Method of making microscopic capsules

Abstract

Abstract THE PROCESS OF FORMING MINUTE CAPSULES EN MASSE WHICH COMPRISES (A) ESTABLISHING AN AGITATED SYSTEM CONSISTING OF A LIQUID POLAR VEHICLE CONSTITUTING A CONTINUOUS FIRST PHASE, A SECOND PHAE DISPERSED THEREIN CONSISTING OF MINUTE MOBILE ENTITIES OF CORE MATERIAL, AND A THIRD PHASE DISPERSED THEREIN CONSISTING OF MINUTE, MOBILE LIQUID ENTITIES OF A WALL-FORMING SOLUTION OF A NON-POLAR POLYMERIC MATERIAL, THE SAID CORE MATERIAL BEING WETTABLE BY SAID WALL-FORMING SOLUTION, THE SAID THREE PHASES BEING MUTUALLY INCOMPATIBLE, THE THIRD PHASE CONSTITUTING SUCH A PART OF THE TOTAL THREE-PHASE SYSTEM, BY VOLUME THAT IT CAN EXIST AS A DISPERSED PHASE OF MINUTE MOBILE ENTITITES CAPABLE OF AND SUFFICIENT IN AMOUNT TO DEPOSIT AROUND THE CORE ENTITIES, AND WHEREIN THE WALL-FORMING POLYMERIC MATERIAL HAS A DECREASING SOLUBILITY WITH INCREASING TEMPERATURE IN THE VEHICLE, AND WHEREIN THE THIRD PHASE IS MAINTAINED AS SUCH, AT LEAST IN PART, BY THE PRESENCE OF A POLYELECTROLYTE POLYMER (B) HARDENING THE WALLS SO FORMED BY ELEVATING THE TEMPERATURE OF THE SYSTEM TO A TEMPERATURE ABOVE THE GEL POINT OF THE WALL-FORMING POLYMER, AND (C) SEPARATING THE HARDENED CAPSULES FROM THE REST OF THE SYSTEM AS A TEMPERATURE ABOVE THAT AT WHICH RESOLUTION OF THE CAPSULE WALLS TAKES PLACE TO ANY SUBSTANTIAL DEGREE.

Inventors

• 👤 Rene Karl Himmel

Bibliographic Details