Ethylene-vinyl acetate copolymer rubbers
AssigneeNational Distillers and Chemical Corporation
InventorsJoseph Fischer, John M. Hoyt
Life of this patent
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Abstract
The Mooney viscosity and green strength of ethylene-vinyl acetate (EVA) copolymer gum stock is improved by the addition thereto of a suitable elastomer such as: high viscosity ethylene propylene rubber (EPR); nitrile rubber; polychloroprene; polyacrylate rubber; polyurethane; chlorinated polyethylene; polyester; ethylene-propylene diene monomer (EPDM) terpolymer; and other elastomers such as ethylene-methyl acrylate, ethylene butyl acrylate and acrylonitrile types.
Claims9
A polymer blend demonstrating improved Mooney viscosity and green strength comprising from about 90% to about 60% by weight of an amorphous ethylenevinyl acetate copolymer containing from about 40% to about 70% copolymerized vinyl acetate by weight, and from about 10% to about 40% by weight of a modifying elastomer having a Mooney viscosity of from about 65 to about 115 ML.sub.1+4 at 100.degree. C. wherein the modifying elastomer is selected from the group consisting of polychloroprene, polyacrylate rubber, polyurethane, chlorinated polyethylene, and polyester.
Dependencies are inferred from the claim text.