Thermoplastic elastomer composition

Claim 1

A thermoplastic elastomer composition obtained by dynamically, heat-treating a mixture of (a) 100 parts by weight of a carbon-to-carbon double bond-containing rubber, (b) 5 to 300 parts by weight of a thermoplastic resin, (c) 0.5 to 30 parts by weight of an organo-siloxane crosslinking agent having at least two SiH groups in the molecule, (d) 0.001 to 20 parts by weight of a hydrosilylating catalyst and (e) 0.5 to 20 parts by weight of a compatibilizing agent, wherein (1) the carbon-to-carbon double bond-containing rubber (a) is at least one member selected from the group consisting of ethvlene-α-olefin-non-conjugated diene copolymer rubber, vinyl aromatic compound-conjugated diene compound copolymer rubber, butadiene rubber and butyl rubber; the thermoplastic resin (b) is at least one member selected from the group consisting of polyolefin resin, polyester resin, polyamide resin and polycarbonate resin; and the compatibilizing agent (e) is at least one member selected from the following epoxy-modified compatibilizing agents (e-3), (e-4) and (e-5): (e-3): an epoxy-modified hydrogenated block copolymer obtained by hydrogenating a copolymer comprising at least two terminal blocks each consisting mainly of a vinyl aromatic compound and at least one intermediate polymer block consisting mainly of a conjugated diene compound, (e-4) : an epoxy-modified ethylene-α-olefin(-non-conjugated dienes) copolymer rubber, and (e-5): an epoxy-modified polyolefin resin, or (2) the carbon-to-carbon double bond-containing rubber (a) is at least one member selected from the group consisting of ethylene-α-olefin-non-conjugated diene copolymer rubber, vinyl aromatic compound-conjugated diene compound copolymer rubber, butadiene rubber and butyl rubber; the thermoplastic resin (b) is at least one member selected from the group consisting of polyolefin resin and polyamide resin; and the compatibilizing agent (e) is at least one member selected from the following maleic anhydride-modified compatibilizing agents (e-6), (e-7) and (e-8): (e-6): a maleic anhydride-modified hydrogenated block copolymer obtained by hydrogenating a copolymer comprising at least two terminal blocks each consisting mainly of a vinyl aromatic compound and at least one intermediate block consisting mainly of a conjugated diene compound, (e-7) : a maleic anhydride-modified ethylene-α-olefin(-non-conjugated diene) copolymer rubber, and (e-8): a maleic anhydride-modified polyolefin resin, or (3) the carbon-to-carbon double bond-containing rubber (a) is at least one member selected from the group consisting of ethylene-α-olefin-non-conjugated diene copolymer rubber, vinyl aromatic compound-conjugated diene compound copolymer rubber, butadiene rubber, butyl rubber, α,β-unsaturated nitrile-conjugated diene copolymer rubber and acrylic rubber; the thermoplastic resin (b) is at least one member selected from the group consisting of polyolefin resin, polyester resin, polyamide resin, polycarbonate resin, vinyl chloride resin and methacrylate resin; and the compatibilizing agent (e) is (e-9) a modified polyolefin resin having epoxy group and ester group in the same molecule, or (4) the carbon-to-carbon double bond-containing rubber (a) is at least one member selected from the group consisting of acrylic rubber and α,β-unsaturated nitrile-conjugated diene copolymer rubber; the thermoplastic resin (b) is at least one member selected from the group consisting of vinyl chloride resin, polyurethane resin and methacrylate resin; and the compatibilizing agent (e) is (e-10) at least one member selected from the group consisting of halogenated olefin resin, vinyl chloride-vinyl acetate copolymer and vinyl aromatic compound-α,β-unsaturated nitrile-conjugated diene copolymer, or (5) the carbon-to-carbon double bond-containing rubber (a) is an ethylene-α-olefin-non-conjugate diene copolymer rubber; the thermoplastic resin (b) is a crystalline olefin resin; and the compatibilizing agent (e) is at least one member selected from the following compatibilizing agents (e-11), (e-12) and (e-13): (e-11) : a compatibilizing agent prepared by melt-reacting a polypropylene resin having epoxy group as an essential component with at least one member selected from the group consisting of maleic anhydride-modified resins such as polyethylene having maleic anhydride group in the molecule, ethylene copolymer having maleic anhydride group in the molecule, styrene block copolymer having maleic anhydride group in the molecule, its hydrogenated product, styrene random copolymer having maleic anhydride group in the molecule and its hydrogenated product, (e-12): a compatibilizing agent prepared by melt-reacting a polypropylene having maleic anhydride group in the molecule as an essential component it at least one epoxy-modified resin selected from polyethylene having epoxy group in the molecule, ethylene copolymer having epoxy group in the molecule, stryrene block copolymer having epoxy group in the molecule, its hydrogenated product, styrene random copolymer having epoxy group in the molecule and its hydrogenated product, and (e-13) : a compabilizing agent prepared by dynamically heat-treating, in the presence of a peroxide, a blend of a polypropylene as an essential component with at least one resin selected from the group consisting of polyethylene, ethylene copolymer, styrene block copolymer, its hydrogenated product, styrene random copolymer and its hydrogenated product.