Precipitated silicas which exhibit improved efficacy in toothpastes and methods of preparation characteristics.

摘要

DEPOSITS ARE DESCRIBED SILICA COMPOSITIONS AND PROCESSES FOR OBTAINING WITH IMPROVED FEATURES AS TO ITS PERFORMANCE AS DENTIFRICO. In particular, precipitated siliceous compositions of the present invention have a buildup of mud viscosity 40% of less than about 20,000 centipoises and Einlehner abrasion value BRASS 10% about 2.5 to 20.0mg Loss / 100,000 REV. COMPOSITIONS Precipitated silica of the present invention also have a particle AVERAGE SIZE OF SLUDGE REACTOR (50%) of about 10 to 50 MI M. PROCEDURES FOR PREPARING precipitated silicas the present invention include the steps of: a) adding sodium silicate and a mineral acid to a reactor, thereby initiating a precipitation reaction between the contents of the reactor; YB) SUBMITTING CONTENT OF REACTOR TO SHEAR FORCES OR CUTTING, as the reaction proceeds.