Highly anisotropic membranes
US4333972A · kind A · utility
14Cited by
3References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 25, 1980 |
| Grant date | Jun 8, 1982 |
| Priority date | — |
| Expiry date | Jun 25, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2325/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The discovery that highly anisotropic membranes, e.g. with a degree of anisotropy of five can for the very first time be produced by the dry phase inversion process by a very specific combination of polymers, solvent and non-solvent, optionally along with plasticizers and modifiers, all of which separately are known in membrane technology, the polymers consisting essentially of cellulose nitrate and cellulose nitrate-cellulose acetate mixed ester polymers, the solvent being methyl formate, propylene oxide, or mixtures thereof, and the non-solvents being isopropyl alcohol, t-butyl alcohol or mixtures thereof, is disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.