Encapsulation process and its product
Abstract
Abstract A PROCESS IS PROVIDED FOR MANUFACTURING MINUTE CAPSULES, EN MASSE, IN A LIQUID MANUFACTURING VEHICLE, WHICH CAPSULES HAVE WALLS OF A SUBSTANTIALLY HOMOGENEOUS SOLID SOLUTION OF AT LEAST TWO POLUMERIC MATERIALS. THE NOVEL PROCESS INCLUDES A LIQUID-LIQUID PHASE SEPARATION WHICH IS ACCOMPLISHED BY HEATING A SOLUTION OF TWO POLYMERIC MATERIALS IN AN ORGANIC SOLVENT. THE POLYMERIC MATERIALS COMPRISE POLYMERIC CAPSULE WALL MATERIAL, VIZ, HALOGENATED RUBBER, AND POLYMERIC LIQUID-LIQUID PHASESEPARATION-INDUCING MATERIAL, VIZ, POLY (ETHYLENE-CO-VINYL ACETATE) OR POLY (VINYLMETHYL ETHER), WHICH DISSOLVE TOGETHER AS A SINGLE PHASE IN THE MANUFACTURING VEHICLE BELOW A CERTAIN PHASE SEPARATION TEMPERATURE AND WHICH EXIST, ABOVE THE PHASE SEPARATION TEMPERATURE, AS SEPARATED COMPONENTS OF TWO LIQUID PHASES.
Inventors
- 👤 Antoinette M Purcell
Bibliographic Details
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