Polyester Comb Polymers in Detergents for Dye Transfer Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing detergents fail to effectively prevent dye transfer from dyed textiles to undyed or differently colored textiles during washing, leading to undesirable color changes and discoloration.
Innovation Solution
The use of polyester-based comb polymers, obtained through aza-Michael addition of S-substituted primary aminothiols to oligoesters of unsaturated dicarboxylic acids and diols, which act as dye transfer inhibitors in aqueous washing solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymers with high affinity for dyes are used to prevent dye transfer, then dye transfer inhibition is improved, but color loss from dyed fibers increases
Solution Approach 1:
The invention changes the chemical parameters of the polymer by controlling the molar ratio of carboxyl groups to hydroxyl groups (specifically 1:1 ratio), and by precise control of molecular weight (1000-10000 Da), to achieve optimal dye transfer inhibition while minimizing color loss. This parameter optimization resolves the contradiction between effective dye transfer prevention and maintaining dye stability on fibers.
Solution Approach 2:
The invention uses a composite polymer structure formed by the reaction of polyol and polycarboxylic acid components, creating a specific molecular architecture with both carboxyl and hydroxyl functional groups in balanced proportions. This composite structure provides the right balance of dye interaction capabilities - sufficient to prevent transfer but controlled enough to avoid excessive color extraction.
2Reliability
If conventional polymers are used as dye transfer inhibitors, then dye transfer is reduced, but the complexity of the detergent formulation increases
Solution Approach 1:
The invention segments the polymer into two distinct components: a polyol component and a polycarboxylic acid component, which are mixed in specific proportions (1:1 molar ratio). This segmentation allows for simpler individual components that are easy to manufacture and stabilize, while achieving the desired complex functionality when combined, thus reducing overall formulation complexity.
Solution Approach 2:
The polymer composition serves multiple functions simultaneously: it acts as a dye transfer inhibitor, a fabric softener, and a detergent additive. The presence of both carboxyl and hydroxyl groups provides universal functionality for interacting with different types of dyes and fabric surfaces, reducing the need for multiple specialized additives and simplifying the overall detergent formulation.
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
These polymers significantly reduce dye transfer, preventing both fading and discoloration, particularly when washing white textiles, and are effective in detergents at concentrations of 0.01 wt.% to 5 wt.%, enhancing color constancy.
Implementation Method 1
Many of the polymers commonly used have such a high affinity for dyes that they attract them more strongly from the dyed fibers
Implementation Method 2
aza-Michael addition products of S-substituted primary aminothiols to oligoesters of unsaturated dicarboxylic acids and diols
Data Source
AI summary
The aim of the invention is to improve the color protection properties of detergents when used to wash colored textiles. This aim is essentially achieved by using polyester-based comb polymers that are obtained by aza-Michael addition of primary monoamines or primary or secondary diamines on diesters from unsaturated monocarboxylic acids and diols.