Cationic Azine Dye Deposition on Polyester-Cotton Blends
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Solution Overview
Problem
Current dye technologies fail to effectively deposit on polyester-cotton blended garments without excessively depositing on cotton garments, leading to inadequate whiteness improvement and potential over-blueing.
Innovation Solution
The use of selected cationic azine dyes, which are substantive to both cotton and polyester fabrics, providing effective whiteness improvement with minimal dulling and no build-up, combined with surfactants and optional acid azine dyes in a laundry treatment composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If acid azine dyes are used as shading agents, then they deposit well on cotton garments, but they do not deposit on polyester-cotton blended garments and provide no deposition to polyester garments
Solution Approach 1:
The patent changes the charge parameter of the azine dye from anionic (acid azine dyes) to cationic (basic azine dyes). This parameter change enables the dye to deposit on polyester-cotton blends and pure polyester garments while maintaining cotton garment performance, thereby resolving the contradiction between cotton deposition and polyester-cotton blend adaptability
Solution Approach 2:
The patent uses a composite approach by combining basic azine dyes with other shading agents (such as acid azine dyes or alternative dyes) in a laundry treatment composition. This composite formulation ensures effective deposition on both cotton and polyester-cotton blend garments, achieving universal applicability across different fabric types
2Adaptability or versatility
If cationic azine dyes are used to improve whiteness on polyester-cotton blends, then deposition is achieved, but there is risk of over-blueing on cotton garments
Solution Approach 1:
The patent applies partial action by using basic azine dyes at controlled concentrations and combining them with other shading agents in specific ratios. This partial approach ensures sufficient deposition on polyester-cotton blends while preventing excessive deposition on cotton garments, thereby avoiding over-blueing
Solution Approach 2:
The patent introduces an intermediary substance - a laundry treatment composition that contains basic azine dyes along with other components (such as acid azine dyes or alternative dyes) that act as mediators. This composite formulation moderates the deposition behavior, ensuring adequate performance on polyester-cotton blends while preventing harmful effects on cotton garments
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The cationic azine dyes achieve high deposition on polyester-cotton blends while maintaining minimal deposition on cotton, offering effective whiteness improvement with no build-up, thus addressing the challenge of yellowing and greying.
Implementation Method 1
Acid azine dyes deposit onto cotton but do not build up over multiple washes... Acid azine dyes deposit poorly to polyester-cotton blended garments
Implementation Method 2
a laundry treatment composition comprising: (i) from 2 to 70 wt% of a surfactant
Data Source
AI summary
The present invention provides a laundry treatment composition comprising a cationic azine dye.