02-03-2017 дата публикации
Номер: US20170058110A1
[PROBLEM] To provide a method for manufacturing a rubber composition that will serve as raw material for vulcanized rubber which excels in tear resistance, wet performance, and ability to achieve reduced heat generation. 1. A method for manufacturing a rubber composition comprising: 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, and', 'a second carbon black, 'an operation in which'}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; andwherein, 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.2. A method for manufacturing a rubber composition according to wherein the styrene-butadiene rubber has a glass transition temperature that is −60° C. to 0° C.3. A method for manufacturing a tire comprising the method for manufacturing the rubber composition according to . The present invention relates to a rubber composition ...
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