Composition for the permanent shaping of human hair
The present invention concerns a composition for the permanent shaping of human hair comprising a copolymer of vinylpyrrolidone and quaternized vinylimidazole at a concentration in the range of 0.1 to 2.5% by weight calculated to total composition and process for permanent shaping human hair with the said compositions.
1. Composition for the curling of human hair, comprising at least one reducing agent at a concentration of above 2% by weight, calculated to total composition, and a copolymer of vinylpyrrolidone, present at 5% by weight of the total copolymer, and quaternized vinylimidazole, present at 95% by weight of the total copolymer, at a concentration in the range of 0.1 to 2.5% by weight calculated to total composition, wherein the copolymer has a cationic charge density of at least 6.1 meq/g at pH 7.0 and a molecular weight, by light scattering method, of 40,000.
2. Composition according to claim 1 , wherein the reducing agents are selected from thioglycolic acid, thiolactic acid and its salts, cystein and its hydrochloride salt and acetylcystein.
3. Composition according to claim 1 , wherein it has a Brookfield viscosity of 500 to 10,000 mPa·s at 20° C.
4. Composition according to claim 1 , further comprising at least one surfactant selected from anionic, nonionic and amphoteric ones at a concentration of 0.05 to 10% by weight, calculated to total composition.
5. Composition according to claim 1 , further comprising at least one organic solvent at a concentration of 0.1 to 10% by weight, calculated to total composition.
6. Composition according to claim 1 , further comprising at least one ubichinone of the formula
where n is a number between 1 and 10.
7. Composition according to claim 1 , further comprising aminated silicone at a concentration of 0.05 to 2.5% by weight, calculated to total composition.
8. Composition according to claim 1 , wherein it has a pH in the range of 6.5 to 10.5.
9. Composition according to claim 1 , further comprising at least one cationic surfactant.
10. Process for permanent waving of hair, comprising the steps of, in order:
washing or shampooing hair first and then winding the hair on curlers and
applying on to the hair the composition according to claim 1 onto the hair,
at the end of the 1 to 45 min of processing time, rinsing off the composition from the hair with tap water,
applying onto the hair an oxidizing composition comprising at least one oxidizing agent, at a concentration of 0.5 to 10% by weight calculated to total of oxidizing composition,
leaving the oxidizing composition on the hair 1 to 20 min
rinsing off the oxidizing composition from the hair and
removing the curlers from the hair.
11. Process according to claim 10 wherein after rinsing off the composition according to claim 1 from the hair, an intermediate treatment composition optionally comprising a copolymer of vinylpyrrolidone and quaternized vinylimidazole at a concentration in the range of 0.1 to 2.5% by weight calculated to total composition is applied onto hair and without rinsing off and after removal of the excess amount with towel, the oxidizing composition is applied and at the end of the processing they are rinsed off from hair.
12. Process for straightening hair wherein hair is washed and/or shampooed and dried and reducing composition according to claim 1 is applied onto dry hair and processed for 5 to 60 min and rinsed off with water and dried and the dry hair physically straighten with hot iron at a temperature of 130 to 210° C. and subsequently an oxidizing composition comprising at least one oxidizing agent at a concentration of 0.5 to 10% by weight calculated to total of oxidizing composition, is applied onto hair and left on the hair 1 to 20 min and rinsed off.