Nyacol Products, Inc.

Engelhard Corporation

David L Catone

Richard A Slepetys

Donald P Kintz

Fred R Huege

Mark A Kinsman

Process for preparing an aqueous dispersion of antimony pentoxide sol useful for flame retardancy consisting of the steps forming an aqueous dispersion of phosphated antimony pentoxide sol; mixing the aqueous dispersion with a water-soluble alkanol amine; and concentrating the dispersion to provide an aqueous dispersion containing at least 50 percent by weight of antimony pentoxide; and aqueous antimony pentoxide sol dispersions prepared thereby.

Antimony pentoxide dispersions and method of making

A halogen-containing vinyl resin such as polyvinyl chloride containing a thermal stabilizer and a flame retardant reagent comprising trivalent antimony deposited as a coating on the surface of a colloidal dispersion of antimony pentoxide particles.

Stabilized and flame-retardant PVC resins

Disclosed are a novel class of colloidal antimony pentoxide powders having improved dispersibility in polar solvents; and novel processes for preparing same, which processes include the initial step of preparing a new intermediate consisting of an antimony pentoxide/phosphoric acid sol containing at least 35% by weight of antimony pentoxide based upon the total weight of the sol.

Colloidal antimony pentoxide powders and method of making

A substantially white, anhydrous, amorphous aluminosilicate pigment is obtained by calcining a combination of previously uncalcined kaolin clay and an alumina source. The calcination is carried out at a temperature of about 870.degree. C. to 1400.degree. C., preferably about 870.degree. C. to 1260.degree. C., for a suitable period of time, e.g., 0.1 to 3 hours. The pigments obtained by the foregoing method display enhanced brightness greater than the merely additive brightness which would be obtained by mixing alumina with a previously calcined kaolin clay and are otherwise well suited for use as paper-filling or coating pigments.

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Hopkinton, MA, United States of America

David L Catone