Process and catalyst for producing isotactic polyolefins

Details Process and catalyst for producing isotactic polyolefins Process and catalyst for producing isotactic polyolefins

C - Chemistry, Metallurgy

08

F

C08F 4/72 (2006.01) C08F 2/02 (2006.01) C08F 10/00 (2006.01) C08F 4/619 (2006.01) C08F 4/6192 (2006.01)

Patent

CA 2077713

This invention is for a metallocene catalyst component useful in preparing isotactic polyolefins, a catalyst system using this component and a process for polymerizing olefins using the catalyst component. The catalyst component consists of a bridged metallocene in which one of the cyclopentadienyl rings is substituted in a different manner from the other ring. One of the cyclopentadienyl ligands contains a bulky group in one and only one distal position and the other cyclopentadienyl ligand has bilateral or pseudobilateral symmetry. There is a steric difference between the two Cp rings. The catalyst component is a stereorigid metallocene described by the formula: R" (CpR n)(CpR'm)MeQ k wherein each Cp is a cyclopentadienyl or substituted cyclopenta- dienyl ring: each R n and R'm is a hydrocarbyl radical having 1-20 carbon atoms; R" is a structural bridge between the two Cp rings imparting stereorigidity to the Cp rings. Me is a transition metal; and each Q is a hydrocarbyl radical or is a halogen. R'm is selected so that (CpR'm) is a sterically different substituted cyclopentadienyl ring than (CpR'n). The use of a metallocene catalyst component with sterically different cyclopentadienyl rings in which one and only one of the distal positions of the cyclopentadienyl rings has a bulky group as a substituent produces isotactic polymer.

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