Homogeneous catalysts for stereoregular olefin polymerization
The synthesis, and use as precatalysts of chiral organozirconium complexes for olefin polymerization are disclosed, having the structure (C{sub 5}R{prime}{sub 4{minus}x}R*{sub x})A(C{sub 5}R{double_prime}{sub 4{minus}y}R{double_prime}{prime}{sub y})MQ{sub p}, where x and y represent the number of unsubstituted locations on the cyclopentadienyl ring; R{prime}, R{double_prime}, R{double_prime}{prime}, and R* represent substituted and unsubstituted alkyl groups having 1--30 carbon atoms and R* is a chiral ligand; A is a fragment containing a Group 13, 14, 15, or 16 element of the Periodic Table; M is a Group 3, 4, or 5 metal of the Periodic Table; and Q is a hydrocarbyl radical, or halogen radical, with 3{>=}p{>=}0. Related complexes may be prepared by alkylation of the corresponding dichlorides. In the presence of methylalumoxane or triarylborane cocatalysts, these complexes form ``cation-like`` species which are highly active for olefin polymerization. In combination with a Lewis acid cocatalyst, propylene or other {alpha}-olefin polymerization can be effected with very high efficiency and isospecificity. 1 fig.
- Research Organization:
- Northwestern Univ., Evanston, IL (United States)
- DOE Contract Number:
- FG02-86ER13511
- Assignee:
- Northwestern Univ., Evanston, IL (United States)
- Patent Number(s):
- US 5,455,317/A/
- Application Number:
- PAN: 8-373,869
- OSTI ID:
- 106692
- Resource Relation:
- Other Information: PBD: 3 Oct 1995
- Country of Publication:
- United States
- Language:
- English
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Homogeneous catalysts for stereoregular olefin polymerization
Homogeneous catalysts for stereoregular olefin polymerization