# US 9,434,830 B2 · Expandable acrylic resin bead, expanded acrylic resin bead, foamed molded article of expanded acrylic resin beads

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- Number: US 9,434,830 B2
- Document ID: US9434830B2
- Status: Granted
- Kind: B2
- Application number: 14/661,614
- Filed: 2015-03-18
- Published: 2015-10-01
- Granted: 2016-09-06
- Earliest claimed: 2014-03-25
- Assignees: Jsp Corporation
- Applicants: Jsp Corporation
- Inventors: Jumpei Goto; Yota Kuwada
- Web page: https://patentgrep.com/patent/US9434830B2

## CPC

- C08J 9/228: Forming foamed products
- C08J 9/141: {Hydrocarbons}
- C08J 9/18: by impregnating polymer particles with the blowing agent
- C08J 9/224: Surface treatment
- C08J 9/232: by sintering expandable particles
- C08J 2201/036: Use of an organic, non-polymeric compound to impregnate, bind or coat a foam, e.g. fatty acid ester
- C08J 2203/14: Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
- C08J 2207/00: Foams characterised by their intended use
- C08J 2333/12: Homopolymers or copolymers of methyl methacrylate
- 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 are: expandable acrylic resin bead and expanded acrylic resin bead, both having excellent moldability and capable of providing a foamed molded article that generates less soot during combustion and has a low decomposition gas generation speed; and a foamed molded article obtained through in-mold molding the expanded acrylic resin beads. The expandable acrylic resin bead is composed of an acrylic resin and a physical blowing agent impregnated therein. The acrylic resin contains a methacrylic ester component (A) and an acrylic ester component (B). The content of the component (A) is 85 to 99 mol % with respect to a total 100 mol % of the component (A) and the component (B). At least one of the component (A) and the component (B) contains a component having a polycyclic saturated hydrocarbon group. The glass transition temperature of the acrylic resin is 112 to 125° C.

## Claims

### Claim 1

An expandable acrylic resin bead comprising:
an acrylic resin having a glass transition temperature of 112 to 125° C.; and
a physical blowing agent;
wherein the acrylic resin comprises
a methacrylic ester component (A) and an acrylic ester component (B),
a content of the component (A) being 85 to 99 mol % with respect to a total 100 mol % of the component (A) and the component (B), and
at least one of the component (A) and the component (B) containing a component having a polycyclic saturated hydrocarbon group.

### Claim 2 (depends on 1)

The expandable acrylic resin bead according to claim 1, wherein the acrylic resin is a copolymer of the component (A) and the component (B).

### Claim 3 (depends on 1)

The expandable acrylic resin bead according to claim 1, wherein a content of the component having the polycyclic saturated hydrocarbon group in the acrylic resin is not more than 20 mol % with respect to the total 100 mol % of the component (A) and the component (B).

### Claim 4 (depends on 1)

The expandable acrylic resin bead according to claim 1, wherein the polycyclic saturated hydrocarbon group is dicyclopentanyl group, adamantyl group, norbornyl group, or isobornyl group.

### Claim 5 (depends on 1)

The expandable acrylic resin bead according to claim 1, wherein a weight-average molecular weight of the acrylic resin is 50,000 to 300,000.

### Claim 6 (depends on 1)

An expanded acrylic resin bead obtained by expansion of the expandable acrylic resin bead according to claim 1.

### Claim 7 (depends on 2)

An expanded acrylic resin bead obtained by expansion of the expandable acrylic resin bead according to claim 2.

### Claim 8 (depends on 3)

An expanded acrylic resin bead obtained by expansion of the expandable acrylic resin bead according to claim 3.

### Claim 9 (depends on 4)

An expanded acrylic resin bead obtained by expansion of the expandable acrylic resin bead according to claim 4.

### Claim 10 (depends on 5)

An expanded acrylic resin bead obtained by expansion of the expandable acrylic resin bead according to claim 5.

### Claim 11 (depends on 6)

A foamed molded article obtained by in-mold molding the expanded acrylic resin beads according to claim 6.

### Claim 12 (depends on 7)

A foamed molded article obtained by in-mold molding the expanded acrylic resin beads according to claim 7.

### Claim 13 (depends on 8)

A foamed molded article obtained by in-mold molding the expanded acrylic resin beads according to claim 8.

### Claim 14 (depends on 9)

A foamed molded article obtained by in-mold molding the expanded acrylic resin beads according to claim 9.

### Claim 15 (depends on 10)

A foamed molded article obtained by in-mold molding the expanded acrylic resin beads according to claim 10.