Process for drying and expanding microspheres

Details Process for drying and expanding microspheres Process for drying and expanding microspheres

B - Operations, Transporting

01

J

18/639

B01J 13/02 (2006.01) B01J 13/20 (2006.01) C08J 9/228 (2006.01) C08J 9/32 (2006.01)

Patent

CA 1176417

Abstract of the Disclosure A process for the preparation of uniform, free-flowing, expanded microspheres is provided by atomizing a dispersion of microspheres and an inert liquid, and contacting said atomized dispersion with hot, inert gas, the microspheres preferably having a thermoplastic shell with a liquid blow- ing agent inner core. The novel process overcomes known microsphere expan- sion processes in which non-uniform expansion occurs due to the heat insula- tion of some unexpanded particles by other particles which are already in the expanded state.

394037

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