Pq Corporation

Philadelphia Quartz Company

M Robert Derolf

Elliot P Hertzenberg

Reinhard H Witt

Kenneth A Berg

Anthony L Dent

Eleftherios P Katsanis

Beer processing and composition

Silicas that provide improved abrasive action when incorporated in dentifrice compositions can be prepared by dehydrating a silica hydrogel to a low water content and then reintroducing water to gel. The silica hydrogel is prepared by neutralizing a sodium silicate with an acid. This hydrogel is dried by any convenient method so that the gel contains about 15% water or less. This dried gel is rehydrated to about 30% or more. The rehydrated gel provides improved abrasion values over the prior art xerogels and hydrogels.

Rehydrated silica gel dentifrice abrasive

A binder system useful in formulating coatings for glass, metal, wood and especially light diffusive coatings for glass light bulb envelopes is disclosed. Excellent coatings can be formed using a binder system comprising dispersible colloidal particles of alumina and finely divided, precipitated silica. When a stable dispersion of these two materials is combined properly with a pigment and/or filler system and then dried upon a glass, metal or wood surface, a tough, continuous, tightly adhering coating is formed. By using the correct pigments, a light diffusive coating for light bulb envelopes can be formed.

Alumina-silica binder for coating compositions

Dispersible colloidal particles of .alpha. alumina monohydrate are prepared by conditioning aqueous solutions of an aluminum salt with an organic solvent and the precipitating alumina with an aqueous solution of base. The reaction mixture is heated under pressure, filtered, washed and dried to obtain the product.

Precipitating .alpha. alumina monohydrate

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Pottstown, PA, United States of America

M Robert Derolf