Solutions of polyamideimides in .gamma.-butyrolactone, process for obtaining them and the yarns thus obtained
US5684119A · kind A · utility
5Cited by
1References
17Claims
0Family size
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Key dates
| Filing date | Jun 10, 1994 |
| Grant date | Nov 4, 1997 |
| Priority date | — |
| Expiry date | Jun 10, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2969
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Directly shapeable clear solutions of polyamide imides and a method for preparing same are provided. The solutions are obtained by polycondensation in .gamma.-butyrolactone (.gamma.BL) in substantially stoichiometric proportions between toluylene diisocyanate and an aromatic acid anhydride, and by dilution in (.gamma.BL) to give a solution allowing them to be processed at a later stage. Yarns and fibers made from said solutions are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.