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1. (WO2013111690) MICROPOROUS MODIFIED POLYTETRAFLUOROETHYLENE FILM, POROUS MODIFIED POLYTETRAFLUOROETHYLENE RESIN FILM COMPOSITE AND METHOD FOR PRODUCING SAME, AND MEMBRANE SEPARATION ELEMENT

Pub. No.:    WO/2013/111690    International Application No.:    PCT/JP2013/051033
Publication Date: Fri Aug 02 01:59:59 CEST 2013 International Filing Date: Tue Jan 22 00:59:59 CET 2013
IPC: B01D 71/36
B01D 69/10
B01D 69/12
C08J 9/00
Applicants: SUMITOMO ELECTRIC FINE POLYMER, INC.
住友電工ファインポリマー株式会社
Inventors: HAYASHI, Fumihiro
林 文弘
OYA, Aya
大矢 彩
UNO, Atsushi
宇野 敦史
Title: MICROPOROUS MODIFIED POLYTETRAFLUOROETHYLENE FILM, POROUS MODIFIED POLYTETRAFLUOROETHYLENE RESIN FILM COMPOSITE AND METHOD FOR PRODUCING SAME, AND MEMBRANE SEPARATION ELEMENT
Abstract:
Provided is a microporous modified polytetrafluoroethylene film, which has pores having extremely small diameters with a narrow pore size distribution, and which is capable of removing fine foreign materials with high efficiency in cases where the film is used as a filtration membrane. A microporous modified polytetrafluoroethylene film, which is produced by molding a copolymer of hexafluoropropylene or a perfluoroalkyl ether and tetrafluoroethylene in an amount of not less than 50 times the molar amount of the hexafluoropropylene or perfluoroalkyl ether into a film form, heating and sintering the thus-formed film at a temperature not less than the melting point of the copolymer, and then cooling and stretching the thus-obtained sintered body, and which is characterized by having a mean flow pore diameter of 30 nm or less. A porous modified polytetrafluoroethylene resin film composite which comprises this microporous modified polytetrafluoroethylene film; a method for producing the porous modified polytetrafluoroethylene resin film composite; and a membrane separation element which uses the porous modified polytetrafluoroethylene resin film composite.