Back to results
US 5,047,180 AGranted
Process for making cellulose ester microparticles
AssigneeHoechst Celanese Corporation
InventorsThomas L. Steiner, Kenneth A. Domeshek, William Stitt, Jesse L. Riley, Lance J. Deutsch
Life of this patent
Estimating the term…
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.
Claims23
A process for producing cellulose ester microspheres comprising the steps of:
- (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 droplets of the dope;
- (c) droping the droplets for a finite amount of time;
- and
- (d) precipitating the droplets in a precipitant.
2 more elements
Dependencies are inferred from the claim text.