Liquid Detergent Dye Polymer Composition to Reduce Fabric Staining
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Solution Overview
Problem
In liquid laundry detergent compositions, the application of dye polymers can result in unwanted blue stains on fabrics due to the presence of small molecules with the same chromophore as the dye polymer, which are not covalently bound to the polymer.
Innovation Solution
A liquid laundry detergent composition is formulated with a dye polymer obtained by reacting a blue or violet dye containing an NH2 group with a polymer, forming a covalent bond, and including a weight ratio of dye polymer to unbound dye, where the unbound dye has 0 to 2 repeating units, to minimize unwanted staining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dye polymer is applied to fabric in liquid detergent formulation, then fabric whitening is achieved, but unwanted blue stains appear on fabric
Solution Approach 1:
The patent removes the harmful unbound dye molecules from the formulation by严格控制 their content to 0-2 repeating units, while retaining the beneficial dye polymer with 3 or more repeating units. This extraction principle eliminates the staining problem while preserving the whitening function.
Solution Approach 2:
The patent changes the critical parameter of repeating units from 0-2 (harmful unbound dye) to 3 or more (beneficial dye polymer). By controlling this structural parameter, the formulation achieves fabric whitening without unwanted blue stains.
2Reliability
If unbound dye with same chromophore as dye polymer is present in formulation, then dye polymer function is maintained, but staining problem occurs
Solution Approach 1:
The patent extracts and eliminates unbound dye molecules with 0-2 repeating units from the formulation, keeping only the beneficial dye polymer with 3 or more repeating units. This removes the staining source while maintaining the whitening function.
Solution Approach 2:
The patent applies different quality standards to different molecular forms: unbound dye (0-2 repeating units) is strictly limited to prevent staining, while dye polymer (3+ repeating units) is encouraged for whitening. This local quality differentiation resolves the contradiction.
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 approach significantly reduces unwanted staining on fabrics by controlling the level of unbound dye molecules, ensuring that the dye polymer is effectively bound, thereby maintaining the desired hue and preventing blue stains.
Implementation Method 1
a dye polymer, wherein the dye polymer is obtainable by reacting a blue or violet dye containing an NH2 group with a polymer to form a covalent bond
Data Source
AI summary
The present invention relates to dye polymers and use in liquid laundry detergent compositions.