Nitto-denko Corporation

Yoshiki Ikeyama

Youzou Yano

Nobuaki Maruoka

Asuka Onohara

Masaaki Mori

Hiroyuki Nishii

Kouji Furuuchi

Yuri Horie

Junichi Moriyama

Hiroaki Mashiko

Naofumi Kosaka

Kyoko Ishii

Toshiki Yanagi

Toshimasa Nishimori

Ryota Masuda

Yuuta Shimazaki

Yuuki Sugou

Hiraoki Mashiko

The present invention provides a porous polytetrafluoroethylene membrane having a surface coated with a liquid-repellent agent. In this porous polytetrafluoroethylene membrane, the liquid-repellent agent is a polymer obtained by polymerization of monomers consisting essentially of CH&#x2550;CHCOOCHCHCF. This porous polytetrafluoroethylene membrane is suitable for use as a gas-permeable membrane that allows passage of gases but prevents entry of liquids and/or dust, specifically as a waterproof sound-transmitting membrane, a waterproof gas-permeable membrane, or a dustproof gas-permeable membrane.

Porous polytetrafluoroethylene membrane, method for producing the same, gas-permeable membrane and ventilation member using the same

A ventilation member is configured to be attached to an opening portion of a housing, and includes: an inner member configured to be fitted to the opening portion and including a tubular portion having a through hole configured to serve as a part of a ventilation path between a space inside the housing and a space outside the housing; and an outer member mounted to the inner member and covering a water-proof gas-permeable membrane attached so as to close an opening of the through hole. The inner member and the outer member have an exposed surface subjected to liquid-repellent treatment.

Ventilation member

A gas-permeable filter provided with oil repellency is provided. The gas-permeable filter includes a porous membrane having a surface coated with an oil-repellent agent. The oil-repellent agent includes a linear fluorine-containing hydrocarbon group represented by &#x2014;RCFCHCFor &#x2014;RCF, and the porous membrane is a stretched polytetrafluoroethylene (PTFE) porous membrane. Here, Rand Rare each independently an alkylene group having 1 to 12 carbon atoms or a phenylene group. The gas-permeable filter is provided with oil repellency without significant reduction in gas permeability.

Gas-permeable filter provided with oil repellency

Provided is an air-permeable sheet imparted with oil repellency, having a surface coated with an oil-repellent agent. The oil-repellent agent contains a linear fluorine-containing hydrocarbon group represented by &#x2014;RCFCHCFor &#x2014;RCF, where Rand Rare each independently an alkylene group having 1 to 12 carbon atoms or a phenylene group. The air-permeable sheet is a resin sheet having air permeability in a thickness direction of the resin sheet, the resin sheet is a non-porous sheet having two or more through holes formed to extend in the thickness direction, and the through holes are straight holes extending straight through the resin sheet. This air-permeable sheet is imparted with oil repellency without significantly reducing its air permeability.

Air-permeable sheet imparted with oil repellency

Disclosed is an air-permeable filter with an adhesive layer. This air-permeable filter is imparted with oil repellency and includes: a porous membrane having a surface coated with an oil-repellent agent; and an adhesive layer disposed on the surface. The oil-repellent agent contains a linear fluorine-containing hydrocarbon group represented by (1) &#x2014;RCFCHCFor (2) &#x2014;RCF, where Rand Rare each independently an alkylene group having 1 to 12 carbon atoms or a phenylene group. This air-permeable filter is imparted with oil repellency without significantly reducing its adhesive strength to the adhesive layer.

Oil repellency-imparted air-permeable filter with adhesive layer

Disclosed is an air-permeable film imparted with oil repellency, including a porous body having a surface coated with an oil-repellent agent. The oil-repellent agent contains a linear fluorine-containing hydrocarbon group represented by &#x2014;RCFCHCFor &#x2014;RCF, where Rand Rare each independently an alkylene group having 1 to 12 carbon atoms or a phenylene group, and the porous body is a porous formed body composed of ultra-high molecular weight polyethylene fine particles that are bound together. This air-permeable film is imparted with oil repellency without significantly reducing its air permeability.

Air-permeable film imparted with oil repellency

A vent member () includes a support body () provided with a through-hole (), a permeable membrane () closing the through-hole () in the support body (), and a cover part () covering the permeable membrane (). A ventilation hole () is made in a ceiling portion () of the cover part () and a notch () is made in a side wall portion () thereof. These ventilation hole () and notch () function as a passage for ventilation between the interior and the exterior of the cover part (). The ventilation hole () establishes a positional relation that it does not overlap a permeable region of the permeable membrane () in the axial direction. Further, the side wall portion () extends to the lower side in the axial direction below a position at which the permeable membrane () is disposed, and the permeable membrane () is protected entirely along a circumferential direction by the side wall portion (). The permeable membrane () is disposed on a mesa-like portion () that is convex to the upper side in the axial direction.

Vent member

A ventilation filter partincluding a support bodyand a ventilation filterfixed to the support bodyis disposed in a concave portionin a stationary die. A movable dieis brought into close proximity to the stationary dieand these dies are clamped together. Resin is injected into a cavity CV defined therebetween as a result of the clamping to make the injected resin and the ventilation filter partinto one piece. A housing upper portion(housing part) formed of the ventilation filter partand the injected resin is thus molded.

Method for manufacture of housing part provided with ventilation filter, and method for manufacture of housing provided with ventilation filter

A sound-permeable film () includes: a porous membrane () that contains polytetrafluoroethylene as its main component, allows sound to pass therethrough, and prevents an foreign object such as a water drop from passing therethrough; and a heat-resistant double-sided adhesive sheet () that is disposed on a part of at least one of main surfaces of the porous membrane ().

Sound-permeable film, electronic component with sound-permeable film, and method of producing circuit board having electronic component mounted thereon

A ventilation member having: a breathable film transmitting gas passing through an opening portion of a housing in a state in which the breathable film is fixed to the opening portion; and a support including a supporting portion for supporting the breathable film and an insertion portion to be inserted into the opening portion of the housing; wherein the insertion portion has a lock portion in an insertion-start-side end portion thereof, the lock portion having a tapered forward end, while the insertion portion is divided into a plurality of parts circumferentially at least on an insertion start side thereof.

Growing community of inventors

Osaka, Japan

Yoshiki Ikeyama