Patent ID: 8110056
Filing Date: 2012-02-07
Classification: B60C,C08K,C08L,Y10T

Abstract:
1. A process for preparing a studless tire having a tire tread, comprising: a step (I) of extruding a rubber composition for a tire tread comprising a diene rubber, 0.5 to 30 parts by weight of a zinc oxide whisker having four protuberances, 0.5 to 20 parts by weight of porous natural glass, and 0.5 to 20 parts by weight of glass fiber having an average fiber diameter of 1 to 100 μm and an average fiber length of 0.1 to 5 mm, based on 100 parts by weight of the diene rubber, wherein orientation of the fiber in the extrusion direction of the rubber is interrupted by compounding said glass fiber in the rubber together with said zinc oxide whisker having four protuberances, and wherein the rubber composition satisfies the equation: wherein X, Y and Z respectively represent the amounts by weight of said glass fiber, said zinc oxide whisker and said porous natural glass; a step (II) of molding the tire tread from the extruded rubber composition, wherein a ratio of the complex elastic modulus E1 in the tread thickness direction, to the complex elastic modulus E2 in the tread circumferential direction of a rubber sample cut out from the tread satisfies the equation: a step (III) of forming a studless tire having the molded tire tread.