Patent ID: 7189267

Claim:
A method for limiting the penetration into the scalp and/or the hair of at least one dye contained in a hair dyeing composition comprising applying on the scalp and/or on the hair, as a pre-treatment, before a hair dyeing process using the hair dyeing composition, a dye penetration limiting effective amount of an antipenetrating composition comprising, in a physiologically acceptable medium, an amount higher than 5% and lower than 20% in weight of the weight based on the total volume of the composition of at least one oxyethylenated polymer selected from the group consisting of: a) polyethylene glycols with the general formula (1): H(OCH 2 CH 2 ) n OH (1) where n is higher than 45 and lower than 795, b) block polymers with ethylene oxide and propylene oxide blocks, having the formula (2): where x and z are such that at least one of x and z is higher than 75, and y is higher than 30, c) the polyethylene glycol copolymer comprising 8 successive ethylene oxide and dicyclohexylmethane diisocyanate groups having the formula (3): HO[(C 2 H 4 O) 8 —(C 15 H 24 N 2 O 2 )—(C 2 H 4 O) 8 ] x H (3) where x ranges from 1 to 4 such that the copolymer average molecular mass is 1800 g·mol −1 , and d) mixtures thereof.