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US 4,529,534 AGranted
Peroxyacid bleach compositions
AssigneeThe Procter & Gamble Company
InventorDavid L. Richardson
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Abstract
Surface active peroxyacid bleaches (e.g., perlauric acid) are protected against decomposition caused by presence of magnesium ions in aqueous solutions of said bleaches, by the presence of certain aminophosphonic acid and aminocarboxylic acid chelating agents.
Claims11
A dry granular bleaching composition comprising:
- A. from about 0.8% to about 25% of a surface active peroxyacid bleach of the formula
- R.sub.1 CO.sub.3 H
- wherein R.sub.1 is an alkyl group containing from about 7 to about 21 carbon atoms;
- and
- B. from about 0.1% to about 2% of an organic chelating agent selected from the group consisting of aminotri(methylphosphonic acid), ethylenediaminetetra(methylphosphonic acid), diethylenetriamine penta(methylphosphonic acid and the alkali metal salts thereof.
2 more elements
A method of bleaching fabrics comprising the step of contacting said fabrics at a temperature of from about 15.degree. C. to about 52.degree. C. with an aqueous solution comprising:
- A. from about 1 ppm to about 20 ppm of available oxygen from a surface active peroxyacid bleach of the formula
- R.sub.1 CO.sub.3 H
- wherein R.sub.1 is an alkyl group containing from about 7 to about 21 carbon atoms;
- and
- B. an amount of an organic chelator which is in a weight ratio of from about 0.025:1 to about 20:1 to said available oxygen, the said chelator being selected from the group consisting of aminotri(methylphosphonic acid), ethylenediaminetetra(methylphosphonic acid), diethylenetriamine penta(methylphosphonic acid and the alkali metal salts thereof.
- C. at least about 150 ppm anionic surfactant;
- D. from about 17 ppm to about 340 ppm magnesium hardness ion;
- and
- E. an amount of inorganic polyphosphate builder which is from 0.3 to about 3 times the theoretical stoichiometric equivalent of the total amount of magnesium ion and any calcium which may be present in said solution.
6 more elements
Dependencies are inferred from the claim text.