Process for preparing a polyester-amide hollow fiber membrane
US4830796A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 9, 1987 |
| Grant date | May 16, 1989 |
| Priority date | — |
| Expiry date | Jun 9, 2007 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01D5/24
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A hollow fibre of polyester-amide, useful in the process of dialysis and in ultra-filtration processes in general, is formed by a polyester-amide with repetitive units (TATE).sub.n (wherein T is the terephthalic acid radical; A is the ethylenediamine radical; and E is the hexanediol radical). Such a fibre is obtained by a process which comprises the following steps, carried out sequentially: PA0 preparation of a solution of polyesteramide (TATE).sub.n in a solvent constituted by formic acid at a concentration higher than about 99%, or constituted by a solution of lithium chloride in dimethylformamide or dimethylacetamide; PA0 extrusion of said solution through a spinnerette having a cross section of annular shape and coagulation of the fibre in an aqueous coagulation bath, with the possible introduction of an aqueous coagulating liquid to the interior of the annular opening of the spinnerette; PA0 washing with water and recovery of the so-obtained hollow fibre.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.