Cellulose ester hollow fiber membrane for plasma separation
US4886631A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 2, 1988 |
| Grant date | Dec 12, 1989 |
| Priority date | — |
| Expiry date | Sep 2, 2008 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F2/28
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A hollow fiber membrane made of a cellulose ester having a membrane thickness of not more than 75 .mu.m, and having void volume (x, % by volume) of the membrane and a rate of ultrafiltration (y, ml/m.sup.2.hr.mmHg) satisfying the following formula: EQU 55x-2500.ltoreq.y.ltoreq.48x+600 PA0 wherein x.gtoreq.60, and further has a .beta.-lipoprotein sieving coefficient (sc) of not less than 0.95, and preferably having further not more than 2% of change ratio in the axial direction and in the radial direction when dipped freely in water at 121.degree. C. for 20 minutes. Said hollow fiber membrane is useful for the medical use, such as the exchange of plasma in patients, collection of plasma from healthy donors, the pre-treatment of plasma for the collection and purification of valuable materials contained in plasma.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.