Disperse dye mixtures, their preparation and use
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Solution Overview
Problem
Existing disperse azo dyes fail to provide superior wash, contact, and sublimation fastness on hydrophobic textile materials like polyester and polyester-elastane, limiting their performance in dyeing and printing applications.
Innovation Solution
A mixture of specific disperse azo dyes with defined chemical structures, including those of formulas (I), (II), and (III), which are combined in specific ratios to enhance fastness properties, is used for dyeing hydrophobic materials, particularly polyester and polyester-elastane fabrics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single disperse azo dyes are used for dyeing hydrophobic textile materials, then the dyeing process is simple, but the wash, contact, and sublimation fastness are insufficient
Solution Approach 1:
The patent combines multiple disperse azo dyes with different chemical structures (formulae I, II, and III) into a single dye mixture. This merging of different dye components works synergistically to provide outstanding wash and contact fastness while maintaining good sublimation fastness, which cannot be achieved by single dyes alone.
Solution Approach 2:
The invention creates a composite dye system comprising dyes of formulae I, II, and III in specific weight ratios (1:0.5-2:0.5-2). This composite approach allows each dye component to contribute its strengths, resulting in a dye mixture with superior overall fastness properties compared to individual dyes.
2Duration of action of stationary object
If dye mixtures are used to improve fastness properties, then the service life of dyeings is extended, but the formulation complexity increases
Solution Approach 1:
The patent optimizes the weight ratios of the dye components (formulae I, II, and III) within specific ranges (1:0.5-2:0.5-2). By carefully adjusting these parameters, the invention achieves the best balance between fastness improvement and formulation simplicity, ensuring outstanding wash and contact fastness with good sublimation fastness.
3Manufacturing precision
If specific dye ratios are used to achieve level shades, then the uniformity of dyeing is improved, but the precision of formulation control is required
Solution Approach 1:
The patent assigns specific functional roles to each dye component in the mixture. Dyes of formula I, II, and III are selected to complement each other's properties, with each contributing specific characteristics that collectively achieve level shades and uniform dyeing distribution across the textile material.
Data Source
AI summary
The present invention relates to dye mixtures containing at least one dye of formula (I) and at least either a dye of formula (II) and/or at least one dye of formula (III) where R1-R15, n, o, X and D1-D3 are each as defined in claim 1. These dye mixtures are useful for dyeing or printing hydrophobic materials in particular.