Chisso Corporation

Masataka Sugimoto

Kazuhiro Kimura

Hirohisa Ishii

Junichiro Yokota

Toshiki Yamamoto

Yasuhiko Nakagawa

Shouji Kawano

Jun Saito

Masami Kimura

Akira Yamauchi

Takanori Nakashima

Masahiko Taniguchi

Yoshitaka Morimoto

Tadashi Tanaka

Chikashi Okayama

Yasuhiro Shiraishi

Shingo Kikukawa

Hiroyuki Maehara

Noriaki Saito

Yasuhiro Mochizuki

Hitoshi Sato

Tooru Fukazawa

Hideo Nobuhara

Kunio Gouda

Yoichi Kugimiya

Yuichi Yamanaka

Hiroaki Ito

Mayumi Wakata

A plastic molded product of olefin (co)polymer composition comprises 0.01-5.0 weight parts high molecular weight polyethylene with an intrinsic viscosity &eegr; in the range of 15-100 dl/g measured in 135&deg; C. tetralin and preferably 100 weight parts polypropylene. The high molecular weight polyethylene has an average particle size in the range of 1-5000 nm and is finely dispersed as fine granules in the polypropylene, so that high melt strength and high crystallization temperature are attained, enabling various molding methods to be performed with high speed productivity. Using the polymer composition, plastics such as a resin foam, a film, a sheet, a layered plastic article with a coated substrate surface, a hollow plastic article, an injection molded plastic article, a fiber, a nonwoven web or a continuous tube-shaped plastic are provided. The olefin (co)polymer composition is obtained by preparing high molecular weight polyethylene granules using e.g. a titanium transition metal compound catalyst, and adding these, e.g. as a polymerization catalyst of propylene, singly or together with a polyolefin preparing catalyst.

Molded resin articles

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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Chiba, Japan

Masataka Sugimoto