A METHOD FOR THE PREPARATION OF PRECIPITATED SILICAS IN POWDER FORM SUITABLE FOR USE IN DENTAL PREPARATIONS SUCH AS TRANSPARENT/TRANSLUCENT TOOTHPASTES

摘要

A method for the preparation of precipitated silica in powder form suitable for use in dental preparations such as transparent/translucent toothpastes, in which. l)  sodium silicate solution is destabilised with acid as herein described under rapid agitation at a pH above 9, ii)  the precipitate thus obtained is washed with acid as hereinbefore  described to remove iron. Ill)  acid is removed from the silica precipitate by washing in a known manner, and Iv)  the precipitate is dried to a powder.