Water-soluble unit-dose pouch comprising chelant

Abstract

The present invention contemplates a water-soluble unit-dose pouch, comprising at least a first compartment wherein the first compartment comprises a powder composition, and wherein the powder composition comprises an oxygen bleach source and between 2% and 20% by weight of the water-soluble unit-dose pouch of a salt of citric acid. It also contemplates methods of using the pouch in a fabric washing machine.

1 . A water-soluble unit-dose pouch comprising at least a first compartment, wherein the first compartment comprises a powder composition, and wherein the powder composition comprises an oxygen bleach source and a salt of citric acid, and wherein the salt of citric acid is present between 2% and 20% by weight of the water-soluble unit-dose pouch. 
     
     
         2 . The water-soluble unit-dose pouch of  claim 1 , wherein the salt of citric acid is present at a concentration of between 3% and 20% by weight of the water-soluble unit-dose pouch. 
     
     
         3 . The water-soluble unit-dose pouch of  claim 1  wherein the salt of citric acid is selected from the group comprising sodium citrate, calcium citrate, potassium citrate, ammonium citrate, magnesium citrate and mixtures thereof. 
     
     
         4 . The water-soluble unit-dose pouch of  claim 3 , wherein the salt of citric acid is sodium citrate. 
     
     
         5 . The water-soluble unit-dose pouch of  claim 1 , wherein the oxygen bleach source is a peroxy-based bleach source. 
     
     
         6 . The water-soluble unit-dose pouch of  claim 5 , wherein the peroxy-source is selected from the group comprising sodium percarbonate, potassium percarbonate, sodium perborate, potassium perborate, phthaloyl amino-peroxy caproic acid and mixtures thereof. 
     
     
         7 . The water-soluble unit-dose pouch of  claim 1 , wherein the powder composition comprises a bleach activator having the formula: 
       
         
           
           
               
               
           
         
       
       wherein R is an alkyl group, linear or branched, containing from about 1 to 11 carbon atoms and LG is a suitable leaving group. 
     
     
         8 . The water-soluble unit-dose pouch of  claim 7 , wherein the bleach activator has the formula: 
       
         
           
           
               
               
           
         
       
       wherein R is an alkyl chain, linear or branched, containing from 1 to 11 carbon atoms. 
     
     
         9 . The water-soluble unit-dose pouch of  claim 8 , wherein the powder composition comprises n-nonanoyloxybenzene-sulphonate. 
     
     
         10 . The water-soluble unit-dose pouch of  claim 1 , wherein the pouch comprises between 0.00001% and 1% by weight of the water-soluble unit-dose pouch of tetracetyl ethylene diamine. 
     
     
         11 . The water-soluble unit-dose pouch of  claim 1 , wherein the pouch is devoid of tetracetyl ethylene diamine. 
     
     
         12 . The water-soluble unit-dose pouch of  claim 1 , wherein the pouch is made of a pouch material, and wherein the pouch material comprises a polyvinyl alcohol polymer. 
     
     
         13 . The water-soluble unit-dose pouch of  claim 1  comprising at least a first compartment and a second compartment. 
     
     
         14 . The water-soluble unit-dose pouch of  claim 13 , wherein the second compartment comprises a liquid composition. 
     
     
         15 . A method of treating fabrics comprising the steps of;
 a. Placing fabrics in the drum of a fabric washing machine;   b. Adding a water-soluble unit-dose pouch according to any preceding claims to the drum of the fabric washing machine;   c. Washing the fabrics in the fabric washing machine.