Process for producing syndiotactic polyolefins

Details Process for producing syndiotactic polyolefins Process for producing syndiotactic polyolefins

1991-11-15

1994-08-02

Smith, Edward J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526116, 526127, 526160, C08F 4622, C08F 4626, C08F 1000

Patent

active

053346777

ABSTRACT:
The invention provides a metallocene catalyst for use in preparing syndiotactic polyolefins. The catalyst comprises a bridged metallocene in which one of the cyclopentadienyl rings is substituted in a substantially different manner from the other ring. It was discovered that this type of catalyst is highly syndiospecific, and it also produces a polymer with a novel microstructure. The invention further includes the use of one or more of the catalysts in a polymerization process. The catalyst is generally described by the formula

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patent: 4769510 (1988-09-01), Kaminsky et al.
patent: 4849487 (1989-07-01), Kaminsky et al.
patent: 4874734 (1989-10-01), Kioka et al.
patent: 4935474 (1990-06-01), Ewen et al.

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