Process for polymerising ethylene using a chromium oxide catalys

Details Process for polymerising ethylene using a chromium oxide catalys Process for polymerising ethylene using a chromium oxide catalys

1987-12-24

1989-11-07

Smith, Edward J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

502117, 526352, 526904, 526901, C08F 234, C08F 422

Patent

active

048793590

ABSTRACT:
Process for polymerising ethylene, or copolymerising ethylene with an alpha-olefin, in the gas phase in the presence of a prepolymer/catalyst composition, the catalyst being an activated chromium oxide supported on a refractory oxide. The prepolymer is treated to an extraction with a solution comprising inert hydrocarbon and an organometallic compound, for example an alkylaluminum, prior to being dried and introduced into the gas phase (co) polymerisation. Prepolymer thus treated has improved properties in the dry state, for example improved flow.

REFERENCES:
patent: 3277070 (1966-10-01), Van Weynbergh et al.
patent: 3878179 (1975-04-01), Hogan

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