Sulfide Dye Mixture for Keratin Fiber Fastness
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Solution Overview
Problem
Existing dyes for organic materials, particularly keratin-containing fibers, suffer from unsatisfactory fastness to washing, light, shampooing, and rubbing, with cationic dyes exhibiting brilliant shades but poor durability.
Innovation Solution
A mixture of sulfide dyes comprising specific compounds of formulas (1) and (2), which include cationic and thio ester groups, providing deep shades with improved fastness properties when combined in specific ratios and used in dye compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If cationic dyes are used for dyeing organic materials, then brilliant shades are achieved, but fastness to washing deteriorates
Solution Approach 1:
The patent combines cationic dyes (providing brilliant shades) with sulfur dyes (providing good fastness) into a mixed dye composition. This merging allows the final dyeing to simultaneously achieve the brilliant coloration of cationic dyes and the washing fastness of sulfur dyes, resolving the contradiction between shade brilliance and fastness to washing.
2Device complexity
If single dye compounds are used, then formulation simplicity is maintained, but dyeing performance and fastness properties deteriorate
Solution Approach 1:
The patent creates a composite dye system by formulating mixtures of different dye compounds (cationic dyes, sulfur dyes, and their combinations) with specific structural characteristics. These composite dye formulations achieve superior fastness properties and dyeing performance while maintaining practical formulation simplicity through defined compositional ranges and preparation methods.
3Quantity of substance
If deep color intensity is increased, then staining power improves, but fastness to light and rubbing deteriorates
Solution Approach 1:
The patent optimizes the compositional parameters of the dye mixture, specifically controlling the ratio of cationic dyes to sulfur dyes, and adjusting concentrations within defined ranges. By changing these parameters, the formulation achieves deep color intensity while maintaining fastness to light and rubbing, as the balanced composition prevents the excessive staining power that would otherwise compromise fastness.
Data Source
AI summary
Disclosed are mixtures of sulfide dyes and dyeing compositions comprising mixtures of sulfide dyes. The dye mixtures are useful for the dyeing of organic materials, such as keratin fibers, preferably human hair.