Mixed catalyst system

Details Mixed catalyst system Mixed catalyst system

1997-12-16

2000-05-30

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, 526118, 526119, 526160, 526161, 526172, 526943, 526351, 502113, 502117, 502118, 502152, C08F 406, C08F 472, C08F 402

Patent

active

060692138

ABSTRACT:
It has been found that the use of at least one unsupported metallocene polymerization catalyst with at least one supported metallocene polymerization catalyst in the polymerization of olefins allows for better control of the polymerization, especially gas phase polymerization. Such a system takes advantage of the high activity of the unsupported catalyst and the stability of a supported catalyst. Additionally, the relative timing of the addition of the supported and unsupported catalysts to a reaction system can be used to control a continuous polymerization reaction by stabilizing the reactor bed with the supported catalyst prior to addition of the unsupported catalyst.

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