Oxidative Hair Dye Composition for Gray Coverage
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Solution Overview
Problem
Current oxidative hair dyes struggle to achieve optimal gray coverage and wash fastness, particularly for red, violet, and bright copper nuances, which are not adequately addressed by existing formulations.
Innovation Solution
A combination of 1-(2-hydroxyethyl)-4,5-diaminopyrazole, 2,6-dihydroxy-3,4-dimethylpyridine, toluene-2,5-diamine, and resorcinol or its derivatives in a cosmetic carrier is used to create an oxidative dyeing agent that enhances gray coverage and wash fastness of keratin fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional oxidative dyes are used, then the hair color can be changed to red, violet, or copper nuances, but the gray coverage is insufficient and wash fastness is poor
Solution Approach 1:
The patent uses a composite dye formulation containing four specific components: 1-(2-hydroxyethyl)-4,5-diaminopyrazole, 2,6-dihydroxy-3,4-dimethylpyridine, toluene-2,5-diamine, and resorcinol or its derivatives. This composite approach combines multiple dye precursors and couplers that work synergistically to achieve both bright copper shades and superior gray coverage, resolving the contradiction between color quality and performance reliability.
Solution Approach 2:
The patent optimizes specific chemical parameters including the molecular structure of each dye component, their concentration ratios, and the pH range (8.0-10.5) of the cosmetic carrier. These parameter changes enable the dye system to penetrate gray hair effectively while maintaining color stability during washing, thus improving gray coverage and wash fastness without excessive formulation complexity.
2Reliability
If direct dyes are used, then the hair color can be temporarily changed with minimal damage, but the durability and wash fastness are low
Solution Approach 1:
The patent employs oxidative dye precursors that are converted into permanent color molecules during the dyeing process. The precursor molecules penetrate the hair shaft and undergo oxidation to form large, stable dye molecules that are locked within the hair structure. This preliminary chemical transformation ensures long-lasting color that resists washing, achieving high reliability while maintaining reasonable process simplicity.
3Reliability
If oxidative dyes are used to achieve bright copper nuances, then long-lasting color is obtained, but the authenticity properties and gray coverage are not optimal
Solution Approach 1:
The patent tailors the dye formulation to specifically address gray hair characteristics. The combination of 1-(2-hydroxyethyl)-4,5-diaminopyrazole with 2,6-dimethyl-pyridine and resorcinol derivatives creates dye molecules with enhanced affinity for the melanin-deficient structure of gray hair. This localized optimization for gray hair coverage allows effective coloring without requiring excessive dye concentrations, maintaining efficiency while improving performance.
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 agent provides superior gray coverage and improved wash fastness for keratin fibers, particularly for red, violet, and bright copper shades, ensuring minimal color change even after repeated washing.
Implementation Method 1
oxidation dye precursors, so-called developer components and coupler components, which form the actual dyes under the influence of oxidizing agents
Data Source
AI summary
The invention relates to products for the oxidative dyeing of keratin fibers, containing, in a cosmetic carrier, (A) 1-(2-hydroxyethyl)-4,5-diaminopyrazole and/or one of its physiologically acceptable salts, and (B) 2,6-dihydroxy-3,4-dimethylpyridine, and (C) p-phenylene diamine, toluene-2,5-diamine, 2-(2,5-diaminophenyl) ethanol and/or one of its physiologically acceptable salts.