Patent ID: 8936056
Filing Date: 2015-01-20
Classification: B60C,C08K,C08L,Y10T

Abstract:
1. A heavy vehicle tire having a tread and an undertread, the tread, the undertread or both being constituted at least in part from a material based upon a rubber composition, the rubber composition comprising, per 100 parts by weight of rubber: between 80 and 100 phr of a natural rubber; between 0 and 20 phr of a synthetic polyisoprene rubber; a reinforcement filler comprising a) a highly dispersible silica in an amount of between 30 and 45 phr and b) a carbon black in an amount of between (0.75)C phr and (1.25)C phr as determined by the equation wherein Si is the amount (phr) of the highly dispersible silica; a silane coupling agent; and a sulfur curing system comprising between 1.5 and 3 phr of free sulfur and between (0.9)A phr and (1.1)A phr of a sulfenamide accelerator, wherein A is determined by the formula wherein S is the quantity (phr) of the free sulfur, Y is a weight fraction of the silica reinforcement filler based on the total weight of the reinforcement filler and MW is a molecular weight of the sulfenamide accelerator.