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US 9,393,529 B2Granted
Method of forming a hydrophilic membrane
Assignee3M Innovative Properties Company
InventorJinsheng Zhou
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Abstract
The present disclosure provides methods for forming hydrophilic membranes. More specifically, methods are provided for hydrophilic membranes from a solution comprising an ethylene-vinyl alcohol copolymer, water, and a first solvent. At least a portion of the first solvent is removed from the porous substrate at a temperature no greater than 500 C. for forming a hydrophilic membrane.
Claims18
A method of forming a hydrophilic membrane comprising:
- providing a hydrophobic porous substrate, wherein the porous substrate comprises polypropylene;
- applying a solution to the hydrophobic porous substrate, the solution consisting essentially of
- i) an ethylene-vinyl alcohol copolymer;
- ii) water;
- and
- iii) a first solvent, the first solvent miscible with water and having a boiling point less than the boiling point of water, wherein the first solvent comprises alcohols selected from methanol, ethanol, isopropanol n-propanol, or combinations thereof;
- and
- removing at least a portion of the first solvent from the porous substrate at a temperature no greater than 40° C. to provide the hydrophilic membrane, wherein the hydrophilic membrane has a surface energy greater than 60 dynes/centimeter.
5 more elements
Dependencies are inferred from the claim text.