Process for treating straightened keratin fibres
The present invention relates to a process for treating straightened keratin fibers, in which a composition comprising at least one carboxylic acid in its acid or salified form, the pH being greater than 8, is applied to the straightened keratin fibers.
1. A process for treating straightened keratin fibers, said process comprising a step of:
applying to the straightened keratin fibers a composition comprising at least one carboxylic acid in its acid or salified form in an amount ranging from 1% to 50%, wherein the molecular weight of the carboxylic acid is lower than 250,
wherein the pH of the composition is greater than about 8.
2. The process according to claim 1 , wherein the composition comprises at least one carboxylic acid chosen from tricarboxylic acids or salts thereof, dicarboxylic acids or salts thereof, amino dicarboxylic acids or salts thereof, monocarboxylic acids or salts thereof, α-hydroxylated carboxylic acids or salts thereof, and dihydroxylated carboxylic acids or salts thereof.
3. The process according to claim 1 , wherein the composition comprises at least one carboxylic acid or one carboxylic acid salt chosen from citric acid, sodium citrate, maleic acid, sodium maleate, succinic acid, sodium succinate, aspartic acid, sodium aspartate, glutamic acid, sodium glutamate, lactic acid, sodium lactate, malic acid, sodium malate, tartaric acid and sodium tartrate.
4. The process according to claim 1 , wherein the carboxylic acid is chosen from citric acid and salts thereof.
5. The process according to claim 1 , wherein the composition comprises carboxylic acid in acid or salified form in an amount ranging from about 1% to about 10%.
6. The process according to claim 1 , wherein the composition comprises carboxylic acid in acid or salified form in an amount ranging from about 2% to about 5%.
7. The process according to claim 1 , wherein the composition further comprises at least one basifying agent.
8. The process according to claim 7 , wherein the basifying agent is chosen from aqueous ammonia; alkaline carbonates; alkanolamines, mono, di- and triethanolamines and derivatives thereof; sodium hydroxide; potassium hydroxide; compounds of the following formula:
wherein W is a propylene residue optionally substituted with a hydroxyl group or a C 1 -C 4 alkyl radical; R a , R b , R c and R d , which may be identical or different, represent a hydrogen atom or a C 1 -C 4 alkyl or C 1 -C 4 hydroxyalkyl radical; and mixtures thereof.
9. The process according to claim 1 , wherein the composition has a pH ranging from about 8.01 to about 13.
10. The process according to claim 1 , wherein the composition has a pH ranging from about 8.01 to about 10.
11. The process according to claim 1 , wherein the composition has a pH ranging from about 8.01 to about 9.
12. The process according to claim 1 , wherein the composition has a pH ranging from about 8.1 to about 9.
13. The process according to claim 1 , further comprising leaving the composition on the keratin fibers for a period of time ranging from about 5 minutes to about 2 hours.
14. The process according to claim 1 , further comprising leaving the composition on the keratin fibers for a period of time ranging from about 5 to about 30 minutes.
15. The process according to claim 1 , further comprising leaving the composition on the keratin fibers for a period of time ranging from about 10 to about 30 minutes.
16. The process according to claim 1 , wherein the keratin fibers have been straightened beforehand by applying a composition comprising an alkaline hydroxide.
17. The process according to claim 1 , wherein the composition is applied to wet hair.
18. The process according to claim 1 , further comprising smoothing the hair with a smoothing iron.