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US 6,274,752 B1Granted
Organo-Lewis acid as cocatalyst for cationic homogeneous Ziegler-Natta olefin polymerizations
AssigneeNorthwestern University
InventorsTobin J. Marks, You-Xian Chen
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Abstract
Organo-Lewis acids of the formula BR′R″2 wherein B is boron, R′ is fluorinated biphenyl, and R″ is a fluorinated phenyl, fluorinated biphenyl, or fluorinated polycyclic fused ring group, and cationic metallocene complexes formed therewith. Such complexes are useful as polymerization catalysts.
Claims40
A catalytic complex selected from the group consisting of:
- A) a complex of the formula [CpCp′MMe(μ-Me)MeMCpCp′]⊕[MeBR′R″2]⊖
- B) a complex of the formula [CpCp′MH(μ-H)HMCpCp′]⊕[MeBR′R″2]⊖
- C) a complex of the formula [CpMMe2]⊕[MeBR′R″2]⊖
- D) a complex of the formula [C5HmR4−mXNRMMe]⊕[MeBR′R″2]⊖
- E) a complex of the formula [CpCp′MMe]⊕[MeBR′R″2]⊖
- where:
- Cp and Cp′ each is C5HnR5−n where n is 0-5, or indenyl;
- R is an alkyl or benzyl or aryl or silyl group, each having 20 or less carbon atoms;
- M is Th, Zr, Hf, or Ti;
- Me is methyl;
- B is boron;
- H is hydrogen;
- R′ is fluorinated biphenyl;
- R″ is a fluorinated phenyl, fluorinated biphenyl, or fluorinated polycyclic fused ring group;
- m is 0-4;
- X is R′″2Si, R′″ being alkyl or aryl, either one having 10 or less carbon atoms;
- and
- N is nitrogen.
15 more elements
Dependencies are inferred from the claim text.