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EP-4736837-A1 - LACCASE FOR REDUCING PIGMENT LEACHING FROM DYED HAIR

EP4736837A1EP 4736837 A1EP4736837 A1EP 4736837A1EP-4736837-A1

Abstract

The invention relates to a post-color hair care composition comprising laccase and having a pH of ≤ 7.0. Said composition protects dyed hair from fading or wash-out during exposure to air and/or shampooing.

Inventors

  • BELOUS, Elena
  • IVANOVA, Angelina

Assignees

  • SkyLab AG

Dates

Publication Date
20260506
Application Date
20241030

Claims (15)

  1. A post-color hair care composition comprising laccase and having a pH of ≤ 7.0.
  2. The composition of claim 1, wherein said composition has a pH in the range of 4.5 - 7.0.
  3. The composition of claim 1 or claim 2, wherein said laccase is present in said composition in an amount of at least 0.05% by weight of said composition, preferably at least 0.25% by weight, further preferably at least 0.5% by weight or in an amount of a range selected from the following: 0.01-10% by weight, 0.01-5% by weight, 0.01-3.0% by weight, 0.01-1.0% by weight, 0.05-10% by weight, 0.05-5% by weight, 0.05-3.0% by weight, 0.05-1.0% by weight, 0.1-10% by weight, 0.1-5% by weight, 0.1-3.0% by weight, 0.1-1.0% by weight, 0.25-10% by weight, 0.25-5% by weight, 0.25-3.0% by weight, 0.25-1.0% by weight, 0.5-10% by weight, 0.5-5% by weight, 0.5-3.0% by weight, 0.5-1.0% by weight.
  4. The composition of any of the preceding claims, said composition not comprising a phenolic compound and/or a hair coloring dye.
  5. The composition of claim 4, wherein said phenolic compound is selected from the group consisting of gallic acid, syringic acid, ferulic acid, catechin and catechol.
  6. The composition of any of the preceding claims, wherein said hair dye color is selected from the following: blue, emerald, red, copper and violet.
  7. The composition of any of the preceding claims, wherein said composition is formulated for application on a subject's hair.
  8. The composition of any of the preceding claims, wherein said composition is a formulation selected from the following: liquid, aerosol, suspension, solution, tincture, cream, paste, lotion, ointment, gel, balsam, foam, shampoo and conditioner.
  9. The composition of any of the preceding claims, wherein said composition is for protecting dyed hair color from fading or wash-out during exposure to air and/or shampooing, preferably for protecting said dyed hair of a living subject, wherein said living subject is further preferably a human or an animal.
  10. Use of the composition of any of the preceding claims in the non-medical post-color treatment of dyed hair of a subject, including cosmetic and aesthetic treatment.
  11. The use of claim 10, wherein said non-medical treatment protects said dyed hair from fading or wash-out during exposure to air and/or shampooing, wherein preferably said treatment protects said dyed hair of a living subject, wherein said living subject is further preferably a human or an animal.
  12. The use of laccase in the manufacture of composition of any of claims 1-9.
  13. A post-color treatment method of protecting dyed hair color from fading or wash-out during exposure to air and/or shampooing, said method comprising treating the dyed hair with a composition of any of claims 1-9.
  14. The method of claim 13, wherein said treatment comprises treating said dyed hair in a leave-in manner with said composition.
  15. The method of claim 13 or claim 14, wherein said method protects said dyed hair from said fading or wash-out for up to six weeks.

Description

FIELD OF THE INVENTION The present invention pertains to novel applications of Laccase for reducing pigment leaching from dyed hair, including its use for prolonging color vibrancy. The present invention can be applied in the field of hair care products. BACKGROUND OF THE INVENTION In recent years, there has been an increasing interest in self-image, which individuals project to others, influencing how they are perceived, particularly in the context of rising aspirations toward aesthetic appeal. Cosmetic products, including hair care products, play a critical role in this process. Hair is considered an important indicator of attractiveness and beauty, as well as a means of expressing gender identity. Regardless of gender, age, income level, or social status, individuals resort to chemical hair treatments, highlighting the importance of appearance in modern society. Modern technologies allow for easy alteration of hairstyles through bleaching, dyeing, and perming, using a variety of natural and synthetic components. This trend contributes to the growing global interest in chemical hair transformation products. Statistical data indicates that in the United States and Europe, between 50% and 80% of women, and approximately 10% of men over 40, have experienced hair dyeing. Analysis of trends in hair dye use shows the stability of these figures over the past decades [1]. Hair dyeing involves treating hair with various chemical compounds to change its color. Based on the duration of the color's presence on the hair, these products are classified as either temporary or permanent. This classification depends on the type of active substances used in the dyeing process, and the methods, which are divided into non-oxidative and oxidative hair coloring agents. Permanent hair dyes typically contain active chemical components that do not color the hair directly but undergo oxidation to achieve the desired shade, leading to the term "oxidative hair dye". The main ingredients in oxidative dyes are a precursor and an oxidizing agent. Quinonediimine intermediates are transient products formed upon interaction with hydrogen peroxide, which serves as the developer. The resulting interaction between the oxidizing agent and these intermediates forms the dye molecule. It is important to note that successful dyeing requires both an alkaline environment and an oxidizer-most commonly hydrogen peroxide-allowing the colorants to penetrate deeply into the hair cuticle [2]. Hair dyeing is becoming increasingly popular; however, the rapid fading of the newly applied color poses a significant challenge for consumers. This phenomenon is primarily related to aesthetic concerns: hair loses its brightness and color intensity within just a few weeks after the procedure, even before noticeable regrowth. There are two main approaches to addressing this issue. The first is to develop more long-lasting dyes, and the second is to slow down pigment washout. The primary loss of color in dyed hair usually occurs due to dye leaching during regular shampooing and exposure to external factors such as ultraviolet radiation, which can degrade dye molecules. However, studies show that shampooing is the most significant factor in color loss, while UV exposure becomes notable only after 90 hours of intense exposure. The mechanism behind hair color fading caused by shampooing is not yet fully understood. Nevertheless, several key factors influencing this process have been identified. One of these is the solubility of the dye in water. Most dyes used for hair coloring are water-soluble, and the rate at which they are removed by shampooing depends on this characteristic. The solubility of the dye is determined by its chemical structure, and typically bi-nuclear dyes exhibit higher solubility. Red dyes, in particular, show more pronounced fading, as they are more water-soluble and thus more prone to washout. Another factor is the extent of hair damage. Damaged hair has a more porous structure, making it easier for dye molecules to be released during washing. As a result, bleached hair loses color more quickly than unbleached hair, as it loses the protective F-layer and increases pore size within cuticle cells. Additionally, when exposed to water, the cuticle and cortex swell, creating additional pathways for dye leaching. Surfactants (SLS) contained in shampoos and conditioners contribute to the wetting and saturation of the hair shaft, further facilitating the leaching of dye molecules. Consumers seek to maintain color vibrancy until the next oxidative process, which implies protecting dyed hair from fading for up to six weeks - the period required for color renewal at the noticeable regrowth stage. Meeting this demand remains a pressing challenge for the cosmetic industry. Color protection is considered a crucial focus in the hair care product market. In recent years, there has been a significant expansion in the range of color-protective products, most of whic