Process for preparing polymer powders

Details Process for preparing polymer powders Process for preparing polymer powders

C - Chemistry, Metallurgy

08

J

400/2054, 260/21

C08J 3/14 (2006.01) C08F 6/12 (2006.01) C08G 85/00 (2006.01)

Patent

CA 1061498

ABSTRACT OF THE DISCLOSURE A process for producing fine polymer powders which comprises dissolving 1 to 40 weight percent of a polymer in a solvent at a temperature in the range of 90 to 165°C under autogenous conditions, cooling the solution to a temperature to precipitate the polymer and to leave in solution an amount of polymer less than that which will inhibit the formation of droplets upon atomization of the solution into a drying zone, said cooling being carried out under agitation condition- of high shear, to produce a slurry of particulate polymer and solvent, atomizing said slurry into a vaporization zone, feeding a drying gas into the vaporation zone at a temperature in the range of 90 to 160°C., recovering the partially dry polymer particles, drying the particles and recovering a polymer powder of less than 100 micron size.

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