| 主权项 |
1. Process for treating hair, characterized in that it comprises the following steps performed in this order:
(a) application of a hair straightening composition having a pH of 4 or less and comprising at one least carboxylic acid of the formula (I) and/or a hydrate thereof and/or a salt thereof onto the hair:
R—CO—COOH Formula (I) wherein R is selected from hydrogen, COOH, CN, optionally substituted C1-C10 alkyl, optionally substituted C2-C10 alkenyl, optionally substituted C2-C10 alkynyl, optionally substituted C3-C10 cycloalkyl, optionally substituted C6-C10 aryl or a 5-10-membered, optionally substituted heteroaryl group, wherein the optional substituents of the alkyl group are selected from halogen, hydroxyl, amino and C1-C4 alkoxy, and the optional substituents of the other groups are selected from halogen, hydroxyl, amino, C1-C4 alkyl and C1-C4 alkoxy, (b) leaving the composition on the hair for 1 to 120 minutes; (c) optionally rinsing off the hair; (d) drying the hair under conditions of mechanical tension and hot air flow, so that the temperature on the hair is 60-140° C.; and (e) optionally rinsing off and/or shampooing the hair. |
