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US 4,391,922 AGranted
Blowing agents as curatives for ethylene/carbon monoxide copolymers
AssigneeE. I. Du Pont de Nemours and Company
InventorJerald R. Harrell
Life of this patent
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Abstract
Mono- and polyazoformamide, sulfonyl hydrazide, sulfonyl semicarbazide and/or dinitrosomethylene amine compounds act as chemical blowing agents and curatives for carbon monoxide-containing ethylene copolymers.
Claims10
A foamable composition comprising
- (a) a copolymer having a melt index of 0.1 to 500 of (i) ethylene (ii) about 1 to 25 weight percent carbon monoxide based on the copolymer (iii) 1 to 75 weight percent based on the copolymer, of a softening monomer selected from the group consisting of alkyl acrylates and methacrylates 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 esters wherein the alkyl group contains 1 to 18 carbon atoms;
- and
- (b) 2 to 20 weight percent based on the copolymer of a blowing agent curative selected from the group consisting of mono- and polyazoformamide compounds, sulfonyl hydrazide compounds, sulfonyl semicarbazide compounds and dinitrosomethyleneamine compounds.
Dependencies are inferred from the claim text.