Bleach compositions comprising cobalt catalysts
AssigneeThe Procter & Gamble Company
InventorsChristopher Mark Perkins, William Michael Scheper
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Abstract
Bleach compositions comprising certain carboxylate-containing cobalt catalysts are provided. More specifically, the invention relates to automatic dishwashing detergents and laundry compositions which provide enhanced cleaning/bleaching benefits (especially tea stain removal) through the selection of cobalt catalysts having the formula: Co(NH.sub.3).sub.5 M!T.sub.y wherein cobalt is in the +3 oxidation state; and M is a substituted and unsubstituted C.sub.1 -C.sub.30 carboxylate-containing ligand having the formula RC(O)O--.
Claims15
A bleaching composition comprising:
- (a) from about 0.04% to about 1% by weight of the composition of a cobalt catalyst having the formula:
- Co(NH.sub.3).sub.5 M!T.sub.y
- wherein cobalt is in the +3 oxidation state;
- M is a carboxylate-containing ligand having the formula RC(O)O--, wherein R is selected from the group consisting of hydrogen and C.sub.1 -C.sub.30 unsubstituted and substituted alkyl, C.sub.6 -C.sub.30 unsubstituted and substituted aryl, and C.sub.3 -C.sub.30 unsubstituted and substituted heteroaryl, wherein substituents are selected from the group consisting of --NR'.sub.3, --NR'.sub.4.sup.+, --C(O)OR', --OR', --C(O)NR'.sub.2, wherein R' is selected from the group consisting of hydrogen and C.sub.1 -C.sub.6 moieties, except that RC(O)O is not oxalate;
- and T is one or more counteranions present in a number y, where y is an integer to obtain a charge-balanced salt;
- (b) from about 0.1% to about 70%, by weight, of a source of hydrogen peroxide;
- and
- (c) from about 1% to about 80%, by weight, of builder.
A method for removing tea and coffee stains from hard surfaces, said method comprising treating tea-stained or coffee-stained hard surface with an aqueous alkaline bath comprising a source of hydrogen peroxide and from about 0.1 to about 50 ppm of the cobalt bleach catalyst of the formula:
- Co(NH.sub.3).sub.5 M!T.sub.y
- wherein cobalt is in the +3 oxidation state;
- M is a carboxylate-containing ligand having the formula RC(O)O--, wherein R is selected from the group consisting of hydrogen and C.sub.1 -C.sub.30 unsubstituted and substituted alkyl, C.sub.6 -C.sub.30 unsubstituted and substituted aryl, and C.sub.3 -C.sub.30 unsubstituted and substituted heteroaryl, wherein substituents are selected from the group consisting of --NR'.sub.3, --NR'.sub.4.sup.+, --C(O)OR', --OR', --C(O)NR'.sub.2, wherein R' is selected from the group consisting of hydrogen and C.sub.1 -C.sub.6 moieties, except that RC(O)O is not oxalate;
- and T is one or more counteranions present in a number y, where y is an integer to obtain a charge-balanced salt.
Dependencies are inferred from the claim text.