Patent ID: 11958980
Assignee: RHODIA OPERATIONS
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 20:
21. A process for preparing the precipitated silica of claim 1, which comprises:
(i) providing a starting solution comprising a total amount of at least one alkali metal alkyl siliconate, at least a portion of a total amount of a silicate involved in a precipitation reaction and optionally an electrolyte, the concentration of the silicate in the starting solution being less than 100 g/L;
(ii) adding an amount of an acid to said starting solution to obtain a reaction medium having a pH value of at least 7.0; and
(iii) further adding an acid and, if appropriate, simultaneously the remaining portion of silicate to the reaction medium to obtain a silica suspension.