Colloidal antimony pentoxide powders and method of making
AssigneeNyacol Products, Inc.
InventorsDonald P. Kintz, David L. Catone
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Abstract
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.
Claims4
A colloidal antimony pentoxide powder comprising a mixture of antimony pentoxide, phosphoric acid and an ethoxylated fatty alkyl amine, wherein said powder is dispersible in a polar solvent such that at least 99.9% of the dispersion will pass through a nominal 8 micron filter.
The method of making a colloidal antimony pentoxide powder dispersible in a polar solvent comprising the steps of:
- (1) forming a phosphated sol consisting of antimony pentoxide sol and phosphoric acid;
- (2) concentrating the sol by removing water until the concentration by weight of antimony pentoxide is at least 35 percent;
- (3) adding this concentrated phosphated sol to ethoxylated fatty alkyl amine;
- and drying to provide a colloidal antimony pentoxide powder having an adsorbed moisture content of no greater than about 3.0 percent.
Dependencies are inferred from the claim text.