Cationic Polymeric Hair Dyes Without Oxidizing Agents
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Solution Overview
Problem
Current hair dyes, particularly oxidative dyes, often cause skin irritation, allergenic properties, and damage to hair, and require chemical reactions and longer application times, limiting their effectiveness and safety.
Innovation Solution
Development of cationic polymeric dyes with a specific molecular structure that can be used without oxidizing agents, allowing for easier application and reduced damage, with a hue value of 210° to 330°, suitable for dyeing keratin-containing fibers and other organic materials, and can be combined with other dyes for enhanced color options.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If oxidative dyes are used for hair coloring, then color depth and permanence are improved, but skin irritation and allergenic properties increase
Solution Approach 1:
The patent extracts and eliminates the oxidizing agent component from the hair dye system. By using pre-formed cationic polymeric dyes that do not require oxidation to develop color, the harmful oxidative chemicals are removed while maintaining color permanence through the polymeric structure's inherent stability and affinity for keratin fibers.
Solution Approach 2:
The patent changes the chemical state of the dye molecules from oxidizable precursors to pre-formed cationic polymeric structures. This parameter change allows the dye to bind directly to hair without requiring chemical reactions that cause skin irritation, while the polymeric nature ensures long-lasting color.
2Duration of action of stationary object
If oxidative dyes are used for hair coloring, then color depth is improved, but hair damage increases
Solution Approach 1:
The patent removes the oxidative chemicals from the hair coloring process. By using cationic polymeric dyes that can directly bind to hair through electrostatic attraction and covalent bonding, the damaging oxidation step is eliminated while achieving deep, penetrating color through the polymer's ability to interact with keratin structures.
Solution Approach 2:
The patent employs composite polymeric structures combining multiple functional groups (amine, imine, hydroxyl, carboxyl) within a single macromolecular framework. This composite structure enables simultaneous coloration and conditioning functions, providing deep color while the polymeric matrix protects hair integrity.
3Duration of action of stationary object
If oxidative dyes are used for hair coloring, then color permanence is improved, but application complexity increases
Solution Approach 1:
The patent eliminates the need for separate oxidizing agent bottles and mixing steps by incorporating all necessary coloring components into a single cationic polymeric dye formulation. This simplifies application to a single-step process while maintaining permanent color through the polymer's stable structure and strong hair affinity.
Solution Approach 2:
The patent merges the dye precursor, coupler, and oxidizing functions into a single pre-formed cationic polymeric molecule. This consolidation eliminates the need for on-site chemical reactions and simplifies application procedure while achieving permanent color fixation through the polymer's inherent binding capabilities.
4Adaptability or versatility
If oxidative dyes are used for hair coloring, then color range is improved, but processing time increases
Solution Approach 1:
The patent removes the time-consuming oxidation reaction step by using pre-formed cationic polymeric dyes. The color develops immediately upon application through direct binding to hair, eliminating the waiting period required for chemical reactions while maintaining a wide color range through diverse polymeric formulations.
Solution Approach 2:
The patent performs all necessary color development reactions in advance during polymer synthesis, creating pre-formed cationic dyes with fixed color characteristics. This preliminary action eliminates the need for time-consuming in-situ oxidation and allows immediate color deposition on hair application.
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 cationic polymeric dyes provide deep, long-lasting color with improved fastness to washing and reduced application time, minimizing hair damage and skin irritation, while offering a range of shades and ease of use compared to traditional oxidative dyes.
Implementation Method 1
cationic compounds have a good affinity to negative charged hair
Implementation Method 2
These characteristics have been used to contact the hair with small molecules, but also with polymers
Data Source
AI summary
Disclosed are cationic polymeric dye with a hue value of h = 210° to 330° comprising: a) a polymer backbone, b) a residue of an organic dye, and c) optionally colorless organic groups, wherein (b) and (c) are covalently bound to the polymer backbone (a), and wherein the cationic charges can independently be part of the dye or the colorless organic groups. The dyes are distinguished by their depth of shade and their good fastness properties to washing, such as, for example, fastness to light, shampooing and rubbing.