate isophorone diisocyanate, 1,3-bis (isocyanatomethyl) cyclohexane, tetramethylxylylene diisocyanate, 1,5-naphthalene diisocyanate, triphenylmethane triisocyanate, and their polyisocyanate compounds
- Examples include adducts with polyol compounds such as trimethylolpropane, burettes and isocyanurates of these polyisocyanate compounds.
- metal chelate crosslinking agent examples include acetylacetone and acetoacetyl ester coordination compounds of polyvalent metals such as aluminum, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, panadium, chromium, and zirconium. Can be mentioned.
- crosslinking agents (C) may be used alone or in combination of two or more.
- the content of the crosslinking agent (C) is preferably 0.01 to 20 parts by weight, more preferably 0.02 to 15 parts by weight, particularly preferably 100 parts by weight of the acrylic resin (A). Is 0.03 to 10 parts by weight. If the amount of the crosslinking agent (C) is too small, the cohesive force tends to decrease, and a sufficient durability cannot be obtained. If the amount is too large, the flexibility and the adhesive strength tend to decrease and peeling easily occurs. There is a tendency for adhesion to glass and glass to decrease.
- the acrylic pressure-sensitive adhesive composition is an antistatic agent, other acrylic pressure-sensitive adhesive, other pressure-sensitive adhesive, urethane resin, rosin, rosin ester, hydrogenated rosin ester, and phenol resin, as long as the effects of the present invention are not impaired.
- various additives such as, and compounds that cause coloration or discoloration upon irradiation with ultraviolet rays or radiation can be blended.
- a small amount of impurities and the like contained in the raw materials for producing the constituent components of the acrylic pressure-sensitive adhesive composition may be contained. These addition amounts can be appropriately set so as to obtain desired physical properties.
- the pressure-sensitive adhesive layer can be formed by applying the acrylic pressure-sensitive adhesive composition onto a substrate, drying it, and curing it by heating.
- heat at the time of drying, irradiation of active energy rays, etc. first apply silicone etc. to a separator having release properties. It is preferable to bond to the base material.
- the acrylic pressure-sensitive adhesive composition can be diluted with a solvent to a viscosity suitable for coating, and the dilution concentration is preferably 5 as the solid content concentration. It is ⁇ 90% by weight, particularly preferably 10 to 80% by weight, further 20 to 75% by weight.
- the solvent is not particularly limited as long as it dissolves the acrylic pressure-sensitive adhesive composition.
- ester solvents such as methyl acetate, ethyl acetate, methyl acetoacetate, ethyl acetoacetate, acetone,
- a ketone solvent such as methyl ethyl ketone and methyl isobutyl ketone
- an aromatic solvent such as toluene and xylene
- an alcohol solvent such as methanol, ethanol and propyl alcohol
- ethyl acetate and methyl ethyl ketone are preferably used from the viewpoints of solubility, drying property, price, and the like.
- the viscosity (25 ° C.) of the acrylic pressure-sensitive adhesive composition diluted with the solvent is preferably 20,000 mPa ⁇ s or less, particularly preferably 18,000 mPa ⁇ s or less, more preferably 15,000 mPa ⁇ s or less. is there.
- the lower limit of the normal viscosity is 100 mPa ⁇ s. If the viscosity is too high, coating tends to be difficult, for example, coating stripes are likely to appear.
- the viscosity can be measured according to the 4.5.3 rotational viscoclock method of JIS K5400 (1990).
- the application of the acrylic pressure-sensitive adhesive composition to the substrate can be performed by a conventional method such as roll coating, die coating, gravure coating, comma coating, screen printing or the like.
- the thickness of the pressure-sensitive adhesive layer (film thickness after drying) is usually 3 to 500 ⁇ m, preferably 5 to 300 ⁇ m, and more preferably 10 to 250 ⁇ m.
- the drying temperature is usually 50 ° C. to 250 ° C., preferably 60 ° C. to 150 ° C., more preferably 65 ° C. to 120 ° C., particularly preferably 70 ° C. to 95 ° C., and the drying time is Usually 10 seconds to 10 minutes.
- the temperature is usually from room temperature to 70 ° C.
- the time is usually from 1 day to 30 days.
- the reaction may be performed at 1 ° C. for 20 days at 23 ° C., preferably 3-10 days at 23 ° C., 1-7 days at 40 ° C.
- the cured layer of the pressure-sensitive adhesive composition before the aging treatment and the layer after the aging treatment are referred to as “adhesion layer” without distinction.
- the plasticizer (D) can be used to lower the viscosity of the acrylic pressure-sensitive adhesive composition and maintain the adhesiveness. That is, the acrylic pressure-sensitive adhesive composition increases in viscosity by containing particles, particularly reactive modified metal oxide particles, and as a result, the adhesiveness may decrease. In this case, a plasticizer (D) is added. Thus, it is possible to maintain the adhesiveness. As a result, it is possible to achieve both a high refractive index and high adhesiveness.
- the plasticizer (D) preferably has a melting point of 0 ° C. or lower, more preferably ⁇ 10 ° C. or lower. The lower limit of the melting point is preferably ⁇ 70 ° C. or higher, more preferably ⁇ 60 ° C. or higher. When the melting point of the plasticizer (D) is within this range, there is an advantage that the compatibility is excellent, there is no adhesive residue on the adherend, and there is appropriate tackiness.
- plasticizers (D) include polybutenes, vinyl ethers, polyethers (including polyalkylene oxides and functionalized polyalkylene oxides), esters, polyols (eg, glycerin), petroleum resins, hydrogenated petroleum resins, and Examples thereof include styrenic compounds (for example, ⁇ -methylstyrene).
- esters since the miscibility with the acrylic pressure-sensitive adhesive composition is good and the refractive index is relatively high, esters, in particular, aromatic ring-containing esters such as benzoic acid and phthalic acid can be preferably used. .
- plasticizer (D) examples include diethylene glycol dibenzoate, dipropylene glycol dibenzoate, benzyl benzoate, and 1,4-cyclohexanedimethanol dibenzoate.
- plasticizers include dipropylene glycol dibenzoate and benzyl benzoate.
- the phthalic acid ester examples include dimethyl phthalate, diethyl phthalate, dibutyl phthalate, butyl benzyl phthalate, dicyclohexyl phthalate, and ethyl phthalyl ethyl glycolate.
- commercially available plasticizer (D) examples include trade name “BENZOFLEX 9-88SG” (Eastman) and trade name “ ⁇ -methylstyrene” (Mitsubishi Chemical Corporation).
- the content of the plasticizer (D) in the acrylic pressure-sensitive adhesive composition is preferably 5 parts by weight or more, more preferably 10 parts by weight or more, with respect to 100 parts by weight of the acrylic resin (A). Preferably it is 20 weight part or less, More preferably, it is 15 weight part or less.
- the said acrylic adhesive composition can contain arbitrary components as needed.
- optional components include silane coupling agents, light diffusing particles, and solvents.
- silane coupling agents include vinyltrimethoxysilane, vinyltriethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyl Trimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyltriethoxysilane, p-styryltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropyltriethoxysilane, 3-acryloxypropyltrimethoxysilane, N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane N-2- (aminoethyl) e
- silane coupling agent one kind may be used alone, or two or more kinds may be mixed and used.
- a trade name “KBM-803” manufactured by Shin-Etsu Chemical Co., Ltd.
- the content ratio is preferably 0.05 parts by weight or more, more preferably 0.1 parts by weight with respect to 100 parts by weight of the acrylic resin (A). Part by weight or more, preferably 5 parts by weight or less, more preferably 3 parts by weight or less.
- Examples of the solvent include the same organic solvent used for the production of the reactive modified metal oxide particles.
- the acrylic pressure-sensitive adhesive composition contains a solvent
- the content is preferably 50 parts by weight or more, more preferably 100 parts by weight or more with respect to 100 parts by weight of the total solid content, It is 300 parts by weight or less, more preferably 250 parts by weight or less.
- the acrylic pressure-sensitive adhesive composition can also contain light diffusing particles.
- the light diffusing particles organic materials can be used. Examples of organic materials include silicone resins, acrylic resins, and polystyrene resins.
- the particle diameter of the organic light diffusing particles is preferably 0.2 ⁇ m or more, more preferably 0.5 ⁇ m or more, on the other hand, preferably 5 ⁇ m or less, more preferably 3 ⁇ m or less.
- organic light diffusing particles made of silicone resin the trade name “XC-99” (manufactured by Momentive Performance Materials, volume average particle diameter 0.7 ⁇ m) can be mentioned.
- organic light diffusing particles made of acrylic resin the trade name “MP series” (manufactured by Soken Chemical Co., Ltd., volume average particle diameter 0.8 ⁇ m) can be mentioned.
- SX series the trade name “SX series” (manufactured by Soken Chemical Co., Ltd., volume average particle diameter 3.5 ⁇ m) can be mentioned.
- the acrylic resin (A), reactive modified metal oxide particles, organic light diffusing particles, and optional components described above may be obtained as solutions or suspensions dissolved or dispersed in a solvent. In that case, you may mix
- the refractive index n2 of the pressure-sensitive adhesive layer thus obtained is preferably 1.50 or more, particularly preferably 1.53 or more, and further preferably 1.60 or more.
- the upper limit of the refractive index of the pressure-sensitive adhesive layer is usually 2.00.
- the acrylic resin (A) having a high refractive index of the acrylic resin and excellent compatibility with the inorganic oxide fine particles can be obtained.
- the adhesive layer which consists of an acrylic adhesive composition which has a high refractive index and was excellent also in adhesive force can be obtained.
- the refractive index can be measured with an ellipsometer (M-2000 manufactured by JA Woollam Japan Co., Ltd.).
- the adhesive layer has a total light transmittance of 80% or more, more preferably 85% or more.
- the total light transmittance can be measured according to JIS K 7136.
- the adhesiveness to glass of the adhesion layer is 5 N / 25 mm or more, 7.5 N / 25 mm or more.
- the upper limit of the adhesion to the glass of the adhesive layer is not particularly limited, but is usually 30 N / 25 mm or less. Measurement of adhesion of the adhesive layer to glass can be performed according to JIS K 6854-1.
- an uneven structure layer can be provided.
- the uneven structure layer is formed for the purpose of efficiently extracting light emitted from the light emitting surface of the surface light emitter.
- the uneven structure layer can constitute an exposed surface exposed to the outside.
- the concavo-convex structure layer preferably has a plurality of concave portions including slopes and flat portions located around the concave portions.
- the said recessed part is a part comparatively depressed compared with a flat part, it becomes a recessed part, and since the flat part protrudes relatively compared with a recessed part, it corresponds to a convex part. With such an uneven structure, an uneven structure layer is formed.
- the concavo-convex structure layer includes a plurality of concave portions including four inclined surfaces and a flat portion positioned around the concave portions.
- the “slope” is a surface that forms an angle that is not parallel to the exposed surface (outermost surface) of the concavo-convex structure layer.
- the surface on the flat portion is a flat surface parallel to the exposed surface.
- Each of the plurality of recesses is a regular quadrangular pyramid-shaped depression, and the depressions are arranged at a specific interval. The four slopes constituting the recess have the same shape, and the base of the regular quadrangular pyramid forms a square.
- each recess can be usually 1 ⁇ m to 200 ⁇ m, preferably 2 ⁇ m to 100 ⁇ m.
- the depth of each recess can be usually 1 ⁇ m to 50 ⁇ m, and preferably 2 ⁇ m to 40 ⁇ m.
- the recesses are arranged continuously along two orthogonal in-plane directions X and Y at a constant interval. And in the said in-plane direction X and Y, the part which hits the clearance gap between adjacent recessed parts comprises the flat part. Therefore, the concavo-convex structure layer is supposed to have concave portions and flat portions alternately in the in-plane directions X and Y parallel to the exposed surface.
- one in-plane direction X is parallel to the two bases.
- the plurality of recesses are aligned at a constant interval.
- the other in-plane direction Y is parallel to the other two bases.
- the plurality of recesses are aligned at a constant interval.
- the width of the flat portion which is a portion corresponding to the gap, can be usually 0.1 ⁇ m to 50 ⁇ m.
- the angle formed by the four slopes constituting each of the recesses with the flat portion (and thus the light emitting surface) is preferably 10 ° or more, more preferably 20 ° or more, and preferably 170 ° or less, more preferably 160 ° or less. .
- the apex angle is preferably 30 ° to 120 °.
- the distances in the thickness direction between the bottoms of the adjacent concave portions and the tips of the convex portions may be uneven within a predetermined range, or may be aligned.
- the bottom of the recess refers to the most depressed portion in each of the recesses, and refers to the portion where the distance to the glass light emitting surface in the thickness direction is the shortest.
- tip of a convex part points out the part most projected in each convex part, and points out the part where the distance to the glass-made light emission surface in the thickness direction becomes the longest.
- the ratio of the area occupied by the flat part to the total of the area occupied by the flat part and the area occupied by the concave part (hereinafter referred to as “flat part ratio”) can be adjusted as appropriate. Specifically, when the flat portion ratio is 10% to 75%, good light extraction efficiency can be realized, and the mechanical strength of the concavo-convex structure layer can be increased.
- the concavo-convex structure layer can be configured as a plurality of layers, or can be configured as a single layer.
- the concavo-convex structure layer can be usually formed from a resin composition containing a transparent resin. That the transparent resin is “transparent” means that it has a light transmittance suitable for use in an optical member.
- the concavo-convex structure layer layer may have a total light transmittance of 80% or more.
- the transparent resin is not particularly limited, and various resins that can form a transparent layer can be used.
- various resins that can form a transparent layer can be used.
- examples thereof include a thermoplastic resin, a thermosetting resin, an ultraviolet curable resin, and an electron beam curable resin.
- thermoplastic resins are preferable because they can be easily deformed by heat, and ultraviolet curable resins have high curability and high efficiency, so that an uneven structure layer can be formed efficiently.
- thermoplastic resin examples include polyester-based, polyacrylate-based, and cycloolefin polymer-based resins.
- ultraviolet curable resin examples include epoxy resins, acrylic resins, urethane resins, ene / thiol resins, and isocyanate resins. As these resins, those having a plurality of polymerizable functional groups can be preferably used. In addition, the said resin may be used individually by 1 type, and may be used combining two or more types by arbitrary ratios.
- a material constituting the concavo-convex structure layer a material having a high hardness at the time of curing is preferable from the viewpoint of easily forming the concavo-convex structure and easily obtaining scratch resistance of the concavo-convex structure.
- a material having a pencil hardness of HB or higher is preferable, and a material of H or higher is more preferable.
- the material which becomes 2H or more is more preferable.
- Such a combination of materials can be obtained by appropriately selecting the transparent resin exemplified above as a resin constituting each material.
- an ultraviolet curable resin such as acrylate is used as the transparent resin constituting the concavo-convex structure layer
- an alicyclic olefin polymer film for example, Nippon Zeon Co., Ltd.
- a ZEONOR film or a polyester film is preferable to use.
- the refractive index of the uneven structure layer and the substrate may be as close as possible.
- the refractive index difference between the uneven structure layer and the substrate is preferably within 0.1, and more preferably within 0.05.
- the resin composition can contain arbitrary components as necessary.
- the optional component include additives such as phenol-based and amine-based deterioration preventing agents; surfactant-based, siloxane-based antistatic agents; triazole-based, 2-hydroxybenzophenone-based light-resistant agents; Can be mentioned.
- the thickness of the concavo-convex structure layer is not particularly limited, but is preferably 1 ⁇ m to 70 ⁇ m.
- the thickness of the concavo-convex structure layer is the distance between the surface on the substrate side where the concavo-convex structure is not formed and the flat portion of the concavo-convex structure.
- the concavo-convex structure layer can be performed, for example, by preparing a mold such as a mold having a desired shape and transferring the mold to a material layer for forming the concavo-convex structure layer.
- a light diffusion layer In addition to the concavo-convex structure layer, a light diffusion layer, an ultraviolet absorption layer, or the like can be provided.
- a light-diffusion layer is realizable by mix
- the light passing through the light diffusion layer can be diffused to change the optical path of the light, and the light extraction efficiency can be further increased by increasing the optical path length.
- the light diffusing material examples include a material containing particles and an alloy resin that diffuses light by mixing two or more kinds of resins.
- a material including particles is preferable, and a resin composition including particles is particularly preferable.
- the shape of the particles can be, for example, a spherical shape, a cylindrical shape, a cubic shape, a rectangular parallelepiped shape, a pyramid shape, a conical shape, a star shape, or the like.
- the particle diameter of the particles is preferably 0.1 ⁇ m or more, preferably 10 ⁇ m or less, more preferably 5 ⁇ m or less.
- the particle diameter is a 50% particle diameter in an integrated distribution obtained by integrating the volume-based particle amount with the particle diameter as the horizontal axis.
- the larger the particle size the larger the content ratio of particles necessary for obtaining the desired effect, and the smaller the particle size, the smaller the content.
- the diameter of the sphere having the same volume is used as the particle size.
- the difference between the refractive index of the particles and the refractive index of the transparent resin is preferably 0.05 to 0.5. More preferably, it is 07 to 0.5.
- either the particle or the refractive index of the transparent resin may be larger. If the refractive indexes of the particles and the transparent resin are too close, the diffusion effect cannot be obtained and the desired effect may not be obtained. Conversely, if the difference is too large, the diffusion may become too large and loss may occur.
- the content ratio of the particles is a volume ratio in the total amount of the layer containing the particles, preferably 1% or more, more preferably 5% or more, 80% or less, and more preferably 50% or less.
- desired effects such as a diffusion effect can be obtained.
- this upper limit or less aggregation of particle
- the surface light source device uses an organic material, the organic material may be easily deteriorated by ultraviolet rays such as sunlight. Therefore, it is also effective to provide an ultraviolet absorbing layer containing an ultraviolet absorber.
- an organic material or an inorganic material may be used. Examples of ultraviolet absorbers include benzophenone-based, benzotriazole-based, triazine-based, and phenyl salicylate-based ultraviolet absorbers as organic materials.
- preferred specific examples include 2,4-dihydroxy-benzophenone, 2-hydroxy-4-methoxybenzophenone, 4-dodecyloxy-2-hydroxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone, 2- (2′-hydroxy-5-methylphenyl) benzotriazole, 2- (2′-hydroxy-3 ′, 5′-ditertiarybutylphenyl) benzotriazole, 2,4-bis “2-hydroxy-4-butoxyphenyl” ] -6- (2,4-dibutoxyphenyl) -1,3-5-triazine, phenyl salicylate, p-octylphenyl salicylate, p-tertiarybutylphenyl salicylate, etc.
- Inorganic Examples of the ultraviolet absorber made of the material include titanium dioxide and oxide oxide. , Like cerium oxide. Among them, it is preferable to use an inorganic material.
- a wavelength conversion material capable of converting the wavelength of the absorbed ultraviolet light into light having a longer wavelength than the absorbed ultraviolet light may be used.
- the light whose wavelength is converted by the absorbed ultraviolet light include visible light, near-infrared light, and infrared light, and a wavelength conversion material that can convert the wavelength into visible light is preferable.
- An example of the wavelength conversion material is a phosphor.
- the phosphor is usually a material that can absorb excitation light and emit fluorescence having a wavelength longer than that of the excitation light.
- a phosphor that can absorb ultraviolet rays as excitation light and can emit fluorescence having a wavelength that can be used for charge generation in the active layer can be used.
- rare earth complexes can be cited as examples of organic phosphors.
- Rare earth complexes are phosphors having excellent fluorescence characteristics. Specific examples include [Tb (bpy) 2 ] Cl 3 complex, [Eu (phen) 2 ] Cl 3 complex, and [Tb (terpy) 2 ] Cl 3 complex. Etc.
- “Bpy” represents 2,2-bipyridine, “phen” represents 1,10-phenanthroline, and “terpy” represents 2,2 ′: 6 ′, 2 ”-terpyridine.
- Inorganic phosphor MgF 2 : Eu 2+ (absorption wavelength: 300 nm to 400 nm, fluorescence wavelength: 400 nm to 550 nm), 1.29 (Ba, Ca) O ⁇ 6Al 2 O 3 : Eu 2+ (absorption wavelength: 200 nm to 400 nm, fluorescence) Wavelength 400 nm to 600 nm), BaAl 2 O 4 : Eu 2+ (absorption wavelength 200 nm to 400 nm, fluorescence wavelength 400 nm to 600 nm), Y 3 Al 5 O 12 : Ce 3+ (absorption wavelength 250 nm to 450 nm, fluorescence wavelength 500 nm to 700 nm), etc.
- it is preferable to use an inorganic phosphors it is
- the ultraviolet absorbing layer may contain a binder in order to hold the ultraviolet absorber.
- a binder it is preferable to use a material that can hold the ultraviolet absorber in the ultraviolet absorbing layer without significantly impairing the effects of the present invention, and a resin is usually used.
- resins that can be used as the binder include polyester resins, epoxy resins, acrylic resins, and fluorine resins.
- a binder may be used individually by 1 type and may be used combining two or more types by arbitrary ratios.
- the thickness of the ultraviolet absorbing layer is usually 1 ⁇ m or more, preferably 10 ⁇ m or more, more preferably 100 ⁇ m or more, and usually 10,000 ⁇ m or less, preferably 5000 ⁇ m or less, more preferably 3000 ⁇ m or less.
- the position where the ultraviolet absorbing layer is provided is not particularly limited.
- the surface light source device of the present invention includes a surface light emitter having a light emitting surface made of glass and the optical laminate, and the adhesive layer is adhered to the light emitting surface.
- a surface light emitter comprising an organic EL element can be used.
- the pressure-sensitive adhesive layer constituting the laminate can be suitably used in a see-through type surface light source device in which the other side of the surface light emitter can be looked over by making the electrode of the organic EL element transparent because of its high transparency.
- the refractive index n1 of the glass constituting the light emitting surface is usually 1.50 or more, preferably 1.51 or more, more preferably 1.53 or more, and 2.00 or less.
- the refractive index of the glass n1 satisfies the relationship of n3 ⁇ n2 ⁇ n1 between the refractive index of the adhesive layer n2 and the refractive index of the base material n3.
- the difference (n3 ⁇ n2) between the refractive index n3 of the substrate and the refractive index n2 of the adhesive layer is 0.05 or less, preferably 0.01 or less.
- the method for manufacturing the surface light source device is not particularly limited.
- a base material on which an adhesive layer is formed is attached to the glass light emitting surface of the organic EL light emitter, and further, if necessary, the uneven structure layer or the like. It can manufacture by sticking each layer.
- polymerization was carried out for 7 hours while successively adding a polymerization catalyst solution in which 0.06 part of AIBN was dissolved in 2 parts of ethyl acetate, and an acrylic resin (A-1) solution (solid content concentration 65.0%, viscosity) 1100 mPa ⁇ s (25 ° C.), weight average molecular weight 108,200, number average molecular weight 41,700, dispersity 2.59, glass transition temperature ⁇ 26.6 ° C.).
- A-1 acrylic resin
- polymerization was carried out for 7 hours while successively adding a polymerization catalyst solution in which 0.06 part of AIBN was dissolved in 2 parts of ethyl acetate, and an acrylic resin (A-2) solution (solid content concentration 65.1%, viscosity) 2,500 mPa ⁇ s (25 ° C), weight average molecular weight 126,000, number average molecular weight 48,000, dispersity 2.63, glass transition temperature -20.8 ° C).
- A-2 acrylic resin
- polymerization was carried out for 7 hours while successively adding a polymerization catalyst solution in which 0.06 part of AIBN was dissolved in 2 parts of ethyl acetate, and an acrylic resin (A-3) solution (solid content concentration 65.1%, viscosity) 1300 mPa ⁇ s (25 ° C.), weight average molecular weight 105,000, number average molecular weight 36,000, dispersity 2.92, glass transition temperature ⁇ 8.3 ° C.).
- A-3 acrylic resin
- polymerization was carried out for 7 hours while successively adding a polymerization catalyst solution in which 0.06 part of AIBN was dissolved in 2 parts of ethyl acetate, and an acrylic resin (A-4) solution (solid content concentration 65%, viscosity 3, 000 mPa ⁇ s (25 ° C.), weight average molecular weight 99,500, number average molecular weight 36,800, dispersity 2.70, glass transition temperature ⁇ 26.4 ° C.).
- A-4 acrylic resin
- a polyester-based release sheet is bonded to the surface of the multilayer layer on the pressure-sensitive adhesive layer side, and has a layer structure of (release sheet) / (pressure-sensitive adhesive layer) / (release sheet). I got a thing. This was aged at 40 ° C. for 10 days to obtain a double-sided PSA sheet. Using this double-sided PSA sheet, the refractive index was measured and evaluated according to the following methods. In a 25 ° C. atmosphere, the refractive index of the adhesive layer was measured with an Abbe refractometer using the double-sided adhesive sheet prepared above.
- the release sheet on one surface was peeled off from the adhesive layer of the double-sided adhesive sheet to form a two-layered product having a layer structure of (release sheet) / (adhesive layer).
- PET polyethylene terephthalate
- Examples 1 to 4 Release from the PET film with the adhesive layer obtained using the acrylic resins (A-1), (A-2), (A-3) and (A-4) obtained in Production Examples 1 to 4.
- the mold sheet was peeled off to obtain a multilayered product (optical laminate) having a layer structure of (adhesive layer) / (PET film).
- the peel strength of this adhesive layer was evaluated in the same manner as the evaluation of the adhesive layer obtained with the compositions of Production Examples 1 to 4. The results are shown in Table 1.
- the release sheet on one surface was peeled off from the adhesive layer of the double-sided adhesive sheet to form a two-layered product having a layer structure of (release sheet) / (adhesive layer).
- the surface on the adhesive layer side of this multilayer was pressed against a 100 ⁇ m polyethylene terephthalate (PET) film. Thereby, a PET film with an adhesive layer having a layer structure of (release sheet) / (adhesive layer) / (PET film) was obtained.
- PET polyethylene terephthalate
- the release sheet was peeled off from the obtained PET film with an adhesive layer to obtain a multilayered product (optical laminate) having a layer configuration of (adhesive layer) / (PET film).
- n1 1.63
- n2 1.48
- n3 1.53
- the simulation conditions were as follows.
- the modeled laminated structure consists of a film (thickness 100 ⁇ m), an adhesive layer (thickness 10 ⁇ m), a glass substrate (thickness 0.7 mm, refractive index 1.63), a transparent electrode (thickness 100 nm, refractive index 1) from the device light exit surface side. .9), light emitting layer (thickness 20 nm, refractive index 1.7), reflective electrode (thickness 100 nm, refractive index 1.5, reflectance 85%), sealing substrate (thickness 0.7 mm, refractive index 1.52) It was.
- the refractive index of the film and the adhesive layer was set according to each example and comparative example, and the surface of the transparent electrode on the device exit surface side was the light emitting surface, and the luminous intensity of the light emitting surface was 1 lumen.
- the light extraction amount of the surface light source device obtained in Comparative Example 1 was set to 1, and the light extraction amount compared with the light extraction amount of the surface light source device of each example was obtained as the light extraction efficiency.
- the obtained results are shown in Table 1. The larger this value, the better the light extraction efficiency.
- Acrylic adhesive composition 100 parts of the acrylic resin (A-1) solution obtained in Production Example 1 (corresponding to the solid content) and a zirconium oxide particle dispersion (NANON5 ZR-010, volume average particle diameter 15 nm, manufactured by Solar) as inorganic particles 122 parts (solid content equivalent amount), 14 parts of plasticizer (BENZOFLEX 9-88SG) (manufactured by Eastman) mp-30 ° C.), light diffusion particles (silicone particles having a volume average particle diameter of 0.7 ⁇ m) , Momentive Performance Material Co., Ltd., product name "XC-99" 8.47 parts was added and stirred for 15 minutes to obtain an acrylic pressure-sensitive adhesive composition. The compatibility of the obtained composition was confirmed visually. As a result, the compatibility was satisfactory without any problems (separation and gelation were not observed).
- a double-layered product having a layer structure of (adhesive layer) / (base material) was obtained. Thereafter, a polyester-based release sheet is bonded to the surface of the multi-layered product on the pressure-sensitive adhesive layer side, and a three-layered multi-layered material having a layer structure of (release sheet) / (pressure-sensitive adhesive layer) / (base material) Got. This was aged at 40 ° C. for 10 days to obtain an optical laminate having an adhesive layer and a substrate.
- the acrylic pressure-sensitive adhesive composition obtained in (5-1) was applied to one side of a glass plate so that the thickness after drying was 20 ⁇ m, and dried at 80 ° C. for 5 minutes to measure the refractive index. An adhesive layer was formed. The refractive index of this adhesive layer was measured with an ellipsometer (M-2000 manufactured by JA Woollam Japan Co., Ltd.). The results are shown in Table 2.
- Example 6 An optical laminate was obtained and evaluated in the same manner as in Example 1 except that the acrylic resin (A-1) solution was changed to the acrylic resin (A-2) solution. The results are shown in Table 2.
- Example 7 An optical laminate was obtained and evaluated in the same manner as in Example 1 except that the acrylic resin (A-1) solution was changed to an acrylic resin (A-3) solution. The results are shown in Table 2.
- Example 8 An optical laminate was obtained and evaluated in the same manner as in Example 1 except that the acrylic resin (A-1) solution was changed to the acrylic resin (A-4) solution. The results are shown in Table 2.
- the optical laminates obtained for Examples 5 to 8 were evaluated in the same manner as the optical laminates obtained in Examples 1 to 4 in the above [Evaluation by simulation], and the light extraction amount was obtained.
- the obtained light extraction amount was compared with the light extraction amount obtained in Comparative Example 1 to determine the light extraction efficiency.
- the obtained results are shown in Table 2.
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Abstract
Description
<2>前記アクリル系粘着剤組成物は、無機酸化物(B)を含有する、<1>に記載の光学積層体。
<3>前記無機酸化物(B)は、その体積平均粒子径が5nm~50nmの粒子であり、かつ前記アクリル系粘着剤組成物は前記アクリル系樹脂100重量部に対して前記無機酸化物(B)を80~130重量部含有する、<2>に記載の光学積層体。
<4>前記アクリル系粘着剤組成物は、架橋剤(C)を含有する、<1>~<3>のいずれか1項に記載の光学積層体。
<5>前記アクリル系粘着剤組成物は、可塑剤(D)を含有する、<1>~<4>のいずれか1項に記載の光学積層体。
<6>前記アクリル系粘着剤組成物は、前記可塑剤(D)を、前記アクリル系樹脂(A)100重量部に対して5~20重量部含有する<5>に記載の光学積層体。
<7>前記可塑剤(D)は、その融点が0℃以下である、<5>又は<6>に記載の光学積層体。
<8>前記可塑剤(D)は、エステル系可塑剤からなる群から選択される、<5>~<7>のいずれか1項に記載の光学積層体。
<9>前記可塑剤(D)は、安息香酸エステルである、<8>に記載の光学積層体。
<10>前記基材の屈折率n3と前記粘着層の屈折率n2との差(n3-n2)が0.02以下である、<1>~<9>のいずれか1項に記載の光学積層体。
<11>前記粘着層の屈折率n2と前記ガラスの屈折率n1との差(n2-n1)が0.02以下である、<1>~<10>のいずれか1項に記載の光学積層体。
<12>前記粘着層の屈折率n2が1.53以上である、<1>~<11>のいずれか1項に記載の光学積層体。
<13>前記基材上に形成される凹凸構造層をさらに備える、<1>~<12>のいずれか1項に記載の光学積層体。
<14>ガラス製の発光面を有する面発光体と、<1>~<13>のいずれか1項に記載の光学積層体と、を備え、前記発光面に前記粘着層が貼付されている、面光源装置。
なお、本願において、「溶媒」の文言は、記述の便宜上、その中に溶質が溶解される、溶液を構成する媒体のみならず、その中に分散物が分散される、懸濁液(スラリーを含む)を構成する媒体をも含むものとして用いられる。本願において、ある物質と他のある物質との「相溶性」とは、それらの物質と、必要に応じて溶媒とを混合して溶液又は懸濁液とした際に、これらがゲル化又は分離を起こさず均質な状態を保つ性質をいう。また、本発明において、(メタ)アクリルとは、アクリルおよびメタクリルを包含する用語であり、(メタ)アクリロイルとはアクリロイルおよびメタクリロイルを包含する用語であり、(メタ)アクリレートとは、アクリレートおよびメタクリレートを包含する用語であり、アクリル系樹脂とは、(メタ)アクリル系モノマーを少なくとも1種含有するモノマー成分を重合して得られる樹脂を意味する。
本発明の光学積層体は、基材と、基材上に形成される粘着層とを備える。光学積層体は、シートまたはフィルム状に形成されている。
基材を構成する材料としては、特に限定されないが、有機EL素子を含む面発光体のガラス製の発光面上に積層して用いられるため、透明性を有する必要があり、通常、透明樹脂を含む樹脂組成物を用いることができる。透明樹脂が「透明」であるとは、光学部材として用いるのに適した程度の光線透過率を有する意味である。本実施形態において、光学積層体を構成する粘着層や基板、後述するその他の層は、光学積層体全体として80%以上の全光線透過率を有するように適宜構成することができる。「ガラス製の発光面」とは、発光する最外層としてガラス製の層を有する面発光体の発光面である。
また、基材の屈折率n3は、通常1.53以上であり、好ましくは1.60以上である。
基材の屈折率n3は、面発光体の発光面となるガラスの屈折率をn1とし、粘着層の屈折率をn2とした際に、n3≧n2≧n1の関係を満たす。この中でも、基材の屈折率n3と粘着層の屈折率n2との差(n3-n2)が0.05以下であることが好ましく、0.02以下であることがより好ましい。屈折率の差を前記範囲とすることにより、界面でのロスを減らすことができ、光の取り出し効率をより一層高めることができる。なお、基材は、単層体として又は2種以上が積層された複層体として用いることができる。
粘着層は、アクリル系樹脂(A)を含むアクリル系粘着剤組成物により構成される。
アクリル系樹脂(A)は、芳香環含有モノマー(a1)40~93重量%、水酸基含有モノマー(a2)7~60重量%を必須成分として含有する共重合成分[I]を共重合してなるものであり、共重合成分[I]は、必要に応じて(メタ)アクリル酸アルキルエステル系モノマー(a3)、その他の共重合性モノマー(a4)を含むものであってもよい。
なお、分散度の下限は、製造の限界の点から、通常1.1である。
1/Tg=Wa/Tga+Wb/Tgb+・・・Wn/Tgn
Tg:共重合体のガラス転移温度(K)
Tga:モノマーAのホモポリマーのガラス転移温度(K)
Wa:モノマーAの重量分率
Tgb:モノマーBのホモポリマーのガラス転移温度(K)
Wb:モノマーBの重量分率
Tgn:モノマーNのホモポリマーのガラス転移温度(K)
Wn:モノマーNの重量分率
(Wa+Wb+・・・+Wn=1)
無機酸化物(B)は、比較的屈折率が高いため、粘着層の高屈折率化を図る目的で、粘着力を損なわない範囲で添加することが好ましい。無機酸化物(B)としては、特に制限はないが、金属酸化物が好ましい。その中でも、金属酸化物と、その表面を修飾する、反応性官能基を有する有機物とを含む粒子、より具体的には、金属酸化物の粒子と当該粒子の表面を修飾する、反応性官能基を有する有機物とを含む被覆粒子(以下、反応性修飾金属酸化物粒子ともいう)が好ましい。反応性官能基は、金属酸化物と、水素結合等の相互作用を有した状態にあってもよいし、そのような状態になく別物質と相互作用できる状態にあってもよい。前記無機酸化物(B)は、微粒子状態である無機酸化物微粒子であることが好ましく、さらに無機酸化物微粒子の態様としては、たとえば、微粒子粉体、ペーストまたはゾルを挙げることができるが、好ましくはゾルである。
可塑剤(D)は、アクリル系粘着剤組成物の粘度を下げ、粘着性を保持するために用いうる。即ち、アクリル系粘着剤組成物は、粒子、特に反応性修飾金属酸化物粒子を含有することにより粘度が高くなり、その結果粘着性が低下しうるが、この場合可塑剤(D)を添加することにより、粘着性を保持することができる。その結果、高い屈折率と高い粘着性とを両立することが可能となる。前記可塑剤(D)は、融点が0℃以下であることが好ましく、-10℃以下であることがより好ましい。融点の下限は、-70℃以上であることが好ましく、-60℃以上であることがより好ましい。可塑剤(D)の融点が、この範囲内であると、相溶性に優れ、かつ被着体への糊残りもなく、また適度の粘着性を有するという利点がある。
前記アクリル系粘着剤組成物は、必要に応じて任意の成分を含有しうる。かかる任意の成分の例としては、シランカップリング剤、光拡散粒子、及び溶媒を挙げることができる。
光拡散層は、構成する材料に光拡散性のある材料を配合することにより実現できる。光拡散層を透過する光を拡散させ、光の光路を変化させることができ、光路長を長くすることにより、光の取り出し効率をより高めることができる。
本発明の面光源装置は、ガラス製の発光面を有する面発光体と、前記光学積層体とを備え、前記発光面上に前記粘着層が貼付された構成である。面発光体としては、有機EL素子を含んでなる面発光体を用いることができる。前記積層体を構成する粘着層は、透明性が高いことにより、特に有機EL素子の電極を透明にすることで、面発光体の向こう側が見渡せるシースルータイプの面光源装置において好適に使用できる。
<アクリル系樹脂(A-1)の製造>
温度計、攪拌機、滴下ロート及び還流冷却器を備えた反応器内にメチルエチルケトン28部、トルエン8部を仕込み、攪拌しながら昇温し、90℃になった後フェノキシエチルアクリレート(a1)70部、2-ヒドロキシエチルアクリレート(a2)15部、ブチルアクリレート(a3)15部に、重合開始剤としてアゾビスイソブチロニトリル(AIBN))0.16部を溶解させた混合物を2時間にわたって滴下した。さらに重合途中に、酢酸エチル2部にAIBN0.06部を溶解させた重合触媒液を逐次追加しながら7時間重合させ、アクリル系樹脂(A-1)溶液(固形分濃度65.0%、粘度1100mPa・s(25℃)、重量平均分子量108,200、数平均分子量41,700、分散度2.59、ガラス転移温度-26.6℃)を得た。
<アクリル系樹脂(A-2)の製造>
温度計、攪拌機、滴下ロート及び還流冷却器を備えた反応器内にメチルエチルケトン28部、トルエン8部を仕込み、攪拌しながら昇温し、90℃になった後フェノキシエチルアクリレート(a1)70部、2-ヒドロキシエチルアクリレート(a2)28部、ブチルアクリレート(a3)2部に、重合開始剤としてアゾビスイソブチロニトリル(AIBN))0.16部を溶解させた混合物を2時間にわたって滴下した。さらに重合途中に、酢酸エチル2部にAIBN0.06部を溶解させた重合触媒液を逐次追加しながら7時間重合させ、アクリル系樹脂(A-2)溶液(固形分濃度65.1%、粘度2,500mPa・s(25℃)、重量平均分子量126,000、数平均分子量48,000、分散度2.63、ガラス転移温度-20.8℃)を得た。
<アクリル系樹脂(A-3)の製造>
温度計、攪拌機、滴下ロート及び還流冷却器を備えた反応器内にメチルエチルケトン28部、トルエン8部を仕込み、攪拌しながら昇温し、90℃になった後、ベンジルアクリレート(a1)70部、2-ヒドロキシエチルアクリレート(a2)15部、ブチルアクリレート(a3)15部に、重合開始剤としてアゾビスイソブチロニトリル(AIBN))0.16部を溶解させた混合物を2時間にわたって滴下した。さらに重合途中に、酢酸エチル2部にAIBN0.06部を溶解させた重合触媒液を逐次追加しながら7時間重合させ、アクリル系樹脂(A-3)溶液(固形分濃度65.1%、粘度1300mPa・s(25℃)、重量平均分子量105,000、数平均分子量36,000、分散度2.92、ガラス転移温度-8.3℃)を得た。
<アクリル系樹脂(A-4)の製造>
温度計、攪拌機、滴下ロート及び還流冷却器を備えた反応器内にメチルエチルケトン28部、トルエン8部を仕込み、攪拌しながら昇温し、90℃になった後フェノキシエチルアクリレート(a1)70部、2-ヒドロキシエチルアクリレート(a2)15部、ブチルアクリレート(a3)14.8部、アクリル酸(a)0.2部に、重合開始剤としてアゾビスイソブチロニトリル(AIBN))0.16部を溶解させた混合物を2時間にわたって滴下した。さらに重合途中に、酢酸エチル2部にAIBN0.06部を溶解させた重合触媒液を逐次追加しながら7時間重合させ、アクリル系樹脂(A-4)溶液(固形分濃度65%、粘度3,000mPa・s(25℃)、重量平均分子量99,500、数平均分子量36,800、分散度2.70、ガラス転移温度-26.4℃)を得た。
(評価基準)
A・・・配合後すぐに相溶し、かつ室温で10日放置した時点でも相溶していた
B・・・配合後一旦は相溶したが、室温に放置で10日以内に相溶しなくなった(分離した、ゲル化した)
C・・・相溶しなかった(ゲル化した)
以上の測定結果を表1に示す。
製造例1~4で得られたアクリル系樹脂(A-1)、(A-2)、(A-3)及び(A-4)を用いて得られた、粘着層付きPETフィルムから、離型シートを剥離し、(粘着層)/(PETフィルム)の層構成を有する複層物(光学積層体)とした。この複層物の粘着層側の面を、面発光体を形成するためのガラス基板(屈折率n1=1.53)に貼付して、積層体01~04を得た。
実施例1((A-1)を用いた例)においては、ガラスの屈折率n1、粘着層の屈折率n2、およびPETフィルム(基材)の屈折率n3は、n3=1.65、n2=1.53、及びn1=1.53であり、n3≧n2≧n1の関係を満たしていた。
アクリル系粘着剤(サイデン化学株式会社製、商品名「X-311033S」、固形分35%)のアクリル系樹脂100部に対して、トリメチロールプロパンのトリレンジイソシアネート付加物の55%酢酸エチル溶液(日本ポリウレタン社製、「コロネートL-55E」)0.5部を配合し、粘着剤組成物とした。この粘着剤組成物の相溶性を、製造例1~4の組成物の評価と同様に評価した。結果を表1に示す。
この粘着剤組成物を、ポリエステル系離型シートに、乾燥後の厚みが40μmとなるように塗布し、80℃で5分乾燥し、粘着層を形成した。これにより、(離型シート)/(粘着層)の層構成を有する2層の複層物を得た。その後、この複層物の粘着層側の面に、ポリエステル系離型シートを貼り合わせ、(離型シート)/(粘着層)/(離型シート)の層構成を有する、3層の複層物を得た。これを、40℃の条件下で10日間エージングさせて両面粘着シートを得た。この粘着シートを用いて、粘着層の屈折率を測定したところ、n=1.48であった。また、この粘着層の剥離強度を、製造例1~4の組成物で得た粘着層の評価と同様に評価した。結果を表1に示す。
次に、前記両面粘着シートの粘着層から一方の面の離型シートを剥がし、(離型シート)/(粘着層)の層構成を有する、2層の複層物とした。この複層物の粘着層側の面を、100μmポリエチレンテレフタレート(PET)フィルムに押圧した。これにより、(離型シート)/(粘着層)/(PETフィルム)の層構成を有する、粘着層付きPETフィルムを得た。得られた粘着層付きPETフィルムから、離型シートを剥離し、(粘着層)/(PETフィルム)の層構成を有する複層物(光学積層体)とした。この複層物の粘着層側の面を、面発光体を形成するためのガラス基板(n=1.53)に貼付して、積層体05を得た。ガラスの屈折率n1、粘着層の屈折率n2、およびPETフィルム(基材)の屈折率n3は、n1=1.63、n2=1.48及びn3=1.53であり、従ってn3≧n1≧n2の関係を有しており、n3≧n2≧n1の関係を満たしていなかった。
実施例1~4並びに比較例1で得られた積層体01~05を備える、面光源装置01~05をモデル化したものについて、プログラム(プログラム名:ASAP、breault Reserch社製)を用いた光学シミュレーションで、光取り出し量を求めた。
モデル化した積層構造は、装置出光面側から、フィルム(厚み100μm)、粘着層(厚み10μm)、ガラス基板(厚み0.7mm、屈折率1.63)、透明電極(厚み100nm、屈折率1.9)、発光層(厚み20nm、屈折率1.7)、反射電極(厚み100nm、屈折率1.5、反射率85%)、封止基板(厚み0.7mm、屈折率1.52)とした。
フィルム及び粘着層の屈折率は、各実施例及び比較例に応じて設定し、透明電極の装置出光面側の面を発光面とし、発光面の光度は1ルーメンとした。
(5-1.アクリル系粘着剤組成物)
製造例1で得られたアクリル系樹脂(A-1)溶液の100部(固形分相当量)と、無機粒子として、酸化ジルコニウム粒子分散液(ソーラー社製NANON5 ZR-010 体積平均粒子径15nm)122部(固形分相当量)と、可塑剤(BENZOFLEX 9-88SG」(イーストマン社製))融点-30℃)14部と、光拡散粒子(体積平均粒子径を0.7μmとしたシリコーン粒子、モメンティブ・パフォーマンス・マテリアル社製、商品名「XC-99」8.47部とを加え15分攪拌し、アクリル系粘着剤組成物を得た。得られた組成物の相溶性を目視で確認したところ、相溶性は問題なく(分離及びゲル化が観察されず)、良好であった。
得られたアクリル系粘着剤組成物のアクリル系樹脂100部に対して、トリメチロールプロパンのトリレンジイソシアネート付加物の55%酢酸エチル溶液(日本ポリウレタン社製、「コロネートL-55E」)0.5部を配合し、混合物とした。この混合物を、基材としての100μm厚みのポリエチレンテレフタレートフィルム(東レ製、商品名「U34」)の片面に、乾燥後の厚みが40μmとなるように塗布し、80℃で5分乾燥し、粘着層を形成した。これにより、(粘着層)/(基材)の層構成を有する2層の複層物を得た。その後、この複層物の粘着層側の面に、ポリエステル系離型シートを貼り合わせ、(離型シート)/(粘着層)/(基材)の層構成を有する、3層の複層物を得た。これを、40℃の条件下で10日間エージングさせて粘着層および基材を有する光学積層体を得た。
(5-2)で得られた光学積層体を幅25mm、長さ100mmに切り出し、離型シートを剥離し、ローラーを用いてガラス板に貼合し、(基材)/(粘着層)/(ガラス板)の層構成を有する複層物を得た。貼合から24時間経過後、ピール試験機を用いて、速度20mm/分、90°の条件で、基材をガラス板から剥離し、長さ方向のピール強度を測定した。結果を表2に示す。
(5-1)で得られたアクリル系粘着剤組成物を、ガラス板の片面に、乾燥後の厚みが20μmとなるように塗布し、80℃で5分乾燥させて、屈折率測定用の粘着層を形成した。この粘着層の屈折率を、エリプソメーター(ジェー・エー・ウーラム・ジャパン株式会社製 M-2000)にて測定した。結果を表2に示す。
アクリル系樹脂(A-1)溶液をアクリル系樹脂(A-2)溶液に変更した以外は、実施例1と同様にして光学積層体を得て評価した。結果を表2に示す。
アクリル系樹脂(A-1)溶液をアクリル系樹脂(A-3)溶液に変更した以外は、実施例1と同様にして光学積層体を得て評価した。結果を表2に示す。
アクリル系樹脂(A-1)溶液をアクリル系樹脂(A-4)溶液に変更した以外は、実施例1と同様にして光学積層体を得て評価した。結果を表2に示す。
Claims (14)
- 基材と、この基材上に形成される粘着層と、を備え、ガラス製の発光面上に前記粘着層側を貼付して用いられる光学積層体であって、
前記発光面を構成するガラスの屈折率をn1とし、前記粘着層の屈折率をn2とし、前記基材の屈折率をn3として、n3≧n2≧n1の関係を満たし、
前記粘着層は、アクリル系樹脂(A)を含むアクリル系粘着剤組成物により構成され、
前記アクリル系樹脂(A)は、芳香環含有モノマー(a1)40~93重量%と、水酸基含有モノマー(a2)7~60重量%とを含む共重合成分[I]の共重合体であって、かつその重量平均分子量が20万以下である、光学積層体。 - 前記アクリル系粘着剤組成物は、無機酸化物(B)を含有する、請求項1に記載の光学積層体。
- 前記無機酸化物(B)は、その体積平均粒子径が5nm~50nmの粒子であり、かつ前記アクリル系粘着剤組成物は前記アクリル系樹脂100重量部に対して前記無機酸化物(B)を80~130重量部含有する、請求項2に記載の光学積層体。
- 前記アクリル系粘着剤組成物は、架橋剤(C)を含有する、請求項1~3のいずれか1項に記載の光学積層体。
- 前記アクリル系粘着剤組成物は、可塑剤(D)を含有する、請求項1~4のいずれか1項に記載の光学積層体。
- 前記アクリル系粘着剤組成物は、前記可塑剤(D)を、前記アクリル系樹脂(A)100重量部に対して5~20重量部含有する、請求項5に記載の光学積層体。
- 前記可塑剤(D)は、その融点が0℃以下である、請求項5または6に記載の光学積層体。
- 前記可塑剤(D)は、エステル系可塑剤からなる群から選択される、請求項5~7のいずれか1項に記載の光学積層体。
- 前記可塑剤(D)は、安息香酸エステルである、請求項8に記載の光学積層体。
- 前記基材の屈折率n3と前記粘着層の屈折率n2との差(n3-n2)が0.02以下である、請求項1~9のいずれか1項に記載の光学積層体。
- 前記粘着層の屈折率n2と前記ガラスの屈折率n1との差(n2-n1)が0.02以下である、請求項1~10のいずれか1項に記載の光学積層体。
- 前記粘着層の屈折率n2が1.53以上である、請求項1~11のいずれか1項に記載の光学積層体。
- 前記基材上に形成される凹凸構造層をさらに備える、請求項1~12のいずれか1項に記載の光学積層体。
- ガラス製の発光面を有する面発光体と、請求項1~13のいずれか1項に記載の光学積層体と、を備え、前記発光面に前記粘着層が貼付されている、面光源装置。
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JP2016188282A (ja) * | 2015-03-30 | 2016-11-04 | 日本合成化学工業株式会社 | 可塑剤含有部材貼り合せ用アクリル系粘着剤、並びに粘着テープ |
JP2017014376A (ja) * | 2015-06-30 | 2017-01-19 | 日本ゼオン株式会社 | 光学部材用粘着剤組成物、光学積層体及び面光源装置 |
JP2017077687A (ja) * | 2015-10-21 | 2017-04-27 | リンテック株式会社 | ウインドーフィルム |
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WO2018070480A1 (ja) * | 2016-10-14 | 2018-04-19 | 株式会社クラレ | ガラス積層体 |
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CN105848879A (zh) | 2016-08-10 |
EP3088924A4 (en) | 2017-08-09 |
JP6508060B2 (ja) | 2019-05-08 |
JPWO2015098714A1 (ja) | 2017-03-23 |
KR20160102433A (ko) | 2016-08-30 |
US9624405B2 (en) | 2017-04-18 |
US20160326405A1 (en) | 2016-11-10 |
EP3088924A1 (en) | 2016-11-02 |
CN105848879B (zh) | 2018-05-11 |
EP3088924B1 (en) | 2018-09-19 |
KR102317623B1 (ko) | 2021-10-25 |
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