Detergent Composition
The present invention relates to a detergent composition comprising at least one surfactant, at least one biodegradable builder and, at least one source of metal ions, wherein the metal ions are selected from zinc; tin; magnesium; calcium; strontium; titanium; zirconium; manganese; and/or bismuth. The composition is especially suitable for use as a dishwasher detergent composition. The present invention also relates to methods for using such a composition as well as methods of washing dishes with the composition.
1 . A detergent composition comprising:
(i) at least one surfactant,
(ii) at least one biodegradable builder and,
(iii) at least one source of metal ions, wherein the metal ions are selected from zinc; tin; magnesium; calcium; strontium; titanium; zirconium; manganese; and/or bismuth.
2 . A detergent composition according claim 1 , wherein the at least one surfactant is chosen from nonionic surfactants, cationic surfactants and amphoteric surfactants and mixtures thereof.
3 . A detergent composition according to claim 1 , wherein the biodegradable builder is present in an amount of from 30-70 wt %.
4 . A detergent composition according to claim 1 , wherein the biodegradable builder comprises a monomeric polycarboxylic acid salt or a hydroxycarboxylic acid salt.
5 . A detergent composition according to claim 4 , wherein the polycarboxylic acid or hydroxypolycarboxylic acid has 2-8 carboxyl groups.
6 . A detergent composition according to claim 4 , wherein the biodegradable builder comprises citric acid and/or citrate.
7 . A detergent composition according to claim 4 , wherein the salt(s) are selected from ammonium and/or alkaline metal salts.
8 . A detergent composition according to claim 1 , comprising two or more of the sources of metal ions.
9 . A detergent composition according to claim 8 , wherein the sources of metal ions comprises at least one source of zinc ions and at least one source of bismuth ions.
10 . A detergent composition according to claim 9 , wherein the weight ratio of zinc ions to bismuth ions is in the range from 1:100 to 100:1.
11 . A detergent composition according to claim 1 , wherein the metal ions obtained from the source of metal ions are present in the composition in an amount of from 0.001 to 1% wt based on the total weight of the composition.
12 . A detergent composition according to claim 11 , wherein the metal ions obtained from the source of metal ions are present in the composition in an amount of from 0.01 to 0.5% wt.
13 . A detergent composition according to claim 1 , wherein the at least one source of metal ions is present in metallic form, as a compound or as a salt.
14 . A detergent composition according to claim 1 , wherein the composition further comprises at least one polymer.
15 . A detergent composition according to claim 14 , wherein the at least one polymer is biodegradable.
16 . A detergent composition according to claim 14 , wherein the polymer comprises a sulfonated polymer or copolymer which includes, as a or the monomer unit, a compound of formula;
CH 2 ═CR 1 —CR 2 R 3 —O—C 4 H 3 R 4 —SO 3 X
wherein R 1 , R 2 , R 3 , R 4 are independently 1 to 6 carbon alkyl or hydrogen, and X is hydrogen or alkaline metal.
17 . A detergent composition according to claim 16 , wherein the sulfonated polymer, includes, as a or the monomer unit, 2-acrylamido-2-methyl-1-propanesulfonic acid.
18 . A detergent composition according to claim 14 , wherein the polymer is present in an amount of from 2 wt % to 40 wt %.
19 . A detergent composition according to claim 1 , wherein the composition further comprises 0.01 to 3 wt % of one or more enzymes.
20 . A detergent composition according to claim 1 , wherein the composition is substantially free of phosphorous-containing compounds.
21 . A detergent composition according to claim 1 , wherein the composition further comprises from 1 wt % to 30 wt % of a bleach component selected from inorganic peroxy-compounds and organic peracids and salts derived therefrom.
22 . A detergent composition according to claim 21 , which further comprises a carbonate or a source of carbonate.
23 . A detergent composition according to claim 22 , which yields an alkaline washing medium when contacted with water.
24 . (canceled)
25 . A method for washing kitchenware in an automatic dishwashing machine wherein a detergent composition according to claim 1 is added to the automatic dishwashing machine.
26 . A method according to claim 25 , wherein the water provided to the automatic dishwashing machine has a hardness of at least 10° German hardness.