Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Organic compound containing
Reexamination Certificate
2006-08-08
2006-08-08
Lorengo, J. A. (Department: 1755)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Organic compound containing
C502S157000, C502S162000, C502S169000, C502S170000, C502S171000
Reexamination Certificate
active
07087549
ABSTRACT:
This invention reveals a catalyst system for use in isothermal polymerizations which consists essentially of (a) an organolithium compound, (b) a calcium alkoxide and (c) a lithium alkoxide. The subject invention further discloses a process for synthesizing a random styrene-butadiene rubber having a low vinyl content by a process which comprises copolymerizing styrene and 1,3-butadiene under isothermal conditions in an organic solvent in the presence of a catalyst system which consists essentially of (a) an organolithium compound, (b) a calcium alkoxide and (c) a lithium alkoxide. An amine can also be added to the catalyst system to increase the molecular weight (Mooney viscosity) of the rubber.
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Chem. Abstract 76:155173: Fujio et al, Nippon Kagaku Kaishi, vol. 2, pp. 447-453, (1972).
Halasa Adel Farhan
Hsu Wen-Liang
Zuppo, III John Robert
Lorengo J. A.
Pasterczyk J.
Rockhill Alvin T.
The Goodyear Tire & Rubber Company
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