Process for making minute capsules and prefabricated system useful therein
Abstract
Abstract A PROCESS IS PROVIDED FOR PRODUCING MINUTE CAPSULES, EN MASSE, WHEREIN VOLATILE SOLVENT IS EVAPORATED FROM DROPLETS OF DISSOLVED POLYMERIC MATERIAL DISPERSED IN A LIQUID MANUFACTURING VEHICLE IMMISCIBLE WITH THE VOLATILE SOLVENT WHICH DROPLETS HAVE ENWRAPPED DISPERSED CAPSULE CORE ENTITLES. THE PROCESS INCLUDES ONLY EVAPORATION OF THE SOLVENT FROM THE SOLUTION OF POLYMERIC MATERIAL AND REQUIRES NO LIQUID-LIQUID PHASE SEPARATION. PRACTICE OF THE NOVEL PROCESS REQUIRES HAT IMPORTANT SYSTEM COMPONENTS, NAMELY, (A) MANUFACTURING VEHICLE, (B) SOLUTION OF POLYMERIC CAPSULE-WALL FORMING MATERIAL, AND (C) INTENDED CAPSULE CORE ENTITLES BE MUTUALLY IMMISCIBLE, INERT, AND MOBILE. FOR EXAMPLE, THE CORE MATERIAL MAY BE NH4NO3, THE WALL MATERIAL MAY BE NITROCELLULOSE, HE SOLVENT MAY BE METHYL ETHYL KETONE, AND THE VEHICLE MAY BE HEPTACOSAFLUOROTRIBUTYLAINE.
Inventors
- 👤 J Herbig
- 👤 J Hanny
Bibliographic Details
Claims Analysis
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