Manufacturing method of porous medium of olefin-based resin, manufacturing method of separator for battery, and manufacturing apparatus
AssigneesToyota Jidosha Kabushiki Kaisha, Fukuoka Institute of Technology
InventorsKohei Matsunobu, Kiyoshi Matsuyama
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Abstract
A polymer solution is created by mixing an olefin-based resin and a solvent in a pressure vessel. A high-pressure fluid of carbon dioxide is created. Temperature of the high-pressure fluid is adjusted. A mixed fluid is created by mixing the high-pressure fluid of which the temperature is adjusted and the polymer solution in the pressure vessel. Cooling of the mixed fluid causes phase separation of the mixed fluid to occur. After phase separation, pressure in the pressure vessel is released, and the solvent and the carbon dioxide vaporize. The vaporizing of the solvent and the carbon dioxide creates a porous medium of olefin-based resin.
Claims11
A manufacturing method of a porous medium of an olefin-based resin, the manufacturing method comprising steps of:
- (a) preparing a polymer solution by mixing the olefin-based resin and a solvent in a pressure vessel;
- (b) creating a high-pressure fluid of carbon dioxide;
- (c) adjusting a temperature of the high-pressure fluid;
- (d) preparing a mixed fluid by mixing the high-pressure fluid of which the temperature is adjusted, and the polymer solution, in the pressure vessel;
- (e) cooling the mixed fluid to cause phase separation of the mixed fluid;
- and
- (f) vaporizing the solvent and the carbon dioxide following the phase separation, by releasing pressure in the pressure vessel, wherein the vaporizing of the solvent and the carbon dioxide in the step (f) produces the porous medium of the olefin-based resin.
Dependencies are inferred from the claim text.