Limescale removal compositions
AssigneeThe Procter & Gamble Company
InventorsGiulia Ottavia Bianchetti, Sergio Cardola, Stefano Scialla
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Abstract
Compositions for the removal of limescale comprise aryl sulfonic acids, optionally, acid stable bleach compositions, and, optionally, sulfamic acid. The compositions are used in a process for removing limescale as aqueous compositions. The pH of the compositions is from about 0 to about 4. The compositions provide improved performance for equal reserve acidity.
Claims12
The method of removing limescale comprising application to the limescale of an effective amount of an aqueous composition consisting essentially of:
- (1) from about 1% to about 50% of arylsulfonic acid according to the formula:
- ##STR2## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are each H or SO.sub.3 H, or linear or branched C.sub.1 --C.sub.4 alkyl chain;
- or mixtures thereof;
- (2) from about 0.1% to about 25%, sulfamic acid;
- (3) 1% to about 20% by weight of the total composition of a mixture of amine oxide and quaternary ammonium compound in a ratio of 1:2 to 1:100, and
- (4) the balance water,
- said composition having a pH of from about 0 to about 2 and said pH being essentially determined by the type and amount of said arylsulfonic acid present.
An aqueous acidic composition suitable for removing limescale, which consists essentially of:
- (1) from about 1% to about 50% by weight of the total composition of arylsulfonic acid according to the formula:
- ##STR3## wherein R.sub.1, R.sub.2 , R.sub.3 , R.sub.4, R.sub.5 are each H or SO.sub.3 H, or linear or branched C.sub.1 --C.sub.4 alkyl chain;
- or mixtures thereof:
- (2) from about 0.1% to about 25%, sulfamic acid;
- (3) 1% to about 20% by weight of the total compound of a mixture of amine oxide and quaternary ammonium compound in a ratio of 1:2 to 1:100, and
- (4) the balance water,
- said composition having a pH of from about 0to about 2.
An aqueous acidic composition suitable for removing limescale, which consists essentially of:
- (1) from about 1% to about 50% by weight of the total composition of arylsulfonic acid according to the formula:
- ##STR4## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 are each H or SO.sub.3 H, or linear or branched C.sub.1 --C.sub.4 alkyl chain;
- or mixtures thereof;
- (2) sulfamic acid, in amounts of from about 0.1% to about 25% by weight of the total composition;
- (3) 1% to about 20% by weight of the total composition of a mixture of amine oxide and quaternary ammonium compound in a ratio of 1:2 to 1:100, and
- (4) the balance water,
- said composition having a pH of from about 0 to about 2 and said pH being essentially determined by the type and amount of said arylsulfonic acid present.
Dependencies are inferred from the claim text.