Magnesium Salt Deodorant Sustained pH Control
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Solution Overview
Problem
Formulating aluminum-free, silicone-free deodorants that provide low irritation and maintain effective pH control for odor protection throughout the day is challenging due to issues with fragrance stability and water-soluble ingredients like baking soda, which can cause irritation and instability.
Innovation Solution
A deodorant composition comprising magnesium salts, such as magnesium hydroxide or partially carbonated magnesium hydroxide, in an aqueous or glycol carrier system, which provides antimicrobial activity and sustained pH control, combined with antimicrobials like piroctone olamine and glycols to maintain a hostile environment for bacteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If highly water-soluble alkaline powders like baking soda are used for malodor control, then effective odor protection is achieved, but irritation under the arm increases and fragrance stability deteriorates
Solution Approach 1:
The patent changes the water solubility parameter of the alkaline powder from high (baking soda) to low (magnesium carbonate, calcium carbonate, or aluminum silicate). This parameter change allows the powder to provide sustained pH control and malodor protection without dissolving too quickly, thereby reducing irritation while maintaining fragrance stability.
2Reliability
If highly water-soluble powders are used in aqueous formulations, then effective pH control is achieved initially, but the skin quickly returns to neutral pH and bacteria growth is favored
Solution Approach 1:
The patent changes the water solubility parameter of the active ingredient from high to low. Low water-solubility powders dissolve slowly over time, providing sustained pH control throughout the day. This extended duration of action prevents the skin from quickly returning to neutral pH, thereby maintaining bacterial inhibition and odor protection.
3Reliability
If high-water solubility active ingredients are used, then initial pH control is effective, but fragrance and product instability increase
Solution Approach 1:
The patent changes the water solubility parameter of the active ingredient to low levels. This reduction in solubility decreases the availability of water to react with fragrance oils during hot processing and storage, thereby improving fragrance stability and overall product composition stability while maintaining effective pH control.
4Stability of the object's composition
If particles that are not fully water soluble are used, then fragrance stability improves, but product feel deteriorates due to large particle size
Solution Approach 1:
The patent applies local quality by using low water-solubility powders with controlled, fine particle sizes. This allows different regions of the particle to function differently: the low solubility provides fragrance stability, while the fine particle size ensures smooth product feel and easy application. The particle size is specifically controlled to avoid the grittiness associated with larger particles.
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 magnesium salt-based deodorant composition offers improved antimicrobial activity, reduced irritation, and extended pH control, maintaining a hostile environment under the arm for bacterial inhibition, even after initial application, thus providing long-lasting odor protection.
Implementation Method 1
The key to maintaining adequate malodor control in these systems is having a product that maintains a hostile pH for bacteria
Implementation Method 2
They have benefits of smoother feel at application, less residue, and ease of wash off. Aqueous deodorants, however, can often have a cold feel at application due to the evaporation of water
Implementation Method 3
Aqueous deodorants, however, can often have a cold feel at application due to the evaporation of water
Implementation Method 4
The highly water-soluble alkaline powders contribute to effective malodor control when sweat dissolves the powder
Data Source
AI summary
A deodorant composition comprising a magnesium salt and an aqueous carrier, wherein the deodorant composition is substantially free of aluminum.