# US 10,945,931 B2 · Shaping keratin fibres using dialdehyde compounds

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- Number: US 10,945,931 B2
- Document ID: US10945931B2
- Status: Granted
- Kind: B2
- Application number: 15/185,439
- Filed: 2016-06-17
- Published: 2016-12-22
- Granted: 2021-03-16
- Earliest claimed: 2015-06-18
- Assignees: The Procter & Gamble Company
- Applicants: The Procter & Gamble Company
- Inventors: Randy Purnell Washington; Jamie Angel Reed; Yonas Gizaw
- Web page: https://patentgrep.com/patent/US10945931B2

## CPC

- A61K 8/33: containing oxygen
- A61K 8/4926: {having six membered rings}
- A61K 8/498: {having 6-membered rings or their condensed derivatives, e.g. coumarin}
- A61K 8/602: {Glycosides, e.g. rutin}
- 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 2800/81: Preparation or application process involves irradiation
- 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)
- A61Q: SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS

## Abstract

Described herein is a method for shaping keratin fibres including (i) providing a crosslinking composition comprising from about 1% to about 20% of a dialdehyde compound, optionally a photocatalyst, and a cosmetically acceptable carrier; (ii) applying the crosslinking composition to keratin fibres; and (iii) mechanically shaping the keratin fibres with an appliance at a temperature of about 50° C. to about 280° C.

## Claims

### Claim 1

A method for straightening hair comprising:
providing a crosslinking composition comprising a cosmetically acceptable carrier and from about 1% to about 20% of pentodialdose
b) applying the crosslinking composition to hair for a period of at least two minutes;
c) drying the hair; and then
d) mechanically straightening the hair with a hair straightening appliance comprising metal or ceramic plates at a temperature of 50° 130° C. to 250° C.;
wherein there is no rinsing between steps (b) and (c); and
wherein the crosslinking composition further comprises a photocatalyst, wherein the photocatalyst is 8-hydroxyquinoline; and wherein from about 0.01 gram to about 5 grams of said crosslinking composition is applied per gram of hair.

### Claim 2 (depends on 1)

The method of claim 1, wherein the crosslinking composition has not been exposed to electromagnetic radiation having a wavelength of about 750 nm or less for about 30 min or more.

### Claim 3 (depends on 2)

The method of claim 2, wherein the mechanically straightening further comprises exposing the crosslinking composition to electromagnetic radiation having a wavelength of from about 300 nm to about 750 nm.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the photocatalyst can be activated to a photo-excited state by excitation with incident radiation with a wavelength of from about 300 nm to about 750 nm, and wherein the appliance emits radiation with a wavelength from about 300 nm to about 750 nm.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the appliance comprises light-emitting diodes.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the cross-linking composition is substantially free of formaldehyde, derivatives of formaldehyde, formalin, and any compound that produces formaldehyde upon heating.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the crosslinking composition further comprises from about 2% to about 18% of a reducing sugar, by weight of the crosslinking composition.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the crosslinking composition further comprises 1,2-bis(2-maleimidoethoxy)ethane.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the crosslinking composition further comprises a conditioning agent, and wherein the conditioning agent is a reaction product of an aminosilane and a polysiloxane.