Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2007-11-06
2007-11-06
Teskin, Fred (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S174000, C526S176000, C526S180000, C526S181000, C502S153000, C502S154000
Reexamination Certificate
active
11468921
ABSTRACT:
The present invention is directed to a catalyst system for synthesizing rubbery polymers, such as polybutadiene rubber and styrene-butadiene rubber, having a high trans microstructure. The catalyst system, in one embodiment, includes (a) a barium salt of an alcohol that is soluble in a hydrocarbon solvent, and (b) an organomagnesium compound. In one example, the alcohol is a primary or secondary alcohol. The catalyst system can further optionally include an alkali metal alkoxide, an organolithium compound, an amine compound, or mixtures thereof.
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Austin Laurie Elizabeth
Halasa Adel Farhan
Hsu Wen-Liang
Teskin Fred
The Goodyear Tire and Rubber Company
Wood, Herron and Evans, L.L.P.
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