Silica base for dentifrice

Details Silica base for dentifrice Silica base for dentifrice

1987-02-19

1988-07-12

Cooper, Jack

Drug, bio-affecting and body treating compositions

Dentifrices

423335, 423339, A61K 716, C01B 3312

Patent

active

047569034

ABSTRACT:
Silica base material for dentifrice having excellent transparency, prolonged stability and desired abrasiveness, has a specific surface area of 270-500 m.sup.2 /g as measured by BET method and 5-60 m.sup.2 /g by CTAB method, gives virtually amorphous X-ray diffraction pattern after firing at 1100.degree. C., and has a refractive index of 1.455-1.470. This base material can be prepared by reacting an alkali metal silicate solution with hydrochloric acid or sulfuric acid in the presence of an electrolyte, controlling the ratio of the rate of addition of chloride ion or sulfate ion to be at least 3:2 between the acidification stage in which the pH at the completion of the reaction is brought to 3.5 or less, and the silica crystallization stage in which the pH of the reaction system if brought to 10.0, and carrying out the acidification stage within 30 minutes.

REFERENCES:
patent: 4251281 (1981-02-01), Machurat et al.
patent: 4272509 (1981-06-01), Wason
patent: 4279766 (1981-07-01), Joubert et al.

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