| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a rubber composition for a tire which improves rubber hardness and compression set resistance, and reduces exothermic nature. <P>SOLUTION: The rubber composition for a tire comprises compounding 70-100 parts by weight carbon black based on 100 parts by weight of a diene based rubber which contains 40-60% by weight of a natural rubber and 40-60% by weight of a butadiene rubber, wherein in the butadiene rubber, the weight-average molecular weight is 700,000-900,000, the molecular weight distribution (Mw/Mn) calculated from the weight-average molecular weight (Mw) and the number-average molecular weight (Mn) is 1.5-3.0, the toluene solution viscosity at 25°C is 300-1,000 mPa s, and the CTAB adsorption specific surface area of the carbon black is 30-85 m<SP POS="POST">2</SP>/g. <P>COPYRIGHT: (C)2012,JPO&INPIT |
