Processes to Pre-Treat Hair with Organic Solvents

Abstract

The present invention discloses methods and kit-of-parts for treating keratinous fibres prior to dyeing to control and modulate dye uptake into the fibre. Organic solvents having log P of from −4.0 to −0.5 or from 0.5 to 4.0 are used to manufacture pre-treatment composition to be applied to the hair. When the hair is pre-treated with at least one organic solvent having a log P of from 0.5 to 4.0 the dye penetration into the keratinous fibres is enhanced, while pre-treating the hair with at least one organic solvent having a log P of from −4.0 to −0.5 reduces the dye uptake. One or more compositions to pre-treat the keratinous fibres can be effortlessly applied on different zones of the hair and can be left in place or removed prior the application of the dyeing composition.

1 . A method for treating hair comprising the steps of
 a) contacting the hair with a pre-treatment composition comprising at least one organic solvent selected from the group consisting of glycerine, diethyleneglycol, dipropylene glycol and mixtures thereof, wherein said organic solvent is present in said pre-treatment composition at a level of from about 10% to about 100% by weight of the pre-treatment composition, and then   b) applying a hair dyeing composition to the hair.   
   
   
       2 . The method according to  claim 1 , wherein said at least one organic solvent is present in said pre-treatment composition at a level of from about 15% to about 100% by weight of the pre-treatment composition. 
   
   
       3 . The method according to  claim 1 , wherein said at least one organic solvent is present in said pre-treatment composition at a level of from about 25% to about 100% by weight of the pre-treatment composition. 
   
   
       4 . The method according to  claim 1 , wherein said at least one organic solvent is present in said pre-treatment composition at a level of from about 50% to about 98.99% by weight of the pre-treatment composition. 
   
   
       5 . The method according to  claim 1 , wherein said pre-treatment composition applied in step a) is either left in place on the hair or is rinsed off the hair before step b). 
   
   
       6 . The method according to  claim 1 , wherein said pre-treatment composition applied in step a) is left in place on the hair before step b). 
   
   
       7 . The method according to  claim 1 , wherein the pre-treatment composition is left on the hair for from about 1 to about 60 minutes. 
   
   
       8 . A kit comprising:
 c) an individually packaged pre-treatment composition comprising at least one organic solvent selected from the group consisting of glycerine, diethyleneglycol, dipropylene glycol and mixtures thereof, wherein said organic solvent is present in said pre-treatment composition at a level of from about 10% to about 100% by weight of the individually packaged pre-treatment composition, and   d) an individually packaged composition comprising at least one oxidative dye precursor, and   e) an individually packaged composition comprising at least one oxidizing agent.   
   
   
       9 . The kit according to  claim 8 , wherein the organic solvent is present in said pre-treatment composition at a level of from about 15% to about 100% by weight of the individually packaged pre-treatment composition. 
   
   
       10 . The kit according to  claim 8 , wherein the organic solvent is present in said pre-treatment composition at a level of from about 25% to about 100% by weight of the individually packaged pre-treatment composition. 
   
   
       11 . The kit according to  claim 8 , wherein the organic solvent is present in said pre-treatment composition at a level of from about 50% to about 98.99% by weight of the individually packaged pre-treatment composition.