Patent ID: 6147178
Filing Date: 2000-11-14
Classification: B60C,C08C,C08L,Y02T

Abstract:
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.