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US-12128366-B2 · Oct 29, 2024 · US
Porous hollow fiber membrane, method for producing same, and water purification method
US11338253B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11338253-B2 |
| Application number | US-202016933355-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 20, 2020 |
| Priority date | Jan 10, 2014 |
| Publication date | May 24, 2022 |
| Grant date | May 24, 2022 |
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- Title
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Abstract
Official abstract text for this publication.
The porous hollow fiber membrane of the present invention contains a thermoplastic resin, and includes a surface having a surface porosity of 32 to 60% and a fine pore diameter of 300 nm or less, and has a compressive strength of 0.7 MPa or more. The porous hollow fiber membrane of the present invention may include at least two layers, and in this case, the surface of one layer has a thickness of backbone of 0.3 to 20 μm and a fine pore diameter of 0.3 to 10 μm, and the surface of the other layer has a surface porosity of 32 to 60% and a fine pore diameter of 0.05 to 0.3 μm.
First claim
Opening claim text (preview).
What is claimed is: 1. A stretched porous hollow fiber membrane containing a polyvinylidene fluoride thermoplastic resin, comprising: a first layer; and a second layer, wherein the second layer, which is an outer layer, has a surface porosity of 32% or more and a pore diameter of 300 nm or less, the stretched membrane has a compressive strength of 0.7 MPa or more, and the first layer has a surface porosity of 25% to 35% and a pore diameter of 300 nm to 600 nm. 2. A stretched porous hollow fiber membrane according to claim 1 , wherein the first layer has a surface porosity of 25% to 32%. 3. A stretched porous hollow fiber membrane according to claim 1 , wherein the first layer has a surface porosity of 25% to 30%. 4. A stretched porous hollow fiber membrane according to claim 1 , wherein the first layer has a surface porosity of 30%. 5. A stretched porous hollow fiber membrane according to claim 1 , wherein the first layer has a surface porosity of about 30%. 6. A stretched porous hollow fiber membrane according to claim 1 , wherein the first layer has a pore diameter of 300 nm to 400 nm. 7. A stretched porous hollow fiber membrane according to claim 6 , wherein the first layer has a surface porosity of 25% to 32%. 8. A stretched porous hollow fiber membrane according to claim 6 , wherein the first layer has a surface porosity of 25% to 30%. 9. A stretched porous hollow fiber membrane according to claim 6 , wherein the first layer has a surface porosity of 30%. 10. A stretched porous hollow fiber membrane according to claim 6 , wherein the first layer has a surface porosity of about 30%.
Assignees
Inventors
Classifications
Dispersing a component, e.g. as particles or powder, in another component · CPC title
Three or more layers · CPC title
Pore size · CPC title
Co-extrusion; Co-spinning · CPC title
characterised by their properties · CPC title
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- What does patent US11338253B2 cover?
- The porous hollow fiber membrane of the present invention contains a thermoplastic resin, and includes a surface having a surface porosity of 32 to 60% and a fine pore diameter of 300 nm or less, and has a compressive strength of 0.7 MPa or more. The porous hollow fiber membrane of the present invention may include at least two layers, and in this case, the surface of one layer has a thickness …
- Who is the assignee on this patent?
- Asahi Chemical Ind
- What technology area does this patent fall under?
- Primary CPC classification B01D71/34. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue May 24 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).