Ethylene polymerization catalyst and method

Details Ethylene polymerization catalyst and method Ethylene polymerization catalyst and method

1978-06-12

1979-11-06

Konopka, P. E.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252428, 252432, 252433, 526 96, 526131, C08F 402, B01J 3114, B01J 2102, B01J 2336

Patent

active

041735480

ABSTRACT:
A highly active catalyst for polymerizing ethylene to polyethylene and copolymers of ethylene with alpha-olefins having a narrow molecular weight distribution, a method of making the catalyst and a method of polymerizing 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 activating 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.

REFERENCES:
patent: 2810774 (1957-10-01), Serniuk
patent: 3294860 (1966-12-01), Loft et al.
patent: 3515705 (1970-01-01), Balitrand
patent: 3694422 (1972-09-01), Long
patent: 3780011 (1973-12-01), Pullukat et al.
patent: 3884832 (1975-05-01), Pullukat et al.
patent: 3953413 (1976-04-01), Hwang et al.
patent: 4003978 (1977-01-01), Shiroishi et al.

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