Topical Anhydrous Aerosol Foam Stabilization
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Solution Overview
Problem
Existing topical pharmaceutical compositions, particularly lipophilic ones, are often perceived as too waxy or greasy, and aerosol systems that avoid greasiness typically use defoaming agents, which are undesirable in foaming delivery systems.
Innovation Solution
A topical aerosol foam composition combining a lipophilic compound, liquid silicone, foaming agent, propellant, and rheology modifiers creates a pharmaceutically elegant foam that stabilizes and maintains quality, even with high liquid silicone content, which would otherwise act as defoamers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If liquid silicones are used to provide non-greasy skin feel, then skin feel and cosmet elegance are improved, but foam stability deteriorates because liquid silicones act as defoaming agents
Solution Approach 1:
The patent introduces foam stabilizers (surfactants or polymers) as intermediary substances that mediate between the defoaming liquid silicones and the foam structure. These stabilizers form a protective network that prevents liquid silicones from collapsing the foam, allowing both non-greasy skin feel and foam stability to coexist
Solution Approach 2:
The patent changes the concentration parameters by using small amounts of liquid silicones (1-20% w/w) combined with specific concentrations of foam stabilizers. This parameter optimization allows the system to achieve non-greasy feel without excessive defoaming, while maintaining foam stability through the stabilizing agents
2Reliability
If lipophilic compounds are used as carriers, then drug delivery capability is improved, but skin feel deteriorates because the composition feels too waxy or greasy
Solution Approach 1:
The patent creates a composite carrier system combining lipophilic compounds (for drug delivery) with liquid silicones (for non-greasy feel) and foam stabilizers (for foam maintenance). This composite formulation integrates the benefits of different material classes while mitigating their individual drawbacks
Solution Approach 2:
The patent merges traditionally incompatible components - lipophilic carriers, liquid silicones, and foam stabilizers - into a unified aerosol foam system where they work synergistically to provide both effective drug delivery and pleasant skin feel
3Ease of manufacture
If conventional aerosol systems are used to avoid greasiness, then skin feel is improved, but foam quality deteriorates due to the presence of defoaming agents
Solution Approach 1:
The patent introduces foam stabilizers as intermediary substances that mediate between the defoaming liquid silicones and the foam structure. These stabilizers form a protective network that prevents liquid silicones from collapsing the foam, allowing both non-greasy skin feel and foam stability to coexist
Solution Approach 2:
The patent changes the concentration parameters by using small amounts of liquid silicones (1-20% w/w) combined with specific concentrations of foam stabilizers. This parameter optimization allows the system to achieve non-greasy feel without excessive defoaming, while maintaining foam stability through the stabilizing agents
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 composition provides effective, cosmetically superior drug delivery with improved skin feel, larger surface coverage, reduced adverse reactions, and preservation of light-sensitive actives through a sealed, anhydrous system.
Implementation Method 1
A topical pharmaceutical aerosol foam composition containing a lipophilic compound, a liquid silicone, a foaming agent, a propellant and a topical pharmaceutical active
Data Source
AI summary
A topical pharmaceutical aerosol foam containing liquid silicones to enhance cosmetic elegance. Although liquid silicones are inherent defoamers, a high quality, stable foam is produced.