Cellulose ester microparticles and process for making the same
AssigneeHoechst Celanese Corporation
InventorsThomas L. Steiner, Kenneth A. Domeshek, William Stitt, Jesse L. Riley, Lance J. Deutsch
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Abstract
Cellulose ester microparticles with unique properties are made by a process having the following steps: (a) dissolving a cellulose ester in a liquid comprising a solvent for the cellulose ester and a non-solvent for the cellulose ester, thereby forming a dope; (b) spheronizing the dope thereby forming fine droplets of the dope; (c) dropping the droplets for a finite amount of time; and (d) precipitating the droplets in a bath containing a precipitant.
Claims2
A spherical porous microparticle of a cellulose organic ester characterized by having a plurality of exterior surface pores having diameters of between about 1.0 to about 6.0 microns and being present in an amount of between about 1% to about 10% of the exterior surface thereof.
Dependencies are inferred from the claim text.