C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 53/00 (2006.01) C08L 23/12 (2006.01) C08L 47/00 (2006.01)
Patent
CA 2051322
An olefin thermoplastic elastomer composition prepared by subjecting a composition comprising (a) 100 parts by weight of an ethylene - .alpha.-olefin - non- conjugated diene copolymer rubber having a high molecular weight, the Mooney viscosity (ML 1+4, at 125°C) of a composition consisting of 100 parts by weight of the copolymer rubber and 75 parts by weight of a mineral oil- type softening agent being 40 or more, (b) from 10 to 500 parts by weight of a crystalline ethylene-propylene block copolymer resin having a melt flow rate of 10 to 50, (c) from 3 to 300 parts by weight of a mineral oil-type softening agent, and (d) from 5 to 100 parts by weight of a low-molecular-weight propylene homopolymer resin having a number-average molecular weight of 2000 to 20000, the weight ratio of the low-molecular-weight propylene homopolymer resin to the crystalline ethylene-propylene block copolymer resin being 0.8 or less, to dynamic vulcanization using, as a vulcanizing agent, from 0.5 to 15 parts by weight of a reactive alkylphenol-formaldehyde resin to vulcanize the ethylene - .alpha.-olefin - non- conjugated diene copolymer rubber to a high degree. The elastomer composition is excellent in injection moldability, and a molding prepared therefrom has a good appearance, excellent mechanical properties, high shape recoverability, high oil resistance, and low anisotropy in mechanical properties. The elastomer composition is therefore favorably usable for parts of automobiles and the like.
Advanced Elastomer Systems L.p.
Fetherstonhaugh & Co.
Monsanto Japan Limited
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