| 摘要 |
<p>The invention relates to a new method of manufacturing colloidal silica which exhibits good dispersibility in an organic solvent, an organic resin, a paint containing an organic solvent or resin, or the like, is stable for a long period of time in a medium containing a hydrophobic organic solvent as a major component, and has a low metal ion impurity content under mild conditions. The new method comprises the steps of taking a colloidal silica dispersed in an aqueous dispersant; replacing a substantial amount of the aqueous dispersant with one or more hydrophilic organic colvent(s); preparing hydrophobic colloidal silica by reacting the colloidal silica with a hydrophobizing agent; and finally replacing the liquid phase of the dispersion comprising the organic hydrophilic solvent with one or more hydrophobic organic solvent(s) to obtain a hydrophobic colloidal silica dispersed in a hydrophobic organic solvent.</p> |
