# US 10,117,817 B2 · Composition and process for semi-permanent straightening of the hair

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- Number: US 10,117,817 B2
- Document ID: US10117817B2
- Status: Granted
- Kind: B2
- Application number: 14/770,585
- Filed: 2013-09-16
- Published: 2016-01-07
- Granted: 2018-11-06
- Earliest claimed: 2013-02-28
- Assignees: Kao Corporation
- Applicants: Kao Corporation
- Inventors: Burkhard Rose; Jonathan Wood; Manfred Dürr; Jörg Schneider; Peter Bauer
- Web page: https://patentgrep.com/patent/US10117817B2

## CPC

- A61K 8/36: Carboxylic acids; Salts or anhydrides thereof
- A45D 2/001: {Hair straightening appliances}
- A45D 7/06: combined chemical and thermal
- A61K 8/042: {Gels}
- A61K 8/06: Emulsions
- A61K 8/31: Hydrocarbons
- A61K 8/33: containing oxygen
- A61K 8/342: {Alcohols having more than seven atoms in an unbroken chain}
- A61K 8/365: Hydroxycarboxylic acids; Ketocarboxylic acids
- A61K 8/73: Polysaccharides
- A61K 8/731: {Cellulose; Quaternized cellulose derivatives}
- A61K 8/8147: {Homopolymers or copolymers of acids; Metal or ammonium salts thereof, e.g. crotonic acid, (meth)acrylic acid; Compositions of derivatives of such polymers}
- A61K 8/8152: {Homopolymers or copolymers of esters, e.g. (meth)acrylic acid esters; Compositions of derivatives of such polymers}
- A61K 8/817: {Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Compositions or derivatives of such polymers, e.g. vinylimidazol, vinylcaprolactame, allylamines (Polyquaternium 6)}
- A61K 8/89: Polysiloxanes
- A61K 8/891: saturated, e.g. dimethicone, phenyl trimethicone, C24-C28 methicone or stearyl dimethicone
- A61K 8/922: {of vegetable origin}
- A61Q 5/04: Preparations for permanent waving or straightening the hair
- A61Q 5/06: Preparations for styling the hair, e.g. by temporary shaping or colouring
- A61Q 5/12: Preparations containing hair conditioners
- A61K 2800/48: Thickener, Thickening system
- A61K 2800/5422: nonionic
- A61K 2800/5424: anionic
- A61K 2800/5426: cationic
- A61K 2800/5428: amphoteric or zwitterionic
- A61K 2800/594: Mixtures of polymers
- 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 provides a hair straightening composition with improved ease of use and reduced smoke development during the application of a straightening iron. The composition comprises at least one carboxylic acid of the formula (I) in combination with at least one polymeric thickening agent selected from non-ionic, anionic, cationic and amphoteric polymers having a viscosity of at least 500 mPa-s measured at a polymer concentration of 1% by weight, in water and at 20° C. with a Brookfield viscometer: R—CO—COOH Formula (I) In further aspects, the present invention concerns a process for semi-permanent straightening of the hair, utilizing said composition, the use of the composition for straightening hair, and a kit comprising the composition and a straightening iron.

## Claims

### Claim 1

A process for semi-permanent hair straightening, comprising the following steps performed in this order:
(a) application of a hair straightening composition;
(b) leaving the composition on the hair for 10 to 60 minutes;
(c) optionally rinsing off the hair;
(d) drying the hair;
(e) treating the hair with an iron having a surface temperature of 180±50° C., and
(f) optionally rinsing off and/or shampooing the hair and drying,
wherein the hair straightening composition has a pH of 1 to 3 and is an emulsion comprising:
glyoxylic acid and/or a hydrate thereof and/or a salt thereof, at a total concentration in the range of 2.5 to 25% by weight, based on the weight of the total composition;
at least one polymeric thickening agent having a viscosity of at least 500 mPa measured at a polymer concentration of 1% by weight, in water and at 20° C. with a Brookfield viscometer, wherein the polymeric thickening agent is an anionic polymer,
a cationic surfactant; and
at least one higher alcohol having 8 to 22 carbon atoms,
wherein the combination with the application of a reducing composition or an alkaline relaxer is excluded.

### Claim 2 (depends on 1)

The process of claim 1, wherein the hair is treated with an iron having a surface temperature of 170 to 200° C.

### Claim 3 (depends on 1)

The process according to claim 1, wherein the hair straightening composition is a two-part composition comprising the parts A and B, which are provided for separate storage and for mixing prior to the application to the hair,
wherein part A comprises glyoxylic acid and/or a hydrate thereof and/or a salt thereof, and part B comprises at least one of a fragrance, a cationic surfactant or a conditioning component, and
wherein the polymeric thickening agent is contained in either or both of part A and part B.

### Claim 4 (depends on 3)

The process according to claim 3, wherein the fragrance is one or more fragrance raw materials having citric note, selected from Limonene, Pinene, Citral, Dihydromyrcenol, Pamplefleur, Lemon oil, Orange oil, Mandarin oil and Lime oil.

### Claim 5 (depends on 1)

The process according to claim 1, wherein the polymeric thickening agent is an anionic polymer selected from xanthan gum, hydroxypropyl xanthan gum and dehydro xanthan gum.

### Claim 6 (depends on 1)

The process according to claim 1, wherein the hair straightening composition further comprises a silicone.