| 主权项 |
1. A method for manufacturing a rubber composition comprising:
an operation in which
a wet master batch comprising a first carbon black and a first rubber comprising natural rubber and/or polyisoprene rubber,a second rubber comprising styrene-butadiene rubber, anda second carbon black are dry-blended together under conditions satisfying both Formula I, below, and Formula II, below; wherein, at the aforementioned operation, the styene-butadiene rubber is present in an amount that is not less than 10 parts by mass for every 100 parts by mass of the first rubber and the second rubber combined; wherein, at the aforementioned operation, the first rubber is present in an amount that is not less than 20 parts by mass for every 100 parts by mass of the first rubber and the second rubber combined; wherein Formula I is 0.40≦A/C≦1.20; wherein, at Formula I, A indicates amount of the first carbon black for every 100 parts by mass of the first rubber, and C indicates combined amount of the first carbon black and the second carbon black for every 100 parts by mass of the first rubber and the second rubber combined; wherein Formula II is 0.80≦(B/D)×100/C≦1.30; and wherein, at Formula II, B indicates amount of the second carbon black for every 100 parts by mass of the first rubber and the second rubber combined, and D indicates amount of the second rubber for every 100 parts by mass of the first rubber and the second rubber combined. |
