Formulation of fine particles using liquefield or dense gases

Details Formulation of fine particles using liquefield or dense gases Formulation of fine particles using liquefield or dense gases

2011-01-04

2011-01-04

Michener, Jennifer K (Department: 1795)

Plastic and nonmetallic article shaping or treating: processes

Formation of solid particulate material directly from molten...

C424S489000

Reexamination Certificate

active

07862751

ABSTRACT:
The invention provides a method for manipulating or formulating a solid substance which melts under pressure of a gas without degrading at a temperature lower than the melting point of the substance at atmospheric pressure including: applying to the substance a liquefied gas or dense gas to melt the substance without degrading the substance; then contacting the molten substance with a carrier fluid, which is at substantially the same pressure as the liquefied gas or dense gas, to form a solution or mixture of at least a part of the molten substance and the carrier fluid; and passing the solution or mixture into a vessel of lower pressure than the pressure of the liquefied gas or dense gas and carrier fluid to form particles of the substance; and particles formed by the method.

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Ker{hacek over (c)} et al., “Micronization of drugs using supercritical carbon dioxide,” International Journal of Pharmaceutics, 182 (1999), pp. 33-39.
Jung, Jennifer and Michel Perrut. “Particle design using supercritical fluids: Literature and patent survey.” Journal of Supercritical Fluids 20 (2001) 179-219.
Thiering et al., The influence of operating conditions on the dense gas precipitation of model proteins,J. of Chemical Technology and Biotechnologyvol. 75(1), pp. 29-41, 2000.

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