Polyimide membrane having improved flux
US4897092A · kind A · utility
36Cited by
14References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1989 |
| Grant date | Jan 30, 1990 |
| Priority date | — |
| Expiry date | Feb 27, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D71/64
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention is a class of polyimide membranes wherein the diamine portion of the polymer structure is an alkylated bisaniline. The bridging group of the diamine possesses restricted, rotatable rigid, or low Van Der Waal energy substituents which are orthogonal to the polymer backbone. These polyamide membranes exhibit enhanced gas flux and are useful in various gas separation applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.