# US 10,500,149 B2 · Aqueous colorant composition and use thereof

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- Number: US 10,500,149 B2
- Document ID: US10500149B2
- Status: Granted
- Kind: B2
- Application number: 14/984,930
- Filed: 2015-12-30
- Published: 2017-07-06
- Granted: 2019-12-10
- Earliest claimed: 2015-12-30
- Assignees: Natural Cosmeticos S.A.; Warner Babcock Institute for Green Chemistry, LLC
- Applicants: Natura Cosméticos S.A.; Warner Babcock Institute for Green Chemistry, LLC
- Inventors: Juliana Carvalhäes Lago; Adriana de Andrade Fregonesi; Ana Paula Pedroso De Oliveira; John C. Warner; Laura Muollo; Jennifer Cookson; Carla Scanavez
- Web page: https://patentgrep.com/patent/US10500149B2

## CPC

- A61K 8/85: Polyesters
- A61K 8/24: Phosphorous; Compounds thereof
- A61Q 5/065: {Preparations for temporary colouring the hair, e.g. direct dyes}
- A61Q 5/10: Preparations for permanently dyeing the hair
- A61K 2800/432: Direct dyes
- A61K 2800/884: Sequential 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)
- A61Q: SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS

## Abstract

The present invention refers to an aqueous colorant composition comprising poly(lactic acid) (PLA) and a colorant. The invention also refers to the uses of said composition particularly in methods for coloring hair.

## Claims

### Claim 1

An aqueous colorant composition comprising poly(lactic acid) (PLA) and a colorant, wherein the PLA comprises 5.8-6.0 wt %. of the total colorant composition.

### Claim 2 (depends on 1)

The composition of claim 1 wherein the PLA is an aqueous dispersion.

### Claim 3 (depends on 1)

The composition of claim 1 wherein the colorant comprises a direct dye.

### Claim 4 (depends on 1)

The composition of claim 1 wherein the colorant comprises a mixture of two or more direct dyes.

### Claim 5 (depends on 1)

The composition of claim 1 further comprising a metal salt.

### Claim 6 (depends on 1)

The composition of claim 1 further comprising a mineral additive.

### Claim 7 (depends on 1)

The composition of claim 1 wherein the colorant that is whitener or tinting agent and comprises no more than 0.01% of the colorant composition.

### Claim 8

A method of coloring hair comprising the steps of:
a. First applying to the hair an aqueous PLA dispersion; and then
b. subsequently applying a colorant to the hair.