Method for straightening human hair fibers using heating means and malic acid

Patent metadata

Field	Value
Publication number	US-9743736-B2
Application number	US-201615296366-A
Country	US
Kind code	B2
Filing date	Oct 18, 2016
Priority date	May 24, 2006
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

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 alpha-hydroxy and/or keto acid derivative, the pH of said composition being not more than 9 (ii) a step of increasing the temperature of the keratinous fibers, using heating means, to a temperature ranging between 110 and 250° C.

First claim

The invention claimed is:

1. A process for relaxing human hair fibers, comprising:
applying to the hair fibers a hair relaxing composition comprising at least one α-hydroxy acid derivative chosen from malic acid, the stereoisomers thereof, organic or mineral salts thereof, and solvates thereof, wherein the pH of the composition is less than or equal to 9, and
heating the hair fibers;
wherein the hair fibers are heated to a temperature ranging from 110° C. to 250° C.

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

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

4. A process according to claim 1 , wherein the composition is applied to wet hair fibers.

5. A process according to claim 4 , wherein the wet hair fibers are partially predried prior to application of the hair relaxing composition.

6. A process according to claim 1 , wherein the molar concentration of the at least one α-hydroxy acid derivative ranges from 2M to 8 M.

7. A process according to claim 6 , wherein the molar concentration of the at least one α-hydroxy acid derivative ranges from 4M to 8 M.

8. A process according to claim 1 , wherein the pH of the composition is less than or equal to 7.

Assignees

• Oreal

Inventors

• MALLE GéRARD
• Barbarat Philippe
• Pasini Isabelle

Classifications

• A61K8/362

  Polycarboxylic acids · CPC title

• A61K2800/24

  Thermal properties · CPC title

• A61K8/73

  Polysaccharides · CPC title

• A61Q5/04

  Preparations for permanent waving or straightening the hair · CPC title

• A61K8/365

  Hydroxycarboxylic acids; Ketocarboxylic acids · CPC title