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US 4,033,718 AGranted
Photoactivated bleaching process
AssigneeThe Procter & Gamble Company
InventorsThomas Charles Holcombe, Robert Howard Schultz
Life of this patent
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Abstract
Detergent compositions containing particular species of sulfonated zinc phthalocyanine were found to be unexpectedly effective bleach photoactivators for removing stains from textiles. These species are principally tri- and tetra-sulfonates, especially the latter, with minor amounts of di-sulfonates permitted.
Claims8
A process for removing stains from textiles which comprises treating the textiles, in the presence of visible light and oxygen, with an aqueous solution containing:
- (a) a concentration of from 78 milligrams per liter to 1,440 milligrams per liter of an anionic surfactant;
- (b) a concentration of from 215 milligrams per liter to 2,140 milligrams per liter of an alkaline builder salt;
- and
- (c) a concentration of from 0.25 milligrams per liter to 125 milligrams per liter of a bleach photoactivator which is a mixture of sulfonated zinc phthalocyanine species in which the relative densitometer values (RDV's) of the various sulfonated zinc phthalocyanine species in the mixture are:
- ______________________________________ Specie RDV ______________________________________ unsulfonated 0 monosulfonated 0 disulfonated 0-15 trisulfonated plus tetrasulfonated (100)-(RDV for disulfonated) ______________________________________
2 more elements
Dependencies are inferred from the claim text.