Patent ID: 6790911
Filing Date: 2004-09-14
Classification: C08F,C08L

Abstract:
A thermoplastic vulcanizate comprising:a vulcanized rubber selected from one or more of the group consisting of elastomeric copolymer rubber, butyl rubber, natural rubber, styrene-butadiene copolymer rubber, butadiene rubber, acrylonitrile rubber, halogenated rubber such as brominated and chlorinated butyl rubber, butadiene-styrene-vinyl pyridine rubber, urethane rubber, polyisoprene rubber, epichlolorohydrin terpolymer rubber, and polychloroprene rubber; a thermoplastic resin selected from one or more of the group consisting of crystallizable polyolefins having a Tm from about 150 to 175Â° C., polyimides, polyesters (nylons), poly(phenylene ether), polycarbonates, styrene-acrylonitrile copolymers, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polystyrene derivatives, polyphenylene oxide, polyoxymethylene, and fluorine-containing thermoplastics; a polyethylene resin having a crystallinity in excess of 25% as measured by differential scanning calorimetry and an MFI (ASTM D-1238) greater than about 5 dg/min; a flexible block copolymer having at least two hard blocks or segments with at least one soft block or segment between the hard blocks wherein the soft block(s) is derived from conjugated diene monomers and vinyl aromatic monomers and the hard blocks are derived from vinyl aromatic monomers; a hydrocarbon resin tackifier; and, wherein said vulcanized rubber has been cured with a curative system selected from the group consisting of phenolic resins, silicon-containing curatives, zinc oxides, diamines, dithio carbamate-based cure systems, and bismaleimide-based cure systems, and is dispersed as fine particles within said thermoplastic vulcanizate.