Amphoteric Surfactant-Dye Complex for Hair Color Fastness
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Solution Overview
Problem
Current hair dyes, particularly direct dyes, face challenges in achieving uniform and long-lasting color on hair with varying degrees of damage, as they often result in uneven coloring and rapid discoloration due to insufficient fastness properties, especially when exposed to washing and external influences like sunlight or swimming pool water.
Innovation Solution
A hair dye formulation combining cationic anthraquinone dyes with amphoteric surfactants, specifically alkyl amphodiacetate and/or alkyl amphodipropionate, which provides improved fastness and leveling properties, ensuring consistent color retention even after repeated washing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If direct dyes are used for hair coloring, then the coloring process is gentler on the fiber, but the fastness properties are insufficient especially against washing and external influences
Solution Approach 1:
The patent combines direct dyes with amphoteric surfactants to create a composite coloring composition. The amphoteric surfactant forms a complex with the direct dye on the hair fiber, creating a composite structure that enhances fastness properties while maintaining the gentleness of direct dyeing. This composite approach allows the dye-surfactant complex to resist washing and external influences better than direct dyes alone.
Solution Approach 2:
The amphoteric surfactant acts as an intermediary between the direct dye and the hair fiber. It facilitates the deposition of the dye onto the fiber while providing additional functionality through its surfactant properties. The surfactant mediates the interaction between the dye and fiber, improving adhesion and fastness without requiring harsh oxidizing agents.
2Ease of operation
If direct dyes are used, then the application conditions are gentler, but the dyes are much more sensitive to shampooing causing rapid discoloration
Solution Approach 1:
The patent creates a composite system where direct dyes are combined with amphoteric surfactants. This composite structure on the hair fiber provides both the ease of direct dye application and improved resistance to shampooing. The surfactant component of the composite binds to the fiber and anchors the dye, reducing sensitivity to washing.
3Device complexity
If direct dyes are applied to pre-treated hair with varying damage, then the coloring process is simpler, but uneven coloring occurs due to varying degrees of damage at different areas
Solution Approach 1:
The amphoteric surfactant in the composition provides local adaptation to different hair conditions. It can interact with varying degrees of fiber damage at different areas, adjusting its binding characteristics locally. This allows uniform color distribution even on pre-treated hair with varying damage, as the surfactant-dye complex adapts to local fiber properties.
Solution Approach 2:
The patent utilizes changes in the physical-chemical parameters of the dyeing composition by incorporating amphoteric surfactants. These surfactants can change their behavior based on local conditions (pH, ionic strength, fiber condition), allowing the composition to adapt to varying hair damage levels and achieve uniform coloring without complex processing 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 combination of cationic anthraquinone dyes with amphoteric surfactants results in brilliant, intensive, and uniform color that maintains its fastness and shine, addressing the issues of uneven coloring and rapid discoloration associated with traditional hair dyes.
Implementation Method 1
combinations of certain cationic anthraquinones as direct dyes with certain amphoteric surfactants lead to colorations that solve the task to an outstanding degree
Data Source
AI summary
The invention relates to a substance for dyeing keratin fibers, containing (a) at least one compound of formula (I), and (b) at least one amphoteric surfactant.