摘要:
A colloidal silica comprising, silica particles inside of which or on the surface of which a nitrogen containing alkaline compound is fixed, wherein said silica particles are prepared by forming and growing colloid particles using the nitrogen containing alkaline compound. Said colloidal silica can be prepared by preparing active silicic acid aqueous solution contacting silicate alkali aqueous solution with cation exchange resin, adding the nitrogen containing alkaline compound and heating, and then growing up particles by build-up method.
摘要:
Colloidal silica forming nonspherical particles cluster, whose long axis/short axis ratio of silica particles is of 1.2 to 20, and average long axis/short axis ratio of 3 to 15. This colloidal silica can be produced by forming particles by adding basic nitrogen compounds to an active silicic acid aqueous solution, the solution which produced by hydrolysis of tetraalkoxysilane, while heating, then growing particles by using a build up method.