# US 4,394,459 A · Fast-curing foamable composition based on ethylene terpolymers

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- Number: US 4,394,459 A
- Document ID: US4394459A
- Status: Granted
- Kind: A
- Application number: 06/414,452
- Filed: 1982-09-02
- Granted: 1983-07-19
- Earliest claimed: 1981-09-18
- Assignees: E. I. Du Pont de Nemours and Company
- Inventors: John Rys-Sikora
- Web page: https://patentgrep.com/patent/US4394459A

## CPC

- C08J 9/10: developing nitrogen {, the blowing agent being a compound containing a nitrogen-to-nitrogen bond}
- C08J 9/0061: {characterized by the use of several polymeric components}
- C08J 2323/08: Copolymers of ethene (C08J2323/16 takes precedence)
- C08J 2407/00: Characterised by the use of natural rubber
- Y10S 521/909: Blowing-agent moderator, e.g. kickers
- 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

A crosslinked closed-cell microcellular article of a terpolymer of ethylene, carbon monoxide, and a softening monomer.

## Claims

### Claim 1

A crosslinked closed-cell microcellular foamed article with bulk density of at least 0.02 g/cm.sup.3 comprising a terpolymer of
(i) ethylene;
(ii) 10 to 40 percent by weight of a softening monomer selected from the group consisting of alkyl acrylates and methylacrylates having linear or branched alkyl groups of 1 to 18 carbon atoms, vinyl esters of saturated carboxylic acids having 1 to 18 carbon atoms and vinyl alkyl ethers wherein the alkyl group contains 1 to 18 carbon atoms; and
(iii) 1.0 to 20 percent by weight carbon monoxide.

### Claim 2 (depends on 1)

The foamed article of claim 1 wherein is present less than 50 percent by weight natural rubber.

### Claim 3 (depends on 1, 2)

The foamed article of claim 1 or claim 2 wherein the softening monomer is selected from the group consisting of vinyl acetate, methyl acrylate, isobutyl acrylate and methyl vinyl ether.

### Claim 4 (depends on 1, 2)

The foamed article of claim 1 or claim 2 wherein the softening monomer is vinyl acetate present in an amount equal to 15 to 30 percent by weight of the terpolymer.