Trisazo Dye Storage Stability Inkjet Printing
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Solution Overview
Problem
Existing black dyes for inkjet printing lack sufficient storage stability, leading to changes in color strength and location when liquid dye solutions are stored.
Innovation Solution
Development of trisazo compounds with specific structural formulas, such as (I), which can be present as free acids or salts, particularly as alkali metal or ammonium salts, offering improved storage stability in aqueous solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing black dyes (CI Acid Black 1, CI Direct Black 19, or known trisazo dyes from EP-A 3 020 770) are used for inkjet printing, then the printing function is achieved, but the storage stability deteriorates with changes in color strength and color locus during storage
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of trisazo dyes through specific substitutions at positions R1, R2, R3, R4, R5, and R6 with electron-donating or electron-withdrawing groups. These structural parameter changes result in dyes that maintain exceptional storage stability with color strength and color locus remaining constant during storage, directly resolving the contradiction between achieving printing function and maintaining composition stability.
2Adaptability or versatility
If conventional black dyes are used in liquid dye solutions for inkjet printing, then the dyeing and printing applications are enabled, but the color strength and color location change during storage period
Solution Approach 1:
The patent modifies molecular parameters by introducing specific substituent groups at defined positions of the trisazo core structure, creating dyes that maintain their color properties (color strength and color location) unchanged during storage while remaining fully adaptable for various dyeing and printing applications including inkjet printing on diverse substrates.
Solution Approach 2:
The patent creates composite dye molecules by combining the trisazo core structure with specific aromatic amine and diazocomponent derivatives having particular substituent patterns. This composite structure approach enables the dye to simultaneously achieve broad application versatility and exceptional storage stability with unchanged color properties.
Data Source
AI summary
Trisazo compounds of formula (I), with the proviso that R1 represents SO3 M if R2 represents hydrogen. These trisazo compounds are extremely well suited to dyeing and printing natural and synthetic materials, and in particular to using as recording liquid media for ink-jet printing.