Ethylene copolymer - modified dynamically vulcanized alloys
AssigneeAdvanced Elastomer Systems, L. P.
InventorsRobert C. Puydak, Donald R. Hazelton
Life of this patent
Estimating the term…
Abstract
A dynamically vulcanized composition is provided which comprises a polyolefin resin, an elastomer, and an ethylene copolymer resin such as a copolymer of ethylene and vinyl acetate or an alkyl acrylate. A process for producing the dynamically vulcanized composition is also provided, which process includes the addition of the ethylene copolymer resin after the dynamic vulcanization step. The resulting composition comprises the ethylene copolymer resin predominantly in the polyolefin resin phase. The compositions have improved surface appearance and softness.
Claims26
A dynamically vulcanized composition comprising:
- (a) a cured elastomer selected from the group consisting of a copolymer of a C.sub.4 to C.sub.7 isomonoolefin and C.sub.4 to C.sub.14 multiolefin, a halogenated copolymer of a C.sub.4 to C.sub.7 isomonoolefin and a C.sub.4 to C.sub.14 multiolefin, a halogenated copolymer of a C.sub.4 to C.sub.7 isomonoolefin and a para-alkylstyrene, ethylene-propylene-diene rubber, polyisoprene polychloroprene, styrene-butadiene rubber, nitrile rubber, chlorosulfonated polyethylene, and mixtures thereof;
- (b) a thermoplastic polyolefin resin other than (c);
- (c) an ethylene copolymer resin selected from the group consisting of a copolymer of ethylene and vinyl acetate, a copolymer of ethylene and an alkyl ester of an alpha, beta monoethylenically unsaturated monocarboxylic acid, a copolymer of ethylene and an alpha, beta monoethylenically unsaturated monocarboxylic acid and mixtures thereof, at least a major portion of said ethylene copolymer resin being present in said thermoplastic polyolefin resin, said ethylene copolymer resin having been added to the dynamically vulcanized mixture of said elastomer and said polyolefin resin after said elastomer had been sufficiently cured to prevent penetration of a major portion of said ethylene copolymer resin into said elastomer.
A process for producing a dynamically vulcanized composition, which comprises the steps of:
- (a) dynamically vulcanizing a thermoplastic polyolefin resin other than an ethylene copolymer resin, and an elastomer selected from the group consisting of a copolymer of a C.sub.4 to C.sub.7 isomonoolefin and a C.sub.4 to C.sub.14 multiolefin, a halogenated copolymer of a C.sub.4 to C.sub.7 isomonoolefin and a C.sub.4 to C.sub.14 multiolefin, a halogenated copolymer of a C.sub.4 to C.sub.7 isomonoolefin and a para-alkylstyrene, ethylene-propylene-diene rubber, polyisoprene, polychloroprene, styrene-butadiene rubber, nitrile rubber, chlorosulfonated polyethylene, and mixtures thereof, in the presence of a curing agent for said elastomer, at dynamic vulcanization conditions to produce a dynamically vulcanized mixture;
- (b) adding an ethylene copolymer resin selected from the group consisting of a copolymer of ethylene and vinyl acetate, a copolymer of ethylene and an alkyl ester of an alpha, beta monoethylenically unsaturated monocarboxylic acid, a copolymer of ethylene and an alpha, beta monoethylenically unsaturated carboxylic acid, and mixtures thereof to said dynamically vulcanized mixture resulting from step (a), said dynamic vulcanization step (a) having been conducted at conditions such as to cure said elastomer sufficiently to produce a dynamically vulcanized composition comprising the major portion of said ethylene copolymer resin in said polyolefin resin.
Dependencies are inferred from the claim text.