Microlayer membranes, improved battery separators, and methods of manufacture and use
US-2018323417-A1 · Nov 8, 2018 · US
Method for synthesis of flexible multifunctional high-voidage ultrathin PE membranes
US11389772B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11389772-B2 |
| Application number | US-201816642316-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 18, 2018 |
| Priority date | Dec 18, 2017 |
| Publication date | Jul 19, 2022 |
| Grant date | Jul 19, 2022 |
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- Title
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Abstract
Official abstract text for this publication.
Disclosed are a method of manufacturing a polyethylene membrane comprising: stretching a polyethylene film in a first direction during a first stretching; attaching a plurality of rods on side edges of the polyethylene film; attaching a tape on the polyethylene film; stretching the polyethylene film having the rods attached thereto in a second direction during a second stretching; and annealing the polyethylene film after the second stretching. The second direction can be a transverse direction of the first direction, and the first stretching and the second stretching can be performed at the same (or higher) temperature and the same stretching speed as each other.
First claim
Opening claim text (preview).
What is claimed is: 1. A polyethylene membrane, comprising: a plurality of biaxially oriented polymer chains, wherein a thickness of the polyethylene membrane is 100 nanometers (nm) or less, wherein the polyethylene membrane comprises a plurality of pores with a pore diameter in a range of 5 nm to 100 nm, wherein the polyethylene membrane is a free-standing film, and wherein the polyethylene membrane has an ultimate tensile stress of at least 300 mega-Pascal (MPa). 2. The polyethylene membrane according to claim 1 , wherein orientations of the polymer chains are isotropic in a two-dimensional plane perpendicular to a direction of the thickness of the polyethylene membrane. 3. The polyethylene membrane according to claim 1 , wherein orientations of the polymer chains in a two-dimensional plane are perpendicular to a direction of the thickness of the polyethylene membrane. 4. The polyethylene membrane according to claim 1 , wherein the polyethylene membrane has a Young's Modulus of at least 500 MPa. 5. The polyethylene membrane according to claim 1 , wherein the polyethylene membrane has a UV-vis transmission of at least 50% with respect to 200 nm wavelength light and at least 95% with respect to 1100 nm wavelength light.
Assignees
Inventors
Classifications
Membranes, diaphragms · CPC title
Thermal after-treatment · CPC title
successively · CPC title
Details of membrane preparation apparatus · CPC title
bi-axially · CPC title
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Frequently asked questions
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- What does patent US11389772B2 cover?
- Disclosed are a method of manufacturing a polyethylene membrane comprising: stretching a polyethylene film in a first direction during a first stretching; attaching a plurality of rods on side edges of the polyethylene film; attaching a tape on the polyethylene film; stretching the polyethylene film having the rods attached thereto in a second direction during a second stretching; and annealing…
- Who is the assignee on this patent?
- Univ Hong Kong Science & Tech
- What technology area does this patent fall under?
- Primary CPC classification B01D67/0027. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Jul 19 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 9 related publications on this page (citations in our corpus or others sharing the same primary CPC).