Acid Dye Composition for Level Polyamide Dyeing in Aqueous Media
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Solution Overview
Problem
Current acid dyes are not effectively used for dyeing polyamide fibers in aqueous media, particularly for achieving high fastness and level dyeings on natural and synthetic polyamides like wool and nylon.
Innovation Solution
Development of specific acid dyes with the general formula (I), containing anionic substituents such as sulpho groups, which are used in combination with conventional processes to produce compounds suitable for dyeing polyamide fibers, offering high fastness and level dyeings in aqueous media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional acid dyes are used for dyeing polyamide fibers, then dyeing can be performed, but high fastness and level dyeings cannot be achieved in aqueous media
Solution Approach 1:
The patent modifies the chemical structure of acid dyes by introducing specific anionic substituents (sulpho groups) at defined positions in the molecular structure. This parameter change in molecular composition enables the dye to function effectively in aqueous media while maintaining high fastness properties on polyamide fibers, resolving the contradiction between fastness and media adaptability.
2Reliability
If specific structural modifications are made to achieve high fastness, then fastness improves, but dyeing process simplicity may deteriorate
Solution Approach 1:
The patent applies local quality by introducing sulpho groups at specific local positions (R1 and/or R2) in the dye molecule rather than uniformly modifying the entire structure. This localized modification achieves the desired fastness improvement while minimizing overall structural complexity and maintaining compatibility with conventional dyeing processes.
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 dyes provide excellent light and wet fastness, level dyeings, and are compatible with existing acid dyes, suitable for various dyeing processes including Inkjet printing, achieving consistent hues and high exhaustion rates on polyamide fibers.
Implementation Method 1
The dyes of the formula (I) and their salts are particularly suitable for dyeing or printing fibrous material consisting of natural or synthetic polyamides
Implementation Method 2
both the amine functions of compounds of the formula (II) which are known from the literature are conventionally diazotized and coupled onto totally two equivalents of a compound of the formula (III)
Implementation Method 3
both the amine functions of compounds of the formula (II) which are known from the literature are conventionally diazotized and coupled onto totally two equivalents of a compound of the formula (III)
Data Source
AI summary
Use acid dyes for dyeing organic substrates of the general formula (I) wherein the substituents have the meaning as indicated in the claims.