| 主权项 |
1. Process for straightening and bleaching the hair, which comprises the following steps performed in this order:
(a) application of a first composition (straightening composition) having a pH of 4 or lower and comprising at least one carboxylic acid of the formula (I) and/or a hydrate thereof and/or a salt thereof onto the hair:
R—CO—COOH (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) drying the hair, (d) optionally rinsing off the hair with water and drying the hair (e) treating the hair with an iron having a surface temperature of 130 to 250° C., preferably 180±50° C., (f) optionally rinsing and/or shampooing and drying the hair, (g) application of an aqueous second composition (bleaching composition) comprising at least one oxidizing agent and at least one alkalizing agent onto the hair, (h) leaving the composition on the hair for 5 to 45 minutes, rinsing off the composition and optionally shampooing and drying the hair,wherein steps (g) to (h) are carried out directly after steps (a) to (f). |
