RUBBER COMPOSITION FOR CONSTRUCTION VEHICLE TIRE AND PNEUMATIC TIRE FOR CONSTRUCTION VEHICLE USING SAME

摘要

A rubber composition for a construction vehicle tire, the rubber composition blending 30 to 50 parts by mass of carbon black (A) having a nitrogen adsorption specific surface area of 90 to 130 m²/g, 5 to 20 parts by mass of carbon black (B) having a nitrogen adsorption specific surface area of 60 to 90 m²/g, 5 to 20 parts by mass of silica, and 1 to 10 parts by mass of an aromatic modified terpene resin having a softening point of 100-130 °C; in relation to 100 parts by mass of a diene-based rubber comprising 10 to 50 parts by mass of a styrene-butadiene copolymer rubber having a styrene content of 10 to 30 mass%, and 50 to 90 parts by mass of an isoprene-based rubber including a natural rubber; the total amount of filler being 70 parts by mass or less, and the blended amount of the carbon black (A) satisfying the formula 0.55 ≤ (parts by mass of the carbon black (A)/total parts by mass of the filler) ≤ 0.65.