Uncharged Azo Dyes for Nylon-Elastane Overblueing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Nylon-elastane fabrics experience overblueing after multiple washes due to the high lightfastness of uncharged blue or violet thiopene dyes used in detergent formulations, leading to undesirable color changes.
Innovation Solution
A laundry treatment composition comprising 2-70 wt% surfactant and 0.00001-0.5 wt% uncharged blue or violet mono-azo dyes with specific heterocyclic structures, applied in an aqueous solution with controlled concentrations, reduces overblueing by selecting dyes of lower lightfastness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uncharged blue or violet thiopene dyes with high lightfastness are used in detergent formulations, then lightfastness on nylon-elastane fabrics is improved, but overblueing of fabrics occurs after multiple washes
Solution Approach 1:
The patent changes the chemical structure parameters of the dye molecules by introducing specific heterocyclic groups (thiophene, pyridine, pyrimidine, triazine) with controlled substitution patterns and heteroatom compositions. This structural parameter modification adjusts the lightfastness property to an optimal level that prevents overblueing while maintaining adequate color stability, directly resolving the contradiction between high lightfastness and overblueing prevention
Data Source
AI summary
The present invention provides a laundry treatment composition comprising an uncharged blue or violet mono-azo dye.