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AssigneeThe Goodyear Tire & Rubber Company
InventorsAdel Farhan Halasa, Wen-Liang Hsu, Laurie Elizabeth Austin
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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.
A catalyst system which consists of (a) an organolithium compound, (b) a barium alkoxide and (c) a lithium alkoxide.
A process for synthesizing a random styrene-butadiene rubber having a high trans, low vinyl content by a process which comprises copolymerizing styrene and 1,3-butadiene in an organic solvent in the presence of a catalyst system which consists of (a) an organolithium compound, (b) a barium alkoxide and (c) a lithium alkoxide.
A process for synthesizing trans polybutadiene rubber having a vinyl content which is within the range of about 5 percent to about 15 percent by a process which comprises polymerizing 1,3-butadiene in an organic solvent in the presence of a catalyst system which consists of (a) an organolithium compound, (b) a barium alkoxide and (c) a lithium alkoxide.
A catalyst system which consists of (a) an organometallic compound selected from the group consisting of organolithium compounds, organopotassium compounds, organomagnesium compounds and organosodium compounds, (b) a barium compound selected from the group consisting of barium carboxylates, barium phenolates, barium amines, barium amides, barium halides, barium nitrates, barium sulfates, barium phosphates and barium alcoholates, and (c) a lithium alkoxide.
Dependencies are inferred from the claim text.