Sumitomo Chemical Company, Limited

Toshimi Sato

Toshio Sasaki

Kizuku Wakatsuki

Tadashi Hikasa

Hirofumi Johoji

Hiroyuki Shiraishi

Kazuo Baba

Yuji Shigematsu

Kohzoh Miyazaki

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 a polyolefin, which comprises polymerizing an olefin in the presence of a catalyst system comprising:

Process for producing polyolefin

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Kisarazu, Japan

Toshimi Sato