Method of producing carbon fibers from multipurpose commercial fibers
US10407802B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 2016 |
| Grant date | Sep 10, 2019 |
| Priority date | — |
| Expiry date | May 25, 2037 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F9/328
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method of producing carbon fibers includes the step of providing polyacrylonitrile precursor polymer fiber filaments. The polyacrylonitrile precursor filaments include from 87-97 mole % acrylonitrile, and less than 0.5 mole % of accelerant functional groups. The filaments are no more than 3 deniers per filament. The polyacrylonitrile precursor fiber filaments can be arranged into tows of at least 150,000 deniers per inch width. The arranged polyacrylonitrile precursor fiber tows are stabilized by heating the tows in at least one oxidation zone containing oxygen gas and maintained at a first temperature T1 while stretching the tows at least 10% to yield a stabilized precursor fiber tow. The stabilized precursor fiber tows are carbonized by passing the stabilized precursor fiber tows through a carbonization zone. Carbon fibers produced by the process are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.