Method for straightening keratinous fibers using heating means and an aromatic compound

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 polyhydroxylated aromatic compound, (ii) a step of increasing the temperature of the keratinous fibers, using heating means, to a temperature ranging between 110 and 250° C.

Claims

1. A process for relaxing keratin fibers, comprising: applying to the keratin fibers a hair-relaxing composition comprising a polyhydroxylated aromatic compound, wherein the pH of said hair relaxing composition is less than or equal to 9; and heating the keratin fibers to a temperature ranging from 110° C. to 250° C.; wherein the polyhydroxylated aromatic compound is gallic acid.

2. The process according to claim 1, wherein the keratin fibers are heated to a temperature ranging from 120° C. to 220° C.

3. The process according to claim 1, wherein the keratin fibers are heated to a temperature ranging from 140° C. to 220° C.

4. The process according to claim 1, wherein the hair-relaxing composition is applied to wet keratin fibers.

5. The process according to claim 1, wherein the keratin fibers are partially predried.

6. The process according to claim 1, wherein the molar concentration of gallic acid ranges from 1 to 8 M.

7. The process according to claim 1, wherein the molar concentration of gallic acid ranges from 1 to 4 M.

8. The process according to claim 1, wherein the molar concentration of gallic acid ranges from 1.5 to 3M.

9. The process according to claim 1, wherein the pH of the hair relaxing composition is less than or equal to 7.

Description

EXAMPLE 1

(1) A simplified hair-relaxing composition is prepared, containing resorcinol at a concentration of 8 M in water, as hair-relaxing active agent. This composition is applied to naturally curly African hair for 15 minutes at a temperature of 40° C., and the hair is then rapidly towel-dried.

(2) Lock-by-lock straightening of the head of hair is then performed using a flat iron heated to 180° C., for 10 to 15 seconds. The hair is efficiently relaxed and feels soft.

EXAMPLE 2

(3) A simplified hair-relaxing composition is prepared, containing resorcinol at a concentration of 4 M in water, as hair-relaxing active agent. This composition is applied to naturally curly African hair for 15 minutes at a temperature of 40° C., and the hair is then rapidly towel-dried.

(4) Lock-by-lock straightening of the head of hair is then performed using a flat iron heated to 180° C., for 10 to 15 seconds. The hair is efficiently relaxed and feels soft.

EXAMPLE 3

(5) A simplified hair-relaxing composition is prepared, containing resorcinol at a concentration of 2 M in water, as hair-relaxing active agent. This composition is applied to naturally curly African hair for 25 minutes at a temperature of 40° C., and the hair is then rapidly towel-dried.

(6) Lock-by-lock straightening of the head of hair is then performed using a flat iron heated to 180° C., for 10 to 15 seconds. The hair is efficiently relaxed and feels soft.