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1. (WO2018221688) POLYTETRAFLUOROETHYLENE POROUS FILM

Pub. No.:    WO/2018/221688    International Application No.:    PCT/JP2018/021074
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Fri Jun 01 01:59:59 CEST 2018
IPC: C08J 9/00
Applicants: NITTO DENKO CORPORATION
日東電工株式会社
Inventors: INOUE Takeo
井上 健郎
Title: POLYTETRAFLUOROETHYLENE POROUS FILM
Abstract:
This polytetrafluoroethylene porous film (20) has an average pore size of 0.03-0.2 μm and a porosity of from more than 25% to 90%. The number of pores present in a region having a width of 23 μm and a thickness of 1 μm in a cross-section parallel to the direction of thickness is within the range of 40-120. The polytetrafluoroethylene porous film (20) is composed of polytetrafluoroethylene having a number-average molecular weight in the range of 200-12,000,000, and the piercing strength per unit thickness is in the range of 5.0-15 gf/μm.