Shielding Salt Surface Treatment Composition for Coacervate Control
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Solution Overview
Problem
Conventional surface treatment compositions containing cationic polymers and anionic surfactants often form undesirable coacervates within the product bottle, leading to a thick, difficult-to-pour consistency and variable benefit profiles due to premature coacervate formation, which is mitigated by minimizing cationic polymer levels, thereby compromising surface treatment benefits.
Innovation Solution
Incorporating a shielding salt with a molecular weight of 25 to 500 daltons, incapable of lowering water surface tension below 50 mN/m, in combination with higher levels of cationic polymer and anionic surfactant, to prevent coacervate formation within the bottle while allowing coacervate formation upon dilution, thus maintaining surface treatment benefits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher levels of cationic polymer and anionic surfactant are used to achieve improved surface treatment benefits, then surface treatment effectiveness is improved, but coacervate formation occurs within the product bottle leading to thick, difficult-to-pour consistency
Solution Approach 1:
A shielding salt is introduced as an intermediary substance that mediates between the cationic polymer and anionic surfactant. The shielding salt prevents direct interaction and coacervate formation between these two components during storage, while allowing their beneficial surface treatment effects to manifest. This intermediary approach resolves the contradiction by enabling higher concentrations of active ingredients without the harmful thickening effect.
2Reliability
If higher levels of cationic polymer and anionic surfactant are used to achieve improved surface treatment benefits, then surface treatment effectiveness is improved, but coacervate formation occurs within the product bottle leading to variable benefit profiles
Solution Approach 1:
The shielding salt acts as a stabilizing intermediary that prevents premature coacervate formation, ensuring composition stability during storage. By shielding the electrostatic interactions between cationic polymer and anionic surfactant, the shielding salt maintains a homogeneous composition throughout the product shelf life, while still allowing the ingredients to work together effectively when applied.
3Ease of operation
If cationic polymer levels are minimized to prevent coacervate formation in the product bottle, then pourability is maintained, but surface treatment benefits are compromised
Solution Approach 1:
The shielding salt enables the use of higher cationic polymer levels by mediating their interaction with anionic surfactant. This intermediary approach allows formulators to increase cationic polymer content for improved surface treatment benefits without sacrificing pourability, as the shielding salt prevents the thickening coacervate formation that would otherwise occur.
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 use of shielding salts allows for higher concentrations of cationic polymer and anionic surfactant, preventing coacervate formation in the product bottle and enabling effective coacervate formation upon use, resulting in improved surface treatment benefits without the drawbacks of premature coacervate formation.
Implementation Method 1
inclusion of a shielding salt with higher levels of both cationic polymer and anionic surfactant substantially precludes the formation of coacervates within the bottle
Implementation Method 2
complexing the cationic polymer with the anionic surfactant to form a precipitate complex is known as a 'coacervate'
Data Source
AI summary
A surface treatment composition comprising from about 6% to about 20%, by weight of the composition, of cationic polymer; from about 6% to about 40%, by weight of the composition, of anionic surfactant; and from about 4% to about 15%, by weight of the composition, of a shielding salt, wherein the weight ratio of anionic surfactant to cationic polymer is between about 0.5:1 and about 4:1. The shielding salt is defined by having a molecular weight of from about 25 to about 500 and being incapable of lowering the surface tension of water below 50 mN/m when added to water at concentrations of up to 0.01M.