Hollow fiber membranes and method of manufacture
US5762798A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 1993 |
| Grant date | Jun 9, 1998 |
| Priority date | — |
| Expiry date | May 6, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/755
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An asymmetrical, microporous, hollow fiber membrane is made from a polymeric dope mixture of polysulfone and polyvinyl pyrrolidone dissolved in an aprotic solvent. The physical morphology of the hollow fiber membrane, i.e., the asymmetric microporous wall, is rapidly formed by passing the polymeric dope mixture through an outer annular orifice of a tube-in-orifice spinneret while simultaneously passing a precipitating solution through the central tube of the spinneret. The emerging hollow fiber travels substantially downward for about 0.01-10 m before submersion into a quenching bath. The asymmetrical, microporous, hollow fiber membrane is biocompatible and suitable for use in, for example, dialysis, hemodialysis, ultrafiltration, and water filtration applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.