Patent ID: 6293325
Filing Date: 2001-09-25
Classification: B60C,C08F,C08L,Y10T

Abstract:
A pneumatic tire having an outer circumferential tread wherein said tread is a sulfur-cured rubber composition comprised of, based on 100 parts by weight of rubber, (a) from about 30 to about 80 parts of a modified isoprene-butadiene rubber, wherein said modified isoprene-butadiene rubber is comprised of polymer chains containing repeat units which are derived from 1,3-butadiene, isoprene and from about 0.5 weight percent to about 3 weight percent styrene, wherein the repeat units which are derived from styrene are in blocks at the ends of the polymer chains, wherein the modified isoprene-butadiene rubber has a glass transition temperature which is within the range of about -105.degree. C. to about -65.degree. C. and wherein the rubbery polymer has a number average molecular weight which is within the range of about 50,000 to about 600,000; (b) from about 20 to about 70 parts of a second rubber selected from the group consisting of high vinyl polybutadiene rubber, medium vinyl polybutadiene rubber and styrene-isoprene-butadiene rubber; (c) silica; and (d) a silica coupling agent.