Cationic Ammonium Stabilization with Chelators
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Solution Overview
Problem
Quaternary ammonium compounds used in skin moisturization are unstable in aqueous environments, leading to dealkylation and the release of nitrogen-containing groups, which can reduce moisturizing efficacy and require additional fragrances and cold storage to prolong product longevity.
Innovation Solution
Stabilizing cationic ammonium compounds with pyridine-based or heteroketo-based chelators, such as Chelidamic acid, to prevent the generation of nitrogen-containing groups in aqueous environments, enhancing their stability and performance in topical and other applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quaternary ammonium compounds are used in aqueous environments for skin moisturization, then moisturizing efficacy is improved, but the compounds become unstable and undergo dealkylation
Solution Approach 1:
A chelating agent is introduced as an intermediary substance that binds to metal ions in the aqueous environment, preventing them from catalyzing the dealkylation of quaternary ammonium compounds. This mediator protects the compound stability while allowing the moisturizing function to persist.
Solution Approach 2:
The patent modifies the chemical environment parameters by adjusting pH, adding chelating agents, or changing ionic strength to stabilize the quaternary ammonium compound against dealkylation while maintaining its moisturizing efficacy in aqueous formulations.
2Reliability
If quaternary ammonium compounds are used in aqueous formulations, then skin moisturization is enhanced, but nitrogen-containing groups are generated causing unpleasant odor
Solution Approach 1:
The patent converts the potentially harmful dealkylation reaction into a beneficial stabilization process by using chelating agents that prevent the reaction from occurring. This eliminates the harmful nitrogen-containing groups and their associated odors while preserving the moisturizing function.
Solution Approach 2:
A chelating agent serves as a protective intermediary that blocks the chemical pathway leading to harmful nitrogen-containing group generation, thereby preventing odor problems while maintaining product efficacy.
3Reliability
If quaternary ammonium compounds are used in aqueous environments, then moisturizing benefits are achieved, but product longevity is reduced requiring cold storage
Solution Approach 1:
The patent changes storage and formulation parameters by using chelating agents that stabilize the compound at ambient temperatures, eliminating the need for cold storage while extending product longevity and maintaining moisturizing benefits.
Solution Approach 2:
A chelating agent is introduced as a protective intermediary that prevents degradation pathways, thereby extending product shelf life and longevity without requiring special cold storage conditions.
4Device complexity
If quaternary ammonium compounds undergo dealkylation, then product stability is compromised, but additional fragrances are required to mask unpleasant odors
Solution Approach 1:
The patent converts the problem of odor generation into a benefit by preventing dealkylation through chelating agents, thereby eliminating the need for additional fragrance masking agents and simplifying the formulation.
Solution Approach 2:
The patent extracts and eliminates the root cause of odor problems (dealkylation) through chelating agents, removing the need for additional fragrance components and simplifying the overall formulation.
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 stabilization of cationic ammonium compounds with chelators significantly reduces the generation of unwanted nitrogen-containing groups, improving their moisturizing efficacy and allowing for longer product shelf life without the need for cold storage, while also providing more fragrance options.
Implementation Method 1
The cationic ammonium compounds are stabilized with a pyridine-based chelator, heteroketo-based chelator or both, and unexpectedly, the generation of a nitrogen comprising group in, for example, an aqueous environment is impeded.
Data Source
AI summary
Stabilized cationic ammonium compounds are described. The compounds are stabilized with pyridine-based chelators and/or heteroketo-based chelators that impede the generation of nitrogen comprising groups from the cationic ammonium compounds.