# US 10,945,934 B2 · Method of strengthening hair fibers and protecting dyed hair color from fading or wash-out

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,945,934 B2
- Document ID: US10945934B2
- Status: Granted
- Kind: B2
- Application number: 16/794,633
- Filed: 2020-02-19
- Published: 2020-06-18
- Granted: 2021-03-16
- Earliest claimed: 2015-07-10
- Assignees: Hercules Incorporated
- Applicants: Emmanuel Paul Jos Marie Everaert; Gijsbert Kroon; Xiaochun Zhang
- Inventors: Emmanuel Paul Jos Marie Everaert; Gijsbert Kroon; Xiaochun Zhang
- Web page: https://patentgrep.com/patent/US10945934B2

## CPC

- A61K 8/42: Amides
- A61K 8/498: {having 6-membered rings or their condensed derivatives, e.g. coumarin}
- A61Q 5/002: {Preparations for repairing the hair, e.g. hair cure}
- A61Q 5/004: {Preparations used to protect coloured hair}
- A61Q 5/12: Preparations containing hair conditioners
- 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

Disclosed is a method of strengthening hair fibers using a hair composition comprising an amide and/or an alkyl ammonium carboxylate salt. The amide can be a monoamide and/or a bisamide. A method of protecting dyed hair color from fading or wash-out using the hair composition is also included.

## Claims

### Claim 1

A method of strengthening hair fibers comprising applying to hair a hair composition comprising reaction product of glucono delta-lactone and ethylene diamine wherein the reaction product is represented by Formula (III)
wherein R1′-R4′ are independently hydrogen
R5′ and R6′ are independently hydrogen
L is —CH2-CH2-.

### Claim 2 (depends on 1)

The method of claim 1, wherein the molar ratio of the lactone compound to the alkyl diamine compound ranges from about 5:1 to about 1:5.