Air-permeable sheet imparted with oil repellency
US-2015166820-A1 · Jun 18, 2015 · US
Gas-permeable filter provided with oil repellency
US9508971B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9508971-B2 |
| Application number | US-201214001813-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 24, 2012 |
| Priority date | Feb 28, 2011 |
| Publication date | Nov 29, 2016 |
| Grant date | Nov 29, 2016 |
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- Title
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Abstract
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A gas-permeable filter provided with oil repellency is provided. The gas-permeable filter includes a porous membrane having a surface coated with an oil-repellent agent. The oil-repellent agent includes a linear fluorine-containing hydrocarbon group represented by —R 1 C 5 F 10 CH 2 C 4 F 9 or —R 2 C 6 F 13 , and the porous membrane is a stretched polytetrafluoroethylene (PTFE) porous membrane. Here, R 1 and R 2 are each independently an alkylene group having 1 to 12 carbon atoms or a phenylene group. The gas-permeable filter is provided with oil repellency without significant reduction in gas permeability.
First claim
Opening claim text (preview).
The invention claimed is: 1. A gas-permeable filter provided with oil repellency, the gas-permeable filter comprising a porous membrane having a surface coated with an oil-repellent agent, wherein the porous membrane is a stretched polytetrafluoroethylene porous membrane, and the oil-repellent agent comprises a linear fluorine-containing hydrocarbon group represented by —R 1 C 5 F 10 CH 2 C 4 F 9 , where R 1 is an alkylene group having from 1 to 12 carbon atoms or a phenylene group. 2. The gas-permeable filter according to claim 1 , wherein the gas-permeable filter has a gas permeability of 35 seconds/100 ml or lower in terms of Gurley number, and a 5 mm-diameter droplet of an organic solvent that is n-decane or methanol does not penetrate the surface within 30 seconds after the droplet is applied onto the surface. 3. The gas-permeable filter according to claim 2 , wherein the stretched polytetrafluoroethylene porous membrane has a thickness of 5 μm or more. 4. The gas-permeable filter according to claim 1 , wherein the oil-repellent agent is a polymer formed from monomers at least part of which is a compound represented by: CH 2 ═CR 3 COOR 1 C 5 F 10 CH 2 C 4 F 9 , where R 3 is a hydrogen atom or a methyl group. 5. The gas-permeable filter according to claim 4 , wherein the oil-repellent agent is a polymer formed from a monomer that consists of the compound represented by: CH 2 ═CR 3 COOR 1 C 5 F 10 CH 2 C 4 F 9 . 6. The gas-permeable filter according to claim 5 , wherein a 5 mm-diameter droplet of an organic solvent that is n-hexane does not penetrate the surface within 30 seconds after the droplet is applied onto the surface.
Assignees
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Classifications
with only one layer of a composition containing a polymer binder (with more layers C08J7/042) · CPC title
Physical treatment with compounds, e.g. swelling, coating or impregnation · CPC title
on a layer of the filter · CPC title
characterised by their properties · CPC title
Specific permeability or cut-off range · CPC title
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- What does patent US9508971B2 cover?
- A gas-permeable filter provided with oil repellency is provided. The gas-permeable filter includes a porous membrane having a surface coated with an oil-repellent agent. The oil-repellent agent includes a linear fluorine-containing hydrocarbon group represented by —R 1 C 5 F 10 CH 2 C 4 F 9 or —R 2 C 6 F 13 , and the porous membrane is a stretched polytetrafluoroethylene (PTFE) porous membrane…
- Who is the assignee on this patent?
- Ikeyama Yoshiki, Maruoka Nobuaki, Kosaka Naofumi, and 2 more
- 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 Nov 29 2016 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 7 related publications on this page (citations in our corpus or others sharing the same primary CPC).