Cationic Dye with Polysulfonate Counter Ion for Thermal Stability
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Solution Overview
Problem
Existing color materials, particularly cationic dyes, exhibit insufficient heat resistance, and existing methods to enhance heat resistance, such as salt-forming compounds, do not provide sufficient thermal stability.
Innovation Solution
A color material represented by a specific general formula with a divalent or higher counter cation and anion, forming molecular associations that increase apparent molecular weight and cohesion, thereby enhancing heat resistance, is produced through a condensation reaction between specific organic and anionic compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cationic dyes with chloride or tosilate counter ions are used, then the dyes exhibit good solubility and ease of handling, but they show insufficient heat resistance
Solution Approach 1:
The invention changes the counter ion parameter from conventional chloride/tosilate ions to a specific large organic anion with multiple sulfonate groups. This parameter change fundamentally alters the thermal stability while the multiple sulfonate groups maintain solubility through ionic interactions with the cationic dye molecules.
Solution Approach 2:
The invention creates a composite ion pair structure where the cationic dye molecule associates with a large organic anion containing multiple sulfonate groups. This composite structure combines the solubility benefits of ionic compounds with the thermal stability of extensive molecular associations, resolving the contradiction between ease of handling and heat resistance.
2Reliability
If salt-forming compounds with sulfonated organic compounds are used to improve heat resistance, then some thermal stability is achieved, but sufficient heat resistance is not obtained
Solution Approach 1:
The invention merges multiple sulfonate groups within a single organic anion structure, creating a poly-sulfonated aromatic compound that can form extensive ionic associations with cationic dye molecules. This merging of multiple functional groups into one counter ion enables stronger and more extensive molecular associations compared to using separate sulfonate salts, achieving sufficient heat resistance.
3Reliability
If polysiloxane dyes with high cross-linking are used, then heat resistance is improved, but the dyes form mixtures with unreacted compounds and different polymerization degrees that are difficult to separate
Solution Approach 1:
The invention segments the approach to heat resistance by using a discrete, well-defined organic anion with a specific number of sulfonate groups rather than creating polydisperse polysiloxane chains. This segmentation results in a single counter ion structure that forms consistent ion pairs with the cationic dye, eliminating the mixture of unreacted compounds and different polymerization degrees, and enabling easy separation and high manufacturing precision.
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 resulting color material demonstrates improved heat resistance and stability, with the molecular associations preventing ion dissociation and decomposition, and maintaining color characteristics.
Implementation Method 1
a divalent or higher cation and a divalent or higher anion; forming molecular associations that increase apparent molecular weight and cohesion
Data Source
AI summary
Color materials represented by the following general formula (I):having excellent heat resistance.