Process and catalyst system for synthesizing random trans SBR wi

Details Process and catalyst system for synthesizing random trans SBR wi Process and catalyst system for synthesizing random trans SBR wi

1998-05-04

2000-08-15

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526174, 526176, 526183, 526335, 526337, 526340, 502154, 502155, 502157, C08F 450, C08F 3606

Patent

active

061038423

ABSTRACT:
The process and catalyst system of this invention can be utilized to synthesize a highly random styrene-butadiene rubber having a high trans content by solution polymerization. The styrene-butadiene rubber made by the process of this invention can be utilized in tire tread rubbers that exhibit improved wear characteristics. This invention more specifically reveals a catalyst system for use in exothermal polymerizations which consists essentially of (a) an organolithium compound, (b) a barium 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 barium alkoxide and (c) a lithium alkoxide.

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patent: 5100965 (1992-03-01), Hsu et al.
patent: 5317062 (1994-05-01), Rodgers et al.
patent: 5753579 (1998-05-01), Jalics et al.

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