Hair Coloring Agent Composition with pH Adjustment
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Solution Overview
Problem
Hair coloring compositions containing para-phenylenediamine can cause skin disorders and are difficult to apply, especially for dark black colors, due to high diamine compound amounts and poor adhesion to the scalp, leading to challenges in removal and color retention.
Innovation Solution
A hair coloring agent composition comprising basic dye, HC dye, amino acid, cationic surfactant, thickener, oil agent, pH adjusting agent, and thioglycolic acid or its derivatives, with a pH of 3.5 or higher, which allows for deep penetration and long-lasting color without para-phenylenediamine, reducing skin disorders and adhesion issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If para-phenylenediamine (oxidative dye) is used for hair coloring, then color intensity is improved, but skin disorders occur due to high diamine compound amounts
Solution Approach 1:
The invention removes para-phenylenediamine and other problematic diamine compounds from the hair coloring composition while maintaining effective color deposition through alternative dye mechanisms that do not rely on oxidative coupling of diamines
Solution Approach 2:
The invention changes the chemical composition parameters by substituting para-phenylenediamine with alternative coloring agents and adjusts the pH parameter to 3.5 or higher to enable effective hair coloring without harmful diamine compounds
2Duration of action of stationary object
If semi-permanent hair dye is applied for long duration to improve penetration, then color retention is improved, but removal difficulty increases and scalp adhesion problems occur
Solution Approach 1:
The invention optimizes the pH parameter to 3.5 or higher, which enables effective cuticle opening and dye penetration within a shorter time frame, eliminating the need for prolonged application while maintaining good color retention and facilitating easier removal
3Quantity of substance
If para-phenylenediamine-based hair coloring composition is used, then color depth is improved, but application safety deteriorates due to skin contact risks
Solution Approach 1:
The invention extracts and eliminates para-phenylenediamine and other sensitizing diamine compounds from the composition, replacing them with safer alternative coloring agents that provide comparable color depth without skin contact risks
Solution Approach 2:
The invention introduces pH adjusting agents and other auxiliary components that mediate the coloring process, enabling effective color deposition through alternative mechanisms that do not require harmful diamine compounds while maintaining application safety
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 a safe, long-lasting hair color with good penetration and reduced risk of skin disorders, allowing for easy application and removal, even on hard-to-reach areas like the hairline, while maintaining color retention and minimizing hair damage.
Implementation Method 1
containing at least one selected from the group consisting of thioglycolic acid, cysteine, 3-mercapto-1,2-propanediol, cysteamine, and derivatives and salts thereof
Implementation Method 2
comprising basic dye, HC dye, an amino acid
Implementation Method 3
comprising basic dye, HC dye, an amino acid, a cationic surfactant
Data Source
AI summary
A hair coloring composition may include at least one selected from the group consisting of thioglycolic acid, cysteine, 3-mercapto-1,2 - propanediol, cysteamine, derivatives and salts thereof, and a basic dye, a HC dye, an amino acid, cationic surfactant, thickener, oil agent, pH adjuster, and wetting agent, wherein the pH of the hair coloring agent composition is 3.5 or higher.