KR101643511B1 - Photocurable resin composition for laminating optically functional material - Google Patents

Abstract

SUMMARY OF THE INVENTION It is an object of the present invention to provide a transparent plate and a transparent plate on which a transparent electrode is formed on a capacitive touch panel by joining a transparent plate and an icon sheet, Curable adhesive composition capable of bonding a display body and an optically functional material which can be bonded without incorporating the optically functional material, or when the optically functional material is bonded to the display body, the adhesive surface is peeled or the glass of the display body is not broken, Resin composition. (Meth) acrylate oligomer having (A) a polyisoprene, a polybutadiene or a polyurethane skeleton and (B) a softening component, and further comprising (C) phenoxyethyl (meth) acrylate (Meth) acrylate monomer (C1) or a thiol compound (meth) acrylate selected from phenoxypolyethylene glycol (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, and cyclohexyl C2), and the cured product are within the predetermined range in the modulus of elasticity and elongation at break.

Description

TECHNICAL FIELD [0001] The present invention relates to a photocurable resin composition for bonding optical functional materials,

(Meth) acrylate oligomer having a polyisoprene, polybutadiene or polyurethane skeleton and a softening component, a photocurable adhesive composition for bonding a touch panel comprising the (meth) acrylate oligomer, the softening component and a specific ) Acrylate monomer or a thiol compound, and the cured product thereof has a specific modulus of elasticity and elongation at break, and a touch panel or a display panel bonded thereto.

A touch panel mounted on a display body such as an LCD includes a resistive film, a capacitance type, an electromagnetic induction type, and an optical type. On these touch panels, there is a case where an icon sheet such as a decorated plate for designing an appearance or a touch position is designated. The capacitive touch panel has a structure in which a transparent electrode is formed on a transparent substrate and a transparent plate is bonded on the transparent electrode.

Conventionally, the above-described joining of the screen and the touch panel, the joining of the icon sheet and the touch panel, and the joining of the transparent substrate and the transparent plate on which the transparent electrode is formed in the capacitive touch panel, Or one side of the adherend was subjected to adhesive processing. In the technique using such a sticking material, there is a problem that the adhesion is insufficient or air bubbles are mixed in the bonding surface. Particularly, if the bonding surface is subjected to printing processing, there is a problem that air bubbles are likely to remain at the stepped portion between the printed portion and the non-printed portion.

In addition, recently, the glass of a display body such as an LCD has become thinner. If the glass is thin, the external stress causes the LCD to be easily deformed. In the case of joining an optical functional material such as an acrylic plate or a polycarbonate plate to a display body such as an LCD of such a thin glass, a difference in linear expansion between glass and acryl or a difference in thermal expansion coefficient between a plastic molding material such as an acrylic plate or polycarbonate The distortion during molding causes a reduction in molding strain and moisture absorption / drying in the heat resistance test and the humidity resistance test, resulting in a change in surface precision such as dimensional change and warpage. In the conventional adhesive (for example, Patent Document 1), if the deformation is suppressed, there is a problem that the adhesive surface is peeled off, the LCD is broken, or the display of the LCD is uneven.

Japanese Patent Application Laid-Open No. 2004-77887

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method for bonding a transparent plate or an icon sheet on a touch panel or a transparent substrate having a transparent electrode formed thereon in a capacitive touch panel, It is difficult to bond the optical functional material to an optical functional material without bonding the optical functional material to the display body, or when the optical functional material is bonded to the display body, the adhesive surface is peeled off or the glass of the display body is broken. Provided.

The present inventors have found that by containing a (meth) acrylate oligomer having a polyisoprene, polybutadiene or polyurethane skeleton and a softening component in the photocurable adhesive composition, or by additionally containing (meth) acrylate oligomer and a (Meth) acrylate monomer or a thiol compound, and setting the elastic modulus and elongation at break of the cured product within a specific range, the present inventors have accomplished the present invention.

The first invention is a photocurable adhesive composition for touch panel bonding comprising (A) a (meth) acrylate oligomer having a skeleton of polyisoprene, polybutadiene or polyurethane, and (B) a softening component.

Further, the present invention is a bonded body of a transparent substrate and a transparent plate on which a transparent electrode is formed in a capacitive touch panel, or a bonded body of a touch panel, sheet or plate bonded with the above-mentioned photo-curable adhesive composition for bonding a touch panel .

(A) a (meth) acrylate oligomer having a polyisoprene, polybutadiene or polyurethane skeleton, (B) a softening component and (C1) phenoxyethyl (meth) acrylate, phenoxypolyethylene glycol (Meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, cyclohexyl (meth) acrylate, nonylphenol EO adduct (meth) acrylate, methoxy triethylene glycol And a (meth) acrylate monomer selected from tetrahydrofurfuryl (meth) acrylate, wherein the modulus of elasticity of the cured product is less than 12 kPa and the fracture of the cured product And the retardation is 300% or more.

A third aspect of the present invention is a method for producing an optical functional material, comprising the steps of (A) bonding a display material and an optical functional material, which comprises (meth) acrylate oligomer having polyisoprene, polybutadiene or polyurethane skeleton, (B) Wherein the cured product has a modulus of elasticity of less than 10 kPa and an elongation at break of the cured product of not less than 300%. The elastic modulus of the cured product is preferably 1 kPa or more, and the elongation at break of the cured product is preferably 1000% or less.

Further, the present invention is a display panel comprising a display body and an optically functional material bonded by the above-mentioned second or third photo-curable resin composition.

According to the first aspect of the present invention, when a transparent plate or an icon sheet is bonded on a touch panel or a transparent substrate on which a transparent electrode is formed on a capacitive touch panel is bonded to a transparent plate, It can be bonded without.

According to the second and third aspects of the present invention, when the display body and the optically functional material are bonded, there is no case where the adhesive surface is peeled off or the glass of the display body is broken.

First invention

The first invention is a photocurable adhesive composition for touch panel bonding comprising (A) a (meth) acrylate oligomer having a skeleton of polyisoprene, polybutadiene or polyurethane, and (B) a softening component.

Component (A) of the present invention is a (meth) acrylate oligomer having a skeleton of polyisoprene, polybutadiene or polyurethane. These (meth) acrylate oligomers may be used alone or in combination of two or more.

The (meth) acrylate oligomer having a polyisoprene skeleton is also referred to as a (meth) acrylic-modified polyisoprene, and preferably has a molecular weight of 1000 to 100000, more preferably 100000 to 50000. As a commercially available product, there is, for example, "UC-1" (molecular weight 25,000) manufactured by Kuraray Co.,

The (meth) acrylate oligomer having a polybutadiene skeleton is also referred to as a (meth) acryl-modified polybutadiene, and preferably has a molecular weight of from 500 to 100,000, more preferably from 1,000 to 30,000. As a commercially available product, there is, for example, "TE2000" (molecular weight 2000) manufactured by Nihon Sekishiki.

The (meth) acrylate oligomer having a polyurethane skeleton is also referred to as a (meth) acryl-modified polyurethane, and preferably has a molecular weight of 1,000 to 100,000, more preferably 10,000 to 50,000. As a commercially available product, there is "UA-1" manufactured by Light Chemical Co., for example.

As the (meth) acrylate oligomer of the component (A), a (meth) acrylate oligomer having a polyisoprene skeleton is particularly preferable.

Component (B) of the present invention is a softening component. Examples of the softening component include a polymer, an oligomer, a phthalic acid ester, and a castor oil which are compatible with the component (A). As the oligomer or polymer, a polyisoprene-based, polybutadiene-based or xylene-based oligomer or polymer can be exemplified. These softening ingredients are commercially available from Kuraray as LIR series and Degussa as polyol series. These softening components may be used alone or in combination of two or more.

In the photo-curable adhesive composition for bonding a touch panel of the present invention, the component (B) is preferably 10 to 400 parts by mass, more preferably 50 to 300 parts by mass, and most preferably, Is 100 to 300 parts by mass.

The photo-curable adhesive composition for bonding a touch panel of the present invention preferably further comprises (C) a specific (meth) acrylate monomer (C1) or a thiol compound (C2).

The specific (meth) acrylate monomer (C1) is at least one monomer selected from the group consisting of phenoxyethyl (meth) acrylate (PO), phenoxypolyethylene glycol (meth) acrylate, Acrylate, cyclohexyl (meth) acrylate (CH), nonylphenol EO adduct (meth) acrylate, methoxy triethylene glycol (meth) acrylate and tetrahydrofurfuryl (meth) acrylate. These (meth) acrylate monomers may be used alone or in combination of two or more. Component (C1) is a component for imparting elongation to the cured product.

Component (C2) of the present invention is a thiol compound. As the thiol compound, for example, tridecyl mercaptopropionate, methoxybutyl mercaptopropionate, octyl mercaptopropionate, trimethylolpropane tristypropionate, pentaerythritol tetrakisthiopropionate, dipentaerythritol hexakis (3-mercaptopropionate), tris [(3-mercaptopropionyloxy) -ethyl] isocyanurate and 3-mercaptobutyrate derivatives. These thiol compounds may be used alone or in combination of two or more.

Component (C2) is preferably a 3-mercaptobutyrate derivative such as 1,4-bis (3-mercaptobutyryloxy) butane, 1,3,5-tris (3-mercaptobutyloxy Ethyl) -1,3,5-triazine-2,4,6- (1H, 3H, 5H) -thione, pentaerythritol tetrakis (3-mercaptobutyrate), trimethylolpropane tris Mercaptopropionate), and the like. These thiol compounds are commercially available from Showa Denko Kasei under the trade names of CarLens MT BD1, Car lens MT PE1, Car lens MT NR1, and Sakaikagaku under the trade name TMMP.

In the photo-curable adhesive composition for bonding a touch panel of the present invention, the amount of the component (C1) is preferably 1 to 100 parts by mass, more preferably 5 to 50 parts by mass, per 100 parts by mass of the component (A). The component (C2) is preferably 0.05 to 100 parts by mass, more preferably 0.1 to 10 parts by mass, per 100 parts by mass of the component (A).

The photocurable adhesive composition for bonding a touch panel of the present invention contains a general (meth) acrylate monomer other than the component (C1) as a reaction diluent when the compatibility of the components is poor, or when the viscosity is high and the workability is poor . As typical (meth) acrylate monomers, for example, 2-ethylhexyl (meth) acrylate, n-butyl (meth) acrylate, i- (Meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (Meth) acrylate, benzyl (meth) acrylate, phenyl (meth) acrylate, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di Butylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, Hexanediol di (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, There can be mentioned a methacrylate, norbornene (meth) acrylate. These (meth) acrylates may be used alone or in combination of two or more.

The photo-curable adhesive composition for touch panel bonding of the present invention may further comprise a photoinitiator. As the photoinitiator, a common initiator can be used, and examples thereof include 1- [4- (2-hydroxyethoxy) phenyl] -2-hydroxy-2-methyl- Cyclohexyl-phenyl-ketone, benzophenone, 2,2-dimethoxy-1,2-diphenylethan-1-one, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 2,4,6 1-phenyl-2-methyl-1-phenyl-propane-1, 2-dicarboxylic acid, Methyl-1- [4-methylthio] phenyl] -2-morpholinopropane-1-one, benzoin methyl ether, benzoin ethyl ether, benzoin isobutyl ether, benzoin isopropyl ether , 2-hydroxy-2-methyl- [4- (1-methylvinyl) phenyl] propanol oligomer, bis- (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, Propanol oligomer, 2-hydroxy-2-methyl-1-phenyl-1-propanone, isopropyl thioxanthone, o Benzoyl benzoate, methyl benzoyl benzoate, [4- (methylphenylthio) phenyl] phenyl methane, 2,4-diethyl thioxanthone, 2-chlorothioxanthone, benzophenone, ethyl anthraquinone, benzophenone ammonium salt, Bis (2,6-dimethoxybenzoyl) -2,4,4-trimethyl-pentylphosphine oxide, bis (2,6-dimethoxybenzoyl) 4-methylbenzophenone, 4,4'-bisdiethylaminobenzophenone, 1,4-dibenzoylbenzene, 10-butyl-2-chloroacridone, 2,2'- Bis (o-chlorophenyl) 4,5,4 ', 5'-tetrakis (3,4,5-trimethoxyphenyl) 1,2'-biimidazole, 2,2'- Phenyl) 4,5,4 ', 5'-tetraphenyl-1,2'-biimidazole, 2-benzoylnaphthalene, 4-benzoylbiphenyl, 4-benzoyldiphenyl ether, acrylated benzophenone, Yl) -bis (2,6-difluoro-3- (1H-pyrrol-1-yl) -phenyl) titanium, o-methylbenzoylbenzoate, p- Benzo Ethyl ester, p-dimethylaminobenzoic acid isoamylethyl ester, active tertiary amine, carbazole-phenone-based photopolymerization initiator, acridine-based photopolymerization initiator, triazine-based photopolymerization initiator and benzoyl-based photopolymerization initiator . One or more of these photoinitiators may be used. The amount of the photoinitiator is 0.1 to 10 parts by mass based on 100 parts by mass of the component (A).

In the present invention, preferred examples of the photoinitiator include 2,4,6-trimethylbenzoyl phenyl ethoxyphosphine oxide and 1-hydroxy-cyclohexyl-phenyl-ketone, each of which can be used singly, It is possible.

The photocurable adhesive composition of the present invention may further contain an adhesion imparting agent. Examples of the tackifier include silane coupling agents such as vinyltrimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3- 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3- Methacryloxypropyltriethoxysilane, 3-acryloxypropyltrimethoxysilane, N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, N- Aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropyltriethoxysilane, N-2- (aminoethyl) Silane, 3-triethoxysilyl-N- (1,3-dimethyl-butylidene) propylamine, N-phenyl-3-aminopropyltrimethoxysilane , 3-ureidopropyltriethoxysilane, 3-chloropropyltrimethoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltrimethoxysilane, bis (triethoxysilylpropyl) Feed, 3-isocyanatepropyltriethoxysilane, and the like. One or more of these adhesion-imparting agents may be used. The amount of the adhesion-imparting agent is 0.01 to 10 parts by mass, preferably 0.5 to 5 parts by mass, per 100 parts by mass of the component (A).

The photocurable adhesive composition of the present invention may further contain an antioxidant. Examples of the antioxidant include BHT, 2,4-bis- (n-octylthio) -6- (4-hydroxy-3,5-di-t-butyl anilino) -1,3,5- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], 2,2-thio-diethylenebis [3- (3-t-butyl-5-methyl-4-hydroxyphenyl) propionate], 1,6-hexane (3,5-di-t-butyl-4-hydroxyphenyl) propionate], octadecyl-3- Propionate, N, N'-hexamethylenebis (3,5-di-t-butyl-4-hydroxy-hydrosinnamide), 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) -isocyanurate, octylated diphenylamine, 2, 4, -bis [(octylthio) methyl] -O-cresol, isooctyl-3- (3,5-di-t- butyl-4-hydroxyphenyl) propionate, dibutylhydroxide Cytoluene can be exemplified. These antioxidants may be used alone or in combination of two or more. The amount of the antioxidant is 0.01 to 10 parts by mass, preferably 0.5 to 5 parts by mass based on 100 parts by mass of the component (A).

When the light does not reach a part of the adhesive composition applied to the adhesive surface due to the structure of the optically functional material of the present invention, the place where the light reaches is cured with light, The adhesive composition may be a combination type of a combination of photo-curing and thermosetting, in which an organic peroxide is added and cured by heat. Examples of the organic peroxide include a ketone peroxide type, peroxyketal type, hydroperoxide type, dialkyl peroxide type, diacyl peroxide type, peroxy ester type, peroxydicarbonate type and the like. These organic oxides may be used alone or in combination of two or more. These organic oxides may be used alone or in combination of two or more. The amount thereof is 0.1 to 10 parts by mass, preferably 1 to 5 parts by mass, based on 100 parts by mass of the component (A).

As curing accelerators for these organic peroxides, naphthenic acid metal complexes, dimethylaniline, quaternary ammonium salts and phosphoric acid esters can be used.

The photo-curable adhesive composition of the present invention is preferably an adhesive for bonding a transparent substrate on which a transparent electrode is formed to a transparent plate in a capacitive touch panel. The material of the transparent substrate is, for example, glass, PC, PMMA, a complex of PC and PMMA, COC and COP. The material of the transparent plate is, for example, glass, PC, PMMA, a complex of PC and PMMA, COC and COP.

The photo-curable adhesive composition of the present invention is preferably an adhesive for bonding a touch panel to a sheet or a plate thereon. Examples of the sheet include an icon sheet, a protective sheet, and a decorative sheet, and the materials thereof are, for example, PET, PC, COC, and COP. As the plate, there are, for example, a luster plate and a protective plate, and the material thereof is, for example, PET, glass, PC, PMMA, a complex of PC and PMMA, COC and COP. The material of the touch panel surface to be bonded to the sheet or plate is, for example, glass, PET, PC, PMMA, a composite of PC and PMMA, COC and COP.

The present invention also relates to a bonded body of a transparent substrate and a transparent plate on which a transparent electrode is formed in a capacitive touch panel, or a bonded body of a touch panel and a sheet or a plate bonded together by the above-described photo-curable adhesive composition.

Second invention

(A) a (meth) acrylate oligomer having a polyisoprene, polybutadiene or polyurethane skeleton, (B) a softening component and (C1) phenoxyethyl (meth) acrylate, phenoxypolyethylene glycol (Meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, cyclohexyl (meth) acrylate, nonylphenol EO adduct (meth) acrylate, methoxy triethylene glycol And a (meth) acrylate monomer selected from tetrahydrofurfuryl (meth) acrylate, wherein the modulus of elasticity of the cured product is less than 12 kPa and the fracture of the cured product And the retardation is 300% or more.

Specific examples of the component (A), the component (B) and the component (C1) of the present invention are as described in the first invention.

The photocurable resin composition of the present invention is for bonding a display body and an optical functional material. Examples of the display member include a display device such as an LCD, an EL display, an EL light, an electronic paper, or a plasma display in which a polarizing plate is attached to a glass. As the optical functional material, an acrylic plate (one side or both sides hard coating treatment or AR coating treatment), a polycarbonate plate, a PET plate, a PEN plate , A reinforced glass (which may have a scattering prevention film attached thereto), and a touch panel input sensor.

The photo-curable resin composition of the present invention has an elastic modulus of less than 12 kPa and a elongation at break of the cured product of 300% or more. When the cured product has such a modulus of elasticity and elongation at break, the photo-curing type resin composition of the present invention has a problem that when the display body and the optical functional material are bonded, the adhesive surface is peeled off, the glass of the display body is broken, There is no case. The elastic modulus and elongation at break of the cured product can be measured by the method described in Examples described later.

In the present invention, the cured product preferably has an elastic modulus of 1 kPa or more and less than 12 kPa, and an elongation at break of the cured product is preferably 300% or more and 700% or less.

The photo-curable resin composition of the present invention is characterized in that the initial transmittance of light of 400 to 800 nm in the cured product is 95% or more, the transmittance is 70% or more after being left at 60 占 폚 and 90% It is preferable that the transmittance after standing for a time is 90% or more.

The refractive index of the cured product of the photo-curable resin composition of the present invention is preferably 1.45 to 1.55.

In the photo-curable resin composition of the present invention, by increasing the proportion of the component (C1) relative to the component (A), the elastic modulus of the cured product can be lowered, the elongation upon breakage of the cured product can be increased, Increasing the weight ratio can lower the elastic modulus of the cured product. Therefore, by controlling the compounding ratio of the component (A), the component (B) and the component (C1), the desired elastic modulus and elongation at break can be imparted to the cured product.

The photo-curable resin composition of the present invention preferably contains 100 parts by mass of the (meth) acrylate oligomer (A), 100 to 400 parts by mass, preferably 100 to 300 parts by mass of the softening component (B) C1) (meth) acrylate monomer in an amount of 1 to 100 parts by mass, preferably 5 to 50 parts by mass.

More preferably, the photo-curing resin composition of the present invention is prepared by mixing polyisoprene methacrylate oligomer (100 parts by mass) as an oligomer of the component (A) with 10 to 300 parts by mass of liquid polybutadiene as a softening component of the component (B) , Preferably 50 to 200 parts by mass, and / or polyisoprene (10 to 300 parts by mass, preferably 50 to 200 parts by mass), and (meth) acrylic monomer of component (C1) as cyclohexyl methacrylate To 100 parts by mass, preferably 5 to 50 parts by mass) and / or phenoxyethyl methacrylate (1 to 100 parts by mass, preferably 5 to 50 parts by mass).

When the compatibility of the component (A) and the component (C1) is poor, or when the viscosity is high and the workability is poor, the photo-curable resin composition of the present invention may contain, as a reaction diluent, a general (meth) acrylate Monomers. As typical (meth) acrylate monomers, for example, 2-ethylhexyl (meth) acrylate, n-butyl (meth) acrylate, i- (Meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (Meth) acrylate, benzyl (meth) acrylate, phenyl (meth) acrylate, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di Butylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, Hexanediol di (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, There can be mentioned a methacrylate, norbornene (meth) acrylate. These (meth) acrylates may be used alone or in combination of two or more.

The photo-curable resin composition of the present invention may further comprise a photoinitiator. As the photoinitiator, the photoinitiator described in the first invention can be used. The amount of the photoinitiator is 0.1 to 10 parts by mass based on 100 parts by mass of the component (A).

The photo-curable resin composition of the present invention may further contain an adhesion-imparting agent. As the adhesion-imparting agent, those described in the first invention can be used. The amount of the adhesion-imparting agent is 0.01 to 10 parts by mass, preferably 0.5 to 5 parts by mass, per 100 parts by mass of the component (A).

The photo-curable resin composition of the present invention may further contain an antioxidant. As the antioxidant, those described in the first invention can be used. The amount of the antioxidant is 0.01 to 10 parts by mass, preferably 0.5 to 5 parts by mass based on 100 parts by mass of the component (A).

The photo-curable resin composition of the present invention can be a resin composition of a combination type of photo-curing and thermosetting as in the first invention. The amount of the organic peroxide is 0.1 to 10 parts by mass, preferably 1 to 5 parts by mass based on 100 parts by mass of the component (A).

As curing accelerators for organic peroxides, naphthenic acid metal complexes, dimethylaniline, quaternary ammonium salts and phosphoric acid esters can be used.

The present invention relates to a display panel comprising a display body and an optically functional material joined together by the above-described photo-curable resin composition, and can be introduced into electronic devices such as televisions, digital cameras, cellular phones, personal computers, have.

Third invention

A third aspect of the present invention is a method for producing an optical functional material, comprising the steps of (A) bonding a display material and an optical functional material, which comprises (meth) acrylate oligomer having polyisoprene, polybutadiene or polyurethane skeleton, (B) Wherein the cured product has a modulus of elasticity of less than 10 kPa and an elongation at break of the cured product of not less than 300%.

Specific examples of the component (A), the component (B) and the component (C2) of the present invention are as described in the first invention.

The photocurable resin composition of the present invention is for bonding a display body and an optical functional material. Examples of the display member include a display device such as an LCD, an EL display, an EL light, an electronic paper, or a plasma display in which a polarizing plate is attached to a glass. Optical functional materials include acrylic plates (which may be coated on one side or both sides with hard coating or AR coating), polycarbonate plates, PET plates, PEN A transparent plastic plate such as a plate, a tempered glass (which may have a scattering prevention film attached thereto), and a touch panel input sensor.

The photo-curable resin composition of the present invention has an elastic modulus of the cured product of less than 10 kPa and an elongation at break of the cured product of 300% or more. By having such a modulus of elasticity and elongation at break of the cured product, when the optically curable resin composition of the present invention is bonded to the optical functional material with the display, when the adhesive surface is peeled off, the glass of the display body is broken or the display is uneven There is no. The elastic modulus and elongation at break of the cured product can be measured by the method described in Examples described later.

In the present invention, the cured product preferably has an elastic modulus of 1 kPa or more and less than 10 kPa, and an elongation at break of the cured product is preferably 300% or more and 700% or less, more preferably 350% or more and 600% or less.

The photo-curable resin composition of the present invention is characterized in that the initial transmittance of light of 400 to 800 nm in a cured product is 95% or more, the transmittance is 70% or more after standing at 60 DEG C and 90% It is preferable that the transmittance after standing is 90% or more.

The refractive index of the cured product of the photo-curable resin composition of the present invention is preferably 1.45 to 1.55.

In the photo-curable resin composition of the present invention, by increasing the ratio of the component (C2) to the component (A), the elastic modulus of the cured product can be lowered, the elongation upon breakage of the cured product can be increased, Increasing the weight ratio can lower the elastic modulus of the cured product. Therefore, by controlling the compounding ratio of the component (A), the component (B) and the component (C2), the desired elastic modulus and elongation at break can be imparted to the cured product.

The photo-curable resin composition of the present invention comprises 100 parts by mass of the (meth) acrylate oligomer (A), 10 to 300 parts by mass, more preferably 100 to 200 parts by mass of the softening component (B) Preferably 0.05 to 100 parts by mass, more preferably 0.1 to 10 parts by mass, of the thiol compound (C2).

The photo-curable resin composition of the present invention is particularly preferably a polyisoprene methacrylate (100 parts by mass) as an oligomer of the component (A), a liquid polybutadiene (10 to 300 parts by mass, (10 to 300 parts by mass, preferably 100 to 200 parts by mass) of the liquid polyisoprene and 100 to 200 parts by mass of the liquid polyisoprene and the thiol compound of the component (C2) ) (0.05 to 100 parts by mass, preferably 0.1 to 10 parts by mass).

The photo-curable resin composition of the present invention may contain a (meth) acrylate monomer in case of poor compatibility or to improve workability. As the (meth) acrylate monomer, those described in the first invention can be used. By adding the (meth) acrylate monomer, the addition amount of the thiol compound and the softening component can be adjusted. The acrylate monomer is added within a range that can impart desired compatibility, but is preferably 1 to 100 parts by mass, more preferably 10 to 50 parts by mass with respect to 100 parts by mass of the component (A).

The photo-curable resin composition of the present invention may further comprise a photoinitiator. As the photoinitiator, those described in the first invention can be used. The amount of the photoinitiator is 0.1 to 10 parts by mass based on 100 parts by mass of the component (A).

The photo-curable resin composition of the present invention may further contain an adhesion-imparting agent. As the adhesion-imparting agent, those described in the first invention can be used. The amount of the adhesion-imparting agent is 0.01 to 20 parts by mass, preferably 0.5 to 5 parts by mass based on 100 parts by mass of the component (A).

The photo-curable resin composition of the present invention may further contain an antioxidant. As the antioxidant, those described in the first invention can be used. The amount of the antioxidant is 0.01 to 10 parts by mass, preferably 0.5 to 5 parts by mass based on 100 parts by mass of the component (A).

The photo-curable resin composition of the present invention can be a resin composition of a combination type of photo-curing and thermosetting as in the first invention. The amount of the organic peroxide is 0.1 to 10 parts by mass, preferably 1 to 5 parts by mass based on 100 parts by mass of the component (A).

As curing accelerators for these organic peroxides, naphthenic acid metal complexes, dimethylaniline, quaternary ammonium salts and phosphoric acid esters can be used.

The present invention relates to a display panel comprising a display body and an optically functional material bonded with the above-described photo-curable resin composition, and to be used for electronic devices such as televisions, digital cameras, cellular phones, personal computers, monitors, televisions .

<Examples>

The present invention is explained by the following examples, but the present invention is not limited to these examples.

(Example 1)

The components shown in Tables 1 and 2 were compounded in the amounts shown in Tables 1 and 2 (parts by mass) to obtain the photo-curable resin compositions of Examples A to I, respectively.

UC-1: polyisoprene methacrylate oligomer (molecular weight: 25000)

QM657: dicyclopentenyloxyethyl methacrylate

LA: Lauryl acrylate

CH: Cyclohexyl methacrylate

PO: Phenoxyethyl methacrylate

AMP-20GY: Phenoxypolyethylene glycol acrylate

702A: 2-hydroxy-3-phenoxypropyl acrylate

THF: tetrahydrofurfuryl methacrylate

NP-4EA: nonylphenol EO adduct acrylate

MTG-A: Methoxy triethylene glycol acrylate

Lucylline TPO: 2,4,6-trimethylbenzoyl phenyl ethoxyphosphine oxide

Irgacure 184: 1-Hydroxy-cyclohexyl-phenyl-ketone

Polio 110: liquid polybutadiene

L-LIR: liquid polyisoprene

Irganox 1010: pentaerythrityl tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate]

(Test Example 1)

Using the photo-curable resin compositions of Examples A to I prepared in Example 1, characteristic values were analyzed by the following various tests. The results are shown in Tables 3 to 5 below. No bubbles were present in Examples A to I in the heat shock test, the heat resistance test and the humidity resistance test.

The elastic modulus and elongation at break were measured at a speed of 10 m / min using an autograph of JISZ 1702 No. 3 dumbbell specimen (thickness 1 mmt) manufactured by Shimadzu Corporation. In addition, the dumbbell specimen was cured to a cumulative light quantity of 6000 mJ / cm 2 using a diffusion metal halide lamp equipped with a conveyor.

The shrinkage percentage was calculated from the volume ratio of the liquid ratio and the cured product by measuring the liquid ratio and the specific gravity of the cured product according to JIS-K-6833.

The transmittance was measured by using an ultraviolet visible spectrophotometer manufactured by Nippon Bunko Co., Ltd., to obtain a specimen prepared by curing the resin composition with a glass (1 mm thickness) on the reference side, a 1 mm thickness between the glass and 1 mm thickness on the sample chamber side, Wavelength. The transmittance after 500 hours at 85 占 폚 and after 500 hours at 60 占 폚 / 90% was measured in the same manner.

The refractive index was measured with a Abbe refractometer (D line, 25 캜) manufactured by Atago, and a test piece prepared in a sheet form having a thickness of 300 탆 was measured.

The heat shock test was performed on a specimen (glass / glass plate) having a cured thickness of 100 占 퐉 using an acrylic plate (MR-200 manufactured by Mitsubishi Rayon Co., Ltd.) and a glass plate (30 占 40 mm) (Glass / glass test piece) prepared by bonding a glass plate of 0.8 mm thickness and a glass plate of 0.7 mm thickness (30 x 40 mm) to a curing thickness of 100 mu m using a photocurable resin composition . The specimens were subjected to 500 cycles of -40 ° C ↔ 85 ° C for 30 minutes each, and visually observed for peeling, bubbles and breakage after the test.

In the heat resistance test, the same test piece as that used in the heat shock test was maintained in an 85 ° C oven for 500 hours, and visually observed for peeling, bubbles and breakage after the test.

In the humidity resistance test, the same test piece as used in the heat shock test was maintained at a constant temperature and humidity of 60 ° C / 90% for 500 hours. After the test, the test piece was visually checked for the presence of bubbles and breakage.

In addition, it is possible to measure the adhesive property for the touch panel adhesion in the test with the glass / glass test piece, and to measure the adhesive property between the display material and the optical functional material in the test with the glass / acrylic test piece.

(Example 2)

The components shown in Table 6 below were blended in the amounts shown in Table 6 to obtain the photo-curable resin compositions of Examples A2 to H2.

UC-1: polyisoprene methacrylate oligomer (molecular weight: 25000)

HOB: 2-hydroxybutyl methacrylate

QM657: dicyclopentenyloxyethyl methacrylate

BZ: benzyl methacrylate

Car lens PE-1: Pentaerythritol tetrakis (3-mercaptobutyrate)

TMMP: trimethylolpropane tris (3-mercaptopropionate)

Lucylline TPO: 2,4,6-trimethylbenzoyl phenyl ethoxyphosphine oxide

Irgacure 184: 1-Hydroxy-cyclohexyl-phenyl-ketone

Polio 110: liquid polybutadiene

L-LIR: liquid polyisoprene

Irganox 1010: pentaerythrityl tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate]

Irganox 1520L: 4,6-bis (octylthiomethyl) -o-cresol

(Test Example 2)

Using the photo-curable resin compositions of Examples A2 to H2 prepared in Example 2, various tests were carried out to analyze characteristic values.

The results of the analysis are shown in Table 7 below. No bubbles were present in any of Examples A2 to H2 in the heat shock test, the heat resistance test and the humidity resistance test.

According to the first aspect of the present invention, in the case of joining a bright plate or an icon sheet on a touch panel, or bonding a transparent plate and a transparent plate on which a transparent electrode is formed in a capacitive touch panel to a transparent plate, The present invention can provide a photo-curable adhesive composition for bonding without including a curing agent.

According to the second or third aspect of the present invention, there is provided a light-curable resin composition for bonding an optical functional material to a display body in which the adhesive surface is peeled off or the glass of the display body is not broken, Can be provided.

Claims (7)

(Meth) acrylate oligomer having (A) a polyisoprene skeleton, (B) a softening component and (C1) phenoxypolyethylene glycol (meth) acrylate, 2-hydroxy- , A nonylphenol EO adduct (meth) acrylate, and a methoxytriethylene glycol (meth) acrylate, wherein the (meth) acrylate monomer is at least one selected from the group consisting of Wherein the cured product has an elastic modulus of 1 kPa or more and less than 12 kPa, and an elongation at break of the cured product is 300% or more and 700% or less. The optical recording medium according to claim 1, wherein the cured product has an initial transmittance of at least 95% at 400 to 800 nm light, has a transmittance of 70% or more after being left at 60 DEG C and a humidity of 90% for 500 hours, And a light transmittance of 90% or more. 3. The photocurable resin composition according to claim 1 or 2, wherein the cured product has a refractive index of 1.45 to 1.55. The positive resist composition as claimed in claim 1 or 2, which comprises 100 parts by mass of the (meth) acrylate oligomer (A), 10 to 400 parts by mass of the softening component (B) and 1 to 100 parts by mass of the (meth) To 100 parts by mass. The photocurable resin composition according to claim 4, wherein the amount of the (meth) acrylate monomer (C1) is 5 to 50 parts by mass. A display panel comprising a display body and an optically functional material bonded to each other with the photo-curable resin composition according to claim 1 or 2. delete