Process for polymerizing 1-olefins with a chromium catalyst and

Details Process for polymerizing 1-olefins with a chromium catalyst and Process for polymerizing 1-olefins with a chromium catalyst and

1979-08-15

1981-02-24

Levin, Stanford M.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526352, 526105, C08F 424

Patent

active

042529280

ABSTRACT:
Process for polymerizing ethylene, or mixtures thereof with up to 40 wt % of other 1-olefinic monomer comprising contacting the monomer under particle form polymerization conditions at a temperature not greater than 112.degree. C. with a catalyst prepared by heat activating chromium oxide or a compound calcinable thereto, on a refractory oxide support material and a catalyst modifier comprising an aliphatic diene and a trihydrocarbyl boron. The refractory oxide support material can be, for example silica and the heat activation is preferably carried at 400.degree. to 900.degree. C. The aliphatic diene preferably contains 1 to 10 carbon atoms and can be, for example butadiene, isoprene, 1,5-hexadiene, 1,7-octadiene or ethylidene norbornene. The trihydrocarbyl boron, for example trimethyl, triethyl or triisobutyl boron. The quantity of diene is preferably 10 to 5000 moles per gram atom of chromium and the quantity or trihydrocarbyl boron is preferably 0.1 to 20 moles per gram atom of chromium.

REFERENCES:
patent: 2898326 (1959-08-01), Peters et al.
patent: 3351623 (1967-11-01), Walker et al.
patent: 3484428 (1969-12-01), Kallenbach

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