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

C - Chemistry, Metallurgy

08

J

400/1124, 400/64

C08J 3/20 (2006.01) B60C 1/00 (2006.01) C08L 7/00 (2006.01) C08L 9/00 (2006.01) C08L 21/00 (2006.01)

Patent

CA 1124925

Abstract of the Disclosure A process for preparing a tire tread rubber composition having improved rolling resistance and wet skid resistance comprising (I) a rubber material com- posed 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 (ML1+4, 100°C) of 20 to 100 and 75 to 25% by weight of natural rubber and/or cis-1,4-polyisoprene, and (II) carbon black, said process comprising (I) 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.

345055

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