Germicidal Wipe Composition With Stable Anionic-Rich QAC Complexes
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Solution Overview
Problem
Existing compositions of anionic and cationic surfactants, particularly quaternary ammonium compounds (QACs), suffer from incompatibility issues leading to precipitation and reduced germicidal efficacy due to electrostatic interactions, especially when used with cotton-based wipes, necessitating the use of solubilizing co-surfactants or organic solvents that pose environmental and health risks.
Innovation Solution
A method to formulate an anionic-rich catanionic mixture with a specific anionic:cationic ratio and pH, eliminating the need for solubilizing co-surfactants or organic solvents, ensuring clarity and stability, and preventing QAC binding to cotton-based materials by electrostatic complexation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If anionic and cationic surfactants are mixed in conventional formulations, then cleaning and softening properties are improved, but precipitation and reduced stability occur due to electrostatic interactions
Solution Approach 1:
The patent changes the pH parameter to alkaline conditions (pH 8-12) and controls the anionic:cationic ratio (1:1 to 10:1), which transforms the electrostatic interactions from precipitating to soluble catanionic complex formation. This parameter change resolves the contradiction by maintaining formulation stability while preserving cleaning and softening properties.
Solution Approach 2:
The patent creates composite catanionic complexes formed by the interaction of anionic and cationic surfactants under controlled conditions. These composite structures provide both cleaning and softening properties while remaining soluble and stable in alkaline formulations, eliminating precipitation issues.
2Reliability
If QACs are used at high concentrations for germicidal efficacy, then antimicrobial activity is improved, but toxic effects on skin, eyes and airways increase
Solution Approach 1:
The patent introduces anionic surfactants as intermediaries that form catanionic complexes with QACs. These complexes serve as mediators that maintain the germicidal activity of QACs while reducing their direct toxic effects on skin, eyes, and airways through modified interaction mechanisms.
Solution Approach 2:
The patent changes the chemical environment by maintaining alkaline pH conditions, which alters the state of QACs from free cationic form to complexed form. This parameter change preserves germicidal efficacy while reducing toxicity, as the complexes exhibit lower irritancy compared to free QACs.
3Ease of operation
If QACs are applied to cotton-based wipes for disinfection, then germicidal application is improved, but QAC binding to cotton materials occurs reducing available efficacy
Solution Approach 1:
The patent forms composite catanionic complexes that have different binding characteristics compared to free QACs. These complexes reduce electrostatic attraction to cotton fibers while maintaining germicidal activity, thereby reducing QAC loss to the wipe material.
Solution Approach 2:
The anionic surfactant acts as an intermediary that modifies the interaction between QACs and cotton fibers. The catanionic complexes formed have reduced affinity for the negatively charged cotton surface, preventing excessive binding while maintaining the ability to kill microorganisms.
4Stability of the object's composition
If solubilizing co-surfactants or organic solvents are used to prevent precipitation, then formulation stability is improved, but environmental and health risks increase
Solution Approach 1:
The patent extracts and eliminates the need for harmful solubilizing co-surfactants and organic solvents by using a fundamentally different approach - controlling pH and surfactant ratios to form stable catanionic complexes directly in aqueous solution. This removes the harmful substances while maintaining formulation stability.
Solution Approach 2:
The patent changes the pH parameter to alkaline conditions and controls the surfactant ratio, which naturally prevents precipitation without requiring additional solubilizing agents. This parameter change achieves formulation stability inherently, eliminating the need for environmentally harmful co-surfactants and solvents.
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 results in homogeneous, clear, and stable compositions with maintained germicidal efficacy, reducing QAC loss and environmental impact, suitable for various consumer products without the drawbacks of traditional methods.
Implementation Method 1
the oppositely charged surfactant ions react with one another to produce insoluble catanionic compounds
Implementation Method 2
The initial interaction between QACs and bacterial cells wall results from electrostatic interaction between positively charged QACs and negatively charged bacterial cell membranes
Implementation Method 3
followed by the integration of the hydrophobic tail of the QACs into the bacterial hydrophobic membrane core
Implementation Method 4
mixing an anionic surfactant with a water soluble cationic QACs in an aqueous medium under conditions effective to form an anionic-rich catanionic mixture that is clear and free of visible precipitate
Data Source
AI summary
A clear, homogeneous aqueous antimicrobial composition, including: (a) an anionic surfactant; (b) a water-soluble cationic quaternary ammonium (QAC) surfactant; and (c) an aqueous carrier; wherein the composition is clear and free of visible precipitate and retains antimicrobial efficacy, and wherein: (i) a total concentration of the anionic and cationic surfactants is greater than 0.1% by weight; (ii) a weight or molar ratio of the anionic surfactant to the cationic surfactant is greater than 1; and (iii) a pH of the composition is greater than or equal to 7.