# US 10,864,150 B2 · Hair treatment process

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- Number: US 10,864,150 B2
- Document ID: US10864150B2
- Status: Granted
- Kind: B2
- Application number: 15/022,143
- Filed: 2013-09-16
- Published: 2016-08-18
- Granted: 2020-12-15
- Earliest claimed: 2013-09-16
- Assignees: Kao Corporation
- Applicants: Kao Corporation
- Inventors: Burkhard Rose; Jonathan Wood; Robert Kussmaul
- Web page: https://patentgrep.com/patent/US10864150B2

## CPC

- A61K 8/365: Hydroxycarboxylic acids; Ketocarboxylic acids
- A45D 7/06: combined chemical and thermal
- A45D 20/04: Hot-air producers (A45D20/20, A45D20/22 take precedence)
- A61K 8/31: Hydrocarbons
- A61K 8/342: {Alcohols having more than seven atoms in an unbroken chain}
- A61K 8/416: {Quaternary ammonium compounds (A61K8/35 takes precedence)}
- A61K 8/73: Polysaccharides
- A61K 8/731: {Cellulose; Quaternized cellulose derivatives}
- A61K 8/891: saturated, e.g. dimethicone, phenyl trimethicone, C24-C28 methicone or stearyl dimethicone
- A61Q 5/04: Preparations for permanent waving or straightening the hair
- A61K 2800/30: Characterized by the absence of a particular group of ingredients
- A61K 2800/48: Thickener, Thickening system
- A61K 2800/882: Mixing prior to application
- A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D)
- A45D: HAIRDRESSING OR SHAVING EQUIPMENT (wigs, toupees or the like A41G3/00, A41G5/00; hairdressers' chairs A47C1/04; hair cutting appliances, razors B26B); EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
- A61Q: SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS

## Abstract

The present invention a process for straightening the hair, using a composition comprising at least one carboxylic acid of the formula (I): R—CO—COOH Formula (I) The process of the invention is characterized in that it involves the treating of the hair with the composition and the drying of the treated hair under conditions of mechanical tension and hot air flow having a temperature of 60-140° C.

## Claims

### Claim 1

Process for straightening hair, comprising the following steps performed in this order:
(a) application of a hair straightening composition having a pH of 1 to 3 and comprising glyoxylic acid glyoxylic acid is from 2.5% to 14% by weight of the hair straightening composition;
(b) leaving the composition on the hair for 15 to 45 minutes;
(c) optionally rinsing off the hair;
(d) drying the hair under conditions of mechanical tension and hot air flow, so that the temperature on the hair is 80-130° C.; and
(e) optionally rinsing off and/or shampooing the hair,
wherein the hair straightening composition does not comprise a reducing composition and an alkaline relaxer, wherein the hair straightening composition is a gel, and wherein the hair straightening composition comprises 0.5-2% of polymeric thickening agents selected from the group consisting of, xanthan gum, dehydroxanthan gum and hydroxypropyl xanthan and wherein step (d) is performed by holding a hair strand fixed in an elongated state and applying a stream of hot air to the strand with a hair dryer.

### Claim 2 (depends on 1)

The process according to claim 1, wherein the temperature in step (d) is within the range of 90 to 110° C.