Daikin Industries, Ltd.

Asahi Kasei Kabushiki Kaisha

Nobuki Uraoka

Shinichi Chaen

Osamu Inoue

Jun Asano

Toshio Kusumi

Osamu Tanaka

Katsutoshi Yamamoto

Tomohisa Konishi

Tadashi Ino

Yuichi Inoue

Kuon Miyazaki

Kentaro Kikuchi

Makoto Ono

Taku Yamanaka

Masahiko Yamada

Yoshiyuki Shibuya

Seiichi Hirano

Kunihiko Inui

Shinji Tamaru

Satoshi Hara

Norihito Tanaka

Kohei Yasuda

The present invention provides a polymer electrolyte membrane having excellent strength, a small dimensional change, and a low membrane resistance. The polymer electrolyte membrane includes a porous film having pores and a polymer electrolyte contained in the pores. The porous film is obtained by copolymerizing tetrafluoroethylene and an ethylenic comonomer to provide polytetrafluoroethylene and then stretching the polytetrafluoroethylene. The porous film has an average pore size of greater than 0.20 &#x3bc;m.

Polymer electrolyte film

The present invention provides a porous body having high strength, a small pore size, and excellent homogeneity. The porous body of the present invention includes polytetrafluoroethylene and has a microstructure that includes nodes and fibrils. The microstructure further includes, in addition to the nodes and the fibrils, fused points where a fibril that links two nodes and another fibril that links another two nodes are fused with each other.

Porous body, polymer electrolyte membrane, filter material for filter, and filter unit

The present invention provides a polymer electrolyte membrane having excellent strength, a small dimensional change, and a low membrane resistance. The polymer electrolyte membrane includes a porous film and a polymer electrolyte. The porous film has a fibril/node area ratio of 90/10 to 75/25.

Polymer electrolyte membrane

A method of laminating at least two gas permeable sheet materials includes: (1) providing at least a first gas permeable sheet material, wherein at least a portion of at least a surface region of the first sheet material is thermoplastic material; (2) providing at least a second gas permeable sheet material of polytetrafluoroethylene; (3) superposing the sheet materials; and (4) contacting the sheet materials with a heating means to heat the thermoplastic material to a temperature from 140&deg; to 230&deg; C., so as to melt the thermoplastic material and laminate the sheet materials to one another, without the application of direct pressure in the thickness direction of the sheet materials during the contacting step so as to form a gas permeable laminate.

Method of laminating gas permeable sheet material

A filter medium with excellent flame-resistant properties and an air filter unit using the same are provided which have a flame-resistant air permeable supporting material on at least one surface of a polytetrafluoroethylene (PTFE) porous film and which can be used as a ceiling device, etc.

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Settsu, Japan

Nobuki Uraoka