Stabilization of anhydrous sodium metasilicate
AssigneeRhone-Poulenc Industries
InventorDaniel Joubert
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Abstract
Anhydrous sodium metasilicate is stabilized against attrition or "dusting" in detergent and other use, by formulating same with such amount of an additive, e.g., a hydrate, that will transfer water content to the anhydrous metasilicate, at a temperature less than the fusion temperature of sodium metasilicate pentahydrate and as will convert from about 1% to 20% by weight of said anhydrous metasilicate into its pentahydrate form.
Claims12
A composition of matter comprising (i) anhydrous sodium metasilicate, and (ii) a minor amount of an inorganic molecular water donor including either bound water of hydration or free water of sorption which will evolve its water content to the metasilicate (i), at a temperature less than that required for the fusion of sodium metasilicate pentahydrate (72.2.degree. C.), and as will convert from about 1% to about 20% by weight of said anhydrous metasilicate into its said pentahydrate, said water donor (ii) being selected from the group consisting of Na.sub.2 B.sub.4 O.sub.7.10H.sub.2 O, Na.sub.2 CO.sub.3. 7H.sub.2 O, Na.sub.2 HPO.sub.4.7H.sub.2 O, Na.sub.2 HPO.sub.4.12H.sub.2 O, (NaPO.sub.3).sub.3.6H.sub.2 O, Na.sub.2 SO.sub.4.10H.sub.2 O, a caustic compound and silica.
Dependencies are inferred from the claim text.