Microcapsule Wall Formation via Oil Phase Polymerization
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Solution Overview
Problem
Current microencapsulation techniques face challenges in consistently coating solid hydrophilic core materials with precise control over wall thickness, uniform deposition, and controlled release rates, especially for water-sensitive materials.
Innovation Solution
A process involving an oil continuous phase with hydrocarbons, amine or acid acrylates/methacrylates, multifunctional monomers/oligomers, and initiators to form cationic or anionic prepolymers that migrate and cross-link onto the hydrophilic core materials, creating a controlled microcapsule wall structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional microencapsulation techniques are used to coat solid hydrophilic core materials, then capsule formation is achieved, but wall thickness control and uniform deposition are inconsistent
Solution Approach 1:
The patent changes the physical-chemical parameters of the encapsulation system by using an oil continuous phase instead of water, and by controlling the polymerization reaction parameters (monomer ratios, initiator concentration, temperature) to achieve consistent wall thickness and uniform deposition. The oil phase allows better control over the polymerization kinetics and wall formation process.
Solution Approach 2:
The patent utilizes phase transition mechanisms where the polymerization reaction transforms monomers in the oil phase into polymeric wall material that deposits onto the hydrophilic core. The phase separation between oil continuous phase and water-sensitive core material enables controlled wall formation without direct water contact.
2Adaptability or versatility
If water-based encapsulation methods are used, then hydrophilic materials can be encapsulated, but water-sensitive core materials are damaged or deactivated
Solution Approach 1:
The patent introduces an oil continuous phase as an intermediary medium between the hydrophilic core material and the polymerization reaction. This oil phase serves as a protective barrier that prevents direct water contact with water-sensitive core materials while still allowing the formation of polymeric walls through the controlled polymerization of oil-soluble monomers.
3Productivity
If release rates are increased for faster drug delivery, then therapeutic efficacy is improved, but controlled release mechanisms are compromised
Solution Approach 1:
The patent creates dynamic control over release rates by forming polymeric walls with adjustable composition and structure. The release characteristics can be tuned by modifying the polymerization parameters, monomer types, and wall thickness, allowing the system to adapt between controlled sustained release and faster release profiles based on therapeutic requirements.
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 method enables the formation of microcapsules with consistent wall thickness and controlled release properties, effectively encapsulating water-sensitive materials without direct contact with water, providing structural protection and delayed release mechanisms.
Implementation Method 1
heating the mixture for a time sufficient to enable the amine acrylate or methacrylate and the multifunctional acrylate or methacrylate to form a cationic prepolymer
Implementation Method 2
the cationic prepolymer migrates to the solid hydrophilic material, thereby forming prepolymer adhered to the hydrophilic core materials
Implementation Method 3
heating for a time and temperature sufficient to cross link the prepolymers
Data Source
AI summary
A process of forming microcapsules is described. The microcapsule population is formed by providing an anionic or cationic, solid hydrophilic core material; providing an oil continuous phase, the oil continuous phase comprising one or more esters with chain length up to about 18 carbons. Emulsification is achieved by subjecting the mixture to high shear agitation and heating the mixture for a time sufficient to enable acid or amine acrylate or methacrylate and multifunctional acrylate or methacrylate to form a prepolymer which migrates to the anionic or cationic solid hydrophilic material, thereby forming prepolymers adhered to the hydrophilic core materials. Temperature is held or heating continued for a time sufficient to enable the prepolymer to flow onto and coalesce into a continuous film surface coating on the hydrophilic core material. Heating is carried out or light exposure or both for a time and temperature sufficient to cross link the prepolymers.