Hollow fibres
US4056467A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 3, 1975 |
| Grant date | Nov 1, 1977 |
| Priority date | — |
| Expiry date | Jun 3, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2975
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A hollow fiber is provided possessing a continuous longitudinally extending channel free from macromolecular material, said fiber consisting essentially of a copolymer of acrylonitrile and an olefinically unsaturated comonomer containing an optionally salified sulphonic acid group, and possessing micropores of average diameter less than about 100 A, between 40% and 80% of walls of the fiber being empty space. This fiber can be prepared by injecting a solution of a copolymer of acrylonitrile and an olefinically unsaturated comonomer containing an optionally salified sulphonic acid group in at least one polar organic solvent into a spinneret with an annular orifice, and immediately coagulating the inside and the outside of the nascent hollow fibre issuing from the spinneret with a coagulating fluid which is selected from: PA1 A. a less than saturated aqueous solution of an inorganic salt, said solution optionally containing up to 40% of a miscible polar organic solvent, and PA1 B. at least one polar organic solvent which is a non-solvent for the acrylonitrile copolymer and is miscible with the solvent for the copolymer, the coagulation inside the fiber being carried out by injecting …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.