Pneumatic tire with hybrid material bead apex

Abstract

A pneumatic tire comprises a bead apex disposed in each bead portion, and a carcass ply extending between the bead portions and turned up in each bead portion so as to wrap the bead apex therein, the bead apex made of a hybrid material which is compounded from rubber, synthetic resin and short fiber at least. Preferably, the short fiber has an average diameter of 0.01 to 0.20 mm and an average length of 1.0 to 10.0 mm, and the proportion of the short fiber is 3 to 15 parts by weight with respect to 100 parts by weight of the rubber. The hybrid material has a 100% modulus of at least 10.0 MPa, a tensile strength of at least 10.0 MPa, a breaking elongation EB of at least 200%, a Mooney viscosity of from 30 to 50 ML1+4, and a scorch time (t10) of at least 20 minutes.

Dependencies are inferred from the claim text.