Solid Reducing Agent Kit for Stable Hair Decolorization
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Solution Overview
Problem
Existing methods for reductive decolorization of dyed keratin fibers face challenges with the stability and solubility of reducing agents, particularly formamidine sulfinic acid, which is unstable in aqueous solutions and has poor water solubility, leading to limited storage stability and effectiveness.
Innovation Solution
A multi-component packaging unit comprising two separate containers, one with a solid reducing agent and oxidant, and the other with an alkalizing agent, where the agents are mixed to form a ready-to-use decolorizing agent, ensuring stability and effective dissolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If formamidine sulfinic acid is used as a reducing agent in aqueous solution, then the decolorization effect is achieved, but the solution is unstable and has poor storage stability
Solution Approach 1:
The patent divides the reducing agent system into two separate components: formamidine sulfinic acid (solid, storage-stable) and an alkalizing agent (aqueous solution). These are kept separate during storage and only mixed upon application, allowing both components to maintain their stability while achieving the necessary decolorization effect when combined.
Solution Approach 2:
The patent changes the physical state of the reducing agent from aqueous solution to solid form, which significantly improves storage stability. The solid formamidine sulfinic acid can be stored indefinitely without degradation, and only dissolves upon contact with the alkalizing agent during use.
2Quantity of substance
If formamidine sulfinic acid is used as a reducing agent, then the decolorization effect is achieved, but the water solubility is poor
Solution Approach 1:
The patent introduces an alkalizing agent as an intermediary substance that facilitates the dissolution of formamidine sulfinic acid. When the alkalizing agent is added to the solid reducing agent, it triggers exothermic dissolution, making the previously insoluble formamidine sulfinic acid soluble and active in the decolorization process.
Solution Approach 2:
The patent utilizes phase transition from solid to liquid/dissolved state through exothermic dissolution. The solid formamidine sulfinic acid undergoes phase change upon contact with the alkalizing agent, transitioning from an insoluble solid to a soluble active form, thereby improving ease of use while maintaining effectiveness.
3Reliability
If strong oxidants are used for decolorization, then the decolorization effect is achieved, but the fibres are damaged
Solution Approach 1:
The patent inverts the traditional approach by using reduction instead of oxidation for decolorization. Instead of employing strong oxidants that damage fibres, the system uses formamidine sulfinic acid as a reducing agent that gently removes dye without compromising fibre integrity, thereby achieving decolorization effectiveness while eliminating fibre damage.
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 solution provides a stable and effective ready-to-use decolorizing agent that maintains high decolorizing power even after long storage periods, with improved solubility and ease of use, addressing the limitations of previous formulations.
Implementation Method 1
the decolourisation effect is achieved by reducing the dyes located on the keratin fibres and/or hair. As a result of the reduction process the dyes are generally converted to their reduced leuco forms. This method involves reducing the double bonds present in the dyes, thus interrupting the chromophoric system of the dyes and converting the dye into a colourless form.
Implementation Method 2
When the reducing agent and the oxidant are mixed, an exothermic reaction takes place, which enhances the dissolution of the reducing agent and accelerates the decolourisation process.
Data Source
AI summary
The present disclosure relates to multi-component packaging units (kits-of-parts), ready-to-use agents, and methods for reductive decolourisation of dyed keratinous fibres. In one example, the multi-component packaging unit (kit-of-parts) for reductive decolourisation of dyed keratinous fibres includes,(I) a first container (A) including a cosmetic agent (a) and(II) a second container (B) including a cosmetic agent (b),whereinthe first container (A) and the second container (B) are provided separately from one another,the cosmetic agent (a) in the first container (A) includes(a1) one or more reducing agent(s) that is/are solid at room temperature, and(a2) one or more oxidant(s) that is/are solid at room temperature, and wherein the cosmetic agent (b) in the second container (B) comprises(b1) one or more alkalising agent(s).