Cyclopentadienyl-containing low-valent early transition metal olefin polymerization catalysts
A catalyst system useful to polymerize and co-polymerize polar and non-polar olefin monomers is formed by in situ reduction with a reducing agent of a catalyst precursor comprising {Cp*MRR'.sub.n }.sup.+ {A}.sup.- wherein Cp* is a cyclopentadienyl or substituted cyclopentadienyl moiety; M is an early transition metal; R is a C.sub.1 -C.sub.20 hydrocarbyl; R' are independently selected from hydride, C.sub.1 -C.sub.20 hydrocarbyl, SiR".sub.3, NR".sub.2, OR", SR", GeR".sub.3, and SnR".sub.3 containing groups (R"=C.sub.1 -C.sub.10 hydrocarbyl); n is an integer selected to balance the oxidation state of M; and A is a suitable non-coordinating anionic cocatalyst or precursor. This catalyst system may form stereoregular olefin polymers including syndiotactic polymers of styrene and methylmethacrylate and isotactic copolymers of polar and nonpolar olefin monomers such as methylmethacrylate and styrene.
- Research Organization:
- Northwestern Univ., Evanston, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FG02-86ER13511
- Assignee:
- Northwestern University (Evanston, IL)
- Patent Number(s):
- 6,544,922
- Application Number:
- 10/198,241
- OSTI ID:
- 879802
- Resource Relation:
- Patent File Date: 2002 Jul 18
- Country of Publication:
- United States
- Language:
- English
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Cyclopentadienyl-containing low-valent early transition metal olefin polymerization catalysts
Cyclopentadienyl-containing low-valent early transition metal olefin polymerization catalysts