Rubber composition for tire tread

Abstract

The present invention provides a rubber composition used for a tire tread excellent in abrasion resistance under a high severity abrasion condition and a low severity abrasion condition, while keeping low exothermic property and rubber crack resistance. The rubber composition for a tire tread, comprising a rubber component containing 5 to 40 % by weight of a butadiene rubber having 110 to 150 cps of a toluene solution viscosity and 3.0 to 3.4 of a molecular weight distribution, wherein a Mooney viscosity of the rubber composition (MS 1+4 / 130 DEG C) is 45 to 70, is provided.

Description

technical field [0001] The invention relates to a rubber mixture for tire treads. Background technique [0002] In general, for heavy-duty large-size radial tires (truck and bus radial tires: TBR) for delivery trucks and buses, emphasis on wear resistance is the most important, and therefore research on rubber compositions expected to improve tire life has been initiated. Usually, in the tread rubber composition in contact with the road surface, based on 100 parts by weight of the rubber component, the rubber composition used is mixed with natural rubber as the main component and 40 to 60 parts by weight of carbon black . [0003] There are two types of wear resistance, namely wear resistance under high-intensity friction conditions and wear resistance under low-intensity friction conditions. The high-intensity friction condition here refers to the situation where the sliding between the tire and the road surface occurs frequently due to sta...