Thermoplastic elastomer composition
AssigneeMitsui Petrochemical Industries, Ltd.
InventorsKatsuyoshi Yonekura, Akira Uchiyama, Akira Matsuda
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Abstract
A thermoplastic elastomer composition composed of a partially crosslinked product of a blend consisting mainly of (a) 80 to 10 parts by weight of a peroxide-crosslinkable olefinic copolymer rubber, (b) 10 to 80 parts by weight of a peroxide-crosslinkable polyolefin resin having specific properties and (c) 50 to 10 parts by weight of a peroxide-decomposable polyolefin resin, the total amount of (a)+(b)+(c) being 100 parts by weight, the crosslinked product is obtained by dynamically heat-treating said blend in the presence of (d) an organic peroxide. The thermoplastic elastomer has excellent film formability, and is useful as a waterproof sheet.
Claims12
A thermoplastic elastomer composed of a partially crosslinked product of a blend consisting essentially of
- (a) 60 to 30 parts by weight of a peroxide-crosslinkable olefin copolymer rubber,
- (b) 20 to 40 parts by weight of a peroxide-crosslinkable polyolefin resin, and
- (c) 40 to 20 parts by weight of a peroxide-decomposable polyolefin resin,
- the total amount of (a)+(b)+(c) being 100 parts weight, said crosslinked product being obtained by dynamically heat-treating said blend in the presence of (d) an organic peroxide, and said peroxide-crosslinkable polyolein resin (b) being a linear low density polyethylene composed of a random copolymer of ethylene and an alpha-olefin having 4 to 10 carbon atoms, said linear low density polyethylene having an ethylene content of from 90 to 99.5 mole %, a melt index of from 0.1 to 50 g/10 min., a density of from 0.910 to 0.940 g/cm.sup.3 and a melting point of from 115.degree. to 130.degree. C.
Dependencies are inferred from the claim text.