Process and catalyst for producing crystalline polyolefins

Details Process and catalyst for producing crystalline polyolefins Process and catalyst for producing crystalline polyolefins

1992-08-05

1994-04-19

Garvin, Patrick P.

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Organic compound containing

502103, 502117, 526170, 556 11, 556 43, 556 53, 556 58, C08F 464, C08F 468, C08F 400

Patent

active

053045238

ABSTRACT:
Catalyst and process for the stereospecific propagation of a polymer chain derived from an ethylenically unsaturated monomer which contains 3 or more carbon atoms or is substituted vinyl compound. The catalysts comprise stereorigid metallocenes in which a structural bridge is not required for stereorigidity. The ring structures of the metallocene catalyst are substituted cyclopentadienyl rings. The substituent groups on the cyclopentadienyl rings impart stereorigidity to the catalyst by virtue of a sterically hindered relationship between the rings sufficient to prevent rotation of the rings. The catalyst is contacted with a C.sub.3 + alpha olefin or other ethylenically unsaturated compound in a polymerization reaction zone and maintained in contact with the catalyst in the reaction zone under polymerization conditions to produce a sterospecific polymer.

REFERENCES:
patent: 4658078 (1987-04-01), Slaugh et al.
patent: 5162278 (1992-11-01), Razavi

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