Patent ID: 8137412

Claim:
Method for bleaching keratinous fibers comprising: applying a bleaching agent onto keratin-containing fibers, leaving the agent on the fibers for a time of 1 to 30 minutes, and rinsing out the agent or washing out the agent with a shampoo, wherein the bleaching agent comprises in a cosmetic carrier hydrogen peroxide, at least one cationic acyl pyridinium derivative of formula (I) wherein R is a C 1 -C 6 alkyl group, a C 2 -C 6 alkenyl group, a C 2 -C 6 hydroxyalkyl group, a C 1 -C 6 alkoxy C 2 -C 6 alkyl group, a carboxy C 1 -C 6 alkyl group, an aryl C 1 -C 6 alkyl group, a C 1 -C 6 dialkylamino C 2 -C 6 alkyl group, a heteroaryl C 1 -C 6 alkyl group, a 3-oxobutyl group, a 2-oxopropyl group, an aryl group or a heteroaryl group, R′ is a C 1 -C 4 alkyl group, a C 2 -C 6 hydroxyalkyl group or a C 1 -C 6 alkoxy C 2 -C 6 alkyl group, and X − is a physiologically acceptable anion, at least one associative polymer and at least one co-bleach activator and/or the physiologically acceptable salt thereof.