C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/3042
C08L 53/00 (2006.01) C08L 23/02 (2006.01) C08L 23/16 (2006.01) C08L 53/02 (2006.01)
Patent
CA 2039992
ABSTRACT THERMOPLASTIC ELASTOMER COMPOSITION Disclosed is a thermoplastic elastomer composition which has a Shore A hardness of less than 45 and which comprises: (a) 100 parts by weight of a selectively hydrogenated block copolymer which has a structure having at least two terminal polymer blocks A comprising an aromatic monoalkenyl or monoalkenylidene hydrocarbon polymer of 5,000-125,000 in number average molecular weight and at least one intermediate polymer block B comprising a partially or completely hydrogenated aliphatic conjugated diene hydrocarbon polymer of 10,000-800,000 in number average molecular weight, (b) 50-400 parts by weight of an oil-extended olefinic copolymer rubber comprising 100 parts by weight of an olefinic copolymer rubber having a 100°C Mooney viscosity (ML1+4 100°C) of 150-350 and 20-150 parts by weight of a mineral oil type softening agent, (c) 2-100 parts by weight of a polyolefin resin, and (d) 50-350 parts by weight of a mineral oil type softening agent, said composition being prepared by heat treating a mixture comprising at least a total amount of the component (b) and a part or a total amount of the component (c) among the components (b)-(c) in the presence of an organic peroxide to partially crosslink the mixture and then, blending the resulting partially crosslinked product with the component (a) and the remainder components. The thermoplastic elastomer composition may additionally contain at least one of (e) 0.03-2 parts by weight of an antistatic agent for polyolefin and (f) 0.003-2 parts by weight of a higher fatty acid amide per 100 parts by weight of the composition.
Hamanaka Tatsuo
Hikasa Tadashi
Ibuki Koichiro
Bull Housser & Tupper Llp
Sumitomo Chemical Co. Ltd.
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