Preparation of asymmetric polyethylene hollow fiber membrane
US7364659B2 · kind B2 · utility
7Cited by
10References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 24, 2005 |
| Grant date | Apr 29, 2008 |
| Priority date | — |
| Expiry date | Jun 7, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2325/02834
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A porous polyethylene hollow fiber membrane having a pore-size gradient across the inner and outer surfaces thereof is prepared by introducing, during the cooling step of a melt-spun polyethylene hollow fiber, a nitrogen flow and a solvent having a boiling point in the range of 30 to 80° C. to the inner and outer surfaces of the melt-spun hollow fiber, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.