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
- 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
020500* -- Petroleum-- Products & By-Products
ALKENES
CATALYSTS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COMPLEXES
HALIDES
HALOGEN COMPOUNDS
HYDROCARBONS
MOLECULAR STRUCTURE
ORGANIC COMPOUNDS
ORGANOMETALLIC COMPOUNDS
POLYMERIZATION
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
ZIRCONIUM COMPLEXES