C - Chemistry – Metallurgy – 07 – F
Patent
C - Chemistry, Metallurgy
07
F
252/93, 260/426.
C07F 17/00 (2006.01) C08F 4/622 (2006.01) C08F 4/74 (2006.01) C08F 10/00 (2006.01) C08F 110/06 (2006.01) C08F 4/639 (2006.01) C08F 4/6392 (2006.01)
Patent
CA 1338600
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 Image wherein each Cp is a cyclopentadienyl or substituted cyclopentadienyl ring; each Rn and R'm is the same or different and is a hydrocarbyl radicals having 1-20 carbon atoms; R" is a structural bridge between the two Cp rings imparting stereorigidity to the catalyst; Me is a group 4b, 5b, or 6b metal from the Periodic Table of Elements; each Q is a hydrocarbyl radical having 1-20 carbon atoms or is a halogen; 0 k 4; 0 n 4; 1 m 4; and wherein R'm is selected such that (CpR'm) is a sterically different ring than (CpRn).
599936
Ewen John A.
Razavi Abbas
Fina Technology Inc.
Gowling Lafleur Henderson Llp
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