# US 4,393,147 A · Expandable polymeric styrene particles

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- Number: US 4,393,147 A
- Document ID: US4393147A
- Status: Granted
- Kind: A
- Application number: 06/443,309
- Filed: 1982-11-22
- Granted: 1983-07-12
- Earliest claimed: 1982-11-22
- Assignees: Cosden Technology, Inc.
- Inventors: Richard A. Schwarz
- Web page: https://patentgrep.com/patent/US4393147A

## CPC

- C08J 9/0028: {containing nitrogen}
- C08J 9/0019: {halogenated}
- C08J 2325/00: 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 at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
- Y10S 521/907: Nonurethane flameproofed cellular product
- 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)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

An improved expandable polymeric styrene particle is provided containing a blowing agent and a minor amount of ethylene-bis-stearamide and dibromoethyldibromocyclohexane. The improved particle results in a significantly reduced final mold cooling cycle in producing the finished molded article. Ethylene-bis-stearamide and dibromoethyldibromocyclohexane can be incorporated during impregnation with the blowing agent or by blending with the expandable particles after impregnation.

## Claims

### Claim 1

An expandable polymeric styrene particle having incorporated therein a blowing agent and a from about 0.1% to about 1.0% of ethylene-bis-stearamide and a from about 1% to about 1.5% of dibromoethyldibromocyclohexane, all percentages being based upon the weight of the polymeric styrene.

### Claim 2 (depends on 1)

The particle of claim 1 wherein the polymeric styrene is polystyrene.

### Claim 3 (depends on 2)

The particle of claim 2 wherein the blowing agent is pentane.

### Claim 4

In a process for producing an expandable polymeric styrene particle wherein a polymeric styrene particle is impregnated with a blowing agent and the resultant expandable polymeric styrene particle recovered, the improvement which comprises impregnating the polymeric styrene particle with a from about 0.1% to about 1.0% of ethylene-bis-stearamide and a from about 1% to about 1.5% of dibromoethyldibromocyclohexane, all percentages being based upon the weight of the polymeric styrene during impregnation of said polymer with said blowing agent.

### Claim 5 (depends on 1)

The process of claim 1 wheren the polymeric styrene is polystyrene.

### Claim 6 (depends on 5)

The process of claim 5 wherein the blowing agent is pentane.