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US 5,312,794 AGranted
Catalyst system for olefin polymerization
AssigneeShell Oil Company
InventorDonald R. Kelsey
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Abstract
A catalyst system and process for the polymerization of cyclic olefins, such as dicyclopentadiene, are disclosed. The catalyst system contains a transition metal hydrotrispyrazolylborate complex having the formula: Tp--M--L.sub.3 wherein Tp is a hydrotrispyrazolylborate ligand, M is tungsten or molybdenum, and L is independently a ligand selected from the group consisting of oxo, phenoxy, alkoxy, and halides, provided that at least one L is a halide, and a co-catalyst.
Claims9
A cyclic olefin polymerization catalyst system comprising:
- (a) a transition metal hydrotrispyrazolylborate complex having the formula:
- Tp--M--L.sub.3
- wherein Tp is a hydrotrispyrazolylborate ligand, M is tungsten or molybdenum, and L is independently a ligand selected from the group consisting of oxo, phenoxy, alkoxy, pyrazole, and halides provided that at least one L is a halide;
- and
- (b) a co-catalyst for ring opening cycloolefin polymerization.
2 more elements
Dependencies are inferred from the claim text.