Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1999-02-17
2000-09-19
Buttner, David J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
525 89, C08K 322, C08L 5300, C08L 5302, C08L 2310
Patent
active
061213632
ABSTRACT:
A crystalline propyleiie 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 relatively smaller stylene content; 2 to 12% by weight of a second hydrogenated product of a block-copolymer having a relatively greater stylene 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 said (Fc) has an intrinsic viscosity of 7 dl/g or higher.
REFERENCES:
patent: 5045589 (1991-09-01), Ueno
patent: 5543454 (1996-08-01), Kamakura et al.
Hashimoto Mikio
Iwai Hisayuki
Kito Osamu
Matsuda Masatoshi
Nagai Takayuki
Buttner David J.
Grand Polymer Co. Ltd.
Toyota Jidosha & Kabushiki Kaisha
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