Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1992-09-14
1993-11-16
Seidleck, James J.
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
428492, 525 95, 525 98, 525 99, 525314, 526335, 526340, 152450, B60C 501, C08L 5302, C08F29300
Patent
active
052622134
ABSTRACT:
The subject invention discloses a styrene-butadiene rubber (SBR) which is particularly valuable for use in making truck tire treads, said rubber being comprised of repeat units which are derived from about 10 weight percent to about 20 weight percent styrene and from about 80 weight percent to about 90 weight percent 1,3-butadiene, wherein the repeat units derived from styrene and 1,3-butadiene have a sequence distribution wherein at least about 55% of the styrene repeat units are in blocks of only one styrene repeat unit, wherein at least about 75% of the styrene repeat units are in blocks of 1 or 2 repeat units, and wherein at least about 5% of the styrene repeat units are in blocks of more than 8 repeat units, wherein from about 32% to about 40% of the repeat units derived from the 1,3-butadiene are of the cis-microstructure, wherein from about 50% to about 60% of the repeat units derived from the 1,3-butadiene are of the trans-microstructure, wherein from about 6% to about 15% of the repeat units derived from the 1,3-butadiene are of the vinyl-microstructure, wherein the rubber has a glass transition temperature which is within the range of about -85.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.
REFERENCES:
patent: 4843120 (1989-06-01), Halasa et al.
patent: 4845165 (1989-07-01), Halasa et al.
patent: 5047483 (1991-09-01), Halasa et al.
patent: 5070148 (1991-12-01), Hsu et al.
patent: 5137998 (1992-08-01), Hsu et al.
Halasa Adel F.
Hsu Wen-Liang
Matrana Barry A.
Mezynski Stanley M.
Rodgers Michael B.
Clark W. R. M.
Rockhill Alvin T.
Seidleck James J.
The Goodyear Tire & Rubber Company
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