Chisso Corporation

Kunio Gouda

Hirohisa Ishii

Masami Kimura

Takanori Nakashima

Kazuhiro Kimura

Chikashi Okayama

Yasuhiro Mochizuki

Noriaki Saito

Junichiro Yokota

Toshiki Yamamoto

Toshihiko Nishida

Masataka Sugimoto

Yasuhiko Nakagawa

Shouji Kawano

Mayumi Wakata

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

The present invention provides blow bottles of a polyolefin resin having excellent transparency by the utilization of characteristics of the polypropylene. That is, they are the blow bottles of a polyolefin resin obtained by subjecting, to an extrusion blow molding method, a composition having a melt flow rate at 230.degree. C. of 0.5 to 10 g/10 minutes prepared by blending (A) 70 to 99.99% by weight of a propylene random copolymer of multi-component system having a crystalline melting point of 110.degree. to 145.degree. C. and containing 3 to 10% by weight of ethylene units with (B) a certain amount of two or three kinds of polyethylenes selected from 15 to 0.01% by weight of a straight-chain low-density polyethylene, 4 to 0.01% by weight of a low-density polyethylene and 4 to 0.01% by weight of a high-density polyethylene.

Blow bottles of polyolefin resin

Growing community of inventors

Ichihara, Japan

Kunio Gouda