Cationic Cross-Linked Polymer Fabric Softener Stability
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Solution Overview
Problem
Traditional polymer architectures in fabric softeners lead to instability issues such as creaming and depletion flocculation, resulting in uneven benefit agent dosage and undesirable appearance, particularly in low pH formulations.
Innovation Solution
The use of a predominantly cationic cross-linked polymer with judiciously selected anionic monomer levels and cross-linking levels to create a stable colloidal glass that facilitates effective benefit agent deposition without aggregation, improving fabric hand, antistatic properties, and freshness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional polymer architectures are used in fabric softeners, then creaming is reduced, but depletion flocculation occurs resulting in water rich layer formation and uneven benefit agent dosage
Solution Approach 1:
The patent applies parameter changes by modifying the polymer's chemical composition parameters - specifically incorporating anionic monomers (acrylic acid, methacrylic acid, or their salts) at controlled levels (0.1-50 mole percent) into the predominantly cationic polymer structure. This compositional parameter change transforms the polymer's interaction with benefit agents, enabling stable suspension without depletion flocculation and ensuring uniform dosage distribution.
2Stability of the object's composition
If polymers are used to decrease creaming, then creaming is reduced, but a water rich layer forms at the bottom of the treatment composition
Solution Approach 1:
The patent employs composite materials by creating a hybrid polymer system that combines cationic polymer backbone with anionic monomer units. This composite structure produces a dual-function material that simultaneously provides cream stability through the cationic framework while preventing water rich layer formation through the anionic components that interact favorably with benefit agents, eliminating the harmful separation effect.
3Stability of the object's composition
If traditional polymer architectures are used, then creaming is controlled, but aggregation of benefit agents occurs
Solution Approach 1:
The patent applies local quality by creating regions of different charge characteristics within the polymer structure. The predominantly cationic framework provides overall cream stability, while localized anionic monomer units (at 0.1-50 mole percent) create specific interaction zones that attract and stabilize benefit agents individually, preventing aggregation while maintaining uniform deposition across the fabric surface.
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 solution provides a stable and efficient deposition of benefit agents, enhancing fabric feel, antistatic properties, and freshness while maintaining stability and uniformity, addressing the limitations of traditional polymer architectures.
Implementation Method 1
the proper selection of such materials yields a stable colloidal glass comprised of cross-linked polymers that generally cannot entangle and that provide a weak anionic interaction that drives benefit agent deposition without causing aggregation
Implementation Method 2
the judicious selection of the anionic monomer level in a predominantly cationic cross-linked polymer and the cross-linking level of such polymer results in a stable treatment composition with improved deposition of benefit agents
Data Source
AI summary
The present invention relates to treatment compositions containing polymer systems that provide stability and benefit agent deposition as well as methods of making and using same. Such treatment compositions may be used for example as through the wash and/or through the rinse fabric enhancers as well as unit dose treatment compositions.