Loading patent…
AssigneeNitto Denko Corporation
InventorsTeppei Tezuka, Youzou Yano, Kazuhiro Omura, Tomoyuki Kasagi
Estimating the term…
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/(m2·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.
A porous polytetrafluoroethylene membrane having a water vapor permeability, as measured according to JIS L 1099 (method B-1), of 150000 g/(m2·day) or more in a thickness direction of the membrane, and having an average tortuosity of 1.5 or less in the thickness direction of the membrane, having an average fibril length of 50 μm 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.
Dependencies are inferred from the claim text.