Patent ID: 9050579
Filing Date: 2015-06-09
Classification: B01J

Abstract:
1. A method for making a fabricated hollow microsphere comprising: forming a nascent hollow microsphere having a total diameter greater than about 200 microns and less than about 3000 microns, where the nascent hollow microsphere is comprised of, exposing the nascent hollow microsphere to a gaseous environment for at least 0.15 seconds and less than 0.5 seconds, where the gaseous environment is inert relative to the dope layer, and where a partial pressure of the volatile in the gaseous atmosphere is less than the vapor pressure of the volatile, thereby forming a vitrified hollow microsphere; and immersing the vitrified hollow microsphere in a coagulation bath, where the coagulation bath is comprised of a second non-solvent, where the polymer is poorly soluble in the second non-solvent, and where the second non-solvent is miscible with the first solvent and the second solvent, and where the second non-solvent has a kinetic diameter less than about 0.5 nm, thereby forming the fabricated hollow microsphere.