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AssigneeNorthwestern University
InventorsTobin J. Marks, Lubin Luo, Sung Cheol Yoon
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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′n}+{A}− wherein Cp* is a cyclopentadienyl or substituted cyclopentadienyl moiety; M is an early transition metal; R is a C1–C20 hydrocarbyl; R′ are independently selected from hydride, C1–C20 hydrocarbyl, SiR″3, NR″2, OR″, SR″, GeR″3, SnR″3, and C═C-containing groups (R″=C1–C10 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.
A polymer formed by copolymerizing at least one polar monomer containing up to 20 carbon atoms and containing an olefinic carbon-carbon double bond selected from the group consisting of unsaturated acids and their derivatives, vinyl esters, vinyl amides, acrylonitrile, and α,β-unsaturated acids, anhydrides, esters, amides, and ketones, and at least one C2 to C20 nonpolar monomer containing an olefinic group under polymerization conditions using a catalyst formed by in situ reduction of a catalyst precursor comprising
A polymer formed by copolymerizing at least one polar monomer containing up to 20 carbon atoms and containing an olefinic carbon-carbon double bond selected from the group consisting of unsaturated acids and their derivatives, vinyl esters, vinyl amides, acrylonitrile, and α,β-unsaturated acids, anhydrides, esters, amides, and ketones, and at least one C2 to C20 nonpolar monomer containing an olefinic group under polymerization conditions using a catalyst formed by in situ reduction of a catalyst precursor comprising
Dependencies are inferred from the claim text.