Detergents containing a heavy metal sequestrant and a delayed release peroxyacid bleach system
AssigneeThe Procter & Gamble Company
InventorsGerard Marcel Baillely, Janice Jeffrey, John Scott Park, Barry Stoddart
Life of this patent
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Abstract
There is a provided a detergent composition containing: (a) a heavy metal ion sequestrant; and (b) an organic peroxyacid bleaching system wherein a means is provided for delaying the release to a wash solution of said peroxyacid bleach relative to the release of said heavy metal ion sequestrant. Preferably said composition additionally contains (c) a water soluble builder wherein a means is provided for delaying the release to a wash solution of said peroxyacid bleach relative to the release of said water soluble builder. A pretreat wash method is also provided.
Claims18
A detergent composition comprising:
- (a) a heavy metal ion sequestrant;
- (b) an organic peroxyacid bleaching system comprising:
- (i) an inorganic perhydrate salt coated with a coating composition comprising organic binder and an inorganic salt selected from the group consisting of sulphates, silicates, carbonates and mixtures thereof;
- and
- (ii) an organic peroxyacid bleach precursor agglomerated with the organic binder;
- wherein the organic binder is selected from the group consisting of C.sub.10 -C.sub.20 alcohol ethoxylates, C.sub.10 -C.sub.20 monoglycerol ethers, C.sub.10 -C.sub.20 diglycerol ethers, C.sub.10 -C.sub.20 fatty acids, polyvinylpyrrolidones, polyethylene glycols, copolymers of maleic anhydride and ethylene, copolymers of maleic anhydride and methylvinyl ether, copolymers of maleic anhydride and methacrylic acid, methylcellulose, carboxymethyl cellulose, ethylhydroxyethylcellulose, hydroxyethylcellulose, homopolymeric polycarboxylic acids and salts thereof, co-polymeric polycarboxylic acids and salts thereof, and mixtures thereof;
- and
- (c) a fabric softening agent selected from the group consisting of:
- (i) from 0.5% to 5% by weight of the composition, of water-insoluble tertiary amines;
- (ii) from 0.5% to 5% by weight of the composition, of di-long chain amides;
- (iii) from 0.1% to 2% by weight of the composition, of polyethylene oxides;
- and
- (iv) mixtures thereof;
- wherein in the T50 test method the time to achieve a concentration that is 50% of the ultimate concentration of the heavy metal ion sequestrant is less than 120 seconds and the time to achieve a concentration that is 50% of the ultimate concentration of the organic peroxyacid is more than 180 seconds.
A detergent composition comprising:
- (a) a heavy metal ion sequestrant;
- (b) an organic peroxyacid bleaching system;
- and
- (c) a polyalkenyl polyether having a molecular weight of from about 750,000 to about 4,000,000;
- wherein a means is provided for delaying the release to a wash solution of said organic peroxyacid relative to the release of said heavy metal ion sequestrant such that in the T50 test method the time to achieve a concentration that is 50% of the ultimate concentration of said heavy metal ion sequestrant is at least 100 seconds less than the time to achieve a concentration that is 50% of the ultimate concentration of said organic peroxyacid;
- and wherein the composition is in the form of a gel.
A washing method comprising the steps of:
- (1) applying a bleach-free solution comprising from 0.005% to 1%, by weight, of a heavy metal ion sequestrant to a soiled substrate;
- (2) allowing said solution to remain in contact with said soiled substrate;
- and
- (3) subsequently washing said soiled substrate with a bleach-containing detergent compositions;
- wherein the heavy metal ion sequestrant is selected from the group consisting of ethylenediamine-N,N'-disuccinic acid, salts of ethylenediamine-N,N'-disuccinic acid and mixtures thereof.
Dependencies are inferred from the claim text.