Metal-Free Reactive Dye Composition for Dark Shade Fastness
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Solution Overview
Problem
Metal-free reactive dyes used for dyeing and printing on hydroxyl-, amino-, and/or carboxamido-containing materials face limitations in achieving dark shades with good light and wash fastness, particularly for colors like dark violet, dark brown, and navy.
Innovation Solution
Development of dyes with a specific formula (I) that include a diazo, middle, and coupling component with reactive anchors, offering high build-up capabilities and excellent fastness properties while being metal-free, thus providing superior ecological performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If metal-free reactive dyes are used, then ecological performance is improved, but light fastness and wash fastness deteriorate
Solution Approach 1:
The patent employs composite molecular structures combining diazo components, middle components, and coupling components with reactive anchors. This multi-component composite approach creates dyes that maintain metal-free ecological benefits while achieving superior light and wash fastness through synergistic structural interactions.
Solution Approach 2:
The invention modifies molecular parameters by introducing specific reactive anchor groups and optimizing the chromophore structure. These parameter changes enable the metal-free dyes to achieve dark shades with enhanced fastness properties, resolving the contradiction between ecological performance and durability.
2Object-affected harmful factors
If metal-free reactive dyes are used, then ecological performance is improved, but ability to achieve dark shades deteriorates
Solution Approach 1:
The composite structure comprising diazo, middle, and coupling components creates extended chromophore systems that absorb light more effectively. This composite approach enables deep, intense dark shades while maintaining the ecological advantages of being metal-free.
Solution Approach 2:
The patent extends the chromophore system through multiple coupled aromatic rings and conjugated structures, adding dimensional complexity to the molecular architecture. This dimensional expansion increases light absorption capacity, enabling deep dark shades without requiring metal complexes.
3Quantity of substance
If conventional reactive dyes are used, then dark shades can be achieved, but levelness of dyeing deteriorates
Solution Approach 1:
The invention optimizes the solubility parameters and molecular size of the reactive dyes by introducing specific hydrophilic groups and controlling the overall molecular architecture. These parameter adjustments ensure uniform diffusion and penetration into fibers, achieving excellent levelness even at high color depths.
Data Source
AI summary
The present invention relates to reactive dyes of the formula (I) in which A, B, a and K are defined as given in claim, a process for preparing them, and their use for dyeing and printing hydroxyl-, amino-, and/or carboxamido-containing materials.