C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/3036
C08L 53/00 (2006.01) C08L 23/10 (2006.01) C08L 53/02 (2006.01)
Patent
CA 1327662
ABSTRACT THERMOPLASTIC ELASTOMER COMPOSITION AND PROCESS FOR PRODUCING SAME A thermoplastic elastomer composition superior in moldability and appearance, little in anisotropy of mechanical properties, especially, tensile strength and retaining low temperature impact strength, is obtained by previously melt-kneading an intermediate composition comprising (a) 100 parts by weight of a selectively hydrogenated block copolymer which has at least two mono-alkenyl or mono- alkenylidene aromatic hydrocarbon polymer blocks A having a number-average molecular weight of 25,000 - 35,000 and at least one partially or completely hydrogenated aliphatic conjugated diene hydrocarbon polymer block B having a number-average molecular weight of 100,000 - 150,000, (b) 50 - 150 parts by weight of an extender oil and (c) 0 - 50 parts by weight of polypropylene I, then adding, to the kneaded intermediate composition, (d) polypropylene II contain- ing at least 35 % by weight of a propylene-ethylene block copolymer having a melt flow rate of 10 - 30 g/10 min. and an ethylene content of 3 - 15 % by weight in such amount that total amount of polypropylene I plus polypropylene II is 200 - 400 parts by weight per 100 parts by weight of block copolymer (a) and then further melt kneading the mixture. Further addition of a filler to the composition can afford a thermoplastic elastomer composition of small linear expansion coefficient with retaining the above properties.
586363
Mitsuno Tatsuyuki
Shinonaga Hideo
Yamamoto Masashi
Bull Housser & Tupper Llp
Sumitomo Chemical Co. Ltd.
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