Apparel with body mapped waterproof-breathable portions
US-2020214368-A1 · Jul 9, 2020 · US
Porous polytetrafluoroethylene membrane, and waterproof air-permeable membrane and waterproof air-permeable member including the same
US11376554B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11376554-B2 |
| Application number | US-201716470920-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 18, 2017 |
| Priority date | Dec 19, 2016 |
| Publication date | Jul 5, 2022 |
| Grant date | Jul 5, 2022 |
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Abstract
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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.
First claim
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The invention claimed is: 1. A porous polytetrafluoroethylene 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. 2. The porous polytetrafluoroethylene membrane according to claim 1 , wherein the average node area ratio is 3% or less. 3. The porous polytetrafluoroethylene membrane according to claim 1 , having an average tortuosity of 1.5 or less in a thickness direction of the membrane. 4. The porous polytetrafluoroethylene membrane according to claim 1 , having a water entry pressure, as measured according to method B (high hydraulic pressure method) of water penetration test specified in JIS L 1092, of 10 kPa or more. 5. The porous polytetrafluoroethylene membrane according to claim 1 , having a porosity of 90% or more. 6. A waterproof air-permeable membrane comprising the porous polytetrafluoroethylene membrane according to claim 1 . 7. A waterproof air-permeable member comprising the waterproof air-permeable membrane according to claim 6 and a support joined to the waterproof air-permeable membrane.
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- What does patent US11376554B2 cover?
- 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…
- Who is the assignee on this patent?
- Nitto Denko Corp
- What technology area does this patent fall under?
- Primary CPC classification B01D71/36. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Jul 05 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).