| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a rubber composition for tires, the heat generation properties and wet grip performance of which are made equal to or better than the conventional levels even when silica is blended therein. <P>SOLUTION: The rubber composition for tires is prepared by blending 5-18 pts.wt of carbon black and silica based on 100 pts.wt of diene rubber, so that the total of the silica and the carbon black becomes 70-110 pts.wt. The carbon black has 60-140 m<SP POS="POST">2</SP>/g CTAB adsorption specific surface area and 100-150 ml/100g DBP absorption number and satisfies relationships: 1.55<D75/D25<2.0 and CA<0.35×DBP+2.0 (wherein D25 and D75 are a 25% frequency value and a 75% frequency value in an aggregate measured in a centrifugal precipitation method, respectively; DBP is the DBP adsorption number; CA is a shape coefficient which is calculated by analyzing a two-dimensional projection image of the aggregate picked-up by a transmission electron microscope and using the expression: CA=(S-A)/A×100 (wherein S is an envelop area; A is a projected area)). <P>COPYRIGHT: (C)2013,JPO&INPIT |
