Fabrication of benzbisazole polymers into monolithic articles
US5326509A · kind A · utility
2Cited by
10References
5Claims
0Family size
Assignee
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Key dates
| Filing date | Oct 7, 1993 |
| Grant date | Jul 5, 1994 |
| Priority date | — |
| Expiry date | Oct 7, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2379/04
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for fabricating a monolithic polybenzbisazole article including the steps of: PA1 (a) dissolving at least one benzbisazole polymer in a strong acid at an elevated temperature; PA1 (b) transferring the resulting solution to a mold; PA1 (c) cooling the solution in the mold to a temperature below the gelation temperature of the acid-polymer mixture, thus providing a polymer-acid gel; PA1 (d) ageing the gel for about 0.25 to 10 days; PA1 (e) replacing the acid in the gel with water; PA1 (f) replacing the water in the gel with a lower aliphatic alcohol; and PA1 (g) densifying the gel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.