Amorphous precipitated siliceous pigments for cosmetic or dentri

Details Amorphous precipitated siliceous pigments for cosmetic or dentri Amorphous precipitated siliceous pigments for cosmetic or dentri

1975-12-22

1977-07-26

Douglas, Winston A.

Compositions: coating or plastic

Materials or ingredients

106306, 106309, 423335, 423339, C09C 130

Patent

active

040380980

ABSTRACT:
A method for producing precipitated silicic acid pigments and silicates having a unique combination of physical and chemical properties is disclosed. The pigments are produced by acidulating alkali metal silicate solutions which contain a salt or electrolyte, such as sodium sulfate, which serves to pre-polymerize the said silicate solution. Pigments produced in accordance with the invention exhibit lower wet cake moisture (or higher percent solids) and are characterized by their low structure, low oil absorption, high abrasiveness and high pack density. The products can be used as abrasive and polishing agents in dentifrice compositions, in the production of molecular sieves, in paints and the like. In a particularly advantageous embodiment, an adduct material, such as aluminum, is added to control the refractive index of the precipitated pigment.

REFERENCES:
patent: 3325249 (1967-06-01), Burke
patent: 3424602 (1969-01-01), Nauroth
patent: 3730749 (1973-05-01), Morgan

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