Oxidation Hair Dye Composition for Uniform Grey Coverage
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Solution Overview
Problem
Existing hair dye compositions using oxidation dye precursors often result in unsatisfactory dyeing power, limited color range, poor fastness to external agents, and uneven color distribution along the hair shaft.
Innovation Solution
A composition comprising 2-methoxymethyl-para-phenylenediamine as an oxidation base, 6-hydroxybezomorpholine as an oxidation coupler, an amphoteric or zwitterionic surfactant, and a solid fatty substance, which when combined with a chemical oxidizing agent, provides intense, uniform, and long-lasting color with good grey hair coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional oxidation dye compositions are used, then the dyeing process is simple, but the dyeing power is weak and color range is limited
Solution Approach 1:
The patent uses a composite dyeing system combining two specific oxidation bases (2-methoxymethyl-para-phenylenediamine and another para-phenylenediamine derivative) with specific couplers, creating a composite material that achieves superior dyeing power while maintaining process simplicity. This composite approach allows the formulation to overcome the limitations of single-component systems.
2Ease of operation
If conventional oxidation dye compositions are used, then the application process is straightforward, but the fastness to external agents is poor
Solution Approach 1:
The patent modifies the chemical parameters of the dyeing system by selecting specific oxidation bases with particular molecular structures and combinations. The use of 2-methoxymethyl-para-phenylenediamine with specific couplers creates more stable colored compounds that resist fading from light, shampoo, and perspiration, while keeping the application process unchanged.
3Device complexity
If conventional oxidation dye compositions are used, then the formulation is simple, but the color distribution along the hair shaft is uneven
Solution Approach 1:
The patent employs a dual oxidation base system where each component contributes differently to the overall dyeing performance. The specific combination of 2-methoxymethyl-para-phenylenediamine with another para-phenylenediamine derivative creates complementary effects that ensure uniform penetration and distribution along the entire hair shaft, from root to tip, while maintaining formulation 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 powerful, intense, and sparingly selective colorings with uniform distribution and excellent coverage of depigmented areas, offering a wide range of shades and improved fastness to external agents.
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.
Data Source
AI summary
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 6-hydroxybenzomorpholine of formula (II), one of its addition salts, its solvates and/or the solvates of its salts, at least one amphoteric or zwitterionic surfactant, and at least one solid fatty substance. The invention also relates to a process for dyeing keratin fibers, preferably the hair, comprising the application of the composition to said keratin fibers.