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Method of Forming Fluid Filled Microcapsules

Abstract: 

The invention is a process for preparing round, fluid filled microcapsules by the simultaneous extrusion, of core and shell material from coaxially aligned and concentric extrusion nozzles into a surrounding carrier fluid moving in the direction of the extrusion wherein a surfactant having affinity with the carrier fluid is added to the carrier fluid. When the carrier fluid is an oil based carrier, a lipophilic emulsifier such as a sorbitan monoester of a fatty acid can be used.

Patent Number: 
4,888,140
Date Of Issue: 
12/19/1989
Inventors: 

Wade Schlameus;Chel W. Lew