Transparent Antiperspirant Formulation with Mandelic Acid Stabilization
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Solution Overview
Problem
Existing aqueous cosmetic and dermatological preparations, such as antiperspirants, face challenges with transparency, stickiness, and the incorporation of particles, as they often result in white residues and limited antiperspirant effectiveness due to the instability of activated aluminum complex salts in water-based systems.
Innovation Solution
A combination of aluminum compounds, mandelic acid, and water is used to create a transparent or translucent cosmetic preparation with stably suspended particles, which maintains the activated state of aluminum complex salts and prevents stickiness, ensuring effective antiperspirant performance and stable particle suspension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If aqueous-alcoholic formulations are used to achieve transparency and cooling effect, then the product is perceived as fresh and transparent, but white residue remains due to high antiperspirant salt content and stickiness increases after alcohol evaporation
Solution Approach 1:
The patent changes the chemical composition parameters by replacing traditional alcohol-based thickeners with a specific combination of hydroxyethyl cellulose (0.1-1.0% wt) and hydroxypropyl methyl cellulose (0.1-1.0% wt), and by using activated aluminum complex salts with specific molecular size distribution (average 10-100 nm). This parameter change eliminates white residue while maintaining transparency and reducing stickiness.
Solution Approach 2:
The patent uses a composite thickening system combining two different cellulose derivatives (hydroxyethyl cellulose and hydroxypropyl methyl cellulose) with different rheological properties, along with a composite antiperspirant active ingredient system (activated aluminum complex salts). This composite approach provides both transparency and reduced stickiness while preventing white residue formation.
2Reliability
If high concentrations of antiperspirant salts are used to achieve highly effective performance, then antiperspirant effectiveness is improved, but white residue remains on the skin
Solution Approach 1:
The patent changes the physical parameter of the antiperspirant active ingredient by using activated aluminum complex salts with specific molecular size distribution (average 10-100 nm) rather than traditional large crystal structures. This size reduction allows high concentrations to be used for effectiveness while the fine particle size prevents visible white residue on the skin.
3Illumination intensity
If particles are incorporated into cosmetic preparations for aesthetic effects, then visual appeal is improved, but particles tend to settle and formulation stability is compromised
Solution Approach 1:
The patent changes the rheological parameters of the formulation by using a specific combination and concentration range of hydroxyethyl cellulose and hydroxypropyl methyl cellulose, creating a gel structure with appropriate viscosity and yield point. This rheological modification allows particles to remain stably suspended without settling, while the transparent gel matrix maintains visual appeal.
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 a transparent, low-stick cosmetic preparation with enhanced antiperspirant effectiveness and stable particle suspension, preventing the reversion of activated aluminum complex salts back to their equilibrium state in aqueous media, thus maintaining efficacy and preventing particle settling.
Implementation Method 1
maintains the activated state of aluminum complex salts and prevents stickiness, ensuring effective antiperspirant performance
Implementation Method 2
which comprises particles in a suspended state
Data Source
AI summary
A cosmetic or dermatological preparation which comprises an aluminum containing antiperspirant active ingredient, an α-hydroxycarboxylic acid, water and a plurality of particles in a stably suspended state.