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US 4,304,887 AGranted
Ethylene/carboxylic acid copolymers
AssigneeE. I. Du Pont de Nemours and Company
InventorGordon M. Cohen
Life of this patent
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Abstract
Improved mill release properties and green strength of elastomeric copolymers derived from ethylene, alkyl acrylates or vinyl esters of carboxylic acids, and .alpha.,.beta.-unsaturated mono- or dicarboxylic acids, and optionally containing segments derived from carbon monoxide, sulfur dioxide or acrylonitrile, is achieved by including in such copolymers a small quantity of certain chromium (III) compounds.
Claims21
An elastomeric copolymer derived from component monomers comprising:
- (a) 25-70 weight percent ethylene,
- (b) 25-70 weight percent of at least one compound selected from the group consisting of C.sub.1 -C.sub.8 alkyl esters of acrylic acid and vinyl esters of C.sub.2 -C.sub.8 carboxylic acids, and
- (c) at least one .alpha.,.beta.-unsaturated carboxylic acid of 3-12 carbon atoms selected from the group consisting of monocarboxylic acid, dicarboxylic acids and monoesters of dicarboxylic acids, in an amount to provide 0.1-10 weight percent of --COOH groups,
- which has been modified by incorporating therein component
- (d) 1-20 milliequivalents per 100 grams of copolymer of at least one chromium (III) compound selected from the group consisting of chromium (III) carboxylates of the formula
- (RCOO).sub.3 Cr
- where R is an acyclic alkyl group of 1-20 carbon atoms or an acyclic alkenyl group of 3-20 carbon atoms in which the .alpha.-carbon is saturated, and tris(2'-hydroxyacetophenono) chromium.
4 more elements
Dependencies are inferred from the claim text.