Nitto-denko Corporation

Other

Nitto Shinko Corporation

Tomoyuki Kasagi

Youzou Yano

Kou Uemura

Daisuke Kitagawa

Teppei Tezuka

Shunji Imamura

Shimpei Yakuwa

Yusuke Nakayama

Tao Gu

Yuya Kitagawa

Satoshi Nishiyama

Akira Miyagaki

Kazuhiro Omura

Hiroichi Ukei

Takumi Takahashi

Mizuki Yamamoto

Yasuyuki Kihara

Akira Tamai

Syunji Imamura

A ventilation componentincludes a ventilation pathfor allowing ventilation between an inner spaceand an outer spaceof a housing. The ventilation pathis a path for allowing ventilation between the internal spaceand the outer spacewhen the ventilation componentis attached to an edge. The ventilation componentincludes a supporting portion, a gas-permeable membrane, a protruding portion, and a sealing member. The supporting portionsurrounds the ventilation path. The gas-permeable membraneis bonded to the supporting portionand closes the ventilation pathin a ventilatable manner. The protruding portionis a part having a tubular shape, the part being arranged to protrude from the supporting portionand surround one end of the ventilation path, the part being configured to be in contact with the edgewhen the ventilation componentis attached to the edge. The ventilation componentsatisfies a requirement 0.7≤D/W≤1.3.

Ventilation component

A ventilation assembly of the present disclosure includes: an internal member being a tubular body having an opening at a first end portion and an opening at a second end portion; a gas-permeable membrane covering the opening at the first end portion of the internal member; and an external member being a tubular body having a bottom, the external member being joined to the internal member with the internal member inserted in the interior of the external member from the first end portion side, wherein the ventilation assembly is to be fixed to the projection of the housing with the projection inserted in the opening at the second end portion of the internal member to make an inner peripheral surface of the internal member and an outer peripheral surface of the projection abut each other, the ventilation assembly has a second space serving as a ventilation path connecting the gas-permeable membrane and the outside of the ventilation assembly in at least one selected from the inside of the internal member, the inside of the external member, and an interspace between the internal member and the external member joined together, and a total length of a height of the internal member and a shortest length in the second space from an outer periphery of the internal member at the first end portion to an end portion of the ventilation path on the outside side is 6.0 mm or more and 20 mm or less. The ventilation assembly of the present disclosure is excellent in moisture permeation performance.

Ventilation assembly and ventilation housing

A ventilation housing of the present disclosure includes: a housing; and a ventilation assembly. The housing includes a tubular projection extending to project from an outer surface and internally having a first space communicating the inside and the outside of the housing. The ventilation assembly includes: an internal member being a tubular body having an opening at a first end portion and an opening at a second end portion; a gas-permeable membrane covering the opening at the first end portion of the internal member; and an external member being a tubular body having a bottom, the external member being joined to the internal member with the internal member inserted in the interior of the external member from the first end portion side. The ventilation assembly is fixed to the projection with the projection inserted in the opening at the second end portion of the internal member to make an inner peripheral surface of the internal member and an outer peripheral surface of the projection abut each other. The ventilation assembly has a second space serving as a ventilation path connecting the gas-permeable membrane and the outside of the ventilation assembly in the inside of the internal member, the inside of the external member, and/or an interspace between the two members. A ratio between an area Sof a cross-section of the first space and a smallest total area Sdetermined by comparison of values of different total areas determined at different distances from the gas-permeable membrane, the total areas each being determined for a cross-section(s) of the second space, is 1.0 or more. A ratio between the area Sand a total area Sof a plane consisting of a cross-section(s) of the second space taken at a position(s) where the second space is the narrowest is more than 1.0. This ventilation housing exhibits excellent performance in terms of moisture permeation between the inside and the outside of the housing.

Ventilation housing

A ventilation componentincludes a ventilation pathfor allowing ventilation between an inner spaceand an outer spaceof a housing. The ventilation pathis a path for allowing ventilation between the internal spaceand the outer spacewhen the ventilation componentis attached to an edge. The ventilation componentincludes a supporting portion, a gas-permeable membrane, a protruding portion, and a sealing member. The supporting portionsurrounds the ventilation path. The gas-permeable membraneis bonded to the supporting portionand closes the ventilation pathin a ventilatable manner. The protruding portionis a part having a tubular shape, the part being arranged to protrude from the supporting portionand surround one end of the ventilation path, the part being configured to be in contact with the edgewhen the ventilation componentis attached to the edge. The ventilation componentsatisfies requirements 2.5≤Gs/Gt≤5.0 and 1.0≤{(Gs−Gt)/2}/Lt≤3.0.

A ventilation assembly of the present disclosure includes: an internal member being a tubular body having an opening at a first end portion and an opening at a second end portion; an external member being a tubular body having a bottom; and a gas-permeable membrane covering the opening at the first end portion of the internal member, wherein the external member is joined to the internal member with the internal member inserted in the interior of the external member from the first end portion side, the ventilation assembly has a second space serving as a ventilation path connecting the gas-permeable membrane and the outside of the ventilation assembly in at least one selected from the inside of the internal member, the inside of the external member, and an interspace between the internal member and the external member joined together, and the internal member includes one first projecting portion or two or more first projecting portions projecting from the inner peripheral surface at a position on the second end portion side with respect to the gas-permeable membrane. The ventilation assembly of the present disclosure can prevent the gas-permeable membrane from being damaged at the time of fixation to the projection even when the ventilation assembly is reduced in height.

Provided is a composite material that shows a low specific dielectric constant, and that hardly causes an appearance failure or changes in characteristics when exposed to, for example, a treatment liquid to be used in the production of an electronic circuit board. Specifically, a plate-like composite material including polytetrafluoroethylene and a predetermined filler, and satisfying a predetermined condition serves as a composite material that shows a low specific dielectric constant, and that hardly causes an appearance failure or changes in characteristics even when exposed to, for example, a treatment liquid to be used in the production of an electronic circuit board.

Plate-like composite material containing polytetrafluoroethylene and filler

A ventilation component includes a valve body portion, a shaft portion, a ventilation path, and a gas-permeable membrane. The shaft portion extends in a normal direction of the valve body portion. The shaft portion supports the valve body portion. The ventilation path extends through the shaft portion. The gas-permeable membrane closes the ventilation path. In a state where the ventilation component is fixed to a housing, a flow of gas passing through a peripheral opening is blocked by the valve body portion, and ventilation occurs between an inner space and an external space via the gas-permeable membrane. When a pressure difference obtained by subtracting a pressure of the external space from a pressure of the inner space is equal to or higher than a predetermined value, the valve body portion elastically deforms to be away from an outer surface to release the pressure of the inner space.

Provided is an internal pressure adjustment member to be attached to an outer surface of a housing, the member having high air permeability even when a differential pressure that can be generated between the inside and the outside of a housing to which the internal pressure adjustment member is attached is small, and inhibiting damage to the member and a reduction in the air permeability of the member due to coming soil and mud. The internal pressure adjustment member includes: a filter portion including a net-like or mesh-like support layer and first and second porous polytetrafluoroethylene (PTFE) membranes laminated on the support layer such that the support layer is interposed therebetween, the first porous PTFE membrane being exposed on one surface of the filter portion, the second porous PTFE membrane being exposed on another surface of the filter portion; and an adhesive portion, formed on the one surface of the filter portion, for attaching the filter portion to the outer surface of the housing. The first porous PTFE membrane and the second porous PTFE membrane each have an average pore diameter of 2.0 &#x3bc;m or more, the filter portion has a thickness of 140 &#x3bc;m or less, and the filter portion has a density of 0.60 g/cmor less.

Infernal pressure adjustment member and electrical component for transport equipment

A ventilation housing of the present disclosure includes: a housing; and a ventilation assembly. The housing includes a tubular projection extending to project from an outer surface and internally having a first space communicating the inside and the outside of the housing. The ventilation assembly includes: an internal member being a tubular body having an opening at a first end portion and an opening at a second end portion; a gas-permeable membrane covering the opening at the first end portion of the internal member; and an external member being a tubular body having a bottom, the external member being joined to the internal member with the internal member inserted in the interior of the external member from the first end portion side. The ventilation assembly is fixed to the projection with the projection inserted in the opening at the second end portion of the internal member to make an inner peripheral surface of the internal member and an outer peripheral surface of the projection abut each other. The ventilation assembly has a second space serving as a ventilation path connecting the gas-permeable membrane and the outside of the ventilation assembly in the inside of the internal member, the inside of the external member, and/or an interspace between the internal member and the external member joined together. A height Hof the internal member is 6 to 10 mm. A ratio of the height Hof the internal member to a height Hof the projection is 1.00 to 1.70. The ventilation housing of the present disclosure exhibits excellent performance in terms of moisture permeation between the inside and the outside of the housing and is capable of reducing dropping of the ventilation assembly from the projection of the housing.

A plate-like composite material in which peeling of a conductor layer and the like serving as wiring is less liable to occur is provided. The plate-like composite material includes: a pore-containing layer, which contains a fluororesin and a filler, and which contains pores; and a resin layer containing a fluororesin bonded to one surface, or each of both surfaces, of the pore-containing layer, wherein the pore-containing layer includes, in a vicinity of an interface with the resin layer, a high resin content region, which contains the fluororesin in a content higher than a content in a remaining region of the pore-containing layer, and which contains the pores in a content lower than a content in the remaining region, and wherein the high resin content region has a thickness starting from the interface of from 0.20 &#x3bc;m to 10 &#x3bc;m.

Plate-like composite material

A porous polytetrafluoroethylene (PTFE) membrane of the present disclosure has a water vapor permeability, as measured according to Japanese Industrial Standard (JIS) L 1099 (method B-1), of 150000 g/(m&#xb7;day) or more in a thickness direction of the membrane. The porous PTFE membrane of the present disclosure, when attached as a waterproof air-permeable membrane to a housing of an electrical component or electrical device, allows water vapor residing inside the housing to be quickly discharged out of the housing.

Porous polytetrafluoroethylene membrane, and waterproof air-permeable membrane and waterproof air-permeable member including the same

A porous polytetrafluoroethylene (PTFE) membrane of the present disclosure is a membrane having an average fibril length of 50 &#x3bc;m or more, having an average node length 5 or more times larger than the average fibril length, and having an average node area ratio of 5% or less. The porous PTFE membrane of the present disclosure, when attached as a waterproof air-permeable membrane to a housing of an electrical component or electrical device, allows water vapor residing inside the housing to be quickly discharged out of the housing.

The present invention provides an electrically insulating resin composition comprising a polysulfone resin including a plurality of sulfonyl groups in the molecule and a polyamide resin, wherein the proportion of the polyamide resin is 1 to 45% by mass. The present invention also provides a laminate sheet obtained by bonding a plurality of sheet materials with a resin composition layer interposed therebetween, wherein the resin composition layer comprises a polysulfone resin including a plurality of sulfonyl groups in the molecule and a polyamide resin, and the proportion of the polyamide resin is 1 to 45% by mass.

Electrically insulating resin composition and laminate sheet

To obtain an insulating resin material serving as a material achieving both an excellent low specific dielectric constant and an excellent low linear thermal expansion coefficient, which has heretofore been difficult to obtain, and a metal layer-equipped insulating resin material and a wiring substrate each using the insulating resin material, provided is an insulating resin material, including: porous inorganic aggregates each having pores defined by a plurality of fine particles; and fibrils formed of polytetrafluoroethylene, wherein the fibrils are each multidirectionally oriented, wherein at least one of the porous inorganic aggregates and the fibrils are connected to each other, and wherein the insulating resin material is formed of a micro network structure having a porosity of 50% or more.

Growing community of inventors

Osaka, Japan

Tomoyuki Kasagi