Sumitomo Chemical Company, Limited

Hiroyuki Shiraishi

Toshio Sasaki

Kiyoshi Kawai

Hirofumi Johoji

Yoshihiro Miyoshi

Yuji Shigematsu

Takeshi Ebara

Tadahiro Mitsuno

Kohzoh Miyazaki

Yufu Sato

Akio Imai

Kazuki Wakamatsu

Seiichiro Ima

Hideki Sato

Hiroaki Katayama

Takahiro Hino

Toshiyuki Kokubo

Eiji Nakaishi

Yuji Kanda

Toshimi Sato

Hideaki Koga

Akio Uemura

Ethylene-&agr;-olefin copolymer and polyethylene composition

Polyolefin resin composition and film comprising the same

Olefin polymer, films or sheets made therefrom, and process for the production of olefin polymer

A solid catalyst component (A) for olefin polymerization comprising Mg, Ti, a halogen and a cyclic organic nitrogen compound (C), a solid catalyst comprising the solid catalyst component and an organoaluminum compound, and a process for producing an olefin polymer with the catalyst. According to the present invention, there can be provided an olefin polymerization catalyst having a high catalyst activity per titanium enough to make the removal of catalyst residues unnecessary and a process for producing an olefin polymer having a low content of low molecular weight component with the catalyst.

Method for preparing catalyst component for olefin polymerization,

A novel ethylene-.alpha.-olefin copolymer and a molded article formed therefrom, wherein (A) a density is 0.870 to 0.945 g/cm.sup.3, (B) a relation between an activation energy of flow Ea (J/mole K) obtained by measurement of viscoelasticity at at least three temperatures in the molten state and a melt flow rate MFR (g/10 min) satisfies the following equation (1):

Ethylene-.alpha.-olefin copolymer and molded article thereof

An ethylene-.alpha.-olefin copolymer having;

Ethylene-.alpha.-olefin copolymer and a molded article therefor

A process for polymerizing ethylene at a high temperature under high pressure, which comprises contacting ethylene alone or along with an .alpha.-olefin at a temperature of 120.degree. C. or more at a pressure of 350 kg/cm.sup.2 or more with a catalyst consisting essentially of (A) a reaction product of (A1) a titanium compound having at least one titanium-nitrogen bond with (A2) an organometallic compound of an element of Groups I to III of the Periodic Table and (B) an organoaluminum compound. Said process enables the production of an ethylene polymer or copolymer having a narrow composition distribution and a high molecular weight and being excellent in weather resistance, color development, transparency, corrosiveness and mechanical properties.

Process for polymerizing ethylene at high temperature under high pressure

A process for producing an olefin polymer which Comprises homopolymerizing or copolymerizing an olefin in a gas phase by using a catalyst system comprising the following components A) and B):

Process for producing olefin polymers

A liquid catalyst component which can be used as a component of a catalyst system in combination with an organoaluminum compound (B) for producing ethylene-.alpha.-olefin copolymers.

Liquid catalyst component, catalyst system containing the same, and

A process for producing an ethylene-.alpha.-olefin copolymer which comprises copolymerizing ethylene and an .alpha.-olefin at a temperature higher than 120.degree. C. by using a catalyst system comprising a specified titanium amide compound represented by general formula (R.sup.1 R.sup.2 N).sub.4-n TiY.sub.n and an oxygen-containing alkylaluminum compound. According to the above process, there can be obtained ethylene-.alpha.-olefin copolymers narrow in composition distribution, high in molecular weight and excellent in weather resistance, colorizability, corrosion resistance and dynamic properties.

Process for producing ethylene-.alpha.-olefin copolymers

An olefin polymerization catalyst comprising:

Olefin polymerization catalyst and process for producing ethylene

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Ichihara, Japan

Hiroyuki Shiraishi