Thermoplastic elastomer blend of EPDM, polyethylene, and a C.sub.3 -C.sub.1 6
AssigneeCopolymer Rubber & Chemical Corporation
InventorsGeorge A. Von Bodungen, Curtis L. Meredith
Life of this patent
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Abstract
A thermoplastic elastomer which is ideally suited for use in the fabrication of premium grade hose and other uses because of its smooth, soft and rubbery feel under widely varying temperature conditions, coupled with its exceptionally low compression set and good flexibility.
Claims26
A thermoplastic elastomer formed of (1) an EPDM interpolymer of ethylene, a monoolefin containing from 3-16 carbon atoms, and a polyene, (2) a polymer of a monoolefin monomer containing 3-16 carbon atoms, and (3) polyethylene in which the polyethylene is present in an amount greater than 15% but not more than 25% by weight, with the remainder of 70% to less than 85% by weight divided between the EPDM interpolymer and the monoolefin polymer in the ratio of 90-10 parts by weight of EPDM polymers to 10-90 parts by weight of monoolefin polymers, said components in admixture being subjected to free radical reaction during hot working in the presence of a free radical generating catalyst.
A method for preparing a thermoplastic elastomer comprising admixing an EPDM interpolymer, a polymer of a monoolefin having from 3-16 carbon atoms and polyethylene, in which the polyethylene is present in an amount greater than 15% but not in excess of 25% by weight of the polymer total, and hot working the mixture in the presence of a free radical generating catalyst to effect free radical reaction during the hot mixing step.
Dependencies are inferred from the claim text.