Cationic Cellulose Ether Hair Dye Composition for Scalp Irritation Reduction
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Solution Overview
Problem
Existing hair dye compositions using oxidation dyes face challenges in achieving stable, nonselective, and long-lasting coloration on keratin fibers while minimizing scalp irritation and discomfort.
Innovation Solution
A composition combining cationic cellulose ethers and weakly oxyethylenated sorbitan fatty acid esters with oxidation dyes, which allows for the creation of stable, easy-to-apply creams that produce uniform, resistant, and nonselective colorations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oxidation dyes are used to achieve permanent coloration, then color strength and durability are improved, but scalp irritation and discomfort increase
Solution Approach 1:
The patent introduces weakly oxyethylenated sorbitan fatty acid esters as intermediary substances that mediate between the oxidation dye and the scalp. These esters reduce direct contact between the harsh dye components and the scalp, thereby decreasing irritation while maintaining coloration effectiveness through their ability to form protective films and enhance dye penetration control.
Solution Approach 2:
The patent modifies the chemical parameters of the dye composition by incorporating cationic cellulose ethers with specific degree of substitution and molecular weight ranges. These parameter changes alter the rheological properties and surface activity of the composition, enabling better distribution and reduced concentration at the scalp interface, thus maintaining color durability while reducing irritation.
2Reliability
If dye composition is made more aggressive to ensure strong coloration, then color intensity is improved, but ease of application deteriorates
Solution Approach 1:
The patent changes the rheological parameters of the dye composition by adding cationic cellulose ethers with specific viscosity characteristics. This modifies the flow and application properties of the composition, making it easier to apply while maintaining color intensity through controlled penetration and distribution mechanisms.
Solution Approach 2:
The weakly oxyethylenated sorbitan fatty acid esters act as intermediaries that facilitate smooth application by reducing surface tension and improving wetting properties, allowing the dye to spread evenly without requiring aggressive application forces while still achieving intense coloration.
3Ease of manufacture
If dye composition is simplified for easy preparation, then ease of manufacture is improved, but color uniformity deteriorates
Solution Approach 1:
The patent merges multiple functional components (cationic cellulose ether, weakly oxyethylenated sorbitan fatty acid ester, and oxidation dye) into a single integrated composition that achieves both ease of preparation and color uniformity. The synergistic interaction between these components allows for simplified manufacturing while maintaining uniform coloration through improved distribution and penetration characteristics.
4Ease of operation
If conventional dye compositions are used, then ease of operation is maintained, but color nonselectivity deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the dye composition by incorporating cationic cellulose ethers with specific degree of substitution and molecular weight. These parameter changes improve the selectivity of the dye for damaged keratin regions while maintaining ease of operation through preserved rheological properties and application characteristics.
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 results in stable hair dye compositions that provide uniform, long-lasting color with improved rheological properties, reducing scalp irritation and ensuring consistent coloration across the hair fiber.
Implementation Method 1
a composition combining cationic cellulose ethers and weakly oxyethylenated sorbitan fatty acid esters with oxidation dyes, which allows for the creation of stable, easy-to-apply creams
Implementation Method 2
These oxidation bases are colourless or weakly coloured compounds which, when combined with oxidizing products, can produce coloured compounds via a process of oxidative condensation
Implementation Method 3
The use of weakly oxyethylenated sorbitan fatty acid esters in oxidation dyeing compositions for keratin fibres is known in particular, through Patent Application DE-A-19923438, to reduce staining of the scalp during dyeing
Data Source
AI summary
The present invention relates to a dye composition comprising, in a medium suitable for dyeing: A) one or more particular cationic cellulose ether(s), B) one or more weakly oxyethylenated sorbitan fatty acid ester(s), and C) one or more oxidation dye(s). The present invention also relates to a process for dyeing keratin fibres using such a composition, and also to the use of this composition for dyeing keratin fibres.