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US 10,092,490 B2Granted
Method for straightening keratinous fibres using heating means and an amide
AssigneeL'oreal
InventorsGérard Malle, Anne-Claude Dublanchet, Philippe Barbarat
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Abstract
The invention concerns a method for straightening keratinous fibers including: (i) a step of applying on the keratinous fibers a hair straightening composition containing at least one cyclic or linear amide, (ii) a step of increasing the temperature of the keratinous fibers, using heating means, to a temperature ranging between 110 and 250° C.
Claims10
A process for relaxing keratin fibers, comprising:
- applying to the keratin fibers a hair-relaxing composition comprising, as the sole hair-relaxing agent, at least one cyclic amide at a molar concentration ranging from 2 M to 8 M, wherein the pH of said composition is less than or equal to 9,
- heating the keratin fibers to a temperature ranging from 110° C. to 250° C.,
- wherein the at least one cyclic amide is chosen from:
- 2-pyrrolidone,
- pyroglutamic acid,
- 3-methyl-2-pyrrolidone,
- 5-methyl-2-pyrrolidone,
- 5-(hydroxymethyl)-2-pyrrolidinone,
- 5-aminomethylpyrrolidin-2-one,
- 4-hydroxy-2-pyrrolidinone, and
- the stereoisomers, organic or mineral salts, and/or solvates thereof;
- wherein the hair-relaxing composition does not comprise a reducing agent;
- and
- wherein the process does not comprise a reducing step.
11 more elements
A process for relaxing keratin fibers, comprising:
- applying to the keratin fibers a hair-relaxing composition comprising, as the sole hair-relaxing agent, 2-pyrrolidone or organic or mineral salts thereof, wherein the pH of said composition is less than or equal to 9, and
- heating the keratin fibers to a temperature ranging from 110 to 250° C.;
- wherein the hair-relaxing composition does not comprise a reducing agent;
- and
- wherein the process does not comprise a reducing step.
2 more elements
Dependencies are inferred from the claim text.