Porous polytetrafluoroethylene membrane, and waterproof air-permeable membrane and waterproof air-permeable member including the same
US11376554B2 · kind B2 · utility
0Cited by
19References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2017 |
| Grant date | Jul 5, 2022 |
| Priority date | — |
| Expiry date | Mar 23, 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 is a 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. 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.