Bleaching agent and method for gentle oxidative lightening of keratin fibres

A method for lightening keratin fibres, wherein the method comprises:

• mixing a bleaching powder with an oxidation composition, wherein the bleaching powder comprises:
• a) at least one oxidising agent selected from sodium percarbonates, inorganic salts of a peroxysulfuric acid, or mixtures hereof,
• b) cellulose 2-[2-hydroxy-3-(trimethylammonio)propoxy]ethyl ether chloride,
• c) at least one amino acid selected from arginine, lysine, histidine, or at least one of the salts of these amino acids, and
• d) at least one complexing agent selected from the following acids and/or alkali metal salts thereof:
• ethylenediaminetetraacetic acid (EDTA);
• N-hydroxyethylethylenediaminetriacetic acid;
• aminotrimethylenephosphonic acid;
• diethylenetriaminepentaacetic acid;
• lauroyl ethylenediaminetriacetic acid;
• nitrilotriacetic acid;
• iminodisuccinic acid;
• N-2-hydroxyethyliminodiacetic acid;
• ethylene glycol-bis-(beta-aminoethyl ether)-N,N-tetraacetic acid;
• amino trimethylene phosphonic acid, pentasodium amino trimethylene phosphonate, or mixtures hereof, in a total amount of from about 0.1-about 1.4% by weight in relation to the total weight of the bleaching powder, and
• wherein the oxidation composition comprises, in each case in relation to its weight, from about 50-about 96% by weight of hydrogen peroxide, at least one pH adjustor in such an amount that the oxidation composition has a pH value in the range of from about 2.5 to about 5.5, measured at 20° C.,
• applying the mixture of the bleaching powder and the oxidation composition to the keratin comprising fibres directly after mixing, wherein the mixture is left on the fibres for from about 5 to about 60 minutes, and
• rinsing the fibres with water with the mixture optionally washed out using a surfactant-containing cleansing agent.

A multi-component packaging unit (kit-of-parts) for lightening keratin fibres, comprising at least two components packaged separately from one another, wherein i) the first component (I) is a bleaching powder comprising

• a) at least one oxidising agent selected from sodium percarbonates, inorganic salts of a peroxysulfuric acid, or mixtures hereof,
• b) cellulose 2-[2-hydroxy-3-(trimethylammonio)propoxy]ethyl ether chloride,
• c) at least one amino acid selected from arginine, lysine, histidine, or at least one of the salts of these amino acids, and
• d) at least one complexing agent selected from the following acids and/or alkali metal salts thereof:
• ethylenediaminetetraacetic acid (EDTA);
• N-hydroxyethylethylenediaminetriacetic acid;
• aminotrimethylenephosphonic acid;
• diethylenetriaminepentaacetic acid;
• lauroyl ethylenediaminetriacetic acid;
• nitrilotriacetic acid;
• iminodisuccinic acid;
• N-2-hydroxyethyliminodiacetic acid;
• ethylene glycol-bis-(beta-aminoethyl ether)-N,N-tetraacetic acid;
• amino trimethylene phosphonic acid, pentasodium amino trimethylene phosphonate, or mixtures hereof, in a total amount of from about 0.1-about 1.4% by weight in relation to the total weight of the bleaching powder,
• ii) the second component (II) is an oxidation composition which comprises, in each case in relation to its weight, from about 50-about 96% by weight of water and from about 0.5-about 20% by weight of hydrogen peroxide and has a pH value in the range of from about 2.5 to about 5.5, measured at 20° C.