Patent ID: 6415833
Filing Date: 2002-07-09
Classification: B60C,Y10S

Abstract:
A pneumatic tire comprising; a tread of a cap and base structure and at least one electrically conductive rubber layer having a specific resistance of not more than 106 &OHgr;Â·cm and extending in a circumferential direction of the tread, in which the electrically conductive rubber layer has a thickness of 0.2-0.8 mm and extends inward from an outer surface of the tread in a radial direction and contacts with a tread base rubber having a specific resistance of not more than 108 &OHgr;Â·cm adjacent to an inside of a tread cap rubber having a specific resistance of more than 108 &OHgr;Â·cm; the electrically conductive rubber layer is disposed in a region corresponding to 70% of a ground contact width of a new tire and in a land portion defined between circumferential grooves located in the region so as to contact both sides of the rubber layer in a widthwise direction thereof with the tread cap rubber; and the electrically conductive rubber layer is made from a rubber composition containing 40-100 parts by weight of carbon black having a nitrogen adsorption specific surface area (N2SA) of 130-150 m2/g and a dibutyl phthalate absorption (DBP) of 110-135 ml/100 g based on 100 parts by weight of a diene rubber ingredient.