| 摘要 |
<p>A process for the production of thermoplastic resin microporous membranes by using, as part of the raw material, scrap film which is generated in producing thermoplastic resin microporous membranes by using a thermoplastic resin and a solvent for film formation and which comprises the thermoplastic resin and the solvent as the main components, which process comprises melt-kneading a virgin thermoplastic resin and a virgin solvent for film formation together in an extruder to prepare a virgin raw material solution, feeding the above scrap film generated in the same or different production process into the extruder at a point of the extruder, melt-extruding the virgin raw material solution and the scrap film together in the extruder to prepare a thermoplastic resin solution, extruding the resin solution through a die, cooling the extrudate to form a gel-like sheet, and removing the solvent from the gel-like sheet.</p> |
