pH-Controlled Hair Coloring Composition for Root-to-Tip Evenness
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Solution Overview
Problem
Existing hair dye compositions struggle with uneven color distribution from roots to tips, particularly on previously colored hair, and are often aggressive to the hair, leading to damage and unpredictable results due to varying damage levels among users.
Innovation Solution
A hair coloring composition is formulated by mixing a dye component and an oxidative component in a specific ratio, with controlled pH levels and the inclusion of chelating agents and buffering compounds to maintain natural strand-to-strand variation and enhance root-to-tip evenness, using ingredients like ammonia, chelants, and buffering agents to adjust pH from slightly alkaline to slightly acidic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the pH of hair coloring composition is lowered to make it milder to hair and scalp, then the aggressiveness to hair and scalp is reduced, but the uniformity of coloration deteriorates with excessive color uptake on damaged hair and insufficient color uptake on virgin hair
Solution Approach 1:
The patent applies parameter changes by using a pH-adjusting agent to precisely control the pH of the hair coloring composition within the range of 6.5 to 8.5. This optimized pH range resolves the contradiction by being mild enough to reduce aggressiveness to hair and scalp while maintaining sufficient coloration uniformity across different hair types, including virgin and previously damaged hair.
2Object-affected harmful factors
If the pH of hair coloring composition is lowered to reduce aggressiveness, then the mildness to hair is improved, but the predictability of color results deteriorates due to high variability driven by damage level differences
Solution Approach 1:
The patent uses parameter changes by optimizing the pH to a specific range (6.5-8.5) that reduces sensitivity to variations in hair damage levels. This creates more predictable and consistent color results across different users with varying hair conditions, while maintaining mildness to the hair.
3Quantity of substance
If conventional hair dye formulations are used to provide desired color shade and intensity, then the color saturation is improved, but the root-to-tip evenness deteriorates with tips appearing darker than roots
Solution Approach 1:
The patent applies parameter changes by controlling the pH within the optimized range of 6.5 to 8.5, which regulates the oxidation reaction rate and dye precursor diffusion. This ensures uniform color distribution from roots to tips while maintaining sufficient color intensity and saturation.
4Object-affected harmful factors
If the pH of hair coloring composition is adjusted to slightly alkaline or acidic ranges to be milder, then the scalp irritation is reduced, but the color uptake uniformity worsens with virtually no color uptake on virgin hair
Solution Approach 1:
The patent resolves this contradiction by optimizing the pH to a specific range (6.5-8.5) that balances mildness to the scalp with effective and uniform color uptake on virgin hair. This narrowed pH range ensures both scalp comfort and adequate color penetration.
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 provides desired color shade and intensity with enhanced root-to-tip evenness, even on previously colored and damaged hair, while being milder on the hair and scalp, preserving natural variations.
Implementation Method 1
A hair coloring composition is formulated by mixing a dye component and an oxidative component in a specific ratio, with controlled pH levels and the inclusion of chelating agents
Implementation Method 2
inclusion of chelating agents and buffering compounds to maintain natural strand-to-strand variation and enhance root-to-tip evenness
Implementation Method 3
a complex chemical process is sometimes utilized. Permanent hair dyeing formulations typically comprise oxidative hair dye precursors, which can diffuse into the hair through the cuticle and into the cortex where they can then react with each other and suitable oxidizing agents to form the end dye molecules
Implementation Method 4
oxidative hair dye precursors, which can diffuse into the hair through the cuticle and into the cortex
Data Source
AI summary
It is provided a kit for obtaining a hair coloring composition, a hair coloring composition, and a method for treating hair. The hair coloring composition particularly provides the desired color shade and intensity, together with an enhanced root to tip evenness on hair, particularly on previously colored hair and on hair with a broad range of damage levels along hair length.