Pneumatic radial tire for passenger car

Details Pneumatic radial tire for passenger car Pneumatic radial tire for passenger car

2011-02-15

2011-02-15

Johnstone, Adrienne C (Department: 1791)

Resilient tires and wheels

Tires, resilient

Pneumatic tire or inner tube

C152S451000

Reexamination Certificate

active

07886791

ABSTRACT:
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 N1of 0.35-0.70 and a cable-twisting coefficient N2of 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, n1is a ply twisting number (turns/10 cm), n2is a cable twisting number (turns/10 cm), D1is dtext of ply-twisted yarn, D2is a total dtex, and ρ is a specific gravity of the cord (g/cm3).

REFERENCES:
patent: 2008/0156409 (2008-07-01), Yokokura et al.
patent: 2001295134 (2001-10-01), None
patent: 2001-341504 (2001-12-01), None
patent: 2002-307908 (2002-10-01), None
patent: 2004-218189 (2004-08-01), None
patent: 2004-308024 (2004-11-01), None
patent: 2004306635 (2004-11-01), None
English machine translation of JP 2004-218189 A, Aug. 5, 2004.

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