MANUFACTURING METHOD OF POROUS FILM

• Main Authors: SUZUKI KOTARO, YAMADA TAKAHIRO, HARADA KATSUYOSHI, SEKI RYOICHI
• Format: Patent
• Language: English; Japanese
• Published: 17.09.2020
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

To provide a porous film having excellent gas permeability, film appearance and mechanical characteristics, and furthermore having excellent affinity with an electrolytic solution.SOLUTION: A manufacturing method of a porous film having the porosity of 46 to 80% includes the steps of: (1) obtaining a melt kneaded subject by melting and kneading specific particles (S) and a plasticizer; (2) obtaining a sheet by forming the melt kneaded subject into a sheet shape; (3) obtaining a stretched film by stretching the sheet; (4) removing the plasticizer from the stretched film; and (5) performing a heat treatment to the stretched film after the (4).SELECTED DRAWING: None 【課題】気体透過性、フィルム外観および機械的特性に優れ、しかも電解液との親和性に優れた多孔質フィルムを提供する。【解決手段】特定の粒子（Ｓ）と可塑剤とを溶融混錬して溶融混練物を得る工程（１）；前記溶融混練物をシート形状に成形して、シートを得る工程（２）；前記シートを延伸して、延伸フィルムを得る工程（３）；前記延伸フィルムから前記可塑剤を除去する工程（４）；および前記工程（４）後、前記延伸フィルムに熱処理を行う工程（５）を有する、空隙率が４６〜８０％である多孔質フィルムの製造方法。【選択図】なし