Alkaline Microemulsion for Removing Persistent Dye from Keratin Fibres
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Solution Overview
Problem
Current methods lack efficiency in removing persistent temporary dye compositions from keratin fibers, particularly those that resist shampoo washing, leading to challenges in maintaining hair hygiene and color uniformity.
Innovation Solution
A process involving a makeup-removing composition in microemulsion form, containing a silicone of specific formula and an alkaline agent, along with a surfactant content of at least 30% by weight, is applied to keratin fibers to effectively remove dye compositions comprising pigments or direct dyes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a temporary dye composition is applied to keratin fibres, then colour uniformity is improved, but the dye becomes persistent and difficult to remove
Solution Approach 1:
The invention changes the chemical parameters of the dye composition by incorporating specific silicone compounds (polydimethylsiloxane with molecular weight 500-5000) alongside traditional direct dyes. This parameter change in composition allows the dye to maintain uniform coloration while becoming removable through alkaline agents, thus resolving the contradiction between color uniformity and ease of removal
Solution Approach 2:
The invention creates a composite dyeing system combining silicone compounds (polydimethylsiloxane) with direct dyes. This composite material approach allows the dye composition to achieve both uniform color distribution through the silicone's film-forming properties and removability through the specific interaction of the dye components with alkaline agents
2Reliability
If conventional shampoo washing is used, then hair hygiene is maintained, but persistent dye compositions are not removed
Solution Approach 1:
The invention introduces a dynamic, multi-stage cleaning approach where the first stage uses conventional shampoo for general hygiene, and the second stage uses an alkaline makeup-removing composition specifically for dye removal. This dynamic process adaptation allows both hygiene maintenance and effective dye removal to be achieved sequentially
Solution Approach 2:
The invention uses an alkaline agent (such as sodium hydroxide, potassium hydroxide, or triethanolamine) as an intermediary substance that specifically targets and breaks down the persistent dye composition without interfering with the primary shampooing function. This intermediary enables selective dye removal while preserving the hygiene-maintaining function of regular shampoo
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 ensures efficient removal of persistent dye compositions, improving hair hygiene and maintaining color uniformity by using a microemulsion-based composition with a high surfactant content and specific silicone and alkaline agents.
Implementation Method 1
at least one surfactant in a content of greater than or equal to 30% by weight relative to the total weight of the makeup-removing composition
Implementation Method 2
said makeup-removing composition comprising at least one alkaline agent
Implementation Method 3
A process involving a makeup-removing composition in microemulsion form
Data Source
AI summary
The present invention relates to a process for treating keratin fibres, in particular the hair, comprising the application of at least one makeup-removing composition to said keratin fibres, which have been dyed beforehand using at least one dye composition comprising at least one particular silicone of formula (I) and at least one colouring agent chosen from pigments, direct dyes and mixtures thereof, said makeup-removing composition comprising a) at least one alkaline agent.