Process for preparing polymer powders

Details Process for preparing polymer powders Process for preparing polymer powders

1975-08-06

1977-03-15

Holler, Alan

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

264 8, 264 12, 264 13, 528497, 528498, 528501, 528503, C08F 610, C08F25502, C08J 312

Patent

active

040124614

ABSTRACT:
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.degree. to 165.degree. 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 conditions 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.degree. to 160.degree. C, recovering the partially dry polymer particles, drying the particles and recovering a polymer powder of less than 100 micron size.

REFERENCES:
patent: 3119801 (1964-01-01), Haskell
patent: 3244687 (1966-04-01), Spindler
patent: 3306342 (1967-02-01), DiSalvo et al.
patent: 3563975 (1971-02-01), Zavasnik
patent: 3743272 (1973-07-01), Nowotny et al.
patent: 3849516 (1974-11-01), Plank
patent: 3862265 (1975-01-01), Steinkamp et al.
patent: 3882095 (1975-05-01), Fowells et al.
patent: 3891499 (1975-06-01), Kato et al.
patent: 3896196 (1975-07-01), Dickey et al.

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