Patent ID: 8701727
Filing Date: 2014-04-22
Classification: B60C,C08K,C08L,Y10S,Y10T

Abstract:
1. A pneumatic truck drive tire comprising a tread, the tread comprising a tread cap, a tread base, and an undertread disposed between the tread cap and the tread base; the tread cap comprising a rubber composition comprising: 100 part by weight, per 100 parts by weight of rubber (phr) of a rubber consisting of from 52 to 64 phr of polyisoprene rubber, from 22 to 27 phr of cis 1,4-polybutadiene rubber, and from 13 to 21 phr of styrene-butadiene rubber; and 47 to 57 phr of carbon black; wherein the tread cap has a tan delta (100° C., 10% strain, 1 Hz) ranging from 0.13 to 0.16, a storage modulus (100° C., 1% strain, 1 Hz) ranging from 2 to 2.5 MPa, and a tear strength (100° C.) ranging from 19 to 23 N; the undertread comprising a rubber composition comprising: 100 phr of a rubber consisting of from 71 to 86 phr of polyisoprene rubber and from 14 to 29 phr of cis 1,4-polybutadiene rubber; from 19 to 23 phr of silica; and from 29 to 36 phr of carbon black; wherein the undertread has a tan delta (100° C., 10% strain, 1 Hz) ranging from 0.1 to 0.14, a storage modulus (100° C., 1% strain, 1 Hz) ranging from 1.8 to 2.2 MPa, and a tear strength (100° C.) ranging from 28 to 34 N.