Patent ID: 6119705
Filing Date: 2000-09-19
Classification: C11D

Abstract:
A method of washing tableware in a domestic automatic dishwashing appliance, said method comprising treating the soiled tableware in an automatic dishwasher with an aqueous alkaline bath comprising a source of hydrogen peroxide and a cobalt catalyst having the formula:[Co.sub.n L.sub.m X.sub.p ].sup.z Y.sub.zwherein n is an integer from 1 to 4; m is an integer from 1 to 12; p is an integer from 0 to 8; Y is a counterion selected dependent on the charge z of the complex; X is a coordinating species selected from the group consisting of Cl.sup.-, Br.sup.-, I.sup.-, F.sup.-, NCS.sup.-, I.sub.3, .sup.- OH, O.sub.2.sup.2-, O.sup.2-, HOO.sup.-, H.sub.2 O, SH, CN.sup.-, OCN.sup.-, S.sub.4.sup.2-, NH.sub.3, NR.sub.3, RCOO.sup.-, RO.sup.- ; ##STR8## RSO.sub.3.sup.- and RSO.sub.4.sup.- in which R is selected from hydrogen, substituted and unsubstituted alkyl, substituted and unsubstituted aryl, and R'COO.sup.- where R' is selected from substituted and unsubstituted alkyl and substituted and unsubstituted aryl, and mixtures thereof; and L is an organic ligand molecule having the general formula ##STR9## wherein R.sup.1 and R.sup.2 can each be zero, H, substituted and unsubstituted alkyl, substituted and unsubstituted aryl; each D can be independently N, NR, PR, O, S, wherein R is H, substituted or unsubstituted alkyl, and substituted or unsubstituted aryl; t and t' are each independently 2 or 3, and s=2, 3, 4, or 5.