Chisso Corporation

Mayumi Wakata

Masami Kimura

Takanori Nakashima

Kazuhiro Kimura

Chikashi Okayama

Yasuhiro Mochizuki

Hirohisa Ishii

Noriaki Saito

Junichiro Yokota

Toshiki Yamamoto

Masataka Sugimoto

Yasuhiko Nakagawa

Shouji Kawano

Kunio Gouda

A polypropylene composition for the production of various molded articles which are excellent in moldability, mold shrinkage factor on molding, rigidity, flexibility, impact resistance, in particular low-temperature impact resistance, transparency, gloss, stress-whitening resistance, and the balance thereof; various molded articles having the above properties; a propylene composition which is suitable for a base resin for the polypropylene composition; and a process for the production thereof. The propylene composition comprises a propylene homopolymer and a propylene-ethylene copolymer, the intrinsic viscosity of the copolymer (&lsqb;&eegr;&rsqb;,) is in the range of 1.7 to 2.8 dl/g, the intrinsic viscosity ratio of the homopolymer to the copolymer (&lsqb;&eegr;&rsqb;,/&lsqb;&eegr;&rsqb;,) is in the range of 0.7 to 1.2 and a product &lsqb;(W,/W,)&times;(&lsqb;&eegr;&rsqb;,/&lsqb;&eegr;&rsqb;,)&rsqb; of the weight ratio (W,/W,) of the homopolymer to the copolymer and the intrinsic viscosity ratio thereof is in the range of 1.0 to 3.0.

Propylene composition, process for preparing the same, polypropylene composition, and molded articles

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Ichihara, Japan

Mayumi Wakata