Asahi Kasei Kogyo Kabushiki Kaisha

Kisoo Moriguchi

Hisaya Sakurai

Tadashi Ikegami

Yoshihiko Katayama

Isaburo Fukawa

Naoji Yoshii

Shigeru Mizutani

A polyethylene composition comprising three specific types of polyethylenes; polyethylene (A), polyethylene (B) and polyethylene (C) respectively. The polyethylene composition has a melt index not less than 0.001 g/10 min. and not more than 10 g/cm and exhibits excellent processability under variant molding techniques. Molded objects exhibit excellent physical properties such as impact strength environmental stress cracking resistance and uniform thickness distribution. Polyethylene (A) has a molecular weight of from 5,000 to 90,000 and polyethylene (C) has a molecular weight of from 100,000 to 1,500,000 and the ratio of the molecular weight of polyethylene (C)/the molecular weight of polyethylene (A) is from 4 to 200. Polyethylene (B) has a molecular weight of from 50,000 to 500,000, being prepared by a polymerization with use of a chromium compound-supported type catalyst capable of producing a specifically conditioned homopolyethylene with respect to the properties of the polymers in terms of flow ratio and die swell.

Polyethylene composition

A modified linear medium- or low-density polyethylene composition obtained by uniformly melt kneading a mixture of a linear medium- or low-density polyethylene having a density of not less than 0.90 g/cm.sup.3 but less than 0.94 g/cm.sup.3 and a melt index (MI).sub.1 of not more than 3 g/10 minutes and a radical initiator in an amount of not less than 0.0005% by weight but less than 0.1% by weight based on the weight of the linear medium- or low-density polyethylene at a temperature of from the melting point of the linear medium- or low-density polyethylene to a temperature of less than the thermal decomposition temperature of the linear medium- or low-density polyethylene to such an extent that the ratio of the melt index of the modified linear medium- or low-density polyethylene composition (MI).sub.2 to that of the linear medium- or low-density polyethylene (MI).sub.1 [(MI).sub.2 /(MI).sub.1 ] is 0.05 to 0.9.

Linear medium- or low-density polyethylene composition

A crosslinked polyethylene composition having excellent physical properties (e.g., a high stiffness, a high ESCR, and a high impact strength) and improved molding properties (e.g., an improved melt tension and an improved dye swell) is disclosed. This composition is obtained by lightly crosslinking and intimately melt blending a composition comprising high- and medium-density polyethylene (A) having a high molecular weight and high- and medium-density polyethylene B having a low molecular weight, wherein

Polyethylene blend composition

An intimately melted and homogenized polyethylene composition having excellent physical properties and moldability and comprising a high-medium density polyethylene having a high molecular weight (A), a high-medium density polyethylene having a low molecular weight (B) and a low density polyethylene (C) characterized in that:

An ethylene polymer film exhibiting improved impact strength and tear strength is provided. This film is made of an inorganic filler-incorporated ethylene polymer composition which is comprised of:

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Kurashiki, Japan

Kisoo Moriguchi