Patent ID: 8523953

Claim:
A method for protecting color of artificially colored hair with respect to washing, comprising applying to the hair at least one first compound according to general structure R 1 -A-R 2 —B wherein R 1 is a saturated or unsaturated, straight or branched alkyl group with 8 to 24 C atoms, R 2 is a straight or branched alkyl group with 1 to 4 C atoms, A is a group selected from O, and B is selected from R 3 and R 4 are the same or different, H or an alkyl with 1 to 4 C atoms, hydroxyl alkyl with 1 to 4 C atoms and dihydroxyl alkyl with 2 to 4 C atoms, R 5 , and R 6 are the same or different, an alkyl with 1 to 4 C atoms, hydroxyl alkyl with 1 to 4 C atoms and dihydroxyl alkyl with 2 to 4 C atoms, R 7 is an alkyl with 1 to 4 C atoms, hydroxyl alkyl with 1 to 4 C atoms or di hydroxyl alkyl with 2 to 4 C atoms or —R 2 -A-R 1 wherein R 1 , A and R 2 have the above meaning and X is an anion selected from the group consisting of chloride, bromide, and methosulfate, for protecting colour of artificially coloured hair with respect to the washing.