US Patent 7886791 Pneumatic radial tire for passenger car
Patent 7886791 was granted and assigned to Bridgestone on February, 2011 by the United States Patent and Trademark Office.
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A pneumatic radial tire for a passenger car having a pair of bead portions and a carcass having at least one carcass ply toroidally extending between a pair of bead cores embedded in the respective bead portions and containing organic fiber cords. The organic fiber cord is a polyketone fiber cord satisfying the following equation: σ≧−0.01E+1.2 and σ≧0.02, where σ is a thermal shrinkage stress at 177° C. (cN/dtex) and E is an elastic modulus at 25° C. under a load of 49N (cN/dtex). The cord has a ply-twisting coefficient N1 of 0.35-0.70 and a cable-twisting coefficient N2 of 0.50-0.95, where N1=n1×(0.125×D1/ρ)1/2×10−3, N2=n2×(0.125×D2/ρ)1/2×10−3, n1 is a ply twisting number (turns/10 cm), n2 is a cable twisting number (turns/10 cm), D1 is dtext of ply-twisted yarn, D2 is a total dtex, and ρ is a specific gravity of the cord (g/cm3).
US Patent 07886791 Pneumatic radial tire for passenger car US Patent 7886791 Pneumatic radial tire for passenger car
US Patent 07886791 Pneumatic radial tire for passenger car
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