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Microencapsulation process using supercritical fluids within an encapsulating polymer capable of swelling and that allows the supercritical fluid to penetrate and liquefy said polymer under a temperature and pressure sufficient to maintain the fluid in a super critical state followed by a release in
Microencapsulation process using supercritical fluids within an encapsulating polymer capable of swelling and that allows the supercritical fluid to penetrate and liquefy said polymer under a temperature and pressure sufficient to maintain the fluid in a super critical state followed by a release in
A method for microencapsulating a core material comprising the steps of a) mixing a core material with an encapsulating polymer, b) supplying a supercritical fluid capable of swelling the polymer to the mixture under a temperature and a pressure sufficient to maintain the fluid in a supercritical state, c) allowing the supercritical fluid to penetrate and liquefy the polymer while maintaining temperature and pressure sufficient to maintain the fluid in a supercritical state, and d) rapidly releasing the pressure to solidify the polymer around the core material to form a microcapsule. This method requires neither that the polymer nor core materials to be soluble in the supercritical fluid and can be used to rapidly and efficiently microencapsulate a variety of materials for a variety of applications.
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