Silicone Particle Encapsulation for Controlled Release
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Solution Overview
Problem
Existing formulations for active ingredients like retinol in topical applications face challenges such as rapid degradation and skin irritation due to poor control over dosage and delivery, making it difficult to achieve stable and controlled release.
Innovation Solution
The method involves creating silicone particles with a narrow size distribution and tunable crosslink density for encapsulating active ingredients, using silane monomers in an acidic aqueous solution with a catalyst, and adding a co-solvent to facilitate controlled release, allowing for precise control over particle size, compressibility, and release performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If core-shell encapsulation approach is used, then encapsulation of active ingredient is achieved, but release occurs in bolus form rather than controlled release
Solution Approach 1:
The patent changes the physical-chemical parameters of the encapsulation system by using a matrix encapsulation approach with specific polymer compositions and crosslinking densities, transforming the release mechanism from bolus to controlled sustained release over time
Solution Approach 2:
The patent employs composite materials consisting of multiple polymer components with different properties (e.g., hydrophilic and hydrophobic polymers) to create a matrix structure that provides both encapsulation stability and controlled release characteristics
2Manufacturing precision
If highly complex multi-stage encapsulation processes are used, then encapsulation precision is improved, but scalability and economic viability deteriorate
Solution Approach 1:
The patent merges multiple encapsulation steps into a single one-stage process where polymers are combined and crosslinked simultaneously in the presence of the active ingredient, achieving precise encapsulation without requiring complex multi-stage procedures
Solution Approach 2:
The patent performs preliminary mixing of polymer components and active ingredient before the crosslinking reaction, ensuring uniform distribution and preventing aggregation, which maintains encapsulation precision while simplifying the overall process
3Reliability
If active ingredient is formulated at high concentrations, then therapeutic effectiveness is improved, but skin irritation and degradation increase
Solution Approach 1:
The patent nests the active ingredient within a polymer matrix structure, providing physical protection and isolation that prevents direct contact with skin while maintaining high concentrations for therapeutic effectiveness
Solution Approach 2:
The polymer matrix acts as an intermediary between the high-concentration active ingredient and the skin, controlling the release rate and preventing direct irritation while delivering the therapeutic agent over time
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 enhances the stability and controlled release of active ingredients, reducing skin irritation and enabling effective topical delivery with improved stability and tunable release profiles, suitable for large-scale production.
Implementation Method 1
agitating at least one type of silane monomer having two, three or four siloxane bonds in an acidic aqueous solution under conditions sufficient to allow for hydrolysis of the monomers
Implementation Method 2
adding a catalyst to the acidic aqueous solution. A solution comprising a co-solvent and an active ingredient is also added to the acidic aqueous solution. The combined solution is agitated to allow for a condensation reaction and formation of silicone particles
Data Source
AI summary
A composition and method is provided for synthesizing silicone particles with narrow size distributions and tunable degrees of crosslinking for encapsulation of an active ingredient or multiple active ingredients in the matrix of the particles for controlled release. The method comprises agitating at least one type of silane monomer having two, three or four siloxane bonds in an acidic aqueous solution under conditions sufficient to allow for hydrolysis of the monomers, adding a catalyst and a solution comprising a co-solvent and the active ingredient(s) to the acidic aqueous solution, and continuing to agitate the combined solution to allow for a condensation reaction and formation of silicone particles with a narrow size distribution encapsulating at least a portion of the active ingredient(s). The tunable degree of crosslink density of the particles formed is based on the ratios of the monomers used, which enables controlled release of the active ingredient(s) from the particles.