发明名称 |
Process of producing hydrophobic organosilica sol |
摘要 |
A process of producing a hydrophobic organosilica sol which comprises aging a reaction mixture at 0 to 100 DEG C. in the state that an alkali present in the reaction mixture is removed or is neutralized with an acid in an equivalent amount or more, thereby forming a silylation-treated silica sol having a hydrophobic colloidal silica dispersed therein, the reaction mixture comprising: (a) a hydrophilic colloidal silica having a specific surface area of 5.5 to 550 m2 /g in SiO2 concentration of 5 to 55% by weight, (b) a silylating agent of a disiloxane compound and/or monoalkoxysilane compound in a millimolar ratio of 0.03 to 2 in terms of Si atom per 100 m2 of a surface of the hydrophilic colloidal silica, and (c) a medium, as a residue thereof, comprising a mixed solvent comprising a hydrophobic organic solvent having a solubility of water of 0.1 to 12% by weight and an alcohol having 1 to 3 carbon atoms in a weight ratio of 0.05 to 20 to the hydrophobic organic solvent, and water in an amount of 15% by weight or less based on the weight of the medium.
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申请公布号 |
US6025455(A) |
申请公布日期 |
2000.02.15 |
申请号 |
US19980084092 |
申请日期 |
1998.05.26 |
申请人 |
NISSAN CHEMICALS INDUSTRIES, LTD. |
发明人 |
YOSHITAKE, KEIKO;YOKOYAMA, TAKAFUMI |
分类号 |
C01B33/145;C01B33/146;(IPC1-7):C08G77/00 |
主分类号 |
C01B33/145 |
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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