# US 10,478,643 B2 · Hair dyeing composition

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- Number: US 10,478,643 B2
- Document ID: US10478643B2
- Status: Granted
- Kind: B2
- Application number: 15/566,117
- Filed: 2016-04-14
- Published: 2018-04-26
- Granted: 2019-11-19
- Earliest claimed: 2015-04-16
- Assignees: Kao Germany GmbH
- Applicants: Kao Germany GmbH
- Inventors: Dominic Pratt; Bernd Nöcker; Fariba Ghiasi
- Web page: https://patentgrep.com/patent/US10478643B2

## CPC

- A61K 8/494: {with more than one nitrogen as the only hetero atom}
- A61K 8/44: Aminocarboxylic acids or derivatives thereof, e.g. aminocarboxylic acids containing sulfur; Salts; Esters or N-acylated derivatives thereof
- A61K 8/447: {containing sulfur}
- A61K 8/466: {containing sulfonic acid derivatives; Salts}
- A61K 8/49: containing heterocyclic compounds
- A61Q 5/065: {Preparations for temporary colouring the hair, e.g. direct dyes}
- 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

The present invention relates to a hair dyeing composition comprising select hair direct dyes and a reducing agent in order to color hair homogeneously, intensively and durably.

## Claims

### Claim 1

A ready to use aqueous composition for coloring hair comprising one or more direct dyes selected from the compounds
and one or more reducing agents selected from the group consisting of thioglycolic acid and its salts, thiolactic acid and its salts, dihydrolipoate, thioglycerol, mercapropropionic acid and its salts, cysteine and its salts, N substituted cysteins, cystamines, thioethanol, sulfite salts, bisulfite salts, and metabisulfite salts.

### Claim 2

A two-part aqueous hair coloring composition comprising parts A and B for mixing prior to application onto hair, wherein the part A is an aqueous composition comprising one or more direct dyes selected from the compounds
and the part B is an aqueous composition comprising one or more reducing agents selected from the group consisting of thioglycolic acid and its salts, thiolactic acid and its salts, dihydrolipoate, thioglycerol, mercapropropionic acid and its salts, cysteine and its salts, N substituted cysteins, cystamines, thioethanol, sulfite salts, bisulfite salts, and metabisulfite salts.

### Claim 3 (depends on 1)

The composition according to claim 1, wherein the one or more direct dyes are comprised at a concentration 0.001 to 10% by weight, calculated to the total of the composition.

### Claim 4 (depends on 1)

The composition according to claim 1, further comprising:
additional direct dyes selected from neutral, cationic and anionic dyes.

### Claim 5 (depends on 1)

The composition according to claim 1, wherein the one or more reducing agents are present at a total concentration of 0.001 to 10% by weight, calculated to the total of the composition.

### Claim 6 (depends on 1)

The composition according to claim 1, further comprising:
one or more alkalizing agents, at a total concentration in the range between 1 and 35% by weight, calculated to the total of the composition.

### Claim 7 (depends on 6)

The composition according to claim 6, wherein the one or more alkalizing agents are selected from ammonia and a compound according to the general structure
R9R10R11N
wherein R9, R10 and R11 are same or different H, C1-C6 alkyl, C1-C6 monohydroxyalkyl or C2-C6 polyhydroxyalkyl with the condition that at least one of R9, R10 and R11 is a mono or polyhydroxyalkyl, C1-C4 monohydroxyalkyl or C2-C4 polyhydroxyalkyl with the condition that at least one of R9, R10 and R11 is a mono or polyhydroxyalkyl.

### Claim 8 (depends on 1)

The composition according to claim 1, further comprising:
one or more organic solvents, at a total concentration in the range of 0.5 to 40% by weight, calculated to the total of the composition.

### Claim 9 (depends on 1)

The composition according to claim 1, further comprising:
one or more fatty alcohols.

### Claim 10 (depends on 1)

The composition according to claim 1, further comprising:
one or more surfactants selected from non-ionic, anionic and cationic ones.

### Claim 11 (depends on 1)

The composition according to claim 1, wherein the composition has a pH in the range of 2 to 11.

### Claim 12 (depends on 1)

A process for coloring hair, the process comprising:
applying the composition according to claim 1 onto hair for a period of 1 to 45 min;
rinsing the composition off from the hair; and
drying the hair.

### Claim 13 (depends on 12)

The process according to claim 12, further comprising:
shampooing the hair with an additional composition comprising oxidizing agent before drying the hair.