Tire rubber composition for a construction vehicle and a pneumatic tire for a construction vehicle using it

摘要

Styrene Styrene content of 10 to 30 wt% - butadiene copolymer rubber 10 to 50 parts by weight, and, with respect to the diene rubber to 100 parts by mass consisting of isoprene-based rubber 90 to 50 parts by weight comprising a natural rubber , nitrogen adsorption specific surface area 90~130m ² / g 30~50 parts by weight of carbon black (a) is, nitrogen adsorption specific surface area 60~90m ² / 5-20 parts by weight of carbon black (B) is g, silica 5-20 parts by weight, the softening point is blended from 1 to 10 parts by weight of an aromatic modified terpene resin is 100~130 , the total amount of the filler there are more than 70 parts by mass, and carbon black (a) of the amount construction vehicle tire rubber composition satisfying the following equation. 0.55 (total mass of the parts by weight / the filler of the carbon black (A)) 0.65