Deodorant Composition Stability via Amino Acid Sequestrant
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Solution Overview
Problem
Existing deodorant compositions using lipophilic salicylic acid derivatives with antiperspirant aluminium salts face stability issues and unwanted coloration, particularly when the salicylic acid derivative to antiperspirant salt ratio exceeds 1/20, leading to unsuitable product formulations.
Innovation Solution
Incorporating an amino acid-N,N-diacetic acid salt as a sequestrant in the presence of antiperspirant aluminium salts before emulsification with lipophilic salicylic acid derivatives, ensuring stability and preventing coloration during storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lipophilic salicylic acid derivative is combined with antiperspirant aluminium salt in high ratio, then deodorant efficacy is improved, but coloration and stability issues occur
Solution Approach 1:
The patent introduces a sequestrant as an intermediary substance that binds to the aluminium salt, preventing its direct interaction with the salicylic acid derivative. This mediator approach allows high efficacy ratios while preventing coloration and stability issues through complexation of the aluminium ion.
Solution Approach 2:
The patent modifies the chemical environment by introducing a sequestrant that changes the coordination chemistry of the aluminium salt. This parameter change in the chemical system allows the salicylic acid derivative to function at high concentrations without causing coloration, as the sequestrant alters the aluminium's chemical behavior.
2Reliability
If lipophilic salicylic acid derivative is combined with antiperspirant aluminium salt in high ratio, then deodorant efficacy is improved, but unwanted coloration occurs
Solution Approach 1:
The sequestrant acts as a mediator that prevents the harmful interaction between aluminium salt and salicylic acid derivative that causes coloration. By complexing with aluminium, the sequestrant blocks the pathway for color formation while allowing the deodorant active ingredients to remain effective.
Solution Approach 2:
The patent converts the potentially harmful aluminium ion into a beneficial complexed form through sequestrant binding. The aluminium salt, which could cause coloration at high ratios, is transformed into a stable complex that maintains efficacy while preventing the harmful coloration effect.
3Ease of manufacture
If conventional formulation methods are used without sequestrant, then manufacturing simplicity is maintained, but long-term storage stability deteriorates
Solution Approach 1:
The sequestrant serves as a stabilizing intermediary that prevents degradation pathways during storage. By complexing with aluminium ions, it prevents unwanted chemical reactions that would occur over time, thereby extending storage stability without significantly complicating the formulation process.
Solution Approach 2:
The sequestrant is introduced during formulation to preemptively bind aluminium ions, preventing future coloration and degradation issues. This preliminary complexation action ensures long-term storage stability by addressing potential problems before they can occur during product storage.
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 addition of amino acid-N,N-diacetic acid salts significantly improves the stability and color stability of the deodorant composition, allowing for broader salicylic acid derivative to antiperspirant salt ratios without coloration issues, enhancing long-term efficacy and product suitability.
Implementation Method 1
at least one sequestrant chosen from amino acid-N,N-diacetic acid salts
Implementation Method 2
The principle of action of these active agents is considered to be the formation of a gel in the sweat duct
Implementation Method 3
The invention also relates to a process for preparing a composition in the form of an emulsion, in particular an oil-in-water emulsion
Data Source
AI summary
One subject of the invention is a cosmetic composition comprising, in a cosmetically acceptable medium, at least: (a) a lipophilic salicylic acid derivative or a salt thereof, and (b) at least one antiperspirant aluminium salt or complex, and (c) at least one sequestrant chosen from amino acid-N,N-diacetic acid salts. The invention relates in particular to a composition in the form of an emulsion comprising at least one aqueous phase and at least one fatty phase, in particular an oil-in-water emulsion. The invention also relates to a process for preparing a composition in the form of an emulsion, in particular an oil-in-water emulsion, as defined previously, characterized in that the amino acid-N,N-diacetic acid salt is introduced in the presence of the antiperspirant aluminium salt(s) or complex(es) before mixing with the amino acid-N,N- diacetic acid salt and before emulsification of the aqueous phase and of the fatty phase. The invention also relates to a process for the cosmetic treatment of human perspiration and optionally body odours, using this composition.