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US 5,856,256 AGranted
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
A cationic metallocene complex with trisperfluorobiphenyl borate for use as a polymerization catalyst.
Claims6
A catalytic complex of the formula:
- (CpCp'MR).sup.+ (RBR'R".sub.2).sup.- where
- Cp and Cp' is each C.sub.5 H.sub.n R.sub.5-n (n is 0-5), indenyl, allyl, benzyl, or C.sub.5 H.sub.n R.sub.4-n XNR (n is 0-4);
- M is Th, Zr, Hf, Ti, or U;
- X is R.sub.2 '"Si, where R'" is an alkyrl (C.ltoreq.10) or aryl group (C.ltoreq.10);
- R and R'" is each alkyl (C.ltoreq.20), benzyl (C.ltoreq.20), aryl (C.ltoreq.20), hydride, or silyl;
- B is Boron;
- R' is a fluorinated biphenyl;
- and
- R" is a fluaorinated phenyl, fluorinated biphenyl, or fluorinated polycyclic fused ring group.
6 more elements
A method of preparing a catalyst includig the step of adding a compound of the formula CpCp' MRR', where
- Cp and Cp' is each C.sub.5 H.sub.n R.sub.5-n, (n is 0-5) indenyl, allyl, benzyl, or C.sub.5 H.sub.n R.sub.4-n XNR (n is 0-4);
- M is Ti, Zr, Hf, Th or U;
- X is R.sup.2 " Si where R" is an alkyl (C.ltoreq.10) or aryl group (C.ltoreq.10);
- and
- R and R' is each alyl (C.ltoreq.10), benzyl (C.ltoreq.20), aryl (C.ltoreq.20), hydride or silyl;
- to perfluorobiphenyl borane in a nonpolar solvent.
3 more elements
Dependencies are inferred from the claim text.