High vinyl polybutadiene or styrene-butadiene copolymer
First Claim
1. A high vinyl polybutadiene or styrene-butadiene copolymer obtained by polymerizing 1,3-butadiene alone or with styrene in a hydrocarbon solvent using an organolithium compound as an initiator, and coupling the resulting polymer with a coupling agent, characterized in that(1) the polybutadiene or styrene-butadiene copolymer contains at least 20% by weight of a polymer having in its molecular chain a linkage between butadienyl and at least one metal selected from the group consisting of silicon, germanium, tin and lead,(2) the styrene-butadiene copolymer has a styrene content of 40% by weight of less, and(3) the polybutadiene or the butadiene portion of said copolymer has a vinyl content of 50 to 95% by weight.
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Accused Products
Abstract
High vinyl polybutadiene or styrene-butadiene copolymer obtained by polymerizing 1,3-butadiene alone or with styrene in a hydrocarbon solvent using an organolithium compound as an initiator and coupling the resulting polymer, characterized in that
(1) the polybutadiene or styrene-butadiene copolymer comprises at least 20% by weight of a polymer having in its molecular chain a linkage between butadienyl and at least one metal selected from the group consisting of silicon, germanium, tin and lead,
(2) the styrene content of said copolymer is 40% by weight or less, and
(3) the polybutadiene or the butadiene portion of the styrene-butadiene copolymer has a vinyl content of 50 to 95%.
Said polybutadiene or styrene-butadiene copolymer has low rolling resistance, high wet skid resistance, highly improved fracture property and, an excellent processability.
83 Citations
9 Claims
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1. A high vinyl polybutadiene or styrene-butadiene copolymer obtained by polymerizing 1,3-butadiene alone or with styrene in a hydrocarbon solvent using an organolithium compound as an initiator, and coupling the resulting polymer with a coupling agent, characterized in that
(1) the polybutadiene or styrene-butadiene copolymer contains at least 20% by weight of a polymer having in its molecular chain a linkage between butadienyl and at least one metal selected from the group consisting of silicon, germanium, tin and lead, (2) the styrene-butadiene copolymer has a styrene content of 40% by weight of less, and (3) the polybutadiene or the butadiene portion of said copolymer has a vinyl content of 50 to 95% by weight.
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2. A high vinyl styrene-butadiene copolymer obtained by copolymerizing 1,3-butadiene with styrene in a hydrocarbon solvent using an organolithium compound as an initiator and coupling the resulting polymer with a coupling agent, characterized in that
(1) the copolymer contains at least 20% by weight of a styrene-butadiene copolymer having in its molecular chain a linkage between butadienyl and at least one metal selected from the group consisting of silicon, germanium, tin and lead, (2) the copolymer has a styrene content of 5 to 40% by weight, and (3) the butadiene portion of said copolymer has a vinyl content of 50 to 95%.
Specification