Enzymatic Textile Colour Modification

Abstract

A method for adjusting the colour tone of dyed cellulosic textile fibre material comprising contacting said textile material with an enzymatic textile treatment composition comprising (i) a perhydrolase enzyme, (ii) an ester substrate for said perhydrolase enzyme, and (iii) a hydrogen peroxide source, for a length of time and under conditions suitable to permit measurable brightening of the textile material.

1 . A method for adjusting the colour tone of dyed cellulosic textile fibre material comprising contacting said textile material with an enzymatic textile treatment composition comprising
 (i) a perhydrolase enzyme,   (ii) an ester substrate for said perhydrolase enzyme, and   (iii) a hydrogen peroxide source.   
     
     
         2 . A method according to  claim 1 , wherein said perhydrolase enzyme comprises the amino acid sequence set forth in SEQ ID NO:1 or a variant or homolog thereof. 
     
     
         3 . A method according to  claim 1 , wherein said perhydrolase enzyme is the S54V variant of SEQ ID NO:1. 
     
     
         4 . A method according to  claim 1 , wherein said perhydrolase enzyme comprises a perhydrolysis to hydrolysis ratio greater than 1. 
     
     
         5 . A method according to  claim 1 , wherein said ester substrate is selected from propylene glycol diacetate, ethylene glycol diacetate, glycerol triacetate, ethyl acetate, and glycerol tributyrate. 
     
     
         6 . A method according to  claim 1 , wherein said hydrogen peroxide source is hydrogen peroxide. 
     
     
         7 . A method according to  claim 1 , wherein said enzymatic textile treatment composition additionally comprises (iv) a surfactant and/or emulsifier. 
     
     
         8 . A method according to  claim 7 , wherein said enzymatic textile treatment composition additionally comprises
 (v) a fluorescence whitening agent.   
     
     
         9 . A method according to  claim 8 , wherein said enzymatic textile treatment composition additionally comprises
 (vi) an enzymatic desizing agent.   
     
     
         10 . A method according to  claim 9 , wherein said enzymatic textile treatment composition additionally comprises
 (vii) a biopolishing agent.   
     
     
         11 . A method according to  claim 10 , wherein said enzymatic textile treatment composition additionally comprises
 (viii) a combination product.   
     
     
         12 . A method according to  claim 1 , further comprising hydrolyzing said hydrogen peroxide with a catalase enzyme after said bleached textile is produced. 
     
     
         13 . A method according to  claim 1 , wherein said method is performed in a process selected from a batch process, an exhaust process, and a discontinuous process. 
     
     
         14 . A method according to  claim 1 , wherein the textile material is contacted with the enzymatic textile treatment composition at a temperature of 60° C. to 75° C., for a processing time of 30 to 60 minutes. 
     
     
         15 . A method according to  claim 1 , wherein said dyed cellulosic textile fibre material is indigo-dyed denim.