Copper Hair Dye Formulation with Nonionic Surfactants
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Solution Overview
Problem
Current oxidative hair dye formulations for achieving copper shades lack optimal color intensity, brilliance, and wash fastness, particularly shifting towards brown tones due to the presence of anionic surfactants.
Innovation Solution
A multicomponent packaging unit for oxidatively dyeing keratin fibers, comprising 1-(2-hydroxyethyl)-4,5-diamino pyrazole, 2,6-dihydroxy-3,4-dimethylpyridine, and hydrogen peroxide, with a minimal content of nonionic surfactants and no more than 0.6 wt% anionic surfactants, to produce intense and reddish copper shades with improved fastness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If anionic surfactants are used in oxidative hair dye formulations, then the formulation provides good foaming and emulsification properties, but the color intensity and brilliance of copper shades deteriorates with unwanted brown tones
Solution Approach 1:
The patent removes anionic surfactants from the formulation entirely and replaces them with nonionic surfactants. This extraction of the harmful component (anionic surfactants that cause brown tones) while retaining the necessary functional properties through alternative materials (nonionic surfactants) resolves the contradiction between ease of operation and manufacturing precision.
Solution Approach 2:
The patent changes the chemical parameter of the surfactant from anionic to nonionic type. This parameter change fundamentally alters the interaction with the dye components, preventing the formation of brown tones while maintaining foaming and emulsification properties, thus resolving the contradiction between operational ease and color precision.
2Ease of operation
If conventional oxidative dye formulations are used, then the color application is easy, but the wash fastness and durability of copper shades deteriorates
Solution Approach 1:
The patent extracts and removes anionic surfactants that interfere with color fastness, replacing them with nonionic surfactants that provide improved reliability. This removal of the harmful component eliminates the mechanism that causes color fading and browning during washing, while maintaining application ease.
3Stability of the object's composition
If anionic surfactants are present in the formulation, then the formulation provides good stability, but the brilliance and reddish tone of copper shades deteriorates
Solution Approach 1:
The patent changes the ionic parameter of the surfactant from anionic to nonionic, which fundamentally alters the chemical environment. This parameter change prevents the interaction between anionic surfactants and copper-containing dye components that causes browning, thereby maintaining both formulation stability and color brilliance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves brilliant, fashionable copper shades with enhanced color richness and wash fastness by minimizing anionic surfactant content, preventing the unwanted shift towards brown tones and ensuring long-lasting results.
Implementation Method 1
oxidative color-changing agents... oxidation dyes are used. Such coloring agents customarily include oxidation dye precursors, so-called developer components and coupler components, which form the actual dyes with one another under the influence of oxidizing agents
Implementation Method 2
one or more nonionic surfactants... total content of all anionic surfactants (E) included in the agent is below 0.6 wt %
Data Source
AI summary
An agent for oxidatively dyeing keratinous fibers, in particular human hair, includes —in a cosmetic carrier—(A) 1-(2-hydroxyethyl)-4,5-diamino pyrazole and/or a physiologically acceptable salt thereof,(B) 2,6-dihydroxy-3,4-dimethylpyridine,(C) hydrogen peroxide, and(D) one or more nonionic surfactants,wherein the total content of all anionic surfactants (E) included in the agent is below 0.6 wt %, based on the total weight of the agent.A second subject matter of the present invention is a corresponding multicomponent packaging unit (kit-of-parts).