发明名称 |
Method for preparing hydrophobic fumed silica |
摘要 |
<p>A method is disclosed for the preparation of hydrophobic fumed silicas which are useful as reinforcing fillers in rubber compositions. The method comprises a first step wherein an aqueous suspension of fumed silica is contacted with an organosilicon compound and in the presence of a catalytic amount of an acid to effect hydrophobing of said silica. In a preferred method, the first step is conducted in the presence of a water miscible organic solvent which facilitates hydrophobing of said silica with said organosilicon compound. The fumed silica used herein preferably has a BET surface area greater than 50 m<2>/g. In a second step of this method, the aqueous suspension of hydrophobic fumed silica is contacted with a water-immiscible organic solvent at a solvent to silica weight ratio greater than 0.1:1 to effect separation of a hydrophobic fumed silica from the aqueous phase. In a preferred process, the recovered hydrophobic fumed silica has a surface area within a range of 100 m<2>/g to 750 m<2>/g.</p> |
申请公布号 |
EP0928818(A2) |
申请公布日期 |
1999.07.14 |
申请号 |
EP19990100319 |
申请日期 |
1999.01.12 |
申请人 |
DOW CORNING CORPORATION |
发明人 |
GRIFFITH, PHILLIP JOSEPH;HARKNESS, BRIAN ROBERT;HERRON, WILLIAM;TAYLOR, ROSEMARY MARGARET;WILSON, DAVID JAMES |
分类号 |
C09C1/30;C01B33/18;C08K3/36;C08K9/06;(IPC1-7):C09C1/30 |
主分类号 |
C09C1/30 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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