RUBBER COMPOSITION FOR HEAVY DUTY TIRE AND PNEUMATIC TIRE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a rubber composition for a heavy duty tire which, when formed into a tire, is excellent in low heat build-up properties and wear resistance and increases elongation at break, and to provide a pneumatic tire using the same.SOLUTION: The rubber composition for a heavy duty tire contains a diene rubber (A), carbon black (B), and an acid-modified polyolefin (C). The diene rubber (A) contains 70 mass% or more of a natural rubber. The carbon black (B) has a nitrogen adsorption specific surface area of 100-160 m/g. The acid-modified polyolefin (C) has a melt mass flow rate of 100 g/10 min or more. The content of the carbon black (B) is 30 pts.mass or more and less than 70 pts.mass based on 100 pts.mass of the diene rubber (A). The content of the acid-modified polyolefin (C) is 0.1-10 pts.mass based on 100 pts.mass of the diene rubber (A).SELECTED DRAWING: None