ポリテトラフルオロエチレン多孔質膜およびその製造方法

Polytetrafluoroethylene porous film and method of manufacturing the same

Abstract

【課題】通気性と耐水圧が高度にバランスしたPTFE多孔質膜を得ることができるPTFE多孔質膜の製造方法を提供する。 【解決手段】PTFEからなる未焼成シートを第1方向に延伸した後に第2方向に延伸するPTFE多孔質膜の製造方法において、前記第2方向の延伸前には前記未焼成シートに対してPTFEの結晶融点以上での処理を行わず、前記第2方向の延伸をPTFEの結晶融点以上で行う。これにより、JIS P 8117(1998)に準拠して測定した通気量が1.0秒/100mL以下であり、JIS L1092−B(高水圧法)に準拠して測定した耐水圧が100kPa以上であるPTFE多孔質膜を得ることができる。 【選択図】図1
PROBLEM TO BE SOLVED: To provide a method of manufacturing a PTFE porous film that can obtain the PTFE porous film in which air permeability and water pressure resistance are highly balanced.SOLUTION: In the method of manufacturing the PTFE porous film in which an uncalcined sheet consisting of PTFE is drawn to a first direction, and then is drawn to a second direction, the treatment at the crystal melting point or higher of PTFE is not performed to the uncalcined sheet before drawing of the second direction, and the drawing of the second direction is performed at the crystal melting point or higher of PTFE. As a result, the PTFE porous film can be obtained whose quantity of airflow measured in accordance with JIS P 8117(1998) is 1.0 second/100 mL or less, and whose water resistance pressure measured in accordance with JIS L1092-B (high water pressure method) is 100 kPa or more.

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