The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 23, 2007
Filed:
Aug. 30, 2006
Adel Farhan Halasa, Bath, OH (US);
Wen-liang Hsu, Cuyahoga Falls, OH (US);
Jean Steininger Clites, North Canton, OH (US);
Timothy John Wolfgang, Kent, OH (US);
Adel Farhan Halasa, Bath, OH (US);
Wen-Liang Hsu, Cuyahoga Falls, OH (US);
Jean Steininger Clites, North Canton, OH (US);
Timothy John Wolfgang, Kent, OH (US);
The Goodyear Tire & Rubber Company, Akron, OH (US);
Abstract
The present invention is directed to a batch process for synthesizing rubbery polymers, such as styrene-butadiene rubber, having a high trans microstructure. In one embodiment, the batch process involves mixing a catalyst system with styrene and butadiene monomers in a single reactor, with additional butadiene monomer being added after a desired period of time to further drive styrene conversion and, thus, provide a desirable high trans rubbery polymer, e.g., styrene-butadiene rubber. The copolymerization process can be conducted at a temperature in the range of about 20° C. to about 180° and over a period of about 1 to about 4 hours. The catalyst system can include (a) an organolithium compound, (b) a group IIa metal salt, and (c) an organoaluminum compound. The catalyst system may further optionally include an amine compound and/or an organomagnesium compound.