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[prime][double prime][sub y])-M-Q[sub p], where x and y represent the number of unsubstituted locations on the cyclopentadienyl ring; R[prime], R[double prime], R[prime][double 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.
- DOE Contract Number:
- FG02-86ER13511
- Assignee:
- Northwestern Univ., Evanston, IL (United States)
- Patent Number(s):
- US 5330948; A
- Application Number:
- PPN: US 7-860784
- OSTI ID:
- 6993580
- Resource Relation:
- Patent File Date: 31 Mar 1992
- Country of Publication:
- United States
- Language:
- English
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Homogeneous catalysts for stereoregular olefin polymerization
Homogeneous catalysts for stereoregular olefin polymerization
Related Subjects
ALKENES
POLYMERIZATION
CATALYSTS
CHEMICAL PREPARATION
CHLORIDES
MOLECULAR STRUCTURE
ORGANOMETALLIC COMPOUNDS
ZIRCONIUM COMPLEXES
CHEMICAL REACTIONS
CHLORINE COMPOUNDS
COMPLEXES
HALIDES
HALOGEN COMPOUNDS
HYDROCARBONS
ORGANIC COMPOUNDS
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
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