B - Operations – Transporting – 60 – C
Patent
B - Operations, Transporting
60
C
152/82
B60C 9/08 (2006.01) B60C 1/00 (2006.01) B60C 11/00 (2006.01) C08L 51/04 (2006.01) C08L 53/00 (2006.01)
Patent
CA 1119929
ABSTRACT OF THE DISCLOSURE A pneumatic radial tire for passenger cars having excellent wet skid resistance and cornering performance and a low rolling resistance is disclosed. This tire comprises a casing reinforced with a carcass of a radial construction and a belt superimposed about a crown portion of the carcass, and a tread of a cap-base rubber double laminate structure having a volume ratio of cap rubber to base rubber of 4:1 to 3:7. The cap rubber is a styrene-butadiene copolymer rubber having a composition and properties required for improving the wet skid resistance on wet road surface. The base rubber consists essentially of a polybutadiene rubber containing a polymer formed by block or graft polymerization of syn-1,2-polybutadiene with cis-1,4-polybutadiene having a weight average molecular weight of not less than 350,000, the polymer having a microstructure containing 6 to 20 wt% of syn-1,2-structure, at least 40 wt% of the syn-1,2-poly- butadiene being crystallized and formed into short fibers having an average diameter of 0.05 to 1 µm and an average length of 0.8 to 10 µm, or is a blend consisting essentially of at least 10 wt% of the polybutadiene rubber and the remainder of the other diene rubber, and is compounded with 25 to 60 parts by weight of carbon black having an iodine absorption value of not less than 40 m?/g and a dibutyl phthalate absorption value of not less than 60 m?/100 g based on 1.00 parts by weight of the total rubber content of the base rubber.
351881
Ikeda Nobumasa
Kusakabe Noboru
Bridgestone Tire Company Limited
Swabey Ogilvy Renault
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