JP2015155533A - Curable resin composition, cured product, optical member, and optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a curable resin composition that gives a cured product having high transparency, low water absorption and excellent reflow resistance, and a cured product, an optical member, and an optical device relating to the curable resin composition.

SOLUTION: The curable resin composition comprises a (meth)acrylic polymer (A) having a polymerizable double bond in a side chain, a monofunctional (meth)acrylic polymerizable monomer (B) having an aromatic ring structure, and a radical polymerization initiator (C). The curable resin composition may further contain a polyfunctional (meth)acrylic polymerizable monomer (D).

COPYRIGHT: (C)2015,JPO&INPIT

Description

  The present invention relates to a curable resin composition, a cured product, an optical member, and an optical device.

  In recent years, there has been an increasing demand for surface mounting of optical devices, and there has been a demand for reflow resistance of transparent resin materials such as lenses used in camera modules, diffusion lenses and condenser lenses used in light-emitting diodes. Yes. Along with this, the conversion from thermoplastic resins conventionally used for these members to thermosetting resins having excellent heat resistance is proceeding.

  A (meth) acrylic resin typified by polymethylmethacrylate is particularly excellent in transparency, and is therefore used in optical members such as flat panel display members and optical waveguides. However, since the (meth) acrylic resin has a high water absorption rate, the refractive index and dimensional change are likely to occur, making it difficult to use as a lens material. Further, since the (meth) acrylic resin is a thermoplastic resin, for example, the processing conditions (85 ° C., 85% RH, 168 hours) of the moisture absorption guarantee standard LEVEL 1 of the United States Joint Electronic Equipment Technical Committee (JEDEC) are performed. Then, if solder reflow is performed, it melts, and deformation and foaming also occur due to evaporation of moisture. Hereinafter, the property that does not melt or foam even when the solder reflow treatment is performed is referred to as reflow resistance.

As a technique for reducing the water absorption rate in a (meth) acrylic resin, for example, Patent Document 1 discloses a low-hygroscopic methacrylic resin obtained by copolymerizing methyl methacrylate with cyclohexyl methacrylate. The document also describes that the methacrylic resin can be suitably used as a molding material such as a plastic lens for optical equipment.
Patent Document 2 discloses a methacrylic resin obtained by copolymerizing phenyl methacrylate and methyl methacrylate. The document also describes that the methacrylic resin has low hygroscopicity and is suitable for an optical recording substrate.

  On the other hand, Patent Document 3 discloses an acrylic syrup comprising a (meth) acrylic polymer having two or more radical polymerizable double bonds in the molecule and a radical polymerizable monomer, a hydroperoxide curing agent, and A (meth) acrylic resin composition containing a thiourea curing accelerator is disclosed. The document also describes that a cured product obtained by curing the (meth) acrylic resin composition is uncolored and excellent in transparency and has good mechanical properties.

JP 58-5318 A JP 61-293211 A JP 2004-292527 A

However, since the methacrylic resins of Patent Documents 1 and 2 are thermoplastic resins that do not form a crosslinked structure, foaming occurs when solder reflow treatment is performed after moisture absorption.
Moreover, in the Example of patent document 3, the methyl (meth) acrylate monomer with a high water absorption rate is used, and it will foam if a solder reflow process is performed with respect to the hardened | cured material using such a monomer. Moreover, the (meth) acrylic-type resin composition of the literature is for topcoat layer formation of large sized articles, such as a decorative board.
Therefore, the present invention provides a curable resin composition that provides a cured product having high transparency, low water absorption, and excellent reflow resistance, and a cured product, an optical member, and an optical device according to the curable resin composition. The purpose is to provide.

As a result of intensive studies, the present inventors have found a curable resin composition capable of obtaining a cured product having high transparency, low water absorption, and excellent reflow resistance, and has completed the present invention.
That is, the present invention has the following configuration.
[1] A (meth) acrylic polymer (A) having a polymerizable double bond in the side chain, a monofunctional (meth) acrylic polymerizable monomer (B) having an aromatic ring structure, and a radical polymerization initiator A curable resin composition containing (C).
[2] Total amount of (meth) acrylic polymer (A) having a polymerizable double bond in the side chain and monofunctional (meth) acrylic polymerizable monomer (B) having an aromatic ring structure In contrast, 5 to 80% by mass of the (meth) acrylic polymer (A) having a polymerizable double bond in the side chain, and a monofunctional (meth) acrylic polymerizable monomer having the aromatic ring structure Curable resin composition as described in [1] containing 20-95 mass% of (B).
[3] The curable resin composition according to [1] or [2], further comprising a polyfunctional (meth) acrylic polymerizable monomer (D).
[4] The (meth) acrylic polymer (A) having a polymerizable double bond in the side chain, the monofunctional (meth) acrylic polymerizable monomer (B) having the aromatic ring structure, and the poly 5 to 50% by mass of the (meth) acrylic polymer (A) having a polymerizable double bond in the side chain, based on the total amount of the functional (meth) acrylic polymerizable monomer (D), 20 to 94% by mass of the monofunctional (meth) acrylic polymerizable monomer (B) having an aromatic ring structure, and 1 to 50% by mass of the polyfunctional (meth) acrylic polymerizable monomer (D). % Curable resin composition according to [3].
[5] The curable resin composition according to any one of [1] to [4], further containing a phosphor.
[6] A cured product obtained by curing the curable resin composition according to any one of [1] to [5].
[7] An optical member comprising the cured product according to [6].
[8] An optical device comprising the optical member according to [7].

  According to the present invention, a curable resin composition capable of obtaining a cured product having high transparency, low water absorption, and excellent reflow resistance, and a cured product, an optical member, and an optical device according to the curable resin composition. Can be provided.

Sectional drawing which shows one Embodiment of the camera module provided with the camera lens which consists of hardened | cured material of this invention. Sectional drawing which shows one Embodiment of the light emitting diode device provided with the lens for light emitting diodes which consists of hardened | cured material of this invention. Sectional drawing which shows one Embodiment of the light emitting diode device provided with the fluorescent substance sheet which consists of hardened | cured material of this invention. The temperature profile of the reflow test in an Example.

In this specification, “(meth) acryl” is a generic term for “acryl” and “methacryl”, and “(meth) acrylate” is a generic term for “acrylate” and “methacrylate”. “(Meth) acryloyl group” is a general term for “acryloyl group” and “methacryloyl group”, and is a group represented by CH ₂ ═C (R) —C (═O) — (R is a hydrogen atom or a methyl group). It is.
The “monomer unit” means a repeating unit constituting a polymer.

<Curable resin composition>
The curable resin composition of this invention contains (A) component, (B) component, and (C) component.
The curable resin composition may further contain (D) component or other components.

  The viscosity of the curable resin composition is preferably 100 to 50,000 mPa · s as measured with a B-type viscometer at 23 ° C. By setting the viscosity of the curable resin composition to the lower limit value or more, resin leakage from a dispenser or a mold can be suppressed. On the other hand, by setting it to the upper limit value or less, the fluidity of the curable resin composition becomes appropriate, and the workability when using the curable resin composition is improved.

[(A) component]
The component (A) is a (meth) acrylic polymer having a polymerizable double bond in the side chain. That is, the component (A) has a polymerizable double bond as a side chain on a (meth) acrylic polymer having a (meth) acrylic monomer unit as a main chain (hereinafter referred to as “base polymer”). The functional group has a substituted chemical structure.
In the curable resin composition, the component (A) is preferably dissolved in the component (B) and the component (D).

(Base polymer)
The base polymer may be a polymer composed of a single (meth) acrylic monomer unit, or may be a copolymer composed of a plurality of (meth) acrylic monomer units.
The (meth) acrylic monomer unit may be a monofunctional monomer unit or a polyfunctional monomer unit.

  Specific examples of the (meth) acrylic monofunctional monomer unit include (meth) acrylic acid, succinic acid 2- (meth) acryloyloxyethyl, maleic acid 2- (meth) acryloyloxyethyl, and phthalic acid 2- (meth). (Meth) acrylic monomer units containing carboxyl groups such as acryloyloxyethyl and 2- (meth) acryloyloxyethyl hexahydrophthalate, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n -Butyl (meth) acrylate, i-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, heptyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate , Isooctyl (meta Alkyl (meth) acrylate units such as acrylate, n-nonyl (meth) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate, lauryl (meth) acrylate, tridecyl (meth) acrylate and stearyl (meth) acrylate, cyclohexyl Fats such as (meth) acrylate, dicyclopentenyl (meth) acrylate, 2-dicyclopentenoxyethyl (meth) acrylate, isobornyl (meth) acrylate, dicyclopentanyl (meth) acrylate, and adamantyl (meth) acrylate (Meth) acrylic monomer units containing a cyclic structure, phenyl (meth) acrylate, benzyl (meth) acrylate, phenoxyethyl (meth) acrylate, phenoxypolyethylene glycol ( (Ta) acrylate, nonylphenoxypolyethylene glycol (meth) acrylate, phenoxypolypropylene glycol (meth) acrylate, biphenyl (meth) acrylate, and (meth) acryl containing aromatic ring structures such as ethoxylated ortho-phenylphenol (meth) acrylate Monomer units, alkoxy (meth) acrylate units such as methoxyethyl (meth) acrylate, ethoxyethyl (meth) acrylate and butoxyethyl (meth) acrylate, heterocycles such as tetrahydrofurfuryl (meth) acrylate and glycidyl (meth) acrylate (Meth) acrylic monomer unit containing structure, as other, 3- (meth) acryloxypropyltrimethoxysilane unit, 3- (meth) acryloxypropy Examples include a rutriethoxysilane unit, a 2- (meth) acryloyloxyethyl acid phosphate unit, a trifluoroethyl (meth) acrylate unit, a heptadecafluorodecyl (meth) acrylate unit, and a (meth) acryloylmorpholine unit.

  Specific examples of the (meth) acrylic polyfunctional monomer unit include ethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, butylene glycol di (Meth) acrylate, polybutylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, tricyclodecane dimethanol di (meth) acrylate, polycarbonate diol di ( (Meth) acrylate, polyester diol di (meth) acrylate, bisphenol A ethylene oxide adduct di (meth) acrylate, bisphenol A propylene oxide adduct Bifunctional (meth) acrylate units such as (meth) acrylate, polyurethane di (meth) acrylate, and 9,9-bis [4- (2- (meth) acryloyloxyethoxy) phenyl] fluorene, trimethylolpropane tri ( Trifunctional (meth) acrylate units such as (meth) acrylate, ethoxylated isocyanuric acid tri (meth) acrylate, ε-caprolactone-modified tris ((meth) acryloxyethyl) isocyanurate, ditrimethylolpropane tetra (meth) acrylate, etc. Examples include tetrafunctional (meth) acrylate units, pentafunctional (meth) acrylate units such as dipentaerythritol penta (meth) acrylate, and hexafunctional (meth) acrylate units such as dipentaerythritol hexa (meth) acrylate. .

  Among these, from the viewpoint of solubility in the component (B) and the component (D), a monofunctional monomer unit is preferable, and a methyl (meth) acrylate unit, a phenyl (meth) acrylate unit, a benzyl (meth) acrylate unit, and phenoxyethyl. (Meth) acrylate units are more preferred, methyl (meth) acrylate units and phenyl (meth) acrylate units are more preferred from the viewpoint of high glass transition point, and phenyl (meth) acrylate units are particularly preferred from the viewpoint of low water absorption. .

  The copolymer in the case where the base polymer is a copolymer is not particularly limited, but contains an alkyl (meth) acrylate and a carboxyl group from the viewpoint of excellent copolymerizability and good reflow resistance of a cured product ( A copolymer of a (meth) acrylic monomer, a copolymer of a (meth) acrylic monomer containing an aromatic ring structure and a (meth) acrylic monomer containing a carboxyl group is preferred, and methyl (meth) acrylate and (meth) acrylic acid Of these, a copolymer of phenyl (meth) acrylate and (meth) acrylic acid or 2- (meth) acryloyloxyethyl phthalate is more preferable. From the viewpoint of the transparency of the cured product, a copolymer of methyl (meth) acrylate and (meth) acrylic acid, and a copolymer of phenyl (meth) acrylate and 2- (meth) acryloyloxyethyl phthalate are available. Further preferred.

  The base polymer may contain a vinyl group-containing monomer unit in addition to the (meth) acrylic monomer unit. Specific examples of the vinyl group-containing monomer unit include aromatic vinyl monomer units such as styrene and α-methylstyrene, vinyl cyanide monomer units such as acrylonitrile, and vinyl ester monomer units such as vinyl acetate.

  From the viewpoint of transparency, the (meth) acrylic monomer unit in the base polymer is preferably 50% by mass or more, and more preferably 80% by mass or more.

  The mass average molecular weight (hereinafter referred to as “Mw”) of the base polymer is preferably 1,000 to 500,000, more preferably 5,000 to 400,000, and still more preferably 10,000 to 300,000. By setting Mw to 1,000 or more, the strength of the cured product can be increased. Moreover, the solubility of (A) component in curable resin composition can be made favorable because Mw shall be 500,000 or less.

(Functional group having a polymerizable double bond)
A polymerizable double bond means a double bond capable of radical polymerization.
Examples of the functional group having a polymerizable double bond contained in the side chain include a (meth) acryloyl group and a vinyl group. A (meth) acryloyl group is preferred from the viewpoint of polymerizability with the component (B) or the component (D).

  The component (A) preferably has a plurality of double bonds in one molecule. The double bond equivalent of the component (A) (g mass of polymer per 1 mol of double bond) is preferably 500 to 20,000 g / mol, and preferably 1,000 to 15,000 g / mol. Is more preferable. (A) The intensity | strength of hardened | cured material becomes favorable because the double bond equivalent of a component shall be more than the said lower limit. On the other hand, the reflow resistance of hardened | cured material becomes favorable by setting it as the said upper limit or less.

(Amount of component (A))
5-80 mass% is preferable with respect to the total amount of (A) component and (B) component, as for the compounding quantity of (A) component in curable resin composition, More preferably, it is 10-70 mass%, More preferably, Is 15 to 60% by mass, particularly preferably 20 to 50% by mass.
Moreover, the compounding quantity of (A) component in curable resin composition has preferable 5-50 mass% with respect to the total amount of (A) component, (B) component, and (D) component, More preferably, 10 It is -45 mass%, More preferably, it is 15-40 mass%, Most preferably, it is 20-40 mass%.
By setting the blending amount of the component (A) in the curable resin composition to be equal to or higher than the lower limit, the viscosity of the curable resin composition can be increased, the water absorption of the cured product is decreased, and Reflowability is also improved. On the other hand, by setting it to the upper limit value or less, the viscosity of the curable resin composition can be lowered, and the transparency of the cured product is improved.

(Production method of component (A))
The component (A) may be obtained by polymerizing monomers to synthesize a base polymer and then introducing a functional group having a polymerizable double bond into the base polymer by a chemical modification method. You may obtain by polymerizing the monomer which introduce | transduced the functional group which has a polymerizable double bond.
The polymerization method is not particularly limited, and for example, the polymerization can be performed by a known method such as a solution polymerization method, a suspension polymerization method, an emulsion polymerization method, or a partial polymerization method. In the present invention, the suspension polymerization method is preferred because it is relatively easy to control the polymerization reaction and to separate the produced polymer.

Examples of the chemical modification method for introducing a functional group having a polymerizable double bond into the monomer or base polymer include a reaction between a carboxyl group and a glycidyl group, and a reaction between a hydroxyl group and an isocyanate group.
For example, in the case of a reaction between a carboxyl group and a glycidyl group, a (meth) acrylic monomer having a carboxyl group or a base polymer containing the monomer unit is reacted with a compound having a glycidyl group and a double bond.
Examples of the compound having a double bond with the glycidyl group include glycidyl (meth) acrylate and 4-hydroxybutyl (meth) acrylate glycidyl ether. From the viewpoint of the transparency of the cured product, glycidyl (meth) acrylate is preferred.
Examples of the (meth) acrylic monomer having a carboxyl group include (meth) acrylic acid, 2- (meth) acryloyloxyethyl succinate, 2- (meth) acryloyloxyethyl maleate, 2- (meth) phthalate. ) Acryloyloxyethyl, 2- (meth) acryloyloxyethyl hexahydrophthalate, and the like.

In the chemical modification method, it is preferable to use a reaction catalyst in order to shorten the reaction time. Examples of the reaction catalyst include quaternary ammonium salts such as tetrabutylammonium bromide, quaternary phosphonium salts such as ethyltriphenylphosphonium bromide, and phosphine compounds such as triphenylphosphine. In view of the transparency of the cured product, a quaternary ammonium salt is particularly preferable.
As a quantity of a reaction catalyst, 0.05-5 mass parts is preferable with respect to 100 mass parts of monomers or base polymers, and 0.1-3 mass parts is more preferable. By setting the amount of the reaction catalyst within the above range, the reaction time can be shortened and the transparency of the cured product is improved.

  In chemical modification, it is preferable to use a polymerization inhibitor in order to suppress polymerization and stabilize the introduction of functional groups. Examples of the polymerization inhibitor include dibutylhydroxytoluene, hydroquinone, methylhydroquinone, hydroquinone monomethyl ether, mono t-butylhydroquinone, 2,5-dit-butylhydroquinone, p-benzoquinone, catechol, phenothiazine, t-butylcatechol and the like. It is done.

  The reaction temperature in the chemical modification method is preferably 50 ° C to 150 ° C. The reaction time is preferably 0.5 to 30 hours. By setting the reaction temperature or the reaction time within the above range, the double bond introduction rate is improved, and the gelation of the reaction product is suppressed.

[Component (B)]
The component (B) is a monofunctional (meth) acrylic polymerizable monomer having an aromatic ring structure.
(B) As an aromatic ring structure which a component has, a benzene ring, a naphthalene ring, and an anthracene ring are mentioned, for example. Especially, a benzene ring is preferable from a compatible viewpoint with (A) component and (D) component.
Specific examples of the component (B) having a benzene ring structure include phenyl (meth) acrylate, benzyl (meth) acrylate, phenoxyethyl (meth) acrylate, phenoxypolyethylene glycol (meth) acrylate, and nonylphenoxypolyethylene glycol (meth) acrylate. , Phenoxypolypropylene glycol (meth) acrylate, 2- (meth) acryloyloxyethyl-2-hydroxypropyl phthalate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, 2- (meth) acryloyloxyethyl hydrogen phthalate, 2- (Meth) acryloyloxypropyl hydrogen phthalate, ethoxylated ortho-phenylphenol (meth) acrylate, and the like. Of these, phenyl (meth) acrylate, benzyl (meth) acrylate, and phenoxyethyl (meth) acrylate are preferred from the viewpoint of transparency of the cured product, and phenyl (meth) acrylate is preferred because of its low water absorption point and high glass transition point. More preferred is benzyl (meth) acrylate.

20-95 mass% is preferable with respect to the total amount of (A) component and (B) component, and, as for the compounding quantity of (B) component in curable resin composition, More preferably, it is 30-90 mass%, More preferably, Is 40 to 85% by mass, particularly preferably 50 to 80% by mass.
Moreover, 20-94 mass% is preferable with respect to the total amount of (A) component, (B) component, and (D) component, and, as for the compounding quantity of (B) component in curable resin composition, More preferably, it is 30. It is -88 mass%, More preferably, it is 40-82 mass%, Most preferably, it is 40-76 mass%.
By making the compounding quantity of (B) component in curable resin composition more than the said lower limit, the viscosity of curable resin composition can be made low and transparency of cured | curing material becomes favorable. On the other hand, by setting it to the upper limit value or less, the viscosity of the curable resin composition can be increased, and the contents of the component (A) and the component (C) can be increased, and the reflow resistance is improved. Become good.

[Component (C)]
Component (C) is a radical polymerization initiator. Examples of the radical polymerization initiator include a thermal polymerization initiator, a photopolymerization initiator, and a peroxide used for redox polymerization.
(C) The kind of component is suitably selected according to the polymerization method at the time of hardening a curable resin composition and producing hardened | cured material.

For example, the thermal polymerization initiator is a radical polymerization initiator used for thermal polymerization, and examples thereof include organic peroxides and azo compounds.
Specific examples of the organic peroxide include ketone peroxides such as methyl ethyl ketone peroxide; 1,1-di (t-hexylperoxy) -3,3,5-trimethylcyclohexane, 1,1-di (t-hexyl) Peroxy) cyclohexane, 1,1-di (t-butylperoxy) cyclohexane and the like; 1,1,3,3-tetramethylbutyl hydroperoxide, cumene hydroperoxide, p-menthane hydroperoxide Hydroperoxides such as dialkyl peroxides such as dicumyl peroxide and di-t-butyl peroxide; diacyl peroxides such as dilauroyl peroxide and dibenzoyl peroxide; di (4-t-butylcyclohexyl) peroxy Dicarbonate, di ( Peroxydicarbonates such as -ethylhexyl) peroxydicarbonate; and t-butylperoxy-2-ethylhexanoate, t-hexylperoxyisopropylmonocarbonate, t-butylperoxybenzoate, 1,1,3, Peroxyesters such as 3-tetramethylbutyl-2-ethylhexanoate are listed. These can be used alone or in combination of two or more.
Specific examples of the azo compound include 2,2′-azobisisobutyronitrile, 2,2′-azobis (2-methylbutyronitrile), 2,2′-azobis (2,4-dimethylvaleronitrile). 1,1′-azobis-1-cyclohexanecarbonitrile, dimethyl-2,2′-azobisisobutyrate, 4,4′-azobis-4-cyanovaleric acid, and 2,2′-azobis- (2-Amidinopropane) dihydrochloride. These can be used alone or in combination of two or more.

The photopolymerization initiator is a radical polymerization initiator used for photopolymerization.
Examples of the photopolymerization initiator include benzophenone type compounds such as benzophenone, 4-methylbenzophenone, 2,4,6-trimethylbenzophenone, methylorthobenzoylbenzoate, and 4-phenylbenzophenone; t-butylanthraquinone and 2-ethylanthraquinone Anthraquinone type compounds such as 2-hydroxy-2-methyl-1-phenylpropan-1-one, oligo {2-hydroxy-2-methyl-1- [4- (1-methylvinyl) phenyl] propanone}, benzyl Dimethyl ketal, 1-hydroxycyclohexyl phenyl ketone, benzoin methyl ether, 2-methyl- [4- (methylthio) phenyl] -2-morpholino-1-propanone and 2-hydroxy-1- [4- [4- (2- Hydroxy-2-methyl Alkylphenone type compounds such as lopionyl) benzyl] phenyl] -2-methylpropan-1-one; 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1, diethylthioxanthone and isopropylthioxanthone 2,4,6-trimethylbenzoyldiphenylphosphine oxide, bis (2,6-dimethoxybenzoyl) -2,4,4-trimethylpentylphosphine oxide and bis (2,4,6-trimethylbenzoyl)- Examples include acylphosphine oxide type compounds such as phenylphosphine oxide; phenylglyoxylate type compounds such as phenylglyoxylic acid methyl ester. These can be used alone or in combination of two or more.

The redox polymerization initiator is a peroxide used for redox polymerization. The peroxide is used in combination with a reducing agent.
Specific examples of the redox polymerization initiator include dibenzoyl peroxide (component (C)), N, N-dimethylaniline, N, N-dimethyl-p-toluidine, N, N-bis (2-hydroxypropyl). ) -P-toluidine and other aromatic tertiary amines (reducing agent) combined system; hydroperoxide (component (C)) and metal soaps (reducing agent) combined system; hydroperoxide ((C ) Component) and thioureas (reducing agent).

  When an organic peroxide is used as the component (C), the 10-hour half-life temperature of the component (C) is preferably 35 ° C. to 80 ° C. from the viewpoint of the curing time and pot life of the curable resin composition. More preferably, it is 40-75 degreeC, More preferably, it is 45 degreeC-70 degreeC. By setting the 10-hour half-life temperature to be equal to or higher than the lower limit, the curable resin composition is hardly gelled at room temperature, and the pot life is improved. On the other hand, the hardening time of curable resin composition is shortened by setting it as the said upper limit or less.

  As the organic peroxide, hydroperoxide, peroxydicarbonate and peroxyester are preferable, and specific examples thereof include 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate (Japan Product name: Perocta (registered trademark) O, 10 hour half-life temperature = 65.3 ° C., t-butyl peroxy-2-ethylhexanoate (manufactured by NOF Corporation, product name: perbutyl (registered) Trademark) O, 10 hour half-life temperature = 72.1 ° C.), di (4-t-butylcyclohexyl) peroxydicarbonate (manufactured by NOF Corporation, trade name: Perroyl (registered trademark) TCP, 10 hour half-life temperature) = 40.8 ° C.) and the like.

  As the photopolymerization initiator, an alkylphenone type compound is preferable from the viewpoint that coloring of the cured product can be suppressed, and among them, 1-hydroxycyclohexyl phenyl ketone is particularly preferable. In addition, it is preferable to use an acyl phosphine oxide type compound in combination because the cured product can be sufficiently cured easily, and among them, 2,4,6-trimethyl is particularly preferable in that coloring of the cured product can be suppressed. Benzoyldiphenylphosphine oxide is preferred.

  The compounding amount of the component (C) in the curable resin composition is the (A) component, (B) component, and (D) in terms of the curing time of the curable resin composition and the transparency and strength of the cured product. 0.05-5.0 mass% is preferable with respect to the total amount of a component, 0.1-4.0 mass% is more preferable, 0.3-3.0 mass% is further more preferable.

[(D) component]
The component (D) is a polyfunctional (meth) acrylic polymerizable monomer. By containing the component (D) in the curable resin composition, the reflow resistance of the cured product obtained from the curable resin composition can be further improved.

  Examples of the component (D) include ethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, butylene glycol di (meth) acrylate, poly Compounds having an alkylene glycol skeleton such as butylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, tricyclodecane dimethanol di (meth) acrylate, polycarbonate diol di (Meth) acrylate, bisphenol A ethylene oxide adduct di (meth) acrylate, bisphenol A propylene oxide adduct di (meth) acrylate, 9,9 Compounds having a cyclic structure such as bis [4- (2- (meth) acryloyloxyethoxy) phenyl] fluorene, ethoxylated isocyanuric acid tri (meth) acrylate, ε-caprolactone-modified tris ((meth) acryloxyethyl) isocyanurate Polyester diol di (meth) acrylate, polyurethane di (meth) acrylate, trimethylolpropane tri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) An acrylate etc. are mentioned.

Among them, those having a cyclic structure are preferable from the viewpoint of the transparency and low water absorption of the cured product, and those having a tricyclodecane, fluorene, benzene ring, and a triazine structure from the viewpoint of further improving the transparency of the cured product. More preferred.
Moreover, since (D) component can improve the crosslinking density of hardened | cured material, so that there are many (meth) acryloyl groups, reflow resistance becomes still more favorable. (D) As for the number of (meth) acryloyl groups of a component, 2-6 are preferable from a viewpoint of the intensity | strength of hardened | cured material, 2-4 are more preferable, and 2-3 are more preferable.

  1-50 mass% is preferable with respect to the total amount of (A) component, (B) component, and (D) component, and, as for the compounding quantity of (D) component in curable resin composition, More preferably, it is 2-40. It is 3 mass%, More preferably, it is 3-30 mass%, Most preferably, it is 4-20 mass%. (D) By making the compounding quantity of a component below the said upper limit, transparency of hardened | cured material can be maintained favorable.

[Other ingredients]
You may make the curable resin composition contain other components other than the above-mentioned (A) component-(D) component in the range which does not impair the effect of this invention.
Other components include, for example, antioxidants, phosphors, vinyl group-containing monomers other than (B) component and (D) component, rubber, plasticizers, ultraviolet absorbers, antifoaming agents, thixotropic agents, Examples thereof include polymerization inhibitors, mold release agents, glass flakes, glass fibers, pigments, silica fine particles, and silsesquioxane compounds.

(Antioxidant)
Antioxidants are used to improve the heat-resistant yellowing of the cured product.
Examples of the antioxidant include 2,6-di-t-butylphenol, 2,6-di-t-butyl-p-cresol, and n-octadecyl-3- (3 ′, 5′-di-t-butyl. -4′-hydroxyphenyl) propionate, tetrakis- [methylene-3- (3 ′, 5′-di-t-butyl-4′-hydroxyphenyl) propionate] methane, triethylene glycol bis [3- (3-t -Butyl-5-methyl-4-hydroxyphenyl) propionate], 1,6-hexanediol bis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] And triphenyl phosphite, trisisodecyl phosphite, tristridecyl phosphite, tris (2,4-di-t-butylphenyl) phosphat Phosphorus antioxidants such as dilauryl-3,3′-thiodipropionate, ditridecyl-3,3′-thiodipropionate, dimyristyl-3,3′-thiodipropionate, distereal-3,3 And sulfur-based antioxidants such as' -thiodipropionate and pentaerythritol tetrakis (β-laurylthiopropionate).
These can be used alone or in combination of two or more.

  In the present invention, it is preferable to use a phenol-based antioxidant and a phosphorus-based antioxidant in combination as the antioxidant. Preferred combinations of phenolic antioxidants and phosphorus antioxidants include tetrakis- [methylene-3- (3 ′, 5′-di-t-butyl-4′-hydroxyphenyl) propionate as a phenolic antioxidant. ] At least one selected from methane, n-octadecyl-3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate, and tris (2,4-di-acid) as a phosphorus-based antioxidant. -T-butylphenyl) phosphite combinations.

  The blending amount of the antioxidant in the curable resin composition is that the heat-resistant yellowing of the cured product is good, and the total amount of the (A) component, the (B) component, and the (D) component is 100 parts by mass. 0.01-5 parts by mass is preferable, 0.03-3 parts by mass is more preferable, and 0.05-2 parts by mass is more preferable.

(Phosphor)
When the curable resin composition is used, for example, as a preparation of a fluorescent sheet for wavelength conversion used in a light emitting diode or a solar cell or as a fluorescent paint, a wavelength conversion material such as a phosphor can be blended.
Examples of the phosphor include a YAG phosphor, a sulfide phosphor, a thiogallate phosphor, a silicate phosphor, an aluminate phosphor, a nitride phosphor, and an oxynitride phosphor.

(Vinyl group-containing monomer)
Specific examples of the vinyl group-containing monomer other than the component (B) and the component (D) having a (meth) acryloyl group include (meth) acrylic acid, succinic acid 2- (meth) acryloyloxyethyl, and maleic acid. 2- (meth) acryloyloxyethyl, 2- (meth) acryloyloxyethyl phthalate and 2- (meth) acryloyloxyethyl hexahydrophthalate containing a carboxyl group (meth) acrylic monomer, methyl (meth) Acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, i-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, heptyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-oct (Meth) acrylate, isooctyl (meth) acrylate, n-nonyl (meth) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate, lauryl (meth) acrylate, tridecyl (meth) acrylate, and stearyl (meth) acrylate Such as alkyl (meth) acrylate, cyclohexyl (meth) acrylate, dicyclopentenyl (meth) acrylate, 2-dicyclopentenoxyethyl (meth) acrylate, isobornyl (meth) acrylate, dicyclopentanyl (meth) acrylate and the like , (Meth) acrylic monomers containing alicyclic structures such as adamantyl (meth) acrylate, methoxyethyl (meth) acrylate, ethoxyethyl (meth) acrylate, and butoxyethyl (meth) (Meth) acrylic monomers containing a heterocyclic structure such as alkoxy (meth) acrylates such as acrylate, tetrahydrofurfuryl (meth) acrylate, glycidyl (meth) acrylate, and others, 3- (meth) acryloxypropyltri Methoxysilane, 3- (meth) acryloxypropyltriethoxysilane, 2- (meth) acryloyloxyethyl acid phosphate, trifluoroethyl (meth) acrylate, heptadecafluorodecyl (meth) acrylate, and (meth) acryloyl morpho Phosphorus etc. are mentioned. Specific examples of the vinyl group-containing monomer having no (meth) acryloyl group include aromatic vinyl monomers such as styrene and α-methylstyrene, vinyl cyanide monomers such as acrylonitrile, and vinyl acetate. A vinyl ester is mentioned.
From the viewpoint of transparency and low water absorption, (meth) acrylic monomers containing an alicyclic structure are preferred, and isobornyl (meth) acrylate, dicyclopentanyl (meth) acrylate, and adamantyl (meth) acrylate are more preferred.

  The blending amount of the vinyl group-containing monomer other than the (B) component and the (D) component is relative to the total amount of the (A) component, the (B) component, and the (D) component in terms of the transparency of the cured product. 30 mass% or less is preferable, 20 mass% or less is more preferable, and 10 mass% or less is more preferable.

(Silica fine particles, silsesquioxane compounds)
Silica fine particles or silsesquioxane compounds are used to suppress thermal deformation of the cured product and deterioration due to heat or light.
In the case of silica fine particles, the dispersibility in the curable resin composition is good and the transparency of the cured product is good. Therefore, the mass average particle diameter is preferably 1 to 300 nm, and reactive by chemical modification. What introduced the double bond is more preferable. Examples of the chemical modification method include a method of reacting colloidal silica with a compound having a reactive double bond and an alkoxysilane structure by a hydrolysis reaction.
Specific examples of the compound having a reactive double bond and an alkoxysilane structure include 3- (meth) acryloxypropyltrimethoxysilane, 3- (meth) acryloxypropyltriethoxysilane, vinyltrimethoxysilane, and vinyltrimethoxysilane. An ethoxysilane etc. are mentioned. Because of the high reactivity with colloidal silica at the time of chemical modification, and the silica fine particles into which the resulting reactive double bond is introduced have high reactivity with the components (A), (B) and (D). , 3- (meth) acryloxypropyltrimethoxysilane is preferably used.

  As the silsesquioxane compound, those having a reactive double bond are preferable. As the reactive double bond, a (meth) acryloyl group is preferable. Examples of the silsesquioxane compound having a (meth) acryloyl group include “AC-SQTA-100”, “AC-SQSI-20”, “MAC-SQTM-100”, “MAC-SI” manufactured by Toagosei Co., Ltd. -20 "(all are trade names).

[Method for producing curable resin composition]
As a method for producing the curable resin composition, for example, a double bond introduction reaction to the base polymer is performed in the component (B), and after obtaining a mixture of the component (A) and the component (B), at room temperature, (C) A component, (D) component, and another component are added suitably, and it stirs and mixes, The method of obtaining curable resin composition, etc. are mentioned.

<Hardened product>
The cured product of the present invention is produced by curing the above-described curable resin composition.
As a curing method for the curable resin composition, any one of thermal polymerization, photopolymerization, and redox reaction is selected depending on the type of the component (C) to be used.

  Although the curing conditions in the thermal polymerization method are not particularly limited, it is preferable that the curing temperature is lower than the boiling point of the component (B) in order to obtain a cured product that does not contain bubbles. As specific curing temperature (heating temperature), 40-200 degreeC is preferable and 60-150 degreeC is more preferable.

  In the photopolymerization method, the wavelength of light applied to the curable resin composition is not particularly limited, but it is preferable to irradiate ultraviolet rays having a wavelength of 200 to 400 nm. Specific examples of the ultraviolet light source include an ultrahigh pressure mercury lamp, a high pressure mercury lamp, a metal halide lamp, and a high power metal halide lamp.

When producing a cured product, curing may be performed while molding into a desired shape to obtain a molded product made of the main cured product.
Examples of the molding method include a potting molding method, a casting molding method, a printing molding method, a LIM (Liquid Injection Molding) method, and a transfer molding method.

When producing a cured product, it is preferable that after-curing is performed after the curable resin composition is cured by a thermal polymerization method or a photopolymerization method. Thereby, the amount of unreacted (meth) acryloyl groups remaining in the cured product can be reduced, and the heat resistance and weather resistance of the cured product can be improved.
As after-curing conditions, 0.1 to 24 hours are preferable at 70 to 150 ° C, and 0.5 to 10 hours are more preferable at 80 to 130 ° C.

<Optical member>
The optical member of the present invention is produced by molding the above cured product. The molding may be performed after the curable resin composition is cured, or may be performed simultaneously with the curing.
Examples of the optical member include a lens, a sheet, a film, a coating material, an optical waveguide, a sealing material, a filler, an adhesive, a reflective material, an adhesive, a wavelength conversion material, and glass fiber reinforced plastic.
Among these, a camera lens, a light emitting diode lens, and a phosphor sheet, which are required to have higher transparency, low water absorption, and reflow resistance, are preferable.

Specifically, as a lens, a camera lens provided in an electronic device such as a mobile phone, a smartphone, a personal computer, a digital camera, or an automobile, or a light guide, condensing or diffusing light emitted from a light emitting diode. The lens for light emitting diodes used is mentioned.
Examples of the lens molding method include a casting molding method, a transfer molding method, a LIM method, and the like. The lens can be a single molded product of a cured product, but can also be used as a hybrid lens material by molding a cured product on a flat glass or glass wafer.
The curing method for molding the lens is preferably thermal polymerization or photopolymerization because transparency is improved.

The phosphor sheet is used for, for example, a light emitting diode or a solar cell. In the phosphor sheet, the cured product serves as a binder for dispersing the phosphor.
Conventionally, phosphors of white light emitting diodes are dispersed in a sealing material. However, there is a problem that the phosphor easily deteriorates due to heat generated by the light emitting diode element. Therefore, if a phosphor sheet is used, the phosphor can be isolated from the heat source by using a remote phosphor type light emitting diode in which the phosphor is isolated from the light emitting diode element that is a heat source. Can be
Moreover, since the wavelength of light can be converted into a wavelength with high conversion efficiency by providing the phosphor sheet on the surface layer of the solar cell, the photoelectric conversion efficiency of the solar cell can be improved.
Examples of the method for forming the phosphor sheet include a casting molding method, a transfer molding method, a LIM method, and the like.

<Optical device>
The optical device of the present invention includes the above-described optical member.
Optical devices include cameras (including camera modules), light-emitting diode devices, mobile phones, smartphones, organic electroluminescence (organic EL) devices, flat panel displays, touch panels, electronic paper, photodiodes, phototransistors, solar cells, etc. Can be mentioned.
Among these, camera modules and light-emitting diode devices that require higher transparency, low water absorption, and reflow resistance are preferable. Hereinafter, a camera module and a light emitting diode device will be described with reference to FIGS.

A camera module 100 shown in FIG. 1 is obtained by laminating a lens holder 2 having camera lenses 1a and 1b and an infrared cut filter 5 on a substrate 3 having a sensor chip 4 and bonding wires 6a and 6b. The camera lenses 1a and 1b are optical members made of the cured product of the present invention. The camera lens may be one or more.
Other camera module embodiments include those molded by a wafer level method of dicing a bonded laminate of a lens molded into a wafer and an image sensor wafer.

  A light emitting diode device 200 shown in FIG. 2 includes a light emitting diode element 14, a package substrate 12 having an electrode (anode) 11a and an electrode (cathode) 11b formed on the surface, and reflectors 10a and 10b provided on the package substrate 12. And comprising. The light-emitting diode element 14 is disposed on the bottom of the recess formed by the package substrate 12 and the reflectors 10a and 10b via the die bonding material 13, and the electrode (anode) 11a and the electrode (cathode) 11b by the bonding wires 9a and 9b. Connected to form a package. A light emitting diode sealing material 7 is filled in the recess of the package, and the light emitting diode element 14 is sealed. In addition, a light emitting diode lens 8 is provided on the upper surfaces of the light emitting diode sealing material 7 and the reflectors 10a and 10b. The light emitting diode lens 8 is an optical member made of the cured product of the present invention.

  The light emitting diode device 300 shown in FIG. 3 includes a light emitting diode element 14, a package substrate 12 having electrodes (anodes) 11a and electrodes (cathodes) 11b formed on its surface, and reflectors 10a and 10b provided on the package substrate 12. And comprising. The light-emitting diode element 14 is disposed on the bottom of the recess formed by the package substrate 12 and the reflectors 10a and 10b via the die bonding material 13, and the electrode (anode) 11a and the electrode (cathode) 11b by the bonding wires 9a and 9b. Connected to form a package. A light emitting diode sealing material 7 is filled in the recess of the package, and the light emitting diode element 14 is sealed. Moreover, the phosphor sheet 15 is installed on the upper surfaces of the light-emitting diode sealing material 7 and the reflectors 10a and 10b. The phosphor sheet 15 is an optical member made of the cured product of the present invention.

Hereinafter, the present invention will be specifically described by way of examples. In the following description, “part” means “part by mass”.
<Evaluation method>
The mass average molecular weight, acid value, double bond equivalent, transparency, water absorption rate, and reflow resistance in Examples and Comparative Examples were evaluated by the following methods.

[Mass average molecular weight]
Each of the produced base polymers 1 to 5 was dissolved in a solvent (tetrahydrofuran), and the molecular weight was measured using gel permeation chromatography. A value obtained by converting the measured molecular weight with polystyrene was defined as a mass average molecular weight.

[Acid value]
The produced base polymers 1 to 4 and resin solutions 1 to 14 were dissolved in a mixed solvent of acetone and ethanol, respectively, and the number of mg of potassium hydroxide neutralizing 1 g of the base polymer was measured to obtain an acid value. The acid value of the base polymers 1 to 4 was “initial acid value”, and the acid value of the base polymer in the resin liquids 1 to 12 and 14 was “post-reaction acid value”.

[Double bond equivalent]
The double bond equivalent was evaluated using the following formula (1).
Double bond amount per gram (mol) = {(initial acid value−acid value after reaction) / (molecular weight of potassium hydroxide)} / 1000
Double bond equivalent (g / mol) = 1 / (double bond amount per 1 g) Formula (1)

[transparency]
The obtained cured product having a thickness of 3 mm was evaluated by haze. Haze was measured with a haze meter (manufactured by Murakami Color Research Laboratory, model HM-150), and transparency was evaluated according to the following criteria.
(Evaluation criteria)
A: Haze is less than 1.5%.
○: Haze is 1.5% or more and less than 2.0%.
Δ: Haze is 2.0% or more and less than 3.0%.
X: Haze is 3.0% or more.

[Water absorption rate]
The following water absorption test was conducted. The obtained cured product was cut into a width of 20 mm, a length of 20 mm, and a thickness of 3 mm, dried at 90 ° C. for 20 hours, and then mass was measured. This mass was defined as the pre-test mass. After the mass measurement, the cured product was stored in an environment of 85 ° C. and 85% RH for 168 hours. The mass after storage was defined as the mass after the test. The water absorption was calculated using the following formula (2) and evaluated according to the following criteria.
Water absorption rate = {(mass after test−mass before test) / mass before test} × 100 (2)
(Evaluation criteria)
A: Water absorption is less than 0.5%.
○: Water absorption is 0.5% or more and less than 1.0%.
Δ: Water absorption is 1.0% or more and less than 1.5%.
X: Water absorption is 1.5% or more.

[Reflow resistance]
In the water absorption measurement, evaluation was performed using a sample whose mass was measured after the water absorption test. Evaluation of reflow resistance is performed using a reflow simulator (manufactured by Malcolm Co., Ltd., SRS-1C) to give the sample a temperature (vertical axis) load over time (horizontal axis) as shown in the graph of FIG. The reflow test was conducted. Reflow resistance was evaluated by the number of foamed resin plates after one cycle.
(Evaluation criteria)
A: The number of foaming is 0.
○: The number of foams is 1 or more and less than 3.
Δ: The number of foams is 3 or more and less than 10.
X: The foaming number is 10 or more.

<Production example>
[Base polymer 1]
In a polymerization apparatus equipped with a stirrer, a cooling tube, and a thermometer, 145 parts of deionized water as a dispersion medium, and 0.5 parts of polyvinyl alcohol as a dispersion stabilizer (degree of saponification: 80%, degree of polymerization: 1,700) Was added and stirred. After the polyvinyl alcohol was completely dissolved, the stirring was stopped, and 6 parts of 2-methacryloyloxyethyl phthalate, 94 parts of phenyl methacrylate, and 2,2′-azobis (2-methylbutyronitrile) (Otsuka) as a polymerization initiator Chemical Co., Ltd., trade name: AMBN) 0.2 part, chain transfer agent as n-dodecyl mercaptan 0.4 part was added and stirred again.

Nitrogen substitution was performed under stirring, and the temperature was raised to 80 ° C. to perform polymerization. After detecting the peak of the polymerization exotherm, the temperature was raised to 95 ° C., the reaction was further carried out for 0.5 hours, and the mixture was cooled to 30 ° C. The obtained aqueous suspension was filtered through a nylon filter cloth having an opening of 45 μm, and the filtrate was washed with deionized water. After dehydration, it is dried at 40 ° C. for 24 hours, and is a granular (meth) acrylic polymer (this is referred to as “base polymer 1”. The other base polymers shown in Table 1 are similarly numbered. Obtained).
The obtained base polymer 1 had a mass average molecular weight (Mw) of 200,000. Moreover, the acid value was 8.3 mgKOH / g.

[Base polymers 2 to 5]
Except having changed into the content shown in Table 1, base polymer 2-5 was manufactured by the method similar to manufacture example 1, and the mass mean molecular weight and the acid value were measured.
Table 1 shows the amounts of the components used in the production of the base polymers 1 to 5 and the evaluation results. In addition, the usage-amount shows the ratio when the total amount of a monomer is 100 parts. Moreover, about the base polymer 5, since the chemical modification was not performed, the acid value was not measured.

[Production Example 1]
In a reaction vessel equipped with a condenser, 75 parts of phenyl methacrylate as component (B), 0.03 part of dibutylhydroxytoluene as a polymerization inhibitor, 1.6 parts of glycidyl methacrylate as a compound having a glycidyl group and a double bond, As a reaction catalyst, 0.2 part of tetrabutylammonium bromide was added. While stirring the liquid in the reaction vessel, 25 parts of base polymer 1 was added, and the temperature in the reaction vessel was raised to 95 ° C. The double bond introduction reaction to the base polymer 1 was performed by stirring for 10 hours while maintaining the temperature. After 10 hours, the mixture was cooled to room temperature to obtain a resin liquid (referred to as “resin liquid 1”. The other resin liquids shown in Tables 2 and 3 were similarly designated with numbers). . The acid value of the base polymer in the resin liquid 1 was 2.5 mgKOH / g. The double bond equivalent of the component (A) calculated from the acid value was 9700 g / mol.

[Production Examples 2 to 11 and 14]
Except having changed to the contents shown in Tables 2 to 3, resin solutions 2 to 11 and 14 were produced in the same manner as in Production Example 1, and measurement of mass average molecular weight and acid value, calculation of double bond equivalent were performed. went.
The amounts of main components used and the results are shown in Tables 2-3. In addition, the usage-amount is set to 100 parts in the total amount of (D) component when adding (D) component in base polymer, (B) component or (B ') component, and the following Tables 4-5. Show the percentage of cases.

[Production Example 12]
In a reaction vessel equipped with a condenser, 65 parts of methyl methacrylate, 0.03 part of dibutylhydroxytoluene as a polymerization inhibitor, 1.6 parts of glycidyl methacrylate as a compound having a glycidyl group and a double bond, and tetrabutylammonium as a reaction catalyst 0.2 part bromide was added. While stirring the liquid in the reaction vessel, 25 parts of base polymer 5 was added, and the temperature in the reaction vessel was raised to 95 ° C. The double bond introduction reaction to the base polymer 5 was performed by stirring for 5 hours while maintaining the temperature. After 5 hours, it was cooled to room temperature to obtain a resin liquid 12 containing no component (B). The acid value of the resin liquid 12 was 1.7 mgKOH / g. The double bond equivalent of the base polymer 5 after the reaction was 2600 g / mol.

[Production Example 13]
In a reaction vessel equipped with a cooler, 65 parts of phenyl methacrylate as component (B) and 0.03 part of dibutylhydroxytoluene as a polymerization inhibitor were added. While stirring the liquid in the reaction vessel, 25 parts of the base polymer 5 was added, the temperature in the reaction vessel was raised to 65 ° C., and the mixture was stirred for 2 hours while maintaining the temperature. After 2 hours, it was cooled to room temperature to obtain a resin liquid 13. The polymer (base polymer 5) having no polymerizable double bond in the side chain in the resin liquid 13 is referred to as component (A ′).

<Example>
[Example 1]
N-Octadecyl-3- (3 ′, 5′-di-t-butyl-4′-hydroxyphenyl) propionate (manufactured by BASF Japan Ltd., trade name: IRGANOX (registered trademark)) as an antioxidant for the resin liquid 1 1076) 0.2 part, (C) as component 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate (NOF Corporation, trade name: Perocta O) 2 parts, The mixture was stirred at room temperature for 30 minutes to obtain a curable resin composition.
After defoaming the obtained curable resin composition, two glass coated with a polyethylene terephthalate (PET) film are opposed so that the PET film faces each other, and vinyl chloride is placed at the end of the gap between the two glass plates. It was poured into a cell formed by sandwiching a resin gasket and sealed. The cell having the curable resin composition was cured by heating at 70 ° C. for 5 hours, and after-curing was further performed at 100 ° C. for 1 hour. Next, after cooling the cell to room temperature, the glass and the PET film on both sides of the cell were peeled off to obtain a cured product having a thickness of 3 mm. Each evaluation was implemented using the obtained hardened | cured material. The results are shown in Table 4.

[Example 9]
N-Octadecyl-3- (3 ′, 5′-di-t-butyl-4′-hydroxyphenyl) propionate (manufactured by BASF Japan Ltd., trade name: IRGANOX 1076) 0.2 as an antioxidant in the resin liquid 3 Part, 2 parts of IRGACURE 184: 1-hydroxycyclohexyl phenyl ketone (manufactured by BASF, trade name: IRGACURE (registered trademark) 184) was added as component (C) and stirred at room temperature for 30 minutes to obtain a curable resin composition. .
After defoaming the obtained curable resin composition, it was poured into a cell formed by sandwiching a gasket made of vinyl chloride resin at the end of the gap between the two glass plates and sealed. After irradiating UV light with an integrated light quantity of 1000 mJ / cm ² using a metal halide lamp from one side of the glass surface, further irradiating UV light with an integrated light quantity of 1000 mJ / cm ² using a metal halide lamp from the other glass surface, Heated at 100 ° C. for 30 minutes. Next, after cooling the cell to room temperature, the glass on both sides of the cell was peeled off to obtain a cured product having a thickness of 3 mm. Each evaluation was implemented using the obtained hardened | cured material. The results are shown in Table 4.

[Examples 2 to 8, 10 to 18 and Comparative Examples 1 and 2]
Except having changed the used component into the thing of Tables 4-5, the curable resin composition and hardened | cured material were produced similarly to Example 1, and each evaluation was implemented.
Tables 4 to 5 show blending amounts and evaluation results of main components in the curable resin composition. In addition, a compounding quantity shows the ratio when the total amount of (A) component or (A ') component, (B) component or (B') component, and (D) component is 100 parts.

As shown in Tables 4 to 5, all of the cured products of Examples 1 to 18 were highly transparent, had a low water absorption rate, and were excellent in reflow resistance.
On the other hand, since the cured product of Comparative Example 1 uses methyl methacrylate ((B ′) component) having no aromatic ring structure instead of the (B) component, the water absorption is high, and transparency and reflow resistance are high. It was bad.
Moreover, since the cured product of Comparative Example 2 used a (meth) acrylic polymer ((A ′) component) having no polymerizable double bond in the side chain instead of the (A) component, the reflow resistance Was bad.

Abbreviations in Tables 1 to 5 are as follows.
PHMA: Phenyl methacrylate.
PA: 2-methacryloyloxyethyl phthalate.
MAA: methacrylic acid.
MMA: methyl methacrylate.
AMBN: 2,2′-azobis (2-methylbutyronitrile).
GMA: glycidyl methacrylate.
BZMA: benzyl methacrylate.
PHOEtMA: Phenoxyethyl methacrylate.
BHT: Dibutylhydroxytoluene.
TBAB: tetrabutylammonium bromide.
TPP: triphenylphosphine.
POO: 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate (manufactured by NOF Corporation, trade name: Perocta O, 10 hour half-life temperature = 65.3 ° C.).
IRGACURE184: 1-hydroxycyclohexyl phenyl ketone (manufactured by BASF, trade name: IRGACURE184).
DCP-A: tricyclodecane dimethanol diacrylate (manufactured by Kyoeisha Chemical Co., Ltd., trade name: light acrylate DCP-A).
PBOM: Polybutylene glycol dimethacrylate, polymerization degree n = 8-9 (Mitsubishi Rayon Co., Ltd., trade name: Acryester PBOM).
PPOM: Polypropylene glycol dimethacrylate, degree of polymerization n≈7 (manufactured by NOF Corporation, trade name: BLEMMER (registered trademark) PDP-400N).
M-327: ε-caprolactone-modified tris (acryloxyethyl) isocyanurate (manufactured by Toagosei Co., Ltd., trade name: Aronix (registered trademark) M-327).
EA-0200: 9,9-bis [4- (2- (meth) acryloyloxyethoxy) phenyl] fluorene (manufactured by Osaka Gas Chemicals, trade name: OGSOL (registered trademark) EA-0200).
IRGANOX1076: n-octadecyl-3- (3 ′, 5′-di-t-butyl-4′-hydroxyphenyl) propionate (manufactured by BASF Japan Ltd., trade name: IRGANOX1076).

  DESCRIPTION OF SYMBOLS 1a Camera lens; 1b Camera lens; 2 Lens holder; 3 Substrate; 4 Sensor chip; 5 Infrared cut filter; 6a Bonding wire; 6b Bonding wire; 7 Light emitting diode sealing material; 8 Light emitting diode lens; 9b bonding wire; 10a reflector; 10b reflector; 11a electrode (anode); 11b electrode (cathode); 12 package substrate; 13 die bonding material; 14 light-emitting diode element; 15 phosphor sheet; 100 camera module using camera lens; Light emitting diode device using lens for light emitting diode; 300 Light emitting diode device using phosphor sheet

Claims (8)

  (Meth) acrylic polymer (A) having a polymerizable double bond in the side chain, monofunctional (meth) acrylic polymerizable monomer (B) having an aromatic ring structure, and radical polymerization initiator (C) A curable resin composition containing   With respect to the total amount of the (meth) acrylic polymer (A) having a polymerizable double bond in the side chain and the monofunctional (meth) acrylic polymerizable monomer (B) having the aromatic ring structure, 5 to 80% by mass of the (meth) acrylic polymer (A) having a polymerizable double bond in the side chain, and a monofunctional (meth) acrylic polymerizable monomer (B) having the aromatic ring structure The curable resin composition of Claim 1 containing 20-95 mass%.   Furthermore, the curable resin composition of Claim 1 or 2 containing a polyfunctional (meth) acrylic-type polymerizable monomer (D).   The (meth) acrylic polymer (A) having a polymerizable double bond in the side chain, the monofunctional (meth) acrylic polymerizable monomer (B) having the aromatic ring structure, and the polyfunctional ( 5-50% by mass of the (meth) acrylic polymer (A) having a polymerizable double bond in the side chain with respect to the total amount of the (meth) acrylic polymerizable monomer (D), the aromatic ring structure 20 to 94% by mass of the monofunctional (meth) acrylic polymerizable monomer (B) having 1 to 50% by mass of the polyfunctional (meth) acrylic polymerizable monomer (D). The curable resin composition according to claim 3.   Furthermore, the curable resin composition as described in any one of Claims 1-4 containing fluorescent substance.   Hardened | cured material formed by hardening | curing the curable resin composition as described in any one of Claims 1-5.   An optical member comprising the cured product according to claim 6.   An optical device comprising the optical member according to claim 7.

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