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US 4,595,517 AGranted
Composition for removing scale from a surface comprising alpha-hydroxy carboxylic acid and thickener
OwnerKhodabandeh Abadiinventor
Life of this patent
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Abstract
The present invention is directed to a composition which includes an aliphatic alpha-hydroxy carboxylic acid, a gum or polymeric thickener which is soluble in water at a pH of about 3 or less and optionally sodium silicate. The composition may be employed in removing scale from a surface.
Claims16
A descaling composition consisting essentially of
- (a) an aliphatic carboxylic acid of 2-5 carbon atoms having an alpha-substituted hydroxyl group;
- (b) a natural gum or synthetic polymeric thickener which is water soluble at a pH of 3 or below;
- (c) sodium silicate;
- and
- (d) water;
- wherein the acid is within the range of from about 5 to about 35 percent by weight of the composition, the gum or thickener is between about 0.001 and about 0.3 percent by weight of the composition;
- and the ratio by weight of sodium silicate to acid is within the range of 0 to 0.6.
4 more elements
A method for preparing a descaling composition comprising the steps of:
- (a) mixing a gum or synthetic polymeric thickener which is water soluble at a pH of about 3 or below in water to obtain a homogeneous solution;
- (b) adding sodium silicate to the homogeneous solution;
- and
- (c) dissolving an aliphatic carboxylic acid of 2-5 carbon atoms having an alpha-substituted hydroxyl group in the resulting mixture of step (b).
1 more element
A descaling composition consisting essentially of
- (a) alpha-hydroxyacetic acid;
- (b) xanthan gum;
- and
- (c) water
- wherein the acid content of the composition is about 12 to about 35 percent by weight on a water free basis;
- and the gum content is within the range of 0.25 to 0.3 percent by weight.
3 more elements
Dependencies are inferred from the claim text.