Hair Dye Composition Using Reducing Agent for Homogeneous Color
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Solution Overview
Problem
Existing hair dye compositions based on direct dyes face challenges in achieving homogeneous and long-lasting color, especially on damaged hair, due to differential dye uptake properties, leading to consumer dissatisfaction.
Innovation Solution
A two-part aqueous hair dye composition comprising selected direct dyes and a reducing agent, where part A contains the dyes and part B contains the reducing agent, are mixed just before application, with part B applied first and part A left on the hair for 1 to 45 minutes before rinsing, to enhance color intensity and homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If direct dyes are used to color hair, then color intensity is improved, but color homogeneity deteriorates
Solution Approach 1:
A reducing agent is introduced as an intermediary substance that modifies the hair structure before dye application. The reducing agent opens the hair cuticle and swells the cortex, creating a more uniform substrate for dye penetration. This mediator enables both intensive and homogeneous coloring by preparing the hair to receive dye molecules evenly across different hair zones.
Solution Approach 2:
The reducing agent is applied to the hair before the direct dye to pre-condition the hair structure. This preliminary action of cuticle opening and cortex swelling occurs first, creating optimal conditions for subsequent uniform dye uptake. The two-step sequence ensures that when dye is applied, it penetrates homogeneously while achieving high intensity.
2Illumination intensity
If direct dyes are used to color hair, then color intensity is improved, but color durability deteriorates
Solution Approach 1:
The reducing agent serves as a mediator that creates stronger anchoring sites within the hair cortex. By modifying the hair structure through reduction, it enables direct dyes to penetrate deeper and bind more牢固ly to hair proteins. This intermediary action transforms the hair-dye interface to achieve both high intensity and long-lasting durability.
Solution Approach 2:
The reducing agent changes the chemical parameters of the hair structure by breaking disulfide bonds and altering the protein matrix. This parameter change in hair structure creates a more receptive environment for dye molecules, allowing them to penetrate more deeply and bind more strongly, thereby extending color durability while maintaining intensity.
3Quantity of substance
If direct dyes are applied to damaged hair, then color uptake varies, but color homogeneity deteriorates
Solution Approach 1:
The reducing agent applies different local actions to different hair zones based on their damage levels. In heavily damaged areas, it creates more extensive cuticle opening and cortex swelling to accommodate higher dye uptake. In less damaged areas, it provides moderate preparation. This localized adaptation ensures uniform color distribution across the entire head of hair despite varying damage levels.
Solution Approach 2:
The reducing agent dynamically adjusts the hair structure parameters (cuticle opening degree, cortex swelling extent) based on local hair condition. This parameter modification creates a more uniform effective substrate across damaged and undamaged hair zones, enabling homogeneous dye uptake despite initial structural differences.
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 more intense and long-lasting hair color, ensuring better homogeneity and durability, particularly on damaged hair, compared to prior art methods.
Implementation Method 1
a two-part aqueous hair dying composition comprising the parts A and B which are mixed prior to application onto hair wherein the part A is an aqueous composition comprising one or more dyes selected form the above given dyes and the part B is an aqueous composition comprising one or more reducing agent
Data Source
AI summary
The present invention relates to a hair dyeing composition comprising select hair direct dyes and a reducing agent in order to color hair homogeneously, intensively and durably.