Aluminum-Free Deodorant Stick with Magnesium Buffering
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Solution Overview
Problem
There is a challenge in formulating non-aluminum, natural fragrance deodorants that provide low irritation while maintaining effective odor protection, as natural and essential oil fragrances are less stable in heat and extreme pH, and high water solubility powders can lead to irritation and product instability.
Innovation Solution
The combination of piroctone olamine with other antimicrobials and chelators in specific ratios and particle sizes, along with a liquid triglyceride and structurants, creates a deodorant stick that offers superior antimicrobial activity and stability, free from aluminum salts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If natural and essential oil fragrances are used, then product naturalness and consumer appeal are improved, but stability in heat and extreme pH deteriorates
Solution Approach 1:
The patent introduces magnesium hydroxide and magnesium carbonate as intermediary substances that buffer the pH and protect natural fragrances from degradation. These magnesium compounds act as mediators between the acidic sweat environment and the pH-sensitive natural oils, maintaining fragrance stability without compromising the naturalness of the formulation.
Solution Approach 2:
The invention creates a composite deodorant system combining magnesium hydroxide, magnesium carbonate, and natural fragrances. This composite formulation leverages the buffering capacity of the magnesium compounds to protect the volatile aromatic components from pH-induced degradation, achieving both naturalness and stability simultaneously.
2Reliability
If high water solubility powders are used, then antimicrobial efficacy is improved, but irritation and product stability deteriorate
Solution Approach 1:
The patent changes the solubility parameter of the antimicrobial active by using magnesium hydroxide and magnesium carbonate, which have low water solubility. This parameter change reduces irritation while maintaining antimicrobial efficacy through direct contact with bacteria rather than dissolution in sweat. The low solubility also prevents the gritty texture and instability associated with high water solubility powders.
3Reliability
If aluminum salts are used, then antiperspirant effectiveness is improved, but consumer acceptance deteriorates due to aluminum-free preferences
Solution Approach 1:
The invention extracts and removes aluminum salts from the formulation entirely, replacing them with magnesium hydroxide and magnesium carbonate. This extraction eliminates the consumer concern about aluminum while maintaining the core antiperspirant function through the magnesium-based active ingredients, thereby improving consumer acceptance without sacrificing effectiveness.
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 results in a deodorant with significant antimicrobial performance, improved stability, and reduced irritation, providing odor protection comparable to commercial deodorants while using natural ingredients.
Implementation Method 1
The inventors of the present invention have found that select combinations of chelators and piroctone olamine, such as in an anhydrous formulation or in particular ratios, can provide significantly higher levels of anti-fungal activity than either material alone.
Implementation Method 2
a primary structurant with a melting point of at least 50° C.
Data Source
AI summary
A deodorant stick comprising at least 25% by weight liquid triglyceride; a primary antimicrobial having a water solubility of at most about 90 g/L at 25° C.; a fragrance composition comprising at least about 50% natural oils, essential oils, or a combination thereof; and a primary structurant with a melting point of at least 50° C.; said deodorant stick being free of an aluminum salt; and said deodorant stick having a hardness from about 70 mm*10 to about 140 mm*10, as measured by penetration with ASTM D-1321 needle.