Nitto-denko Corporation

Takeda Pharmaceutical Company Limited

Otsuka Pharmaceutical Company, Limited

Takeda Chemical Industries, Inc.

Masaaki Mori

Yukio Shimomura

Yasuhiro Kubo

Tsukasa Sugo

Chieko Kitada

Satoru Furuyama

Yuri Horie

Tamotsu Hamao

Kazunori Tsutsui

Atsushi Daimon

Shiho Wada

Takashi Niki

Hirokazu Matsumoto

Ryo Fujii

Toshiki Yanagi

Yasushi Zasu

Mika Goto

Eiji Ikegami

Mioko Harada

Takuya Watanabe

Shuji Hinuma

Hajime Yamamoto

Nobuhiro Suzuki

Kaneyoshi Kato

Taiji Asami

Toshimitsu Tachibana

Kazunori Nishi

Yuichi Abe

Shiro Takekawa

Katsuhiro Morisawa

Shunsuke Masaki

Shuji Sato

Nobuharu Kuki

Yoshio Matsumoto

Toshimi Nagi

Takashi Maruyama

Yuka Adachi

Michiko Abe

Akira Tanaka

Mitsuhiro Wakimasu

Yozo Nagai

Yuji Ishihara

Yukio Arimitsu

Hiroshi Banno

Masashi Kobayashi

Yasushi Shintani

Naoki Tarui

Shoji Fukusumi

Jun Terauchi

Yoshiki Ikeyama

Osamu Kurasawa

Mitsuru Kakihana

Masatoshi Suzuki

Yutaka Nakayama

Yoshihiro Ishibashi

Toshiro Yamashita

Masahiro Arai

Yasuaki Itoh

Bunta Hirai

Shunichi Shimatani

Hiromi Yoshida

Kohji Fukatsu

Kousei Takiishi

Akira Kawada

Kimiko Kanehashi

Yuuichi Abe

Keiko Fujiwara

Yasuhiro Tanaka

Kazuaki Mochida

Shiho Uchiyama

Shoichi Okubo

Yuuzou Muraki

Eri Hashimoto

Kozo Hayashi

Hiroyuki Miya

Tomoko Chikatsu

Masahiko Miyoshi

Hiroaki Mizui

Yusuke Ikemura

Go Sato

Hidetoshi Komatsu

Minoru Maruyama

Masao Ninomiya

Tomokuni Inoue

Masayuki Tani

Tetsuo Asano

Nobuhiro Matsunaga

Chieko c/o Takeda PharmCoLtd Kitada

A provided air filter medium is an air filter medium including a porous fluorine resin membrane, the air filter medium further including: a glass filter medium layer. The glass filter medium layer and the porous fluorine resin membrane are placed in this order from upstream to downstream of the air filter medium configured to allow an air flow to pass through the air filter medium. At a surface of the glass filter medium layer on an upstream side in a direction of the air flow, a carbon-to-silicon ratio (C/Si) evaluated by X-ray fluorescent analysis is 0.020 or more. This air filter medium is suitable for reducing a pressure drop increase even in an environment including liquid particles such as oil mist.

Air filter medium, filter pleat pack, and air filter unit

A filter medium of the present disclosure has a laminate structure composed of a first polytetrafluoroethylene (PTFE) porous membrane, a first air-permeable supporting member, a second PTFE porous membrane, and a second air-permeable supporting member laminated in this order. The first PTFE porous membrane constitutes an exposed surface of the filter medium. A ratio of a transmittance of the first PTFE porous membrane to a transmittance of the second PTFE porous membrane is 100 or more. The filter medium of the present disclosure is a filter medium which includes the PTFE porous membranes, from which dust deposited on a surface over a period of use can be easily removed, and which has excellent reusability demonstrated by reduction of a filtration performance decrease caused by removal of dust.

Filter medium and filter unit

Provided is a waterproof gas-permeable membrane () having higher levels of both gas permeability and waterproofness than conventional ones. The waterproof gas-permeable membrane () includes: a non-porous resin film () having through holes (to) formed to extend through the thickness of the resin film (); and a liquid-repellent layer () formed on a principal surface of the resin film () and having openings () positioned in register with the through holes (to). The through holes (to) extend straight and have a diameter of 15 &#x3bc;m or less. The through holes (to) are distributed at a hole density of 1&#xd7;10holes/cmor more and 1&#xd7;10holes/cmor less in the resin film (). The through holes (to) extend in oblique directions with respect to a direction perpendicular to the principal surface of the resin film (). The through holes (to) that extend in different oblique directions are present together.

Waterproof gas-permeable membrane, waterproof gas-permeable member and waterproof gas-permeable structure including same, and waterproof sound-permeable membrane

An air filter medium includes a first porous PTFE membrane and a second porous PTFE membrane. The air filter medium has a first main surface and a second main surface, and the first porous PTFE membrane and the second porous PTFE membrane are arranged so that an air flow moving from the first main surface to the second main surface passes through the first porous PTFE membrane and subsequently through the second porous PTFE membrane. A proportion of areas occupied by the plurality of nodes on a surface of the first porous PTFE membrane is in the range of 1.5 to 3.0% and an average of the areas of the plurality of nodes is 200 &#x3bc;m2 or more.

Air filter medium, air filter pack, and air filter unit

An air filter medium includes a first porous PTFE membrane and a second porous PTFE membrane. The air filter medium has a first main surface and a second main surface, and the first porous PTFE membrane and the second porous PTFE membrane are arranged so that an air flow moving from the first main surface to the second main surface passes through the first porous PTFE membrane and subsequently through the second porous PTFE membrane. A contact angle of the first porous PTFE membrane with water is in the range of 154&#xb0; to 165&#xb0;.

The air filter medium of the present invention is an air filter medium including a stack of a porous polytetrafluoroethylene (PTFE) membrane and an air-permeable support member, a repulsive force generated in the medium when the medium is compressed in a thickness direction thereof is equal to or greater than 30 kPa and equal to or less than 150 kPa at a compression ratio of 30%, and at least one main surface of the air filter medium is formed by the air-permeable support member and has a maximum coefficient of friction of 24 gf or less. The air filter medium of the present invention is an air filter medium that uses a porous PTFE membrane and in which a decrease in collection efficiency due to pleating is inhibited.

An air filter medium includes a first porous PTFE membrane and a second porous PTFE membrane. The air filter medium () has a first main surface and a second main surface, and the first porous PTFE membrane and the second porous PTFE membrane are arranged so that an air flow moving from the first main surface to the second main surface passes through the first porous PTFE membrane and subsequently through the second porous PTFE membrane. A thickness of the first porous PTFE membrane is in the range of 4 to 40 &#x3bc;m and a specific surface area of the first porous PTFE membrane is 0.5 m/g or less.

An air filter medium includes a first porous PTFE membrane and a second porous PTFE membrane. An average fiber diameter of fibers included in the first porous PTFE membrane is 0.24 to 0.45 &#x3bc;m, an average fiber diameter of fibers included in the second porous PTFE membrane is 0.04 to 0.23 &#x3bc;m, the air filter medium has a first main surface and a second main surface, and the first porous PTFE membrane and the second porous PTFE membrane are arranged so that an air flow moving from the first main surface to the second main surface passes through the first porous PTFE membrane and subsequently through the second porous PTFE membrane.

The polymer film of the present invention has through holes extending from one principal surface of the polymer film to the other principal surface of the polymer film. The through holes are straight holes having a central axis extending straight, and have a shape in which the area of a cross-section perpendicular to the direction of the central axis increases from the one principal surface of the polymer film toward the other principal surface. This polymer film has passages in its thickness direction, has an unconventional structure, and can be used in various applications, such as in a waterproof sound-permeable membrane, in a waterproof gas-permeable membrane, and in a suction sheet. The ratio a/b of the opening diameter a of the through holes at the one principal surface to the opening diameter b of the through holes at the other principal surface is 80% or is less than 80%.

Polymer film, waterproof sound-permeable membrane, waterproof sound-permeable member, electronic device, electronic device case, waterproof sound transmission structure, waterproof gas-permeable membrane, waterproof gas-permeable member, waterproof ventilation structure, suction sheet, method for holding workpiece by suction on suction unit, method for producing ceramic capacitor, optical film, optical member, and composition

The sound-permeable membrane of the present invention is adapted, when placed over an opening for directing sound to or from a sound transducer, to prevent entry of foreign matters into the sound transducer through the opening while permitting passage of sound, the sound-permeable membrane including a non-porous film or a multilayer membrane including the non-porous film. The non-porous film is formed of oriented polytetrafluoroethylene. This sound-permeable membrane has an unconventional configuration and exhibits various excellent properties. At least one principal surface of the non-porous film may have a region subjected to a surface modification treatment.

Sound-permeable membrane, sound-permeable membrane member including same, microphone, and electronic device

A waterproof sound-transmitting membrane of the present disclosure includes: a non-porous resin film having formed therein a plurality of through holes extending through a thickness of the non-porous resin film; and a liquid-repellent layer formed on a principal surface of the resin film and having openings at positions corresponding to positions of the plurality of through holes. The through holes have a diameter of 4.0 &#x3bc;m or more and 12.0 &#x3bc;m or less, and the waterproof sound-transmitting membrane has a through-thickness air permeability of 2.0 cm/(cm&#xb7;second) or more and 50 cm/(cm&#xb7;second) or less in terms of Frazier number as measured according to JIS L 1096. With this waterproof sound-transmitting membrane placed over an opening of a housing of an electronic device or the like, entry of water into the housing from outside can be prevented, in addition to which the characteristics of sound transmitted through the membrane can be kept even when the membrane has a reduced effective area.

Waterproof sound-transmitting membrane, waterproof sound-transmitting member including same, electronic device, electronic device case, and waterproof sound-transmitting structure

An acoustic resistor for use in an audio device includes a resin film having air permeability in a thickness direction of the resin film, and the resin film is a non-porous film having through holes formed to extend straight through the resin film in the thickness direction. This acoustic resistor is used in an audio device including: a transducing part that performs conversion between sound and an electrical signal and that includes an acoustic element; a housing enclosing the transducing part and having at least one opening; and a passage for gas that is present inside the housing and communicates with the opening and in which the acoustic element is placed. The acoustic resistor is placed between the opening and the acoustic element in the passage. The variation in properties of the acoustic resistor of the present disclosure can be made smaller than that of conventional acoustic resistors.

Acoustic resistor, acoustic resistor member including same, and audio device including same

A waterproof member () includes a first adhesive layer (), a second adhesive layer (), and a porous layer (). The porous layer () is disposed between the first adhesive layer () and the second adhesive layer (). The first adhesive layer () and the second adhesive layer () each have a frame shape in plan view. When the first adhesive layer (), the second adhesive layer (), and the porous layer () are seen in plan view, the outer boundary of the porous layer () lies within the outer boundary of the first adhesive layer () and the outer boundary of the second adhesive layer (). The first adhesive layer () is bonded directly to the second adhesive layer () in a region outside the outer boundary of the porous layer (). The porous layer () has a peripheral surface that is shielded from outside by the first adhesive layer () and the second adhesive layer ().

Waterproof member and electronic device including the waterproof member

The sound-transmitting structure () of the present invention includes a sound-transmitting membrane () that allows passage of sounds and prevents passage of foreign matters and a case () having a sound-transmitting opening (). This sound-transmitting membrane () includes a supporting member () that is a nonwoven fabric containing an elastomer and a porous resin membrane () disposed on the supporting member () and containing polytetrafluoroethylene as a main component. The sound-transmitting membrane () covers the sound-transmitting opening () with the supporting member () welded to the case ().

Sound-transmitting structure, sound-transmitting membrane, and waterproof case

Provides is a waterproof sound-permeable membrane () adapted to permit passage of sound and prevent entry of water. The waterproof sound-permeable membrane () includes a sound-permeation region () having a polytetrafluoroethylene (PTFE) membrane (). The polytetrafluoroethylene membrane () has an average pore diameter of 0.02 &#x3bc;m or more and 0.1 &#x3bc;m or less as measured according to ASTM F316-86 and has a porosity of 5% or more and 25% or less. The waterproof sound-permeable membrane () is suitable for application to an electronic device containing an acoustic device.

Waterproof sound-permeable membrane and electronic device

Growing community of inventors

Osaka, Japan

Masaaki Mori