Styrene-isoprene-butadiene rubber

Details Styrene-isoprene-butadiene rubber Styrene-isoprene-butadiene rubber

C - Chemistry, Metallurgy

08

F

C08F 236/10 (2006.01) B60C 11/00 (2006.01) C08F 236/06 (2006.01) C08L 7/00 (2006.01) C08L 9/06 (2006.01)

Patent

CA 2088847

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°C to about -70°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.

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