Process for preparing rubber composition for tire treads

Details Process for preparing rubber composition for tire treads Process for preparing rubber composition for tire treads

1980-01-30

1982-03-23

Seccuro, Carman J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

523351, 523353, 525236, C08K 304

Patent

active

043211682

ABSTRACT:
A process for preparing a tire tread rubber composition having improved rolling resistance and wet skid resistance comprising [I] 100 parts by weight of a rubber material composed of 25 to 75% by weight of substantially amorphous polybutadiene having a 1,2-bond unit content of 65 to 90 mole % and a Mooney viscosity (ML.sub.1+4, 100.degree. C.) of 20 to 100 and 75 to 25% by weight of natural rubber and/or cis-1,4-polyisoprene, and [II] 40 to 70 parts by weight of carbon black, said process comprising (1) mechanically compounding 40 to 60 parts by weight of the rubber material [I] with 40 to 70 parts by weight of carbon black [II], and then (2) adding to the resulting mixture the rubber material [I] in an amount sufficient to adjust the amount of the carbon black [II] to 40 to 70 parts by weight per 100 parts by weight of the rubber material [I] and mechanically compounding them.

REFERENCES:
patent: 3048559 (1962-08-01), Heller et al.
patent: 3696062 (1972-10-01), Lesage et al.
patent: 3725331 (1973-04-01), Lesage et al.
patent: 3978165 (1976-08-01), Stumpe et al.

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