Methods for dyeing hair keratin fibers comprising the application of a composition comprising a (poly)carbodiimide compound and a colorant and the application of a composition comprising an acid

By using a composition containing (poly)carbodiimide compounds and acids, the problem of color coatings being unable to withstand shampoo washing and external stress in existing dyeing methods is solved, achieving a uniform and long-lasting coloring effect on the hair.

CN122206403APending Publication Date: 2026-06-12LOREAL SA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LOREAL SA
Filing Date
2024-12-20
Publication Date
2026-06-12

AI Technical Summary

Technical Problem

Existing dyeing methods produce color coatings on hair that are not resistant to shampoo washing and external stresses such as brushing and friction, making it difficult to achieve a uniform and long-lasting coloring effect.

Method used

A composition comprising a (poly)carbodiimide compound and selected from pigments, direct dyes and mixtures thereof, combined with a composition comprising an acid, is used to form a uniform colored coating by applying these compositions to hair keratin fibers, wherein the pH of the acid is less than or equal to 6.

Benefits of technology

A uniform color coating is achieved on the hair, improving its resistance to shampoo washing and external stress, and ensuring the longevity of the coloring effect.

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Abstract

The present invention relates to a process for dyeing hair keratin fibers, comprising: a) applying to the hair keratin fibers at least one hair keratin fiber dye composition C comprising: i) at least one (poly)carbodiimide compound; and ii) at least one colorant chosen from pigments, direct dyes, and mixtures thereof; and b) applying to the hair keratin fibers a composition T comprising water and at least one acid, the pH of said composition T being less than or equal to 6.
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Citation Information

Patent Citations

  • Improved process for the production of carbodiimide modified organic isocyanates

    CA2509861A1

  • Use of an insoluble pigment obtained by oxidative polymerisation of indole derivatives for the temporary dyeing of keratinous fibres

    FR2679771A1

  • Metallic paint and method for coating therewith

    JP1993017710A

  • Resin composition

    JP1995258460A

  • Highly bright metallic pigment

    JP1997188830A