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US 5,753,579 AGranted
Trans microstructure directing initiator system
AssigneeThe Goodyear Tire & Rubber Company
InventorsGeorge Jalics, Adel Farhan Halasa
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AssigneeThe Goodyear Tire & Rubber Company
InventorsGeorge Jalics, Adel Farhan Halasa
Estimating the term…
The process of this invention can be utilized to synthesize polymers having a high trans microstructure. The polymers which can be prepared utilizing the procedure of this invention include high trans-1,4-polybutadiene, styrene-isoprene-butadiene terpolymers with high trans-1,4-polybutadiene microstructures, high trans-isoprene-butadiene copolymers, and styrene-butadiene copolymers having high trans-1,4-polybutadiene microstructures. Such polymers can be utilized in tire tread rubber compounds which exhibit improved wear characteristics, tear resistance and low temperature performance characteristics. This invention more specifically reveals a process for synthesizing a high trans polymer which comprises adding (a) at least one organolithium initiator or organomagnesium initiator, (b) an organoaluminum compound, (c) a barium alkoxide, and (d) an organozinc compound to a polymerization medium which is comprised of an organic solvent and at least one conjugated diene monomer.
A catalyst system which is the reaction product of (a) at least one organolithium initiator, (b) triisobutyl aluminum, (c) barium 2-ethylhexoxide and (d) an organozinc compound, wherein the molar ratio of the triisobutyl aluminum to the barium 2-ethylhexoxide is within the range of about 0.1:1 to about 8:1;
Dependencies are inferred from the claim text.