# US 11,110,046 B2 · Shaping keratin fibres using 2-hydroxypropane-1,2,3-tricarboxylic acid and/or 1,2,3,4-butanetetracarboxylic acid

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- Number: US 11,110,046 B2
- Document ID: US11110046B2
- Status: Granted
- Kind: B2
- Application number: 14/577,003
- Filed: 2014-12-19
- Published: 2015-06-25
- Granted: 2021-09-07
- Earliest claimed: 2013-12-19
- Assignees: The Procter & Gamble Company
- Applicants: The Procter & Gamble Company
- Inventors: Randy Purnell Washington; Jamie Angel Reed; Alan David Willey; Stevan A. Samuel
- Web page: https://patentgrep.com/patent/US11110046B2

## CPC

- A61K 8/4926: {having six membered rings}
- A45D 7/06: combined chemical and thermal
- A61K 8/347: {Phenols}
- A61K 8/362: Polycarboxylic acids
- A61K 8/365: Hydroxycarboxylic acids; Ketocarboxylic acids
- A61K 8/40: containing nitrogen (quinones containing nitrogen A61K8/355)
- 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
- A61K 2800/30: Characterized by the absence of a particular group of ingredients
- A61K 2800/81: Preparation or application process involves irradiation
- A61K 2800/95: Involves in-situ formation or cross-linking of polymers
- 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

A method for shaping keratin fibres comprising: providing a crosslinking composition, wherein the crosslinking composition comprises: an active agent, wherein the active agent is selected from the group consisting of: 2-hydroxypropane-1,2,3-tricarboxylic acid, 1,2,3,4-butanetetracarboxylic acid, a derivative thereof, and mixtures thereof; and wherein the active agent has a molecular weight of 500 g/mol or less; a photocatalyst; a cosmetically acceptable carrier; and applying the crosslinking composition to keratin fibres, mechanically shaping the keratin fibres with an appliance at a temperature of from about 80° C. to about 180° C. and exposing the composition to electromagnetic radiation having a wavelength of from about 300 nm to about 750 nm. Also a related composition, use, kit and process.

## Claims

### Claim 1

A method for straightening curly hair comprising:
(a) providing in a package a solid composition, wherein the solid composition comprises:
hydrophobically modified alkali soluble acrylic polymer emulsion;
an active agent, wherein the active agent is a mixture of 2-hydroxypropane-1,2,3-tricarboxylic acid and 1,2,3,4-butanetetracarboxylic acid;
a photocatalyst which is a mixture of 8-hydroxyquinoline and 8-quinolinol-1-oxide;
and then mixing the solid composition with a cosmetically acceptable carrier to form a crosslinking composition comprising from about 10% to about 90% water;
wherein the crosslinking composition has a viscosity of from about 1 mPa·s to about 80,000 mPa·s; and then
(b) applying the crosslinking composition comprising from about 5% by weight of active agent, 100 ppm 8-hydroxyquinoline and 100 ppm 8-quinolinol-1-oxide photocatalyst to curly hair, mechanically straightening the hair with a hair straightening iron at a temperature of about 250° F. and exposing the composition to electromagnetic radiation having a wavelength of 380 nm;
wherein the method does not comprise a rinsing step between step (a) and step (b) and wherein the crosslinking composition prepared by the mixing stage of step (a) has not been exposed to said radiation for a period of 10 minutes or more and wherein it is not a requirement that the solid composition of step (a) has not been exposed to said radiation;
and wherein 0.25 g of said crosslinking composition per gram of hair is used in the method.

### Claim 2 (depends on 1)

The method of claim 1, wherein said iron comprises light-emitting diodes which emit radiation with a wavelength from about 300 nm to about 750 nm.

### Claim 3 (depends on 1)

The method of claim 1, wherein the composition is substantially free of: formaldehyde, derivatives of formaldehyde, formalin, and any compound that produces formaldehyde upon heating.