PNEUMATIC TIRE TREADS AND THEIR PRODUCTION

摘要

In the production of vehicle tires, a vulcanizable tread composition which includes a reinforcing agent is applied to the tread portion of a tire mold and a tire body is then positioned in the mold against this tread, as by casting the tire body. The tread is prepared from an elastomeric polymer selected from the class consisting of (a) polyamino polyethers and polyesters, and (b) polyamino polymers of aliphatic olefins, by reacting the same with a diisocyanate in a one-step reaction. Alternatively, polyhydroxy polymers may be blended with these polyaminio polymers or with diamino-non-polymeric materials to produce urea-urethanes in a one-step reaction, such as (a) polyhydroxy conjugated diene homopolymers or copolymers, (b) polyhydroxy copolymers of a conjugated diene and an aromatic vinyl monomer, (c) polyhydroxy copolymers of a conjugated diene and a vinyl nitrile monomer, (d) copolymers of such polyhydroxy polymers and diamino non-polymeric materials and (f) copolymers of polyamino polymers and dihydroxy non-polymeric materials. The ratio of the reactants represented as NCO/NHR or NCO/[OH+NHR] in which R is hydrogen, an alkyl or aryl radical, must be at least about 1.15 or higher up to 2 or even 3 or higher. Auxiliary peroxide, etc. cures of the the blends of the polyamino polymers with (a) polyhydroxy conjugated diene homopolymers or copolymers and (b) polyhydroxy copolymers of a conjugated diene and an aromatic vinyl monomer and polyhydroxy copolymer of a conjugated diene and a vinyl nitrile monomer or blends of such polyhydroxy polymers and copolymers with diamino non-polymeric materials may also be used.