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AssigneeL'oreal
InventorsCamila BIATO, Liliane SILVESTRE
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The present invention relates to a cosmetic composition comprising at least one cationic polymer and/or one amphoteric polymer and at least 3% of one or more dicarbonyl compounds corresponding to formula (I) below and/or hydrates thereof and/or salts thereof, in which formula (I), R=H, COOH, linear or branched C1-C6 alkyl optionally substituted with an OH or COOH or Br radical; phenyl or benzyl optionally substituted with an OH or COOH radical; or alternatively an indolyl radical or formula (A). The invention also relates to a process for straightening keratin fibres, especially the hair, which comprises the application to the hair of the composition of the invention, followed by a straightening step using a straightening iron at a temperature of at least 150° C., preferably ranging from 150 to 250° C.
Cosmetic composition comprising at least one cationic polymer and/or one amphoteric polymer and at least 3% of one or more dicarbonyl compounds corresponding to formula (I) below and/or hydrates thereof and/or salts thereof:
Composition according to either of the preceding claims, in which the dicarbonyl compound(s) corresponding to formula (I) and/or hydrates thereof and/or salts thereof are chosen from glyoxylic acid and pyruvic acid, salts thereof and hydrates thereof, preferably from glyoxylic acid and the hydrate forms of this compound.
Composition according to any one of the preceding claims, characterized in that the amphoteric polymer(s) are chosen from copolymers comprising as monomers at least one monomer derived from a vinyl compound bearing a carboxylic group, such as acrylic acid, methacrylic acid, maleic acid or α-chloroacrylic acid, and at least one monomer of diallyldialkylammonium salt type, the alkyl groups containing from 1 to 6 carbon atoms, more particularly from copolymers comprising as monomers dimethyldiallylammonium chloride and acrylic acid, optionally combined with acrylamide.
Composition according to any one of the preceding claims, in which the content of cationic or amphoteric polymers ranges from 0.01% to 20% by weight and preferably from 0.1% to 10% by weight relative to the total weight of the composition.
Composition according to any one of the preceding claims, in which the weight ratio of dicarbonyl compounds corresponding to formula (I) and/or hydrate form thereof and/or salts thereof/cationic and/or amphoteric polymer(s) ranges from 1 to 50 and better still from 2 to 20.
Composition according to any one of the preceding claims, characterized in that it is aqueous and comprises water in a concentration preferably ranging from 5% to 98%, better still from 5% to 90% and even better still from 10% to 90% by weight relative to the total weight of the composition.
Composition according to any one of the preceding claims, characterized in that it has a pH of less than 4, the pH preferentially ranging from 1 to 3, better still from 1.5 to 3 and even better still from 1.7 to 3.
Composition according to any one of the preceding claims, characterized in that it results from the mixing of several compositions.
Process for straightening keratin fibres, especially the hair, which comprises the application to the hair of the composition according to any one of the preceding claims, preferably followed by a contact time ranging from 10 to 60 minutes and then a straightening step using a straightening iron at a temperature of at least 150° C., preferably ranging from 150 to 250° C.
Dependencies are inferred from the claim text.