Process for spinning from solution of polyamide-imides (PAI) based on tolylene or meta-phenylene diisocyanates and fibers thus obtained
US6258916A · kind A · utility
14Cited by
3References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 14, 1998 |
| Grant date | Jul 10, 2001 |
| Priority date | — |
| Expiry date | Jan 14, 2018 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F6/74
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a process for obtaining PAI fibers by spinning PAI in solution and to the fibers thus obtained. They are obtained by dry or wet spinning into dimethylalkyleneurea followed by removal of the solvent and overdrawing at high temperature. The yarns and fibers obtained are produced from PAI based on tolylene or meta-phenylene diisocyanate, and on an aromatic acid anhydride and/or an aromatic dianhydride, and optionally on one or a number of diacid compounds. They exhibit an outstanding thermomechanical behavior and make it possible to gain access to very low linear densities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.