Bleach compositions comprising manganese-containing bleach catalysts
AssigneeThe Procter & Gamble Company
InventorsGerard Marcel Abel Baillely, Richard Timothy Hartshorn, Thomas Edward Cook, Alistair John Pretty, Christian Leo Marie Vermote
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Abstract
Bleaching compositions useful for laundering fabrics comprising a manganese bleach catalyst at a level below about 40 ppm manganese sourced by the catalyst. Also, acid wash methods useful for reducing the bleach catalyst carry-over from laundry bleach compositions containing metal-containing bleach catalysts, said methods comprising contacting fabrics impregnated with metal-containing bleach catalysts with an aqueous acidic solution having a pH below about 4.0.
Claims10
A method for reducing the bleach catalyst carry-over from laundry bleach compositions containing manganese-containing bleach catalyst;
- said composition having less than about 40 ppm manganese sourced by the catalyst;
- said method comprising contacting fabrics impregnated with manganese-containing bleach catalysts with an aqueous solution having a pH below about 4.0.
A method for reducing the carry-over of the metal sourced by the bleach catalyst from laundry bleach compositions containing the metal-containing bleach catalyst Mn.sup.IV.sub.2 (u-O).sub.3 (1,4,7-trimethyl-1,4,7-triazacyclononane).sub.2 (PF.sub.6).sub.2, said method comprising contacting fabrics impregnated with the metal-containing bleach catalyst Mn.sup.IV.sub.2 (u-O).sub.3 (1,4,7-trimethyl-1,4,7-triazacyclononane).sub.2 (PF.sub.6).sub.2 or manganese-containing decomposition products thereof with an aqueous acidic solution having a pH below about 4.0.
A method for bleaching fabrics, said method comprising the steps of:
- (a) washing one or more times fabrics in need of bleaching with laundry bleaching compositions comprising:
- (i) a peroxy compound present in an effective amount to cause bleaching;
- and (ii) less than about 40 ppm manganese sourced by the catalyst of a manganese-containing bleach catalyst present to activate the peroxy compound;
- followed by;
- (b) contacting the fabrics from step (a) with an aqueous solution having a pH below about 4.0;
- optionally followed thereafter by;
- (c) washing the fabric from step (b) in an alkaline, catalyst-free laundry detergent composition.
Dependencies are inferred from the claim text.