Hair-coloring compositions, aerosol products, and methods for coloring hair

Abstract

The present disclosure relates to hair-coloring compositions comprising direct dyes, and aerosol hair-coloring products comprising the hair-coloring compositions. The hair-coloring compositions include: (a) at least one direct dye selected from nitro-phenylenediamines, nitro-aminophenols, azo dyes, anthraquinones, triarylmethane dyes, indophenols, and a mixture thereof; (b) at least one nonionic film forming polymer; (c) at least one thickening agent; (d) at least 40 wt. % of water, based on the total weight of the compositions; and (e) 40 wt. % or less of ethanol, based on the total weight of the composition. The hair-coloring compositions can be combined with a propellant and incorporated into a canister to provide a hair-coloring aerosol product. The compositions and aerosol products are useful for coloring hair.

Description

FIELD OF THE DISCLOSURE[0001]The present disclosure relates to water-based direct dye compositions that quickly and effectively color hair; and to methods for coloring hair.BACKGROUND[0002]There are many methods and products available for changing the natural color of hair. Semi-permanent or temporary dyeing methods, or direct dyeing methods, temporarily change the color of hair. These methods can change the color of the hair to varying degrees and the color change may withstand several rounds of shampooing. Many consumers seek more permanent results, and therefore default to oxidative dye products that contain hydrogen peroxide or other oxidants. In order to provide the consumer with the shade, longevity, and the intensity of color desired, an oxidative coloring process is utilized. Permanent hair dyeing formulations typically include primary intermediates (also known as oxidative hair dye precursors or developers) and couplers (also known as color modifiers or secondary intermedia...

AI Technical Summary

Benefits of technology

This patent is about a new hair coloring product that can be sprayed onto hair. The product contains direct dyes, which are normally thought of as fading quickly. However, this patent shows that by using more water and less ethanol, the color sticks to hair better and doesn't fade after multiple washings. The product is easy to use, works quickly, and is particularly effective.

Problems solved by technology

However, each attempt has its drawbacks.

However, the same strong binding force to the cuticle also prevents the chromophores from penetrating deep into the cortex of hair, because it is difficult for dyes with multiple positive charges to diffuse through negatively charged networks of keratin proteins.

Additionally, since polycationic dyes remain bound to the hair surface rather than penetrating into the fiber, it is difficult to produce dark shades, due to limited binding sites on the surface of hair.

This process can be messy and time consuming.

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