Precipitated silicas having improved dentifrice performance char

Details Precipitated silicas having improved dentifrice performance char Precipitated silicas having improved dentifrice performance char

1996-03-22

1999-04-06

Kulkosky, Peter F.

Drug, bio-affecting and body treating compositions

Dentifrices

4332281, 423339, A61K 716, C01B 3312

Patent

active

058914218

ABSTRACT:
Precipitated silica compositions, and methods for making the same, with improved dentifrice performance characteristics. In particular, precipitated silica compositions of the present invention have a 40% slurry viscosity build of less than approximately 20,000 centipoise and a 10% Brass Einlehner abrasion value of approximately 2.5 to 20.0 mg loss/100,000 rev. Precipitated silica compositions of the present invention also have reactor slurry average particle sizes (50%) of approximately 10 to 50 .mu.m. Methods for preparing precipitated silicas of 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 reactor contents; and (b) subjecting the reactor contents to shearing forces as the reaction proceeds.

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