Olefin polymerization process using pretreated catalyst

Details Olefin polymerization process using pretreated catalyst Olefin polymerization process using pretreated catalyst

1979-06-13

1981-06-30

Smith, Edward J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

252429B, 525247, 526 65, 526351, 526904, C08F 466, C08F 1006

Patent

active

042764009

ABSTRACT:
Process for polymerizing alpha-olefins employing a pretreated catalyst comprising an organopolylithiumaluminum compound prepared by reacting lithium compounds selected from the group consisting of lithium hydride and lithium alkyl with at least one aluminum compound selected from the group consisting of aluminum trialkyl and dialkyl aluminum hydride, an alkyl compound selected from the group consisting of lithium alkyl, aluminum trialkyl and dialkyl aluminum hydride and the alpha form of TiCl.sub.3. This catalyst is pretreated by initially polymerizing alpha-olefins with the catalyst under slurry polymerization conditions to form a small amount of prepolymer. The catalyst and small amount of prepolymer is then used to polymerize alpha-olefins subsequently under solution conditions in solution commercial polymerization processes operated at temperatures above 140.degree. C. over extended periods of time. This pretreatment increases the activity of the catalyst, as well as the amount of crystalline polymer obtained.

REFERENCES:
patent: 3067183 (1962-12-01), Hagemeyer et al.
patent: 3679775 (1972-07-01), Hagemeyer et al.
patent: 3893989 (1975-07-01), Leicht et al.

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