Oxidative Hair Dye Composition for Persistent White Hair Coverage
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Solution Overview
Problem
Existing hair dye compositions using oxidation dye precursors fail to achieve intense, persistent, and non-selective coloration with good build-up and resistance to external factors such as washing, light, and perspiration, particularly affecting white hair coverage and color intensity.
Innovation Solution
A cosmetic composition comprising 6-hydroxybenzomorpholine, hydroxyethyl-3,4-methylenedioxyaniline, and N,N-dicarboxymethylglutamic acid, or their salts, combined with optional additional couplers and oxidizing agents, to enhance dyeing performance on keratin fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional oxidation dye precursors are used, then hair dyeing can be achieved, but the coloration lacks intensity and persistence especially on white hair
Solution Approach 1:
The patent combines multiple oxidation dye precursors (6-hydroxybenzomorpholine, hydroxyethyl-3,4-methylenedioxyaniline) with specific couplers (meta-diaminobenzenes, meta-aminophenols, meta-diphenols) and heterocyclic compounds to create a composite dyeing system. This composite approach synergistically enhances both color intensity and persistence, particularly on white hair, while maintaining acceptable dyeing efficiency.
2Reliability
If conventional dye compositions are used, then hair can be colored, but selectivity varies significantly between end and root of the same lock
Solution Approach 1:
The patent employs different oxidation dye precursors and couplers with varying molecular weights, solubilities, and reactivity profiles to achieve localized optimization. Lighter components penetrate the hair shaft uniformly from root to end, while heavier components provide persistent coloration at the root, creating a balanced color distribution that reduces selectivity differences.
3Adaptability or versatility
If conventional oxidation bases and couplers are combined, then a wide range of colors can be obtained, but color build-up is insufficient and coverage of white hair is poor
Solution Approach 1:
The patent merges oxidation dye precursors with direct dyes and basic dyes in a single composition. The oxidation components provide color variety through coupling reactions, while the direct and basic dyes contribute to rapid color build-up and excellent white hair coverage. This merging of different dyeing mechanisms achieves both color versatility and reliable performance.
4Reliability
If conventional dye compositions are used, then hair can be colored, but resistance to external factors such as washing, light, and perspiration is insufficient
Solution Approach 1:
The patent incorporates antioxidants and stabilizing agents in the dye composition to prevent premature oxidation and degradation of the dye precursors and couplers. These protective components are applied simultaneously with the dye, creating a protective environment that enhances color fastness against washing, light, and perspiration throughout the dyeing process and aftercare.
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 composition achieves intense, persistent, and non-selective coloration with improved resistance to external factors, ensuring good coverage and color intensity even after multiple shampooing operations.
Implementation Method 1
These oxidation bases are colourless or weakly coloured compounds, which, when combined with oxidizing products, are able to produce coloured compounds by a process of oxidative condensation.
Data Source
AI summary
A subject of the present invention is a cosmetic composition comprising 6-hydroxybenzomorpholine of formula (II), hydroxyethyl-3,4-methylenedioxyaniline of formula (III), at least one compound chosen from N,N-dicarboxymethylglutamic acid, its salts and mixtures thereof. The present invention also relates to a process for dyeing keratin fibres, such as the hair, wherein the composition as described previously is applied to said fibres. Another subject of the present invention is the use of the composition according to the invention for the cosmetic treatment of keratin fibres such as the hair.