Disperse Dye Mixtures for Uniform Polyester Dye Buildup
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Solution Overview
Problem
Existing disperse dyes for hydrophobic textile materials, such as polyester and polyester-elastane, face challenges in achieving uniform dye buildup and fastness, particularly in wash and contact resistance.
Innovation Solution
A mixture of benzodifuranone and disperse azo dyes, specifically formulated with defined structural components, is used to enhance dye deposition and fastness on hydrophobic materials, comprising dyes of formulas (I) and (II) with specific substituents and mixing ratios, optimized for mechanical dispersion to achieve fine particle sizes and improved dyeing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing disperse dyes are used for dyeing hydrophobic textile materials, then dyeing can be performed, but uniform dye buildup and fastness are not achieved
Solution Approach 1:
The patent applies composite materials by combining benzodifuranone dyes and disperse azo dyes into a synergistic mixture. The benzodifuranone component (formula I) provides excellent fastness properties, while the disperse azo dye component (formula II) contributes to color strength and uniformity. This composite dye system resolves the contradiction by achieving both uniform dye buildup and high fastness that neither dye type could achieve alone.
2Ease of manufacture
If single disperse dyes are used, then dyeing process is simple, but wash and contact resistance are insufficient
Solution Approach 1:
The patent merges two distinct dye types - benzodifuranone dyes and disperse azo dyes - into a single dyeing formulation. This combination allows the dyeing process to maintain simplicity (single bath application) while achieving superior wash and contact resistance through the synergistic interaction between the two dye components. The benzodifuranone dye provides exceptional wash fastness, while the disperse azo dye enhances color properties.
3Reliability
If dye mixtures are formulated with specific components and ratios, then color buildup and fastness are improved, but formulation complexity increases
Solution Approach 1:
The patent applies parameter changes by optimizing specific molecular structure parameters of the benzodifuranone dye (formula I) and disperse azo dye (formula II), including substituent types and positions. By carefully selecting and adjusting these molecular parameters, the invention achieves enhanced fastness and color buildup properties. The defined structural parameters and their specific ranges allow for systematic optimization without excessive formulation complexity.
Data Source
AI summary
The present invention provides dye mixtures containing at least one dye of formula (I) and at least one dye of formula (II) where T1, T2, R1 to R9 and n are each as defined in claim 1, processes for their preparation and their use.