| 摘要 |
PURPOSE:To obtain a porous membrane suitable as a filter membrane, etc., standing steam washing, etc., by forming a porous membrane of a precondensate of thermosetting resin by a specific operation, drying and polymerizing under heating. CONSTITUTION:A precondensate of a thermosetting resin (e.g., polyaminobismaleimide, etc.,) is dissolved in a water-soluble organic solvent, the solution is impregnated into a heat-resistant fibrous material (e.g., glass fibers, carbon fibers, etc.,) or applied to a carrier (e.g., synthetic resin film, etc.,), immersed in water and the water-soluble organic solvent is extracted to form a porous membrane. This membrane is dried and polymerization is completed by heating.
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