Reductive Decolorizing Agent for Oxidative Hair Color Removal
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Solution Overview
Problem
Current reductive decolorization methods for oxidatively colored hair are limited in their ability to restore the hair to its original color effectively, often resulting in undesirable color shifts, damage to the hair structure, and require lengthy exposure times, with existing agents being opaque and difficult to monitor visually.
Innovation Solution
A reductive decolorizing agent is prepared by mixing an acidic, aqueous or aqueous-alcoholic solution with dithionite salts immediately before use, maintaining a pH of less than 5.0 and incorporating a thickener to ensure viscosity and transparency, allowing for effective and visible decolorization of keratin fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If oxidative decolorization is used to remove color from hair, then decolorization effectiveness is improved, but hair structure damage and brittleness increase
Solution Approach 1:
The patent changes the chemical parameter from oxidative to reductive decolorization, using dithionite salts as reducing agents. This fundamental parameter change allows effective color removal while preserving hair structure, as the reducing mechanism breaks down oxidative dye molecules without causing the structural damage associated with oxidative bleaching agents
Solution Approach 2:
The patent converts the previously harmful effect of strong oxidizing agents that caused hair damage into a beneficial reductive process. By using dithionite salts, the harmful oxidative stress on hair is replaced with a gentle reducing mechanism that achieves decolorization while protecting hair integrity
2Object-affected harmful factors
If reductive decolorization with dithionite salts is used, then hair structure damage is reduced, but decolorization performance is limited and exposure time increases
Solution Approach 1:
The patent optimizes the pH parameter of the reductive decolorization system, maintaining it between 4.0 and 6.0. This parameter optimization enhances the decolorization performance of dithionite salts while preserving hair structure, achieving faster and more effective color removal compared to conventional reductive methods
Solution Approach 2:
The patent uses composite formulations combining dithionite salts with specific carriers and conditioning agents. This composite approach enhances the decolorization performance by improving agent penetration and effectiveness while simultaneously protecting hair structure through the conditioning components
3Ease of operation
If thickening agents are added to reductive decolorizing agents to prevent runoff, then agent retention on hair is improved, but transparency and visual monitoring capability are reduced
Solution Approach 1:
The patent carefully controls the concentration and type of thickening agents to achieve optimal viscosity that prevents runoff while maintaining sufficient transparency. This parameter optimization allows the formulation to retain on hair effectively while still enabling visual monitoring of the decolorization progress
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 method significantly enhances decolorization performance, reduces hair damage, and allows for direct visual monitoring of the decolorization process, restoring the hair to its original color state while minimizing exposure time and maintaining hair integrity.
Implementation Method 1
Reductive decolorizing agents have less influence on the substrate structure, especially on the structure of keratin-containing fibers. The reductive decolorants hardly decolorize the natural hair color, but only have a reductive effect on the dyes applied by coloring.
Implementation Method 2
The structure of the substrate can be chemically changed due to the strong oxidizing effect of the oxidizing agent used for decolorization. This is accompanied by an undesirable physical change in the substrate.
Implementation Method 3
For this purpose, such agents are thickened accordingly and held at the site of action by the increased viscosity of the agents.
Implementation Method 4
For this purpose, it is particularly desirable that the decolorizing preparations applied to the fibers are transparent despite sufficient viscosity so that the color change can be determined immediately.
Data Source
AI summary
The invention relates to an agent for removing color from oxidatively dyed keratin fibers, which is obtained immediately before use by mixing a first aqueous or aqueous-alcoholic preparation (I) containing at least one mineral acid with a second preparation (II) containing at least one dithionite salt, wherein the agent ready for use has a pH value less than 5 and additionally contains a thickening agent.