B - Operations – Transporting – 60 – C
Patent
B - Operations, Transporting
60
C
152/90
B60C 9/18 (2006.01) B60C 1/00 (2006.01)
Patent
CA 1228282
BRIDGESTONE 58-223,267 Abstract of the Disclosure A pneumatic radial tire for passenger cars having a good high-speed running performance is disclosed, which comprises a tread portion, a pair of sidewalls portions, a carcass reinforcing these portions and composed of at least one ply containing cords arranged in a direction perpendicular to the equational plane of the tire, and a belt disposed between the carcass and the tread portion and composed of plural inextensible cord layers. In the tire of this type, the said tread portion is composed of a composite rubber divided into at least two composite rubber layers in a direction of the thickness, in which an inner rubber layer near to the belt layer has a dynamic modulus (E') of 100-250 kg/cm2 and an outer rubber layer has a dynamic modulus (E') of 70-150 kg/cm2 and a loss tangent (tan .delta.) of at least 0.25, and a ratio in dynamic modulus of the inner rubber layer to the outer rubber layer is at least 1.15. - 14 -
468150
Kawabata Misao
Moriya Masashiro
Takiguchi Eiji
Ushikubo Hisao
Yamaoka Masataka
Bridgestone Corporation
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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