Colloidal Silica Particles Process for Producing the Same and Silica Sol in Organic Solvent Silica Sol in Polymerizable Compound and Silica Sol in Dicarboxylic Anhydride Each Obtained from the Same

摘要

The invention of iron, aluminum, zinc, zirconium, titanium, tin and lead configuration in which at least one member in the average content of the polyvalent metal element M M / Si molar ratio is selected from the group of 0.001 to 0.02 5 40 to the average primary particle size of colloidal particles of silica having an outermost of said colloidal particles the content of the polyvalent metal element M present in the surface layer of the surface area of the colloidal particles 1 nm ² per 0 to 0.003 individual silica colloidal particles and their organic solvent dispersed silica sol, the polymerizable compound dispersed silica sol and the dicarboxylic acid anhydride is of the dispersed silica sol. According to the colloidal silica particles of the present invention, when dispersed in an organic compound, dispersed in an organic compound, the color or the like does not occur by the action of solid acid on its surface. In addition, decomposition of the silica may be blended in the resin according to the sol composition according to the present invention, the color or the like does not occur is also good in the dispersion stability of the dispersion medium.