Two-component hair dye and method for using it

DE112023006905T5Undetermined Publication Date: 2026-07-02FLORADYNE TECH CO LTD (PEKING)
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-11-09
Publication Date
2026-07-02

AI Technical Summary

Technical Problem

Existing single-dose 5,6-dihydroxyindole hair dyes are prone to deterioration due to the mixing of dihydroxyindole and alkali, resulting in poor stability and unsatisfactory dyeing effects. The high molecular weight of melanin makes it difficult to firmly combine with the hair, resulting in dyeing uniformity. and insufficient persistence.

Method used

Adopt a two-dose hair dye solution, dividing the melanin precursor and alkali agent into two agents. First use agent I containing the dye intermediate, and then use agent II containing the alkali agent. Surfactants and thickeners are used to improve the adhesion and adhesion of the dye. uniformity, and add antioxidants to agent I to improve stability.

Benefits of technology

It achieves better coloring effect and dyeing uniformity, shortens the hair dyeing time, improves the stability and durability of the hair dye, and makes the hair smooth and soft after dyeing, without the need for additional shampooing and hair care steps.

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Abstract

The invention relates to a two-component hair dye and a method for using it. A melanin precursor is used as a dye intermediate in the hair dye. The two-component hair dye comprises: Component I and Component II, wherein Component I contains the melanin precursor and an aqueous medium, and wherein Component II comprises an alkaline agent and an aqueous medium, and wherein Component II has a pH of 8 to 14. The two-component hair dye further comprises a surfactant and a thickener, which are present at least in Component I. In the two-component hair dye according to the invention, the alkaline agent and the dye intermediate, which is primarily responsible for the hair coloring, are separated into two components. During hair coloring, Component I containing the dye intermediate is applied first, followed by Component II containing the alkaline agent.Compared to single-component hair dyes, two-component hair dyes offer stronger and more even coloring and easier storage.
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