Dynamically cured thermoplastic olefin polymers and process for producing the same
AssigneeAdvanced Elastomer Systems, L. P.
InventorsThomas C. Yu, Robert C. Puydak, Charles W. Degener
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Abstract
A dynamically vulcanized thermoplastic composition is provided which comprises a polymer blend of a polyolefin resin, a halogenated elastomeric copolymer, such as a halogenated butyl rubber, or a halogenated copolymer of a C.sub.4 to C.sub.7 isomonoolefin and a para-alkylstyrene, and a halogenated polyethylene. The composition has improved flame retarding properties. Additional flame retarding additives may be incorporated in the composition. The dynamically vulcanized thermoplastic composition is suitable for use in roofing sheets.
Claims43
A thermoplastic composition comprising a dynamically vulcanized polymer blend of (I) a polyolefin resin, (II) a halogenated elastomeric copolymer selected from the group consisting of 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, and mixtures thereof, and (III) a halogenated polyethylene.
A process for preparing a vulcanized thermoplastic composition, which comprises the steps of:
- (a) blending (I) a polyolefin resin, (II) an unvulcanized halogenated elastomeric copolymer selected from the group consisting of 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, and mixtures thereof, (III) an unvulcanized halogenated polyethylene, and a vulcanization agent capable of vulcanizing at least said halogenated elastomeric copolymer;
- and
- (b) masticating and shearing the blend resulting from step (a) at vulcanization conditions for a time sufficient to produce a vulcanized thermoplastic composition.
Dependencies are inferred from the claim text.