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 TO FORM A NON-GELLING PRODUCT. THE PROCESS UTILIZES LIQUID-LIQUID PHASE SEPARATION IN A HOMOGENEOUS SYSTEM WHICH IS ACHIEVED BY COMBINATION, IN SOLUTION IN THE MANUFACTURING VEHICLE, OF THE POLY(VINYL ALCOHOL) AND THE CYCLKIC BORATE ESTER MATERIAL. IN THE PROCESS, COMPLEXED POLY(VINYL ALCOHOL) AND THE CYCLIC BORATE ESTER MATERIAL EMERGES FROM SOLUTION IN THE MANUFACTURING VEHICLE AS A SEPARATED LIQUID PHASE, RELATIVELY HIGH IN CONCENTRATION OF POLY(VINYL ALCOHOL) AND DISPERSED AS A DISCONTINUOUS LIQUID PHASE IN THE MANUFACTURING VEHICLE. THE SEPARATED LIQUID PAHASE, WHEN AGITATED WETS AND ENWRAPS DISPERSED, INTRODUCED, PARTICLES OF INTENDED CAPSULE CORE ENTITIES TO PRODUCE CAPSULES. OPTIONALLY, THE PRODUCED CAPSULE WALLS CAN BE CHAMICALLY TREATED WITH SOLUTIONS OF CERTAIN TRANSITION METAL SALTS TO CHEMICALLY HARDEN THE CAPSULE WALLS AND MAKE THEM SELF-SUPPORTING.
Inventors
- 👤 Robert Gordon Bayless
- 👤 Donald Day Emrick
Bibliographic Details
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