Water solubilization of vanadyl-hardened poly(vinyl alcohol) films useful as capsule wall material
Abstract
Abstract A PROCESS IS DISCLOSED FOR MANUFACTURING, EN MASSE, MINUTE CAPSULES HAVING WALLS WHICH ARE COLD WATER SOLUBLE. MORE SPECIFICALLY DISCLOSED IS A PROCESS FOR TREATING ALREADY-FORMED CAPSULE WALLS COMPRISING WATER-INSOLUBILIZED VANADYL (IV)-HARDENED POLY (VINYL ALCOHOL), WHEREIN THE VANADYL IONS ARE OXIDIZED TO A VALENCE NUMBER SUCH THAT THE VANADIUM NO LONGER SERVES TO RENDER THE POLY(VINYL ALCOHOL) WATER INSOLUBLE. IN ONE DISCLOSED EMBODIMENT, DRY WALLED CAPSULES WHICH HAD PREVIOUSLY BEEN VANADYL (IV)-HARDENED ARE TREATED BY OXIDIZING THE VANADIUM SO THAT THE THUS-TREATED CAPSULE WALLS ARE SOLUBLE, ON LATER CONTACT, WITH COLD WATER. IN OTHER EMBODIMENTS, OXIDIZING MATERIALS ARE USED IN COMBINATION WITH THE WATER-INSOLUBILIZED CAPSULE WALL MATERIAL TO RENDER THE VANADYL (IV)-HARDENED CAPSULE WALL MATERIAL WATER SOLUBLE UPON FIRST CONTACT OF WATER WITH THE COMBINATION OF MATERIALS. THE POLYMERIC CAPSULE WALL MATERIAL WHICH IS DISCLOSED IN THE PRESENT INVENTION IS POLY (VINYL ALCOHOL) POLYMERIC MATERIAL WHICH HAS BEEN INITIALLY INSOLUBILIZED TY COMPLEXING WITH HYDROUS VANADYL (IV) COMPOUNDS.
Inventors
- 👤 Robert G Bayless
- 👤 Donald D Emrick
- 👤 Ronald L Hart
Bibliographic Details
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