| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for producing a polyvinyl acetal-based porous body that prevents clogging of pores, ensures sufficient permeability with comparatively low pressure, also achieves excellent heat stability and chemical resistance and sufficient strength of a film, and removes fine particles such as bacteria. <P>SOLUTION: The production method includes the steps of: obtaining a uniform polymer solution by heating a mixture containing a first polyvinyl acetal-based resin, a second polyvinyl acetal-based resin which uses an acetalization agent different from the one used in the first polyvinyl acetal-based resin, and a solvent; obtaining a molded product by molding the polymer solution into a predetermined shape; causing phase separation by cooling the molded product; and extracting and removing the solvent present in the phase-separated molded product by using an extractant capable of dissolving the solvent. <P>COPYRIGHT: (C)2013,JPO&INPIT |
