# US 2014/0155507 A1 · Resin foam and process for producing the same

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- Number: US 2014/0155507 A1
- Document ID: US20140155507A1
- Status: Published application
- Kind: A1
- Application number: 14/236,749
- Filed: 2012-07-24
- Published: 2014-06-05
- Earliest claimed: 2011-08-02
- Assignees: Nitto Denko Corporation
- Inventors: Mitsuhiro Kanada; Mie OTA; Yoshinori Kouno; Hironori Yasuda; Yuko Kandori
- Web page: https://patentgrep.com/patent/US20140155507A1

## CPC

- C08L 33/00: Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08J 9/0023: {containing oxygen}
- C08L 33/08: Homopolymers or copolymers of acrylic acid esters
- C08J 2201/026: Crosslinking before of after foaming
- C08J 2333/00: Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08L 33/06: of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
- C08L 2203/14: used for foams
- C08L 2312/00: Crosslinking
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)

## Abstract

Provided is a resin foam that is satisfactorily flexible and highly resistant to heat, exhibits superior strain recoverability at high temperatures, and has a high instantaneous recovery rate. This resin foam is formed from a resin composition containing an acrylic polymer, an active-energy-ray-curable compound having two (meth)acryloyl groups per molecule, an active-energy-ray-curable compound having three or more (meth)acryloyl groups per molecule, and a thermal crosslinking agent. The active-energy-ray-curable compound having two (meth)acryloyl groups per molecule and the active-energy-ray-curable compound having three or more (meth)acryloyl groups per molecule are preferably contained in a total content of from 20 to 150 parts by weight per 100 parts by weight of the acrylic polymer.

## Claims

### Claim 1

A resin foam formed from a resin composition, the resin composition comprising: an acrylic polymer; an active-energy-ray-curable compound having two (meth)acryloyl groups per molecule; an active-energy-ray-curable compound having three or more (meth)acryloyl groups per molecule; and a thermal crosslinking agent.

### Claim 2 (depends on 1)

The resin foam according to claim 1, wherein the resin composition comprises the active-energy-ray-curable compound having two (meth)acryloyl groups per molecule and the active-energy-ray-curable compound having three or more (meth)acryloyl groups per molecule in a total content of from 20 to 150 parts by weight per 100 parts by weight of the acrylic polymer.

### Claim 3 (depends on 1)

The resin foam according to claim 1, wherein the resin composition comprises the thermal crosslinking agent in a content of from 0.2 to 10 parts by weight per 100 parts by weight of the acrylic polymer.

### Claim 4 (depends on 1)

The resin foam according to claim 1, wherein the resin composition further comprises a radical scavenger.

### Claim 5 (depends on 4)

The resin foam according to claim 4, wherein the radical scavenger is at least one selected from the group consisting of phenolic antioxidants, phenolic age inhibitors, amine antioxidants, and amine age inhibitors.

### Claim 6 (depends on 4)

The resin foam according to claim 4, wherein the resin composition comprises the radical scavenger in a content of from 0.05 to 10 parts by weight per 100 parts by weight of the acrylic polymer.

### Claim 7 (depends on 1)

The resin foam according to claim 1, which is formed by subjecting the resin composition to expansion molding to give a foamed article; and irradiating the foamed article with an active energy ray.

### Claim 8 (depends on 1)

A process for producing the resin foam of claim 1, the process comprising the steps of: subjecting the resin composition to expansion molding to give a foamed article; and irradiating the foamed article with an active energy ray to give a resin foam.