Selectively permeable hollow fiber membrane and process for producing same
US6013182A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 1997 |
| Grant date | Jan 11, 2000 |
| Priority date | — |
| Expiry date | Apr 18, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D69/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A selectively permeable hollow fiber membrane for blood dialysis consisting substantially of a cellulose derivative, which has at least a dense layer on the innermost side and a porous layer of greater void percentage on the outside, and a process for producing the selectively permeable hollow fiber membrane consisting substantially of a cellulose derivative, which comprises extruding a spinning solution containing a polymer consisting substantially of a cellulose derivative dissolved in an organic solvent, from an annular slit into a filamentous form, while simultaneously introducing a core material solution with a water content of at least 50 wt % into the extruded filamentous body, and then immersing the filamentous body into a coagulating solution after passing it through a gas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.