| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a rubber masterbatch which is used as a rubber composition capable of improving low heat generation performance of vulcanized rubber while improving the processability of the rubber composition.SOLUTION: A rubber masterbatch is produced by simultaneously mixing and dispersing 0.1-0.5 pt.mass of a peptizer, 0.1-5.0 pts.mass of a dihydrazide compound, and 10-35 pts.mass of a carbon black into 100 pts.mass of a diene rubber. A rubber composition for a tire tread is produced by performing a step II of mixing and dispersing compounding agents other than a vulcanized compounding agent into the rubber masterbatch, and a step III of further mixing and dispersing a vulcanized compounding agent thereinto after the step II. |
