| 摘要 |
PROBLEM TO BE SOLVED: To provide precipitated silica and a method for manufacturing the same, with respect to development of precipitated silica for use in a base structure of a tire so as to lower rolling resistance. SOLUTION: The precipitated silica has an Al<SB>2</SB>O<SB>3</SB>content of 0.2-5.0 wt.% and a wk coefficient of <3.4. The precipitated silica is manufactured by bringing an alkali metal silicate, a mineral acid and an aluminum salt solution into a reaction in an aqueous environment at 60-95°C and a pH of 7.0-10.0, continuing this reaction to a solid concentration of 40-110 g/l, adjusting the pH to 3-5, and after-treating the resulting precipitated silica by a known method. The precipitated silica can be used as a filler in a rubber blend, and particularly when the silica is used in a tire, the rolling resistance of the tire can be lowered by the easy dispersibility of the silica. COPYRIGHT: (C)2007,JPO&INPIT
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