Polymer electrolyte membrane
US-2017012313-A1 · Jan 12, 2017 · US
Porous body, polymer electrolyte membrane, filter material for filter, and filter unit
US10688448B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10688448-B2 |
| Application number | US-201415100002-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 1, 2014 |
| Priority date | Nov 29, 2013 |
| Publication date | Jun 23, 2020 |
| Grant date | Jun 23, 2020 |
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- Title
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Abstract
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The present invention provides a porous body having high strength, a small pore size, and excellent homogeneity. The porous body of the present invention includes polytetrafluoroethylene and has a microstructure that includes nodes and fibrils. The microstructure further includes, in addition to the nodes and the fibrils, fused points where a fibril that links two nodes and another fibril that links another two nodes are fused with each other.
First claim
Opening claim text (preview).
The invention claimed is: 1. A porous body comprising polytetrafluoroethylene and having a microstructure that includes nodes and fibrils, the microstructure further including, in addition to the nodes and the fibrils, fused points where one fibril that links two nodes and another fibril that links another two nodes are fused with each other, wherein the one fibril and the another fibril fused with each other have a diameter difference of 10% or lower and a deviation from a straight line of within ±10° across the fused point, and wherein the fused points are formed by fusion of at least two 3-dimensionally crossing fibrils at their crossing point, wherein the polytetrafluoroethylene is obtained by copolymerizing tetrafluoroethylene and a trace comonomer. 2. The porous body according to claim 1 , wherein the microstructure includes five or more fused points within an area of 5 μm×5 μm observed in an electron microscopic image taken using a scanning electron microscope at a magnification of 10000×. 3. The porous body according to claim 1 , wherein the trace comonomer at least comprises perfluoro(methyl vinyl ether). 4. The porous body according to claim 3 , wherein the polytetrafluoroethylene comprises 0.011 mol % or more of a polymer unit derived from perfluoro(methyl vinyl ether) in all the monomer units. 5. The porous body according to claim 1 , which is a porous membrane. 6. The porous body according to claim 1 , which is obtained by biaxial stretching. 7. A filter material for filters, comprising the porous body according to claim 1 . 8. A filter unit comprising the filter material for filters according to claim 7 and a frame that holds the filter material for filters. 9. A polymer electrolyte membrane comprising the porous body according to claim 1 . 10. The porous body according to claim 1 , which is a porous hollow fiber. 11. The porous body according to claim 1 , which is a porous fiber.
Assignees
Inventors
Classifications
more than 0.1 and up to 1 µm · CPC title
Fibril, or microfibril structures · CPC title
Fuel cells · CPC title
Other shaped material, e.g. perforated or porous sheets · CPC title
Hollow fibre membranes (manufacture of hollow fibres D01D5/24, D01F1/08) · CPC title
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- What does patent US10688448B2 cover?
- The present invention provides a porous body having high strength, a small pore size, and excellent homogeneity. The porous body of the present invention includes polytetrafluoroethylene and has a microstructure that includes nodes and fibrils. The microstructure further includes, in addition to the nodes and the fibrils, fused points where a fibril that links two nodes and another fibril that …
- Who is the assignee on this patent?
- Daikin Ind Ltd
- 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 Jun 23 2020 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 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).