Ionic metallocene catalyst compositions

Details Ionic metallocene catalyst compositions Ionic metallocene catalyst compositions

1994-10-05

1995-11-28

Pal, Asok

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526170, 526351, 526352, 5263485, 5263486, 502152, 502155, C08F 472, B01T 3100

Patent

active

054709270

ABSTRACT:
A method is disclosed for polymerizing olefins, diolefins, or acetylenically unsaturated monomers containing two or more carbon atoms, either alone or in combination with each other or with other polymerizable monomers, comprising contacting the monomers with an ionic polymerization catalyst comprising (1) a cation derived from a bis(cyclopentadienyl) Group IV-B metal compound by abstracting a ligand to create a positively charged species and (2) a stabilizing non-coordinating anion, said anion being sufficiently labile to permit displacement by the olefin, diolefin and/or acetylenically unsaturated monomer during polymerization. The process provides means of producing narrow molecular weight polyolefin polymers, increasing comonomer incorporation in copolymers and avoiding metal impurities in the polymer products.

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