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    • 3. 发明公开
    • Crystalline propylene block-copolymer composition for use in automobile parts
    • Kristalline BlockcopolymerzusammensetzungenfürKraftfahrzeugteile
    • EP0936248A1
    • 1999-08-18
    • EP99301024.8
    • 1999-02-12
    • Grand Polymer Co., Ltd.TOYOTA JIDOSHA KABUSHIKI KAISHA
    • Sakai, IkunoriHashimoto, MikioNagai, TakayukiNomura, TakaoMatsuda, MasatoshiKito, OsamuIwai, Hisayuki
    • C08L53/00
    • C08L53/00C08L2666/24
    • A crystalline propylene block-copolymer composition exhibiting superior flowability upon molding for use in automobile parts, which composition comprises 41 to 71% by weight of a crystalline propylene block-copolymer composed of a propylene homopolymer portion (Fp) and an ethylene/propylene random copolymer portion (Fc) and having an ethylene content of 1 to 10% by weight and a melt flow rate (MFR) of 20 to 100 g/10 min.; 12 to 22% by weight of a first hydrogenated product of a block-copolymer having a lower styrene content; 2 to 12% by weight of a second hydrogenated product of a block-copolymer having a higher styrene content; and 15 to 25% by weight of talc, wherein the propylene homopolymer portion (Fp) contains 20 to 50% by weight of a low molecular weight propylene homopolymer having an MFR of 400 to 1,000 g/10 min., the average MFR being 100 to 350 g/10 min. and the isotactic pentad fraction being at least 98%, and wherein the random copolymer portion (Fc) has an intrinsic viscosity of 7 dl/g or higher.
    • 一种结晶丙烯嵌段共聚物组合物,其成型用于汽车部件时具有优异的流动性,该组合物包含41至71重量%的由丙烯均聚物部分(Fp)和乙烯/丙烯无规共聚物组成的结晶丙烯嵌段共聚物 部分(Fc),乙烯含量为1〜10重量%,熔体流动速率(MFR)为20〜100g / 10分钟。 12至22重量%的具有较低苯乙烯含量的嵌段共聚物的第一氢化产物; 2至12重量%的具有较高苯乙烯含量的嵌段共聚物的第二加氢产物; 和15〜25重量%的滑石,其中丙烯均聚物部分(Fp)含有20〜50重量%的MFR为400〜1000g / 10分钟的低分子量丙烯均聚物,平均MFR为100 至350g / 10min。 所述全同立构五单元组比例为98%以上,所述无规共聚物部分(Fc)的特性粘度为7dl / g以上。