pH-Controlled Hair Dyeing Method for Uniform Color and Reduced Damage
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Solution Overview
Problem
Current hair dyeing methods using oxidative dyes, particularly level 3 products, cause significant hair damage due to high ammonia content, and result in uneven dyeing and color shifts when diluted with conditioners or shampoos, which affect the desired shade and hair health.
Innovation Solution
A method involving two distinct hydrogen peroxide preparations with different pH levels, applied in sequence to the hair anchor point and shaft/tips, allows for flexible and controlled reduction of dye concentration, maintaining shade consistency and minimizing hair damage by adjusting pH values in the dye mixtures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high ammonia content is used in level 3 oxidative dyes, then gray coverage capability and dyeing stability are improved, but hair damage increases substantially
Solution Approach 1:
The patent changes the pH parameter of the hydrogen peroxide preparation from conventional values to a range of 1.0-2.8, which fundamentally alters the dyeing mechanism to achieve gray coverage without substantial hair damage. This parameter change allows the oxidative dye to function effectively at lower ammonia concentrations.
Solution Approach 2:
The patent applies different pH levels of hydrogen peroxide preparations to different hair regions (anchor points versus shaft/tips) to address local variations in hair condition and dyeing needs, optimizing both gray coverage and hair health for each specific area.
2Ease of operation
If level 3 oxidative dyes are diluted with conditioners or shampoos, then application ease is improved, but color consistency deteriorates due to color shifts
Solution Approach 1:
The patent extracts the oxidizing function from conventional alkaline conditioner/shampoo systems and replaces it with a specifically formulated low-pH hydrogen peroxide preparation, eliminating the harmful interaction between high pH and oxidative dye that causes color shifts.
Solution Approach 2:
The low-pH hydrogen peroxide preparation acts as an intermediary substance that enables the dyeing process without causing the adverse chemical reactions that occur between conventional high-pH conditioners/shampoos and oxidative dyes, thus maintaining color consistency.
3Object-affected harmful factors
If ammonia content is reduced in oxidative dyes, then hair damage is minimized, but gray coverage capability and dyeing stability deteriorate
Solution Approach 1:
The patent fundamentally changes the pH parameter of the oxidizing agent to 1.0-2.8, which alters the chemical mechanism of the dyeing process to achieve effective gray coverage without requiring high ammonia concentrations, thus minimizing hair damage.
Solution Approach 2:
The patent creates a composite dyeing system combining oxidation dye precursors with low-pH hydrogen peroxide preparation and specific conditioning agents, which together provide both gray coverage capability and hair protection that neither component could achieve alone.
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
This method enables the creation of a level 2 product from a level 3 product, reduces hair damage, and achieves uniform dyeing without color shifts, allowing for customizable dye application based on hair damage levels, thus enhancing hair health and color consistency.
Implementation Method 1
oxidative color changing agents are used... oxidation dyes... contain oxidation dye precursors... which combine to constitute the actual coloring agents under the effects of the oxidizing agents
Implementation Method 2
high ammonia content in the colorations, which causes the hair to swell significantly and consequently allows the oxidation dye precursors to diffuse into the hair at a high rate
Implementation Method 3
allows the oxidation dye precursors to diffuse into the hair at a high rate
Data Source
AI summary
The object of the present disclosure is a method for dyeing human hair which is adapted to the differing degrees of damage along the length of the hair fiber and achieves more homogenous coloring results.