ENCAPSULATION BY INTERFACIAL POLYCONDENSATION
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Abstract
PROCEDURE FOR ENCAPSULATION OF MATERIALS INITIALLY EMBODIED, CONTAINED OR CARRIED IN LIQUID IS EFFECTED BY INTERFACIAL POLYCONDENSATION BETWEEN COACTING INTERMEDIATES RESPECTIVELY IN IMMISCIBLE LIQUIDS, DROPLETS OF ONE LIQUID WHICH IS TO BE ENCAPSULATED AND WHICH CONTAINS ONE INTERMEDIATE BEING FIRST ESTABLISHED IN A BODY OF THE OTHER LIQUID. THEREAFTER THE SECOND INTERMEDIATE IS INCORPORATED IN THE OTHER LIQUID TO PRODUCE MINUTE CAPSULES OF THE FIRST LIQUID HAVING A SKIN OF POLYCONDENSATE, E.G. POLYAMIDE, POLYSULFONAMIDE, POLYESTER, POLYCARBONATE, POLYURETHANE, OR POLYUREA. NOTABLY EFFECTIVE OPERATION INVOLVES CONTINUOUSLY SUPPLYING BOTH THE FIRST LIQUID CONTAINING THE FIRST INTERMEDIATE, AND THE SECOND LIQUID, INTO A REGION WHERE CONTINOUS AGITATION EFFECTS DISPERSION OF THE FIRST LIQUID AS DROPLETS, THE DISPERSION BEING CONTINUOUSLY BROUGHT TOGETHER WITH THE SECOND INTERMEDIATE, THEREBY CONTINUOUSLY ESTABLISHING THE DROPLET DISPERSION IN LIQUID CONTAINING THE SECOND INTERMEDIATE, AND IN CONSEQUENCE CONTINUOUSLY PRODUCING ENCAPSULATED DROPLETS BY INTERFACIAL POLYCONDENSATION BETWEEN THE INTERMEDIATES.
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