Catalyst yield from supported metallocene catalysts

Details Catalyst yield from supported metallocene catalysts Catalyst yield from supported metallocene catalysts

1996-12-20

1998-12-08

Wu, David W.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526114, 526119, 526160, 526943, 526153, 526351, 502113, 502152, C08F 464

Patent

active

058470590

ABSTRACT:
The present invention provides a catalyst and a process for increased catalyst activity and polymer yield. The catalyst system used in the process includes at least two supported metallocene catalyst precursor in combination with an oxyorganoaluminum. The process can be applied to the polymerization of olefins, preferably olefin of three carbon atoms and higher, particularly propylene. The catalyst activity and polymer yield for a dual supported metallocene catalyst are increased over that for a single supported metallocene catalyst. The polymer produced by this dual supported metallocene system has a relatively broad molecular weight distribution.

REFERENCES:
patent: 5350817 (1994-09-01), Winter et al.
patent: 5374700 (1994-12-01), Tsutsui et al.
patent: 5616665 (1997-04-01), Jejelowo et al.
Macromolecules, 1990, 23, pp. 4489-4491.

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