Process for preparing aromatic polyimide fibers
US5378420A · kind A · utility
6Cited by
3References
4Claims
0Family size
Assignee
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Key dates
| Filing date | Jun 16, 1993 |
| Grant date | Jan 3, 1995 |
| Priority date | — |
| Expiry date | Jun 16, 2013 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD02J1/22
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process for preparing polyimide fibers involves the preparation of a polymer in p-chlorophenol from reactants comprising 2,2'-dimethyl-4,4'-diaminobiphenyl and a tetracarboxylic anhydride. Following its preparation, the polyimide fibers can be spun directly from the reaction mixture. In a preferred embodiment, the dianhydride comprises 3,3',4,4'-biphenyltetracarboxylic dianhydride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.