# US 4,391,923 A · Low density closed-cell foamed articles from ethylene copolymer/vinyl or vinylidene halide blends

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- Number: US 4,391,923 A
- Document ID: US4391923A
- Status: Granted
- Kind: A
- Application number: 06/424,449
- Filed: 1982-09-27
- Granted: 1983-07-05
- Earliest claimed: 1982-09-27
- Assignees: E. I. Du Pont de Nemours and Company
- Inventors: John Rys-Sikora
- Web page: https://patentgrep.com/patent/US4391923A

## CPC

- C08J 9/0061: {characterized by the use of several polymeric components}
- C08L 73/00: Compositions of macromolecular compounds obtained by reactions forming a linkage containing oxygen or oxygen and carbon in the main chain, not provided for in groups C08L59/00 - C08L71/00; Compositions of derivatives of such polymers
- C08J 2327/02: not modified by chemical after-treatment
- C08J 2357/00: Characterised by the use of unspecified polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C08J 2427/00: 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 a halogen; Derivatives of such polymers
- C08J 2457/00: Characterised by the use of unspecified polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C08L 27/04: containing chlorine atoms
- 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)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

The subject invention is a foamable composition based on a blend of a carbon monoxide- or sulfur dioxide-containing ethylene copolymer and a vinyl or vinylidene halide polymer, and the closed-cell foamed article produced therefrom.

## Claims

### Claim 1

A crosslinkable foamable composition comprising
(a) 5 to 95 weight percent based on polymer weight of a copolymer of
(i) ethylene;
(ii) 1 to 60 weight percent based on copolymer of a softening monomer selected from the group consisting of unsaturated mono- or dicarboxylic acids of 3-20 carbon atoms, esters of said unsaturated mono- or dicarboxylic acids, vinyl esters of saturated carboxylic acids where the acid group has 2-18 carbon atoms, vinyl alkyl ethers wherein the alkyl group has 1-18 carbon atoms, vinyl or vinylidene halides, acrylonitrile, methacrylonitrile, norbornene, alpha olefins of 3-12 carbon atoms and vinyl aromatic compounds; and
(iii) 1 to 30 weight percent based on copolymer of a member of the group consisting of carbon monoxide or sulfur dioxide;
(b) 5 to 95 weight percent based on polymer weight of a vinyl or vinylidene halide polymer; and
(c) 0.5 to 20 weight percent based on the blend of a chemical blowing agent
(d) from 0.2 to 5.0 percent based on the blend of a free-radical crosslinking agent.

### Claim 2 (depends on 1)

The composition of claim 1 wherein (a) and (b) are compatible as evidenced by optical transparency.

### Claim 3 (depends on 2)

The composition of claim 2 further containing 0.2 to 5.0 percent based on the blend of a free radical crosslinking agent.

### Claim 4 (depends on 3)

The composition of claim 3 wherein the free radical crosslinking agent is a peroxide crosslinking agent.

### Claim 5 (depends on 3)

The composition of claim 3 wherein the free radical crosslinking agent is a peroxide crosslinking agent.

### Claim 6 (depends on 1, 2, 3, 4, 5)

The composition of claim 1, 2, 3, 4 or 5 wherein (a)(iii) is carbon monoxide.

### Claim 7 (depends on 1, 2, 3, 4, 5)

The composition of claim 1, 2, 3, 4 or 5 wherein (a)(iii) is sulfur dioxide.

### Claim 8 (depends on 6)

The composition of claim 6 wherein (a)(ii) is selected from the group consisting of methyl acrylate, butyl acrylate, vinyl acetate and maleic acid monoethyl ether.

### Claim 9 (depends on 7)

The composition of claim 7 wherein (a)(ii) is selected from the group consisting of methyl acrylate, butyl acrylate, vinyl acetate and maleic acid monoethyl ether.

### Claim 10 (depends on 8, 9)

The composition of claim 8 or 9 wherein the weight percent of the vinyl or vinylidene halide polymer is at least 50.

### Claim 11 (depends on 8, 9)

The composition of claim 8 or 9 wherein the weight percent of the vinyl or vinylidene halide polymer is up to 50.

### Claim 12 (depends on 10)

The composition of claim 10 wherein the vinyl or vinylidene halide polymer is polyvinyl chloride.

### Claim 13 (depends on 11)

The composition of claim 11 wherein the vinyl or vinylidene halide polymer is polyvinyl chloride.