Polymerization process

Details Polymerization process Polymerization process

1979-03-19

1980-03-18

Levin, Stanford M.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

252428, 252430, 252432, 252433, 526 98, C08F 424

Patent

active

041940741

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.

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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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