Back to results
US 9,314,745 B2Granted
Porous membrane and method for manufacturing the same
AssigneeKolon Industries, Inc.
InventorsJae Hee Ryu, Yong-Cheol Shin, Jae Hun Lee
Life of this patent
Estimating the term…
Abstract
Disclosed are a porous membrane having improved water permeability and elongation at break as well as high mechanical strength and impurity rejection rate and a method for manufacturing the same. The porous membrane of the present invention comprises a symmetric bead structure comprising a plurality of spherical crystallites. Each of the plurality of spherical crystallites comprises a plurality of sub-spherical crystallites.
Claims14
A porous membrane comprising a symmetric bead structure comprising a plurality of spherical crystallites,
- wherein each of the plurality of spherical crystallites comprises a plurality of sub-spherical crystallites.
A method for manufacturing a porous membrane, the method comprising:
- dissolving at least one polymer selected from the group consisting of polyethersulfone, polysulfone, and polyvinylidene difluoride in a poor solvent to prepare a basic solution;
- adding an ionic liquid to the basic solution to prepare a spinning dope;
- extruding the spinning dope through a spinneret;
- and
- bringing the extruded spinning dope into contact with a coagulation solution so as to form a porous structure;
- wherein the membrane comprises a symmetric bead structure comprising a plurality of spherical crystallites,
- wherein each of the plurality of spherical crystallites comprises a plurality of sub-spherical crystallites.
4 more elements
Dependencies are inferred from the claim text.