摘要 |
The subject invention discloses a styrene- isoprene-butadiene rubber which is particularly valuable for use in making truck tire treads, said rubber being comprised of repeat units which are derived from about 5 weight percent to about 20 weight percent styrene, from about 7 weight percent to about '35 weight percent isoprene, and from about 55 weight percent to about 38 weight percent 1,3-butadiene, wherein the repeat units derived from styrene, isoprene and 1,3-butadiene are in essentially random order, wherein from about 25% to about 40% of the repeat units derived from the 1,3-butadiene are of the cis-microstructure, wherein from about 40% to about 60% of the repeat units derived from the 1,3-butadiene are of the traps-microstructure, wherein from about 5% to about 25% of the repeat units derived from the 1,3- butadiene are of the vinyl-microstructure, wherein from about 75% to about 90% of the repeat units derived from the isoprene are of the 1,4- microstructure, wherein from about 10% to about 25% of the repeat units derived from the isoprene are of the 3;4-microstructure, wherein the rubber has a glass transition temperature which is within the range of about -90.degree.C to about -70.degree.C, wherein the rubber has a number average molecular weight which is within the range of about 150,000 to about 400,000, wherein the rubber has a weight average molecular weight of about 300;000 to about 800,000, and wherein the rubber has an inhomogeneity which is within the range of about 0.5 to about 1.5. |
申请人 |
THE GOODYEAR TIRE & RUBBER COMPANY |
发明人 |
RODGERS, MICHAEL B.;MEZYNSKI, STANLEY M.;HALASA, ADEL F.;HSU, WEN-LIANG;MATRANA, BARRY A.;COX, JOEL L. |