Membranes formed from unsaturated polyimides
US4952220A · kind A · utility
40Cited by
10References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1989 |
| Grant date | Aug 28, 1990 |
| Priority date | — |
| Expiry date | Oct 11, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2323/30
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention is a class of polyimide membranes containing copolymerizable, surface modifiable units containing both aromatic diamines and alkenylated diamines having an allyl or allylaryl group preferably positoned ortho to an amine functionality. The polyimide membranes can be surface modified by treatment with an activating force such as high energy electromagnetic irradiation or with a free radical source to impart high selectivity to the membrane without causing a large decrease in composite permeance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.