Diene rubber, process for producing the rubber and rubber composition containing the same
AssigneeNippon Zeon Co., Ltd.
InventorsMasao Nakamura, Yukio Takagishi, Manabu Tomisawa
Life of this patent
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Abstract
A diene rubber comprised of a conjugated diene homopolymer or a conjugated diene/aromatic vinyl copolymer; the homopolymer or copolymer having on at least one end of its polymer chain a quaternary ammonium group to which four carbon atoms have been bound; at least 10% of the bound conjugated diene units being a vinyl bond; and the homopolymer or copolymer further having a weight average molecular weight (Mw) of 100,000 to 2,000,000. This rubber exhibits well reduced heat build-up, which is an index of a well reduced rolling resistance, and having tensile strength and abrasion resistance.
Claims16
A diene rubber comprised of a conjugated diene/aromatic vinyl copolymer;
- said copolymer having on at least one end of its polymer chain a quaternary ammonium group to which four carbon atoms have been bound;
- at least 10% by weight of the bound conjugated diene units being a vinyl bond;
- said copolymer further having a weight average molecular weight (Mw) of 100,000 to 2,000,000;
- the ratio of conjugated diene units/aromatic vinyl units in the copolymer being in the range of 40/60 to 95/5 by weight;
- the content of an isolated short chain composed of one aromatic vinyl unit in the copolymer being at least 40% by weight based on the weight of the total bound aromatic vinyl units;
- and the content of a long chain composed of at least eight connected aromatic vinyl units in the copolymer being not larger than 5% by weight based on the weight of the total bound aromatic vinyl units.
A process for producing a diene rubber characterized in that a conjugated diene is polymerized alone or a conjugated diene and an aromatic vinyl are copolymerized in a hydrocarbon solvent by using an organic active metal amide as an initiator, to give a homopolymer or copolymer;
- and then the homopolymer or copolymer is allowed to react with an alkylating agent.
A process for producing a diene rubber characterized in that a conjugated diene is polymerized alone or a conjugated diene and an aromatic vinyl are copolymerized in a hydrocarbon solvent by using an organic active metal amide as an initiator, to give a homopolymer or copolymer, having an active metal bound to a terminal of the polymer chain thereof;
- the homopolymer or copolymer is allowed to react with a polyfunctional coupling agent and/or a modifier (X);
- and then the homopolymer or copolymer is allowed to react with an alkylating agent.
Dependencies are inferred from the claim text.