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US 4,391,923 AGranted
Low density closed-cell foamed articles from ethylene copolymer/vinyl or vinylidene halide blends
AssigneeE. I. Du Pont de Nemours and Company
InventorJohn Rys-Sikora
Life of this patent
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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.
Claims13
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.
6 more elements
Dependencies are inferred from the claim text.