Trans 1,4-butadiene/isoprene copolymers and tire with tread thereof
AssigneeThe Goodyear Tire & Rubber Company
InventorsPaul Harry Sandstrom, Wen-Liang Hsu
Life of this patent
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Abstract
Trans 1,4-copolymers of butadiene and isoprene are provided as blends with other elastomers, including partial replacement of natural cis 1,4-polyisoprene in elastomer compositions. Pneumatic rubber tires with components composed of such elastomer blends, including tire treads, are also included.
Claims15
A rubber composition comprised of, based upon 100 parts by weight rubber (phr), (A) about 2 to about 20 phr of a trans 1,4-copolymer of isoprene and butadiene containing about 20 to about 80 percent units derived from isoprene and having a Tg within a range of about -70.degree. C. to about -80.degree. C.;
- and, correspondingly, (B) about 80 to about 98 phr of at least one other elastomer selected from homopolymers and copolymers of isoprene and 1,3-butadiene and copolymers of isoprene and/or 1,3-butadiene with a vinyl aromatic hydrocarbon selected from styrene and alpha-methylstyrene.
Dependencies are inferred from the claim text.