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US 4,612,138 AGranted
Stable acidic and alkaline metal oxide sols
AssigneeNalco Chemical Company
InventorBruce A. Keiser
Life of this patent
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Abstract
A stable acidic and alkaline metal oxide sol is formed by hydrolyzing a metal salt precursor in the presence of a stabilizing component chosen from the group consisting of surfactants having an HLB of at least 8, dispersing carboxylate polymers, and mixtures thereof, then alkalizing by adding a water-soluble amine compound, preferably diethylaminoethanol.
Claims11
A stable alkaline metal oxide sol having a pH of at least 8.0 containing from 1-50 weight percent M.sub.x O.sub.y, wherein:
- M is chosen from the group consisting of alkaline earth metals and transition metals;
- x is from 1-3;
- y is from 1-6;
- and
- a water-soluble stabilizing component chosen from the group consisting of water-soluble surfactants having an HLB greater than about 8.0, water-soluble dispersing carboxylate polymers and mixtures thereof, with the ratio of metal oxide to stabilizing component being within the range of 0.25:1 to about 20:1 and the pH of the alkaline metal oxide sol being produced by a water-soluble amine.
2 more elements
Dependencies are inferred from the claim text.