Fabrication of high performance polybenzimidazole films
US4927909A · kind A · utility
19Cited by
8References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 18, 1987 |
| Grant date | May 22, 1990 |
| Priority date | — |
| Expiry date | Sep 18, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2379/04
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The instant invention involves a process for producing continuous polybenzimidazole films. The process is comprised of the following steps: PA0 (a) preparing a solvent solution of a polybenzimidazole polymer; PA0 (b) continuously casting the solution upon a support; PA0 (c) evaporating a sufficient amount of the solvent to form a self-supporting film in an oven; PA0 (d) washing the film in a nonsolvent; PA0 (e) removing the film from the support; and PA0 (f) continuously collecting the continuous film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.