Method of making supercritical fluid molecular spray films, powd

Details Method of making supercritical fluid molecular spray films, powd Method of making supercritical fluid molecular spray films, powd

1986-03-12

1988-03-29

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Formation of solid particulate material directly from molten...

By extrusion spraying or gravity fall through orifice

264 6, 528501, 528502, B29B 910

Patent

active

047342277

ABSTRACT:
Solid films are deposited, or fine powders formed, by dissolving a solid material into a supercritical fluid solution at an elevated pressure and then rapidly expanding the solution through a heated nozzle having a short orifice into a region of relatively low pressure. This produces a molecular spray which is directed against a substrate to deposit a solid thin film thereon, or discharged into a collection chamber to collect a fine powder. In another embodiment, the temperature of the solution and nozzle is elevated above the melting point of the solute, which is preferably a polymer, and the solution is maintained at a pressure such that, during expansion, the solute precipitates out of solution within the nozzle in a liquid state. Alternatively, a secondary solvent mutually soluble with the solute and primary solvent and having a higher critical temperature than that of primary solvent is used in a low concentration (<20%) to maintain the solute in a transient liquid state. The solute is discharged in the form of long, thin fibers. The fibers are collected at sufficient distance from the orifice to allow them to solidify in the low pressure/temperature region.

REFERENCES:
patent: 3981957 (1976-09-01), van Brederode et al.
patent: 4012461 (1977-03-01), van Brederode
V. J. Krukonis, Supercritical Fluid Nucleation of Difficult-to-Comminute Solids, presented at 1984 meeting, AIChE, San Francisco, Nov. 25-30, 1984 and published Nov. 1985.

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