Cyclopentadienyl-containing low-valent early transition...

Details Cyclopentadienyl-containing low-valent early transition... Cyclopentadienyl-containing low-valent early transition...

2007-01-09

2007-01-09

Lu, Caixia (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S134000, C526S329200, C526S329700, C526S943000

Reexamination Certificate

active

11121775

ABSTRACT:
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 comprisingin-line-formulae description="In-line Formulae" end="lead"?{Cp*MRR′n}+{A}−in-line-formulae description="In-line Formulae" end="tail"?wherein Cp* is a cyclopentadienyl or substituted cyclopentadienyl moiety; M is an early transition metal; R is a C1–C20hydrocarbyl; R′ are independently selected from hydride, C1–C20hydrocarbyl, SiR″3, NR″2, OR″, SR″, GeR″3, SnR″3, and C═C-containing groups (R″=C1–C10hydrocarbyl); 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.

REFERENCES:
patent: 6544922 (2003-04-01), Marks et al.

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