Patent Number: 7,825,202

Title: Potassium based catalyst systems for synthesizing rubbery polymers

Abstract: The present invention is directed to a catalyst system for synthesizing rubbery polymers, such as styrene-butadiene rubber, that can be utilized in tire tread rubbers. The catalyst system, in one embodiment, includes an organolithium compound and a potassium alkyl borohydride or potassium alkyl aluminum hydride defined by: (R).sub.3A.sup.-(H)K.sup.+, wherein A is boron or aluminum, H is hydrogen, K is potassium, and R, which is the same or different, is either H, a C.sub.1-C.sub.10 alkyl, a C.sub.3-C.sub.10 cycloalkyl, phenyl, or phenyl substituted C.sub.1-C.sub.10 alkyl, or a C.sub.3-C.sub.10 cycloalkyl, with the proviso that at least one R is a C.sub.1-C.sub.10 alkyl, and further wherein any two R's may optionally be part of a carbocyclic ring. The rubbery polymers can have low to medium vinyl microstructure content, i.e., from about 10% to about 40%, and are useful in tire tread rubber compounds which can exhibit improved wear and tear characteristics.

Inventors: Zuppo, III; John Robert (Canfield, OH), Halasa; Adel Farhan (Bath, OH), Hsu; Wen-Liang (Cuyahoga Falls, OH), Hsu, legal representative; Leh-Yeh (Cuyahoga Falls, OH)

Assignee: The Goodyear Tire & Rubber Company

International Classification: C08F 4/44 (20060101); B01J 31/14 (20060101); C08F 4/52 (20060101); C08F 4/56 (20060101)

Expiration Date: 2019-11-02 0:00:00