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AssigneeSumitomo Chemical Company, Limited
InventorsToshio Sasaki, Hirofumi Johoji, Hiroyuki Shiraishi, Kohzoh Miyazaki, Toshimi Sato, Yuji Shigematsu
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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.
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 previously mutually contacted product of (A1) a titanium compound having at least one titanium-nitrogen bond with (A2) an organomagnesium compound and (B) an organoaluminum compound represented by the general formula R.sup.3.sub.a AlZ.sup.1.sub.3-a wherein R.sup.3 represents a hydrocarbon group having 1 to 20 carbon atoms:
Dependencies are inferred from the claim text.