POLYTETRAFLUOROETHYLENE POROUS FILM, POROUS FLUORINE RESIN FILM COMPOSITE, AND METHOD FOR PRODUCING THEM

摘要

PROBLEM TO BE SOLVED: To provide a PTFE porous film having≤50 nm mean flow pore diameter, a porous fluorine resin film composite containing the PTFE porous film having≤50 nm mean flow pore diameter and a method for producing the PTFE porous film having a smaller pore diameter of≤50 nm mean flow pore diameter by stretching the PTFE under a condition in which the stretching was impossible until now. SOLUTION: This polytetrafluoroethylene porous film having≤50 nm mean flow pore diameter, and the porous fluorine resin film composite consisting of the polytetrafluoroethylene porous film and a porous material bonded/fixed to the same are provided. The method for producing the polytetrafluoroethylene porous film or the porous fluorine resin film composite is provided by comprising a process of fixing a non-porous film consisting of a polytetrafluoroethylene having≥32 J/g amount of the heat of fusion and having≤20μm film thickness on a supporting body having a characteristic of elongating uniformly by stretching to obtain a laminate body and a process of stretching the laminate body. COPYRIGHT: (C)2011,JPO&INPIT