Method for making cellulose semipermeable hollow fibers
US4543221A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 1981 |
| Grant date | Sep 24, 1985 |
| Priority date | — |
| Expiry date | Oct 21, 2001 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01D5/24
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Improved cellulose semipermeable hollow fibers useful in detoxifying blood during hemodialysis or hemofiltration treatments. The cellulose fibers are fine, capillary fibers that are made by melt extrusion of certain cellulose ester polyol melt spin compositions into self-supporting gelled fibers. The cellulose ester gelled fibers are subsequently chemically converted into cellulose fibers by deacetylation, in aqueous alkali solution. The product fibers exhibit improved wet intrinsic tensile strength and higher water permeability characteristics than heretofore known cellulose fibers made from cellulose ester spin compositions. The invention includes the method of making the improved fibers and separatory cells such as hemodialyzers or hemofilters which contain the improved fibers in a gamma ray sterilized condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.