Encapsulation process and its product
Abstract
Abstract A PROCESS IS DISCLOSED FOR PRODUCING, EN MASSE, IN AN AQUEOUS MANUFACTURING VEHICLE, MINUTE CAPSULES HAVING WALLS COMPRISING THE PRODUCT OF A COMPLEXING REACTION BETWEEN POLY(VINYL ALCOHOL) AND A SLOWLY HYDROLYZABLE ALKYLENE GLYCOL CYCLIC BORATE ESTER WHICH PRODUCT IS A NON-GELLING PRODUCT. THE NOVEL PROCESS UTILIZES AND INTERFACIAL COMPLEXING REACTION WHICH IS ACCOMPLISHED AT THE INTERFACE BETWEEN A PARTICLE OF INTENDED CAPSULE INTERNAL PHASE OR CORE MATERIAL AND THE AQUEOUS LIQUID MANUFACTURING VEHICLE. IN A PREFERRED EMBODIMENT OF THE INVENTION, THE SLOWLY HYDROLYZABLE CYCLIC BORATE ESTER IS DISSOLVED IN THE INTENDED CAPSULE INTERNAL PHASE MATERIAL AND THE POLY(VINYL ALCOHOL) IS DISSOLVED IN THE AQUEOUS MANUFACTURING VEHICLE. WHEN THE INTENDED INTERNAL PHASE MATERIALS IS DISPERSED IN THE MANUFACTURING VEHICLE, A COMPLEXING REACTION OCCURS AT THE PARTICLE-VEHICLE INTERFACE BETWEEN THE CYCLIC BORATE ESTER AND THE POLY(VINYL ALCOHOL) TO CREATE A CAPSULE WALL FOR THE DISPERSED PARTICLE. OPTIONALLY, THE CAPSULE WALLS, AFTER CREATION, CAN BE CHEMICALLY TREATED WITH SOLUTIONS OF CERTAIN TRANSITION METAL SALTS TO HARDEN THE CAPSULE WALLS AND INCREASE THEIR RIGIDITY.
Inventors
- 👤 Robert Gordon Bayless
- 👤 Donald Day Emrick
Bibliographic Details
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