Porous membranes for high pressure filtration
US-12064731-B2 · Aug 20, 2024 · US
Membrane made of a blend of UHMW polyolefins
US12166166B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12166166-B2 |
| Application number | US-202017034609-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 28, 2020 |
| Priority date | Mar 22, 2006 |
| Publication date | Dec 10, 2024 |
| Grant date | Dec 10, 2024 |
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- Title
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Abstract
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A membrane is a microporous sheet made of a blend of a first ultra high molecular weight polyolefin and a second ultra high molecular weight polyolefin. Each polyolefin has a molecular weight, both of those molecular weights are greater than 1 million, and one molecular weight is greater than the other. Additionally, the intrinsic viscosity (IV) of the membrane may be greater than or equal to 6.3.
First claim
Opening claim text (preview).
We claim: 1. A membrane comprising a microporous sheet comprising a first ultra high molecular weight polyethylene resin having a first molecular weight, a second ultra high molecular weight polyethylene resin having a second molecular weight, said first molecular weight and said second molecular weight being greater than 1 million and being different from one another, and a third polyolefin resin having a third molecular weight, said third molecular weight being less than 1 million, and wherein the membrane has an intrinsic viscosity greater than or equal to 6.3. 2. The membrane of claim 1 wherein said intrinsic viscosity of the membrane being greater than or equal to 7.7. 3. The membrane of claim 1 wherein said first molecular weight being 7<IV<15. 4. The membrane of claim 1 wherein said second molecular weight being IV>15. 5. The membrane of claim 1 wherein said third molecular weight being IV<7. 6. The membrane of claim 1 having characteristics selected from the group consisting of: a thickness of less than 5 mils (125 microns); a porosity between 25 and 85%; an average pore size between 0.01-0.5 microns; a puncture strength of greater than 300 gr-force/mil (25 microns); a MacMullin Number between 6-15; a Gurley Number of less than 60 sec/10 cc/mil; and combinations thereof. 7. The membrane of claim 1 being a battery separator. 8. The membrane of claim 1 being a battery separator for a lithium battery.
Assignees
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Classifications
Pore size · CPC title
Polyethylene · CPC title
Moulding; Embossing; Cutting · CPC title
Polyolefins · CPC title
Porosity · CPC title
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- What does patent US12166166B2 cover?
- A membrane is a microporous sheet made of a blend of a first ultra high molecular weight polyolefin and a second ultra high molecular weight polyolefin. Each polyolefin has a molecular weight, both of those molecular weights are greater than 1 million, and one molecular weight is greater than the other. Additionally, the intrinsic viscosity (IV) of the membrane may be greater than or equal to 6.3.
- Who is the assignee on this patent?
- Celgard Llc
- What technology area does this patent fall under?
- Primary CPC classification B01D67/002. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Dec 10 2024 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).