Novel Acid Dyes for Polyamide Fastness and Levelness
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Solution Overview
Problem
Current acid dyes lack effective solutions for achieving high fastness and uniform dyeing of fibrous materials, particularly natural and synthetic polyamides, with limitations in light and wet fastness and levelness of color.
Innovation Solution
Development of novel acid dyes with specific chemical structures, including sulpho groups, that can be prepared through conventional diazotization and coupling processes, allowing for efficient dyeing of polyamides and cellulose-based materials, including Inkjet printing, with high exhaustion rates and compatibility with existing dyes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional acid dyes are used for dyeing polyamides, then the dyeing process is simple, but the light and wet fastness are insufficient
Solution Approach 1:
The patent applies composite material principles by combining multiple functional groups within the dye molecule structure. The dye comprises a triphenylmethane core structure integrated with aromatic amine groups, sulphonic acid groups, and various substituents (R1-R8) that provide complementary functions. This molecular-level composite structure enables simultaneous achievement of high light fastness (through the stable triphenylmethane chromophore) and wet fastness (through sulphonic acid groups that enhance bonding to polyamide fibers), while the systematic structural design maintains reasonable synthesis complexity.
2Productivity
If acid dyes with high exhaustion rates are developed, then dyeing efficiency improves, but achieving uniform level dyeings becomes more difficult
Solution Approach 1:
The patent applies local quality principles through the specific substitution patterns on the triphenylmethane core. Different positions (R1-R8) are assigned different functional groups with localized functions: some positions carry sulphonic acid groups for high exhaustion and fiber bonding, while other positions have hydrophobic or electron-donating groups that modulate dyeing kinetics and uniformity. This spatial differentiation of functional groups within the single dye molecule enables simultaneous high productivity (through sulphonic acid-driven exhaustion) and manufacturing precision (through localized control of dyeing rate and uniformity).
Solution Approach 2:
The patent employs parameter changes by systematically varying the substitution patterns, types of substituents, and their positions on the triphenylmethane core. By changing parameters such as the number of sulphonic acid groups, the nature of aromatic amine substituents, and their spatial arrangement, the dyeing kinetics and exhaustion characteristics can be tuned. This allows optimization of both productivity (exhaustion rate) and manufacturing precision (levelness) through precise control of molecular structure parameters rather than requiring separate dye components.
3Reliability
If novel dye structures are introduced to improve fastness properties, then color fastness increases, but compatibility with existing dyes decreases
Solution Approach 1:
The patent applies universality principles by designing the triphenylmethane-based dye structure to perform multiple functions simultaneously. The core structure provides light fastness, sulphonic acid groups provide wet fastness and exhaustion, while the aromatic amine substituents enable compatibility with existing dyeing processes and other dye classes. This multi-functional molecular design allows the novel dye to be universally compatible with conventional acid dyeing processes and can be mixed with existing dyes to create shade combinations, maintaining adaptability while achieving superior fastness properties.
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 excellent light and wet fastness, level dyeings, and compatibility with other dyes, enabling high-quality, consistent color on polyamides and cellulose substrates, suitable for various dyeing processes including Inkjet printing.
Implementation Method 1
compounds of the formula (II), which are known from the literature and in which SG is a protective group such as acetyl for example and the other substituents are each as defined above, are conventionally diazotized and coupled onto one equivalent of a compound of the formula (III)
Implementation Method 2
diazotized and coupled onto one equivalent of a compound of the formula (III)
Implementation Method 3
after the protective group SG has been removed (by hydrolysis) the amine of the formula (IV)
Data Source
AI summary
Compounds of the general formula (I)a process for their preparation and their use for dyeing and/or printing organic substrates are described.