# US 10,246,538 B2 · Photocurable resin composition, cured product of same and method for producing cured product

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- Number: US 10,246,538 B2
- Document ID: US10246538B2
- Status: Granted
- Kind: B2
- Application number: 15/523,736
- Filed: 2015-09-02
- Published: 2017-11-02
- Granted: 2019-04-02
- Earliest claimed: 2014-11-04
- Assignees: Three Bond Co., Ltd.
- Applicants: Three Bond Co., Ltd.
- Inventors: Yuko Takeo; Naoya Otsuki
- Web page: https://patentgrep.com/patent/US10246538B2

## CPC

- C08F 220/1811: {C10or C11-(Meth)acrylate, e.g. isodecyl (meth)acrylate, isobornyl (meth)acrylate or 2-naphthyl (meth)acrylate}
- C08F 2/44: Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
- C08F 2/48: by ultraviolet or visible light
- C08F 2/50: with sensitising agents
- C08F 290/067: {Polyurethanes; Polyureas}
- C08K 5/18: with aromatically bound amino groups
- C08F 220/346: {and further oxygen}
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

The object of the present invention is to provide a photocurable resin composition which allows obtainment of a cured product that has high concealability, while being suppressed in fading due to ultraviolet light, a cured product of the photocurable resin composition, and a method for producing a cured product. The present invention relates to a photocurable resin composition containing the following component (A) to component (D): component (A): leuco dye; component (B): photoacid generating agent; component (C): radical polymerizable compound; and component (D): α-hydroxy acetophenone-based radical initiator which has a 5% weight loss temperature (thermal decomposition temperature) in a nitrogen atmosphere of 200° C., or higher as determined by a TGA method at a temperature increase rate, of 10° C./minute.

## Claims

### Claim 1

A photocurable resin composition comprising the following component (A) to component (D):
component (A): a leuco dye;
component (B): a photoacid generating agent;
component (C): a radical polymerizable compound; and
component (D): an α-hydroxy acetophenone-based radical initiator having thermal decomposition temperature of 200° C. or higher.

### Claim 2 (depends on 1)

The photocurable resin composition according to claim 1, wherein the component (D) is comprised at 0.01 to 15 parts by mass relative to 100 parts by mass of the component (C).

### Claim 3 (depends on 1)

The photocurable resin composition according to claim 1, wherein the component (D) is 1-[4-(2-hydroxyethoxy)-phenyl]-2-hydroxy-2-methyl-1-propan-1-one or 2-hydroxy-1-{4-[4-(2-hydroxy-2-methyl-propionyl)-benzyl]phenyl}-2-methyl-propan-1-one.

### Claim 4 (depends on 1)

The photocurable resin composition according to claim 1, wherein the component (C) comprises a (meth)acryloyl group-containing oligomer and a (meth)acryloyl group-containing monomer.

### Claim 5 (depends on 1)

The photocurable resin composition according to claim 1, wherein a cured product has a black color.

### Claim 6 (depends on 1)

The photocurable resin composition according to claim 1, wherein the composition is used for a covering material, a resin for casting, a sealing agent, a potting agent, an adhesive, or a coating material.

### Claim 7 (depends on 1)

A cured product of the photocurable resin composition according to claim 1.

### Claim 8 (depends on 7)

A method for producing the cured product according to claim 7 comprising a curing step for curing the photocurable resin composition by light irradiation.

### Claim 9 (depends on 1)

The photocurable resin composition according to claim 1, wherein the component (D) comprises at least one selected from the group consisting of 1-[4-(2-hydroxyethoxy)-phenyl]-2-hydroxy-2-methyl-1-propan-1-one, 2-hydroxy-1-{4-[4-(2-hydroxy-2-methyl-propionyl)-benzyl]phenyl}-2-methyl-propan-1-one, and 2-hydroxy-2-methyl-1-[4-(1-methylvinyl)phenyl]propanone oligomer.