Process for the manufacture of polyetherketoneketone fiber
US11326277B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 8, 2017 |
| Grant date | May 10, 2022 |
| Priority date | — |
| Expiry date | Jul 23, 2038 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD10B2331/061
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process for manufacturing a fiber including polyetherketoneketone including the steps of: mixing polyetherketoneketone and sulfuric acid having a concentration of at least 90 wt % to obtain a spin dope and passing the spin dope through a spinneret into a coagulation bath, wherein the polyetherketoneketone is dissolved in the sulfuric acid to a concentration of 12 to 22 wt %. Also disclosed are fibers obtainable by the process and polyetherketoneketone fibers having a sulfur content of 0.001 to 5 wt %, based on the weight of the fiber, in particular such fibers having low or high crystallinity, as well as, hybrid yarns and composite materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.