| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface-modified silica having improved dispersibility in rubber and improved bonding property to rubber molecules, and a rubber composition produced by using the silica and exhibiting the merits of silica such as reinforcing property, low heat generation and high abrasion resistance which are unattainable by conventional silica compounding method. SOLUTION: A mixture of an isocyanate and a polyhydric alcohol or an amine or a low-molecular compound containing≥2 epoxy groups in the molecule and having a number-average molecular weight of≤1,000 is impregnated in fine pores on the surface of silica particles, polymerization reaction is started by heat or light to polymerize the mixture or the low-molecular compound to a polymer having a number-average molecular weight of≥3,000 by ring-opening polymerization or a condensation polymerization and obtain a surface-modified silica having a polymer coating layer on the surface of the silica particle. The rubber composition contains 20-100 pts.wt. of the surface-modified silica based on 100 pts.wt. of a diene rubber component. COPYRIGHT: (C)2007,JPO&INPIT
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