Precipitated silica and methods thereof

Abstract

The present disclosure relates to precipitated silicas having a mean primary particle size of greater than 80 nm, a BET surface area of less than 40 m2/g, and an oil absorption of above 160 cc/100 g. The silica is produced by a process that includes (a) dispersing colloidal seed particles ranging in primary particle size from 40-100 nm, preferably 50-80 nm, in water, (b) adding an electrolyte in a concentration of 2.5-4.0 wt.-% based on the total mass added in (a), (c) heating the suspension to 65-100° C., preferably 85-95° C., (d) adding an acid and silicate while maintaining a pH of between 7.5-10, preferably 8-9, for 60-180 minutes, (e) stopping the addition of silicate, (f) adding an acid until a pH of 3-6 is reached, (g) filtering, drying, and optionally milling. The precipitated silica is used in cosmetics, anti-caking free/flow, food, carrier applications, dentifrice, and mouthwash.

Dependencies are inferred from the claim text.