Chisso Corporation

Hirohisa Ishii

Toshihiko Nishida

Kazuhiro Kimura

Junichiro Yokota

Toshiki Yamamoto

Masataka Sugimoto

Yasuhiko Nakagawa

Shouji Kawano

Kunio Gouda

Kunio Gohda

Jun Saito

Masami Kimura

Akira Yamauchi

Takanori Nakashima

Masahiko Taniguchi

Yoshitaka Morimoto

Tadashi Tanaka

Chikashi Okayama

Yasuhiro Shiraishi

Shingo Kikukawa

Hiroyuki Maehara

Yasuhiro Mochizuki

Noriaki Saito

Tooru Fukazawa

Hitoshi Sato

Hideo Nobuhara

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

A process for producing a hollow or sheet molded product having a superior appearance is provided, which process is characterized in that a multi-layer molded product having a surface layer (A) of a propylene random polymer of m.p. of 100.degree. to 150.degree. C. having a thickness of 1 to 20% of that of the molded product, and a substrate layer (B) of a thermoplastic resin of a m.p. higher than that of the propylene random polymer is formed and the surface layer (A) is heat-treated into a molten state, followed by immediately cooling to form a smooth surface.

Process for producing molded product

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

Process for producing molding product

Growing community of inventors

Chiba, Japan

Hirohisa Ishii