Preparation of imide oligomers via concurrent reactive extrusion
US9926408B2 · kind B2 · utility
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Key dates
| Filing date | Sep 24, 2014 |
| Grant date | Mar 27, 2018 |
| Priority date | — |
| Expiry date | Dec 29, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2379/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Reactive extrusion can be used in a continuous, solvent-less preparation of imide oligomers involving two competing reactions among three ingredients, the first reaction between a dianhydride and a diamine and the second reaction between an endcap and the same diamine. The imide oligomer can form a composite via conventional production methods or via formation of a film from imide oligomer re-melted in an extruder before being impregnated into tape or fabric.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.