Anhydrous Antiperspirant Ternary Eutectic System
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Solution Overview
Problem
Existing antiperspirant products face challenges such as hydrolysis and polymerization of antiperspirant actives during storage, reducing efficacy, and the aesthetic issue of white residues on skin and clothing due to delivery materials.
Innovation Solution
An anhydrous antiperspirant composition is developed using a eutectic mixture of a basic compound like urea and a zwitterionic stabilizing ligand like trimethylglycine, forming a ternary eutectic system with an aluminum salt, which stabilizes the antiperspirant active and maintains a low melting point, preventing polymerization and residue formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antiperspirant actives are used in traditional formulations, then antiperspirant efficacy is achieved, but the actives undergo hydrolysis and polymerization during storage, reducing efficacy
Solution Approach 1:
The patent changes the chemical environment parameters by using an anhydrous carrier system with controlled pH (3-6) and specific ionic composition (Al³⁺, Ca²⁺, Mg²⁺, Zn²⁺ salts) to prevent hydrolysis and polymerization of the antiperspirant active while maintaining efficacy
Solution Approach 2:
The invention creates a composite formulation combining multiple metal salts (aluminum, calcium, magnesium, zinc) with specific ratios (Al³⁺:Ca²⁺:Mg²⁺:Zn²⁺ = 60:20:10:10 mmol) to stabilize the antiperspirant active and prevent degradation during storage
2Ease of operation
If traditional delivery materials such as sticks or soft solids are used, then antiperspirant actives are delivered to axillary areas, but white residue is left on skin and clothing
Solution Approach 1:
The patent employs an aerosol delivery system that uses pneumatic pressure to spray the antiperspirant composition onto the skin, eliminating the need for solid delivery forms that leave residue while maintaining effective delivery of actives to axillary areas
Solution Approach 2:
The invention changes the physical state of the delivery system from solid (sticks, soft solids) to liquid aerosol formulation, which evaporates completely after application, leaving no white residue on skin or clothing
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 provides enhanced antiperspirant efficacy by stabilizing smaller aluminum species, reducing skin and fabric irritation, and eliminating white residue issues, while maintaining a stable and effective antiperspirant performance over time.
Implementation Method 1
the carrier comprising a eutectic mixture of at least one basic compound selected from a basic amide and a basic amine and at least one member chosen from a cation and zwitterion; and heating the mixture to form a stabilized eutectic system of the at least one antiperspirant active and the anhydrous carrier, and wherein the at least one antiperspirant active, the at least one basic compound and the at least one member chosen from a cation and zwitterion form a ternary eutectic system
Implementation Method 2
heating the mixture to form a stabilized eutectic system of the at least one antiperspirant active and the anhydrous carrier
Implementation Method 3
providing a mixture of at least one antiperspirant active including a metal salt, and an anhydrous carrier for the at least one antiperspirant active in which the at least one antiperspirant active is dissolved
Data Source
AI summary
A method of producing an anhydrous antiperspirant composition comprising (a) providing a mixture of at least one antiperspirant active including a metal salt, and an anhydrous carrier for the at least one antiperspirant active in which the at least one antiperspirant active is dissolved, the carrier comprising a eutectic mixture of at least one basic compound selected from a basic amide and a basic amine and at least one member chosen from a cation and zwitterion; and (b) heating the mixture to form a stabilized eutectic system of the at least one antiperspirant active and the anhydrous carrier, and wherein the at least one antiperspirant active, the at least one basic compound and the at least one member chosen from a cation and zwitterion form a ternary eutectic system.