Hair Dye Composition Using Alternative Oxidation Bases
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Solution Overview
Problem
Existing hair dye compositions using para-phenylenediamine oxidation bases face challenges in achieving uniform, intense, and long-lasting color coverage, especially for grey hair, while also posing inconveniences such as strong odors and potential scalp irritation due to the use of oxidizing agents like hydrogen peroxide and alkaline agents.
Innovation Solution
A composition comprising 3-(2,5-diaminophenyl)-1-propanol or its acid salts, combined with para-aminophenol, 3-methyl-4-aminophenol, and N,N-bis(β-hydroxyethyl)-para-phenylenediamine, along with a coupler and a fatty substance, optionally including a basifying agent and chemical oxidizing agent, to enhance dyeing properties and reduce malodorous and irritating effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If oxidizing agents and alkaline agents are used to achieve intense and uniform coloration, then dyeing power and color uniformity are improved, but fiber degradation and user inconvenience (odour and irritation) increase
Solution Approach 1:
The invention changes the chemical parameters by using alternative oxidation bases (para-aminophenol, 3-methyl-4-aminophenol, N,N-bis(β-hydroxyethyl)-para-phenylenediamine) that require milder oxidation conditions, thereby achieving intense coloration with reduced fiber degradation
Solution Approach 2:
The invention introduces intermediary substances (fatty substances and specific oxidation bases) that mediate between the oxidizing agent and the keratin fiber, allowing effective coloration while protecting the fiber from excessive degradation
2Power
If oxidizing agents and alkaline agents are used to achieve intense and uniform coloration, then dyeing power and color uniformity are improved, but user inconvenience (odour and irritation) increase
Solution Approach 1:
The invention changes the chemical composition parameters by selecting oxidation bases with inherently lower odour and irritation potential, and using fatty substances to further reduce malodorous effects during application
Solution Approach 2:
The invention converts the potentially harmful strong odour and irritation of traditional oxidation dyeing into a beneficial mild formulation by using alternative oxidation bases and fatty substances that eliminate the harmful effects while maintaining dyeing efficacy
3Device complexity
If existing para-phenylenediamine oxidation bases are used, then dyeing process is simple, but color uniformity and grey hair coverage are insufficient
Solution Approach 1:
The invention uses composite oxidation base formulations combining para-aminophenol, 3-methyl-4-aminophenol, and N,N-bis(β-hydroxyethyl)-para-phenylenediamine with couplers and fatty substances to achieve superior color uniformity and grey hair coverage while maintaining process simplicity
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 superior dyeing properties with uniform color from roots to ends, improved lightening, and stability against external factors, while minimizing odor and irritation risks, without increasing the amount of oxidizing or basifying agents.
Implementation Method 1
The role of this oxidizing agent is to at least partly degrade the melanin of the hair, which, depending on the nature of the oxidizing agent present, leads to more or less pronounced lightening of the fibres
Implementation Method 2
The basifying agent makes it possible to adjust the pH of the composition to an alkaline pH to enable activation of the oxidizing agent
Implementation Method 3
In addition, this basifying agent causes swelling of the keratin fibre, with raising of the scales, which promotes the penetration of the oxidizing agent, and also of the dyes, if they are present, essentially oxidation dyes, into the fibre
Implementation Method 4
These oxidation bases are colourless or weakly coloured compounds, which, when combined with oxidizing products, may give rise to coloured compounds via a process of oxidative condensation
Data Source
AI summary
The present invention relates to a composition for dyeing keratin fibres, in particular keratin fibres such as the hair, comprising: at least one oxidation base 3-(2,5-diaminophenyl)-1-propanol and/or acid salts thereof or solvates thereof; at least one oxidation base chosen from para-aminophenol, 3-methyl-4-aminophenol and N,N-bis(3-hydroxyethyl)-para-phenylenediamine, addition salts thereof, solvates thereof, and mixtures thereof; at least one coupler; optionally at least one fatty substance; optionally at least one basifying agent; and optionally at least one chemical oxidizing agent. The invention also relates to a process for dyeing keratin fibres such as the hair using the composition of the invention, and to a multi-compartment device for using the composition of the invention.