Porous polytetrafluoroethylene membrane, and waterproof air-permeable membrane and waterproof air-permeable member including the same
US11439958B2 · kind B2 · utility
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Key dates
| Filing date | Dec 18, 2017 |
| Grant date | Sep 13, 2022 |
| Priority date | — |
| Expiry date | Apr 2, 2039 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.