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Cyclopentadienyl-containing low-valent early transition metal olefin polymerization catalysts

United States Patent

December 30, 2003
View the Complete Patent at the US Patent & Trademark Office
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 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, SnR".sub.3, and C.dbd.C containing groups (R".dbd.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.
Marks; Tobin J. (Evanston, IL), Luo; Lubin (Baton Rouge, LA), Yoon; Sung Cheol (Evanston, IL)
Northwestern University (Evanston, IL)
09/ 608,855
June 30, 2000
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention, in part, was made with Government support under Grant No. 86 ER 13511 awarded by the United States Department of Energy. The United States Government may have certain rights in this invention.