Cationic Hydrotrope Stabilizes Fabric Care Compositions
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Solution Overview
Problem
Certain cationic surfactants in fabric treatment compositions cause instability and gelling issues, leading to performance degradation, particularly in low pH fabric softeners, which affects the deposition of benefit agents like fabric softeners and freshness actives.
Innovation Solution
The use of a cationic hydrotrope with a specific hydrophilic and hydrophobic balance that does not associate with the softener microstructure in the bottle but complexes with anionic surfactants during washing, preventing interference with deposition and maintaining stability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cationic surfactants are added to fabric treatment compositions, then deposition of benefit agents is improved, but product stability deteriorates and gelling occurs
Solution Approach 1:
The patent changes the chemical parameters of the surfactant system by replacing conventional cationic surfactants with cationic hydrotropes. This parameter change resolves the contradiction because cationic hydrotropes have different molecular structures that prevent the gelation and instability issues while maintaining the ability to enhance deposition of benefit agents through controlled association with anionic surfactants.
Solution Approach 2:
The cationic hydrotrope acts as an intermediary substance that mediates between the anionic surfactants and the benefit agents. It complexes with anionic surfactants in a controlled manner to form soluble complexes that do not cause gelling, while still providing the deposition enhancement function. This intermediary role resolves the contradiction by providing a buffering mechanism that prevents direct harmful interactions.
2Reliability
If cationic surfactants are used to enhance deposition, then fabric hand and softness are improved, but product thickening and gelling occur
Solution Approach 1:
The patent changes the physical-chemical parameters of the formulation by substituting cationic surfactants with cationic hydrotropes. This parameter change resolves the viscosity stability issue because cationic hydrotropes do not form the same gel structures as conventional cationic surfactants, while still providing fabric softness through their interaction with fabric fibers and benefit agents.
Solution Approach 2:
The patent converts the potential harmful effect of cationic-anionic interactions (which cause gelling) into a beneficial controlled complexation. By using cationic hydrotropes that form soluble complexes with anionic surfactants, the harmful gelling effect is transformed into a beneficial deposition enhancement effect that improves fabric softness without compromising product stability.
3Reliability
If hydrophobic cationic surfactants are used, then deposition efficiency is improved, but hydrophobicity causes instability and association in the bottle
Solution Approach 1:
The patent changes the hydrophobicity parameter of the cationic component by using cationic hydrotropes with optimized hydrophilic-lipophilic balance. This parameter change resolves the contradiction because the cationic hydrotropes have sufficient hydrophilicity to remain soluble and stable in the aqueous formulation while maintaining enough hydrophobicity to associate with anionic surfactants and benefit agents for enhanced deposition.
Solution Approach 2:
The cationic hydrotrope serves as a hydrophilic intermediary that bridges the hydrophobic benefit agents and the aqueous environment. It provides the necessary hydrophobic interaction for deposition enhancement while its hydrophilic character prevents premature association and instability in the aqueous bottle storage environment, thus resolving the hydrophobicity-stability 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
This approach provides stable fabric treatment compositions with improved fabric hand, antistatic properties, and freshness by ensuring effective deposition of softener actives while preventing gelling issues.
Implementation Method 1
the proper selection of a cationic hydrotrope that is hydrophilic enough to not associate with the softener microstructure in the bottle but still hydrophobic enough to complex and precipitate with anionic surfactant carried over from the wash
Data Source
AI summary
The present invention relates to treatment compositions containing polymer systems that provide stability and benefit agent deposition and a cationic hydrotrope 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.