| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a rubber composition for tires, capable of obtaining pneumatic tires with improved fuel economy performance, and to provide a method for producing the rubber composition, sufficiently reducing the unreacted percentage of a silane coupling agent without the need of any new plant and equipment investment and without causing the decline in its own productivity. <P>SOLUTION: The rubber composition for tires is such as to include: 5-100 mass% of a terminal-modified styrene-butadiene rubber of a molecular weight distribution of 2.3 or less; and/or 10-60 pts.mass of a tin-modified polybutadiene rubber of a molecular weight distribution of 2.0 or less, in 100 pts.mass of a feedstock rubber. The method for producing this rubber composition is also provided, comprising: a kneading step of kneading such a rubber material that 100 pts.mass of the feedstock rubber and 5-150 pts.mass of silica have been compounded together, with a silane coupling agent, using a hermetic kneader; and a holding step of holding rubber mass obtained by the kneading, for a defined period of time in a high-temperature atmosphere beneath the hermetic kneader to feed the rubber mass with a quantity of heat necessary for reaction between the silica and the silane coupling agent. <P>COPYRIGHT: (C)2012,JPO&INPIT |
