Dishwashing method
AssigneeThe Procter & Gamble Company
InventorsNathalie Sophie LETZELTER, Alexander Charles HOLLINGSWORTH, Fernando SOLACHE LEON, Victoria WRAY, Neil BRADLEY
Life of this patent
Estimating the term…
Abstract
An automatic dishwashing liquor comprising: a) from about 0.5 to about 10 ppm of orthophosphate expressed as elementary phosphorous; b) from about 40 to about 600 ppm of a first polymer comprising: i) carboxylic acid monomers; ii) monomers comprising a sulfonic acid group wherein the monomers comprising a sulfonic acid group represent more than 10% of the polymer on a molar basis; c) from about 15 to about 150 ppm of a phosphonate; d) a bleach system comprising bleach and a bleach catalyst; and e) less than 30 ppm of polyphosphate.
Claims15
An automatic dishwashing liquor comprising:
- a) from about 0.5 to about 10 ppm of orthophosphate expressed as elementary phosphorous;
- b) from about 40 to about 600 ppm of a first polymer comprising:
- i) carboxylic acid monomers;
- ii) monomers comprising a sulfonic acid group wherein the monomers comprising a sulfonic acid group represent more than 10% of the polymer on a molar basis;
- c) from about 15 to about 150 ppm of a phosphonate;
- d) a bleach system comprising bleach and a bleach catalyst;
- and
- e) less than 30 ppm of polyphosphate.
An automatic dishwashing liquor according to any proceeding claim wherein the phosphonate is 1-hydroxyethane-1,1-diphosphonic acid and/or the salts thereof.
An automatic dishwashing liquor according to any proceeding claim wherein the bleach is an oxygen bleach and the bleach catalyst is a manganese compound.
An automatic dishwashing liquor according to the preceding claim wherein the bleach catalyst is a complex of manganese with 1,4,7-trimethyl-1,4,7-triazacyclo-nonane or manganese (II) acetate tetrahydrate.
An automatic dishwashing liquor according to any proceeding claim further comprising carbonate.
An automatic dishwashing liquor according to any proceeding claim further comprising a non-phosphate builder selected from citric acid, MGDA (methyl-glycine-diacetic acid), GLDA (glutamic-N,N-diacetic acid) and mixtures thereof.
An automatic dishwashing liquor according to any proceeding claim further comprising a protease and an amylase.
An automatic dishwashing liquor according to any proceeding claim further comprising a non-ionic surfactant system.
An automatic dishwashing liquor according to any proceeding claim further comprising a zinc salt.
An automatic dishwashing liquor according to any proceeding claim further comprising a second polymer comprising:
- i) carboxylic acid monomers;
- ii) monomers comprising a sulfonic acid group;
- wherein the monomers comprising a sulfonic acid group represent 10% or less on a molar basis of the polymer.
A method of washing a dishwashing load in an automatic dishwasher in the presence of orthophosphate, the method comprising the steps of subjecting the load to a dishwashing liquor according to any of the proceeding claims.
A method of washing a dishwashing load in an automatic dishwasher in the presence of orthophosphate, the method comprising the steps of:
- 1) subjecting the load to wash water comprising from about 0.5 to about 20 ppm of orthophosphate expressed as elementary phosphorous;
- and
- 2) providing from about 10 g to about 10 g of an automatic dishwashing composition comprising:
- a) from about 1 to about 15% by weight of the composition of a first polymer comprising:
- i) carboxylic acid monomers;
- ii) monomers comprising a sulfonic acid group;
- wherein the monomers comprising a sulfonic acid group represent more than 10% of the polymer on a molar basis;
- b) from about 0.5 to about 5% by weight of the composition of a phosphonate;
- c) a bleach system comprising bleach and a bleach catalyst;
- and
- d) less than 1% of polyphosphate.
Dependencies are inferred from the claim text.