Spacers for ion-exchange device
US-2024307797-A1 · Sep 19, 2024 · US
Filter element with improved testability after dry steaming
US11020689B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11020689-B2 |
| Application number | US-201314388846-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 16, 2013 |
| Priority date | Apr 27, 2012 |
| Publication date | Jun 1, 2021 |
| Grant date | Jun 1, 2021 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
The present invention relates to a melt-joined filter element with improved testability after dry steaming or alternatively after sterilization by irradiation, to a method for producing the filter element according to the invention, and to the use of the filter element for filtering solutions.
First claim
Opening claim text (preview).
The invention claimed is: 1. A melt-joined filter element with improved testability after dry steaming or after sterilization by irradiation, the filter element comprising a porous, permanently hydrophilized polymer membrane that has been permanently hydrophilized by a hydrophilizing agent so that a surface tension of the membrane at 20° C. is greater than 72 mN/m, the hydrophilizing agent having a specified degradation temperature; and a housing formed from polypropylene having a melting point that is at least 125° C. lower than the degradation temperature of the hydrophilizing agent with which the polymer membrane is permanently hydrophilized, wherein the polymer membrane is bonded to the housing by melt joining by a melt joining process without a degradation of the hydrophilizing agent in a melt joining region to the housing due to the difference between the melting point of the polypropylene of the housing and the degradation temperature of the hydrophilizing agent, and wherein strips of plastics film are not introduced in the melt joining region, and wherein the hydrophilizing agent is poly-2-ethyloxazoline and the polymer membrane comprises polyethersulfone. 2. The filter element of claim 1 , wherein the permanent hydrophilization of the polymer membrane is effected by chemical or physical modification of an unmodified polymer membrane with the hydrophilizing agent. 3. The filter element of claim 2 , wherein the melting point of the polypropylene is at least 140° C. lower than the degradation temperature of the hydrophilizing agent. 4. The filter element of claim 2 , wherein the hydrophilizing agent has a degradation temperature of at least 270° C.
Assignees
Inventors
Classifications
- B01D65/003Primary
Membrane bonding or sealing · CPC title
Chemical modification · CPC title
Membrane sterilisation · CPC title
Hydrophilic membranes · CPC title
with wave-energy, particle-radiation or plasma · CPC title
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Frequently asked questions
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- What does patent US11020689B2 cover?
- The present invention relates to a melt-joined filter element with improved testability after dry steaming or alternatively after sterilization by irradiation, to a method for producing the filter element according to the invention, and to the use of the filter element for filtering solutions.
- Who is the assignee on this patent?
- Sartorius Stedim Biotech Gmbh
- What technology area does this patent fall under?
- Primary CPC classification B01D65/003. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Jun 01 2021 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).