US-12622858-B2 - Additives for coloring agents and methods of use thereof

Abstract

Disclosed are methods for coloring hair, comprising applying a mixture comprising one or more hair dyes and an additive as a pre-treatment, as a simultaneous treatment, as a post-treatment, or a combination thereof.

Inventors

• Soo-Young Kang
• Zhaoxia Ji
• Dinara A. Villanueva
• Nawodi Abeyrathna

Assignees

• LIVING PROOF, INC.

Dates

Publication Date

20260512

Application Date

20200626

Claims (6)

1. 1 . A method for coloring hair, comprising: i) providing a hair sample; ii) applying a composition comprising an additive in a concentration of about 0.25% by weight to about 15% by weight of the total weight of the composition to the hair sample for a period of time, thereby producing a treated hair sample, wherein the additive is N-acetyl-L-cysteine; and iii) applying to the treated hair sample a mixture, comprising one or more hair dyes, thereby producing a color-treated hair sample.
2. 2 . A method for coloring hair, comprising: i) providing a hair sample; ii) applying to the hair sample for a period of time a mixture, comprising one or more hair dyes, thereby producing a color-treated hair sample; and iii) applying a composition comprising an additive in a concentration of about 0.25% by weight to about 15% by weight of the total weight of the composition to the color-treated hair sample, wherein the additive is a combination of citric acid and gluconolactone.
3. 3 . The method of claim 1 , wherein the concentration of the additive is about 0.5% by weight to about 5% by weight of the total weight of the composition.
4. 4 . The method of claim 2 , wherein the concentration of the additive is about 0.5% by weight to about 5% by weight of the total weight of the composition.
5. 5 . The method of claim 1 , wherein the one or more hair dyes comprise one or more oxidative dyes.
6. 6 . The method of claim 2 , wherein the one or more hair dyes comprise one or more oxidative dyes.

Description

RELATED APPLICATIONS This application is a 35 U.S.C. § 371 national stage filing of International Application No. PCT/US2020/039759, filed on Jun. 26, 2020, which claims priority to U.S. Provisional Application No. 62/868,210, filed Jun. 28, 2019, the entire contents of each of which are incorporated herein by reference. BACKGROUND Hair coloring is by far the most popular form of chemical hair treatment. Whether the purpose is to cover gray hair or to change the color of your entire head of hair, hair coloring is an easy process to achieve that. Hair coloring agents (also referred to as hair dyes) used for coloring can be classified into three categories based on the color durability: temporary, semi-permanent, and permanent. Among them, permanent hair dyes are most commonly used. A permanent hair dye generally consists of oxidative dye precursors (i.e., primary intermediates and couplers) that are oxidized by hydrogen peroxide and form large color molecules inside the hair. Although the oxidative dyes provide long-lasting color, the aggressive chemicals used or formed during the coloring process can cause extensive hair damage. To reduce the hair damage by coloring, various methods for coloring hair with additives have been developed. For example, an additive can be incorporated into a coloring mixture or can be used as a separate pre-treatment or post-treatment step before or after dyeing hair. In addition to the damage caused by hair dyeing, hair is repeatedly weathered in response to stresses such as washing, drying, brushing, combing, rubbing, styling, and sun exposure, the 18-methyl eicosanoic acid layer is lost and the hair surface becomes more hydrophilic, negatively charged, and damaged-feeling. Efforts were also made to deliver more consistent hair color throughout the hair and to provide improved color resistance to regular shampoo and conditioner washes, i.e., improved color retention. Methods to reduce damage and to deliver more consistent hair color with hair dyeing is still an unmet need. SUMMARY In one aspect, the disclosure provides a method for coloring hair, comprising: i) providing a hair sample; andii) applying to the hair sample for a period of time a mixture, comprising one or more hair dyes and an additive in a concentration of about 0.1% by weight to about 15% by weight, thereby producing a color-treated hair sample. In another aspect, the disclosure provides a method for coloring hair, comprising: i) providing a hair sample; andii) applying to the hair sample for a period of time a composition comprising one or more hair dyes and an additive in a concentration of about 0.1% by weight to about 15% by weight of the total weight of the composition, thereby producing a color-treated hair sample. In another aspect, the disclosure provides a method for coloring hair, comprising: i) providing a hair sample;ii) applying an additive in a concentration of about 0.1% by weight to about 15% by weight to the hair sample for a period of time, thereby producing a treated hair sample; andiii) applying to the treated hair sample a mixture, comprising one or more hair dyes, thereby producing a color-treated hair sample. In another aspect, the disclosure provides a method for coloring hair, comprising: i) providing a hair sample;ii) applying a composition comprising an additive in a concentration of about 0.1% by weight to about 15% by weight of the total weight of the composition to the hair sample for a period of time, thereby producing a treated hair sample; andiii) applying to the treated hair sample a mixture, comprising one or more hair dyes, thereby producing a color-treated hair sample. In another aspect, the disclosure provides a method for coloring hair, comprising: i) providing a hair sample;ii) applying to the hair sample for a period of time a mixture, comprising one or more hair dyes, thereby producing a color-treated hair sample; andiii) applying an additive in a concentration of about 0.1% by weight to about 15% by weight to the color-treated hair sample. In another aspect, the disclosure provides a method for coloring hair, comprising: i) providing a hair sample;ii) applying to the hair sample for a period of time a mixture, comprising one or more hair dyes, thereby producing a color-treated hair sample; andiii) applying a composition comprising an additive in a concentration of about 0.1% by weight to about 15% by weight of the total weight of the composition to the color-treated hair sample. In another aspect, the disclosure provides a method for coloring hair, comprising: i) providing a hair sample;ii) applying a first additive in a concentration of about 0.1% by weight to about 15% by weight to the hair sample for a period of time, thereby producing a treated hair sample; andiii) applying to the treated hair sample for a period of time a mixture, comprising one or more hair dyes and a second additive in a concentration of about 0.1% by weight to about 15% by weight, thereby produ