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AssigneeThe Goodyear Tire & Rubber Company
InventorsAdel Farhan Halasa, David John Zanzig, Wen-Liang Hsu, Paul Harry Sandstrom, Laurie Elizabeth Austin
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The subject invention discloses a pneumatic tire having an outer circumferential tread wherein said tread is a sulfur-cured rubber composition comprised of (a) an isoprene-butadiene diblock rubber, said isoprene-butadiene diblock rubber being comprised of a butadiene block and an isoprene-butadiene block, wherein said butadiene block has a number average molecular weight which is within the range of about 25,000 to about 350,000, wherein said isoprene-butadiene block has a number average molecular weight which is within the range of about 25,000 to about 350,000, wherein said isoprene-butadiene diblock rubber has essentially one glass transition temperature which is within the range of about -100.degree. C. to about -70.degree. C., wherein said isoprene-butadiene diblock polymer has a Mooney ML-4 viscosity at 100.degree. C. which is within the range of about 50 to about 140, wherein the repeat units derived from isoprene and 1,3-butadiene in the isoprene-butadiene block are in essentially random order, and wherein said isoprene-butadiene diblock polymer does not contain any blocks which are derived solely from isoprene; and (b) a second rubber selected from the group consisting of high vinyl polybutadiene rubber, styrene-isoprene-butadiene rubber, solution styrene-butadiene rubber and emulsion styrene-butadiene rubber.
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 an isoprene-butadiene diblock rubber, said isoprene-butadiene diblock rubber being comprised of a butadiene block and an isoprene-butadiene block, wherein said butadiene block has a number average molecular weight which is within the range of about 25,000 to about 350,000, wherein said isoprene-butadiene block has a number average molecular weight which is within the range of about 25,000 to about 350,000, wherein said isoprene-butadiene diblock rubber has essentially one glass transition temperature which is within the range of about -100.degree. C. to about -70.degree. C., wherein said isoprene-butadiene diblock rubber has a Mooney ML-4 viscosity at 100.degree. C. which is within the range of about 50 to about 140, wherein said isoprene-butadiene diblock rubber does not contain any blocks which are derived solely from isoprene, and wherein the repeat units derived from isoprene and 1,3-butadiene in the isoprene-butadiene block are in essentially random order;
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 an isoprene-butadiene diblock rubber, said isoprene-butadiene diblock rubber being comprised of a butadiene block and an isoprene-butadiene block, wherein said butadiene block has a number average molecular weight which is within the range of about 25,000 to about 350,000, wherein said isoprene-butadiene block has a number average molecular weight which is within the range of about 25,000 to about 350,000, wherein said isoprene-butadiene diblock rubber has a first glass transition temperature which is within the range of about -100.degree. C. to about -70.degree. C., wherein said isoprene-butadiene diblock rubber has a second glass transition temperature which is within the range of about -50.degree. C. to about 0.degree. C., wherein said isoprene-butadiene diblock polymer has a Mooney ML-4 at 100.degree. C. viscosity which is within the range of about 50 to about 140, wherein said isoprene-butadiene diblock rubber does not contain any blocks which are derived solely from isoprene, and wherein the repeat units derived from isoprene and 1,3-butadiene in the isoprene-butadiene block are in essentially random order;
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 50 to about 75 parts of an isoprene-butadiene diblock rubber, said isoprene-butadiene diblock rubber being comprised of a butadiene block and an isoprene-butadiene block, wherein said butadiene block has a number average molecular weight which is within the range of about 25,000 to about 350,000, wherein said isoprene-butadiene block has a number average molecular weight which is within the range of about 25,000 to about 350,000, wherein said isoprene-butadiene diblock rubber has essentially one glass transition temperature which is within the range of about -100.degree. C. to about -70.degree. C., wherein said isoprene-butadiene diblock polymer has a Mooney ML-4 viscosity at 100.degree. C. which is within the range of about 50 to about 140, wherein said isoprene-butadiene diblock rubber does not contain any blocks which are derived solely from isoprene, and wherein the repeat units derived from isoprene and 1,3-butadiene in the isoprene-butadiene block are in essentially random order;
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 50 to about 75 parts of an isoprene-butadiene diblock rubber, said isoprene-butadiene diblock rubber being comprised of a butadiene block and an isoprene-butadiene block, wherein said butadiene block has a number average molecular weight which is within the range of about 25,000 to about 350,000, wherein said isoprene-butadiene block has a number average molecular weight which is within the range of about 25,000 to about 350,000, wherein said isoprene-butadiene diblock rubber has a first glass transition temperature which is within the range of about -100.degree. C. to about -70.degree. C., wherein said isoprene-butadiene diblock rubber has a second glass transition temperature which is within the range of about -50.degree. C. to about 0.degree. C., wherein said isoprene-butadiene diblock polymer has a Mooney ML-4 at 100.degree. C. viscosity which is within the range of about 50 to about 140, wherein said isoprene-butadiene diblock rubber does not contain any blocks which are derived solely from isoprene, and wherein the repeat units derived from isoprene and 1,3-butadiene in the isoprene-butadiene block are in essentially random order;
Dependencies are inferred from the claim text.