Acid Azo Dye Composition for Polyamide Fastness and Exhaustion
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Solution Overview
Problem
Existing acid dyes lack improved properties for effective dyeing of organic substrates, particularly in terms of fastness and compatibility with natural and synthetic polyamides.
Innovation Solution
Development of novel acid dyes with specific chemical structures, such as compounds of formula (I), which include anionic substituents and specific alkyl or aryl groups, allowing for improved dyeing properties and compatibility with polyamides, and a process for their preparation involving diazotization and coupling reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional acid dyes are used, then the dyeing process is simple, but the fastness level and exhaustion rate are insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of acid dyes through specific substituents (anionic groups like carboxyl and sulpho, aromatic hydrocarbon radicals with 6-20 carbon atoms) to achieve improved fastness levels and exhaustion rates while maintaining practical dyeing applications
2Adaptability or versatility
If existing acid dyes are used, then the process is conventional and simple, but the compatibility with natural and synthetic polyamides is insufficient
Solution Approach 1:
The patent applies local quality by introducing specific functional groups (anionic substituents) at particular positions on the dye molecule to enhance compatibility with polyamide substrates, while the core structure remains suitable for conventional dyeing processes
3Reliability
If novel acid dyes with specific structures are developed, then fastness and exhaustion rates improve, but the synthesis process becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the dye molecule into distinct functional components (anionic substituents, aromatic hydrocarbon radicals, coupling components) that can be systematically combined through conventional diazotization and coupling reactions to achieve improved performance
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 novel acid dyes provide high fastness levels, excellent exhaustion rates, and consistent hue on polyamide substrates, suitable for various dyeing processes including Inkjet printing, with good light and wet fastness properties.
Implementation Method 1
both the amine functions or the amine function of compounds of the formula (II) which are known from the literature are conventionally diazotized by adding nitrosylsulphuric acid or sodium nitrite
Implementation Method 2
the diazotized or bis-diazotized diamine is allowed to react with the compound (III), preferably in aqueous solution
Data Source
AI summary
Acid dyes, a process for their preparation and their use for dyeing organic substrates of the general formula (I) wherein the substituents have the meaning as indicated in the claims.