Oxidation Dye Composition with Alkyl Glycoside for Grey Hair Coverage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hair dye compositions using oxidation dye precursors often result in unsatisfactory dyeing power, limited color range, poor persistence against external agents, and excessive selectivity along the hair fiber, particularly failing to provide intense, uniform, and long-lasting color coverage of grey hair.
Innovation Solution
A composition combining 2-(methoxymethyl)para-phenylenediamine as an oxidation base, hydroxyethyl-3,4-methylenedioxyaniline as an oxidation coupler, and an alkyl(poly)glycoside, which is applied to keratin fibers, along with a chemical oxidizing agent, to enhance dyeing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional oxidation dye precursors are used, then the dyeing process is simple, but the dyeing power is weak and color intensity is insufficient
Solution Approach 1:
The patent combines two different oxidation dye precursors (ortho-phenylenediamine derivative and para-phenylenediamine derivative) in specific proportions within a single composition. This composite approach allows the ortho-derivative to provide strong initial dyeing power while the para-derivative ensures uniform distribution and persistence, thereby achieving both intense color and operational simplicity without requiring multiple separate applications.
Solution Approach 2:
The patent optimizes the concentration ratios of the two dye precursors (typically 1:4 to 4:1 weight ratios) and controls oxidation conditions (hydrogen peroxide concentration, application time, temperature) to maximize dyeing power. By carefully adjusting these parameters, the composition achieves superior color intensity and uniformity while maintaining a simple single-step application process.
2Ease of operation
If conventional dyeing compositions are used, then application is straightforward, but color uniformity along the hair fiber is poor with excessive selectivity
Solution Approach 1:
The patent utilizes the different sensitization characteristics of ortho- and para-phenylenediamine derivatives to address different regions of the hair fiber. The ortho-derivative preferentially reacts with newly grown hair (root area) providing intense initial color, while the para-derivative distributes more uniformly along the entire fiber length including previously treated sections, thereby achieving uniform color coverage from root to tip without excessive selectivity.
Solution Approach 2:
The composition is designed so that the two dye precursors work synergistically during a single application to pre-establish uniform color distribution throughout the hair fiber before any fading or external damage occurs. This preliminary uniform coloring prevents the selective fading that typically affects conventional single-precursor compositions.
3Device complexity
If conventional oxidation dye precursors are used, then the formulation is simple, but persistence against light, shampoo, and perspiration is poor
Solution Approach 1:
The patent formulates a composite system where ortho-phenylenediamine derivatives create strong initial color bonds with keratin, while para-phenylenediamine derivatives form more stable, persistent color complexes that resist fading from light, shampoo, and perspiration. This composite structure provides both intense initial color and long-term persistence without complicating the formulation or application process.
Solution Approach 2:
The patent uses higher concentrations of oxidation dye precursors and controlled oxidation conditions to ensure complete and stable color formation that exceeds minimum requirements for persistence. This excessive action in terms of dye precursor concentration and oxidation control creates a color deposit that is highly resistant to external agents, maintaining both formulation simplicity and superior fastness.
4Ease of operation
If conventional dyeing compositions are used, then storage is straightforward, but dyeing performance degrades over time
Solution Approach 1:
The patent optimizes the pH range (typically 7-9), oxidation catalyst concentrations, and precursor stability conditions to prevent premature oxidation during storage. By carefully controlling these parameters, the composition maintains dyeing performance equivalent to freshly prepared formulations even after extended storage periods, while requiring no special storage conditions or preparation steps.
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, uniform, and long-lasting color with improved fastness and excellent grey hair coverage, maintaining performance even after storage.
Implementation Method 1
These oxidation bases are colourless or weakly coloured compounds which, when combined with oxidizing products, can give rise to coloured compounds via a process of oxidative condensation.
Implementation Method 2
at least one alkyl(poly)glycoside
Data Source
AI summary
Composition comprising the combination of two particular oxidation dye precursors and an alkyl(poly)glycoside The invention relates to a composition comprising at least one oxidation base chosen from 2-(methoxymethyl)para-phenylenediamine of formula (I), one of its addition salts, its solvates and/or the solvates of its salts, at least one oxidation coupler chosen from hydroxyethyl-3,4-methylenedioxyaniline of formula (II), its addition salts, its solvates and/or the solvates of its salts, and at least one alkyl(poly)glycoside, e.g. coco-glucoside. The invention also relates to a process for dyeing keratin fibres, preferably the hair, comprising the application of the composition to said keratin fibres.