Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1993-09-22
1995-04-11
Teskin, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526335, 525237, 5253328, 152209R, 152450, C08F23608, B60C 500
Patent
active
054059275
ABSTRACT:
The subject invention discloses an isoprenebutadiene rubber which is particularly valuable for use in making truck tire treads, said rubber being comprised of repeat units which are derived from about 20 weight percent to about 50 weight percent isoprene and from about 50 weight percent to about 80 weight percent 1,3-butadiene, wherein the repeat units derived from isoprene and 1,3-butadiene are in essentially random order, wherein from about 3% to about 10% of the repeat units in said rubber are 1,2-polybutadiene units, wherein from about 50% to about 70% of the repeat units in said rubber are 1,4-polybutadiene units, wherein from about 1% to about 4% of the repeat units in said rubber are 3,4-polyisoprene units, wherein from about 25% to about 40% of the repeat units in the polymer are 1,4-polyisoprene units, wherein the rubber has a glass transition temperature which is within the range of about -90.degree. C. to about -75.degree. C., and wherein the rubber has a Mooney viscosity which is within the range of about 55 to about 140. The isoprene-butadiene rubber of this invention will preferably have a Mooney viscosity which is within the range of about 85 to about 130 and will more preferably have a Mooney viscosity which is within the range of about 115 to about 125.
REFERENCES:
patent: 4843120 (1989-06-01), Halasa et al.
patent: 5047483 (1991-09-01), Halasa et al.
patent: 5104941 (1992-04-01), Wolpers et al.
patent: 5137998 (1992-08-01), Hsu et al.
patent: 5239023 (1993-08-01), Hsu et al.
patent: 5272220 (1993-12-01), Rodgers et al.
Gabor Jennifer L.
Halasa Adel F.
Hsu Wen-Liang
Matrana Barry A.
Rodgers Michael B.
Rockhill Alvin T.
Teskin Fred
The Goodyear Tire & Rubber Company
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