发明授权
- 专利标题: Thermoplastic elastomer composition and process for producing same
- 专利标题(中): 热塑性弹性体组合物及其制备方法
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申请号: US742499申请日: 1991-08-05
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公开(公告)号: US5260366A公开(公告)日: 1993-11-09
- 发明人: Tatsuyuki Mitsuno , Hideo Shinonaga , Masashi Yamamoto
- 申请人: Tatsuyuki Mitsuno , Hideo Shinonaga , Masashi Yamamoto
- 申请人地址: JPX Osaka
- 专利权人: Sumitomo Chemical Company, Limited
- 当前专利权人: Sumitomo Chemical Company, Limited
- 当前专利权人地址: JPX Osaka
- 优先权: JPX62-328855 19871224
- 主分类号: C08L23/10
- IPC分类号: C08L23/10 ; C08L53/02 ; C08K3/26
摘要:
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 containing 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.