Ethylene polymerization catalyst and method

Details Ethylene polymerization catalyst and method Ethylene polymerization catalyst and method

C - Chemistry, Metallurgy

08

F

252/100, 402/631

C08F 4/02 (2006.01) B01J 21/02 (2006.01) B01J 23/36 (2006.01) B01J 31/14 (2006.01) C08F 10/00 (2006.01)

Patent

CA 1090765

Abstract of the Disclosure A highly active catalyst for polymerizing ethylene to polyethylene having a narrow molecular weight distribution, a method of making the catalyst and a method of polymerizing ethyl- one to such a polyethylene in which the catalyst is prepared by forming a mixture of a porous support of silica, alumina, zirconia, thoria or mixtures and a chromium compound and an alkyl ester of boron containing 1-7 carbon atoms in the alkyl group or a halide of boron capable of reacting with the chromium compound and acti- vating this mixture at an elevated temperature in a fluidized bed with a substantially dry reducing gas followed by fluidizing with an oxidizing gas at an elevated temperature.

289822

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