Process for preparing a carbon fiber of high strength
US4925604A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 1985 |
| Grant date | May 15, 1990 |
| Priority date | — |
| Expiry date | Oct 15, 2005 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F9/22
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A carbon fiber of high strength is disclosed, each filament of which is substantially circular in its cross-section but which has circumferential ruggedness which extends in parallel to an axis of the filament to form pleats. The ruggedness has a depth of more than 0.1 .mu.m. The carbon fiber is prepared by extruding a spinning solution of an aqueous polyacrylonitrile/pure zinc chloride solution of a specified polymer content into a coagulating bath at a specified draft ratio, followed by washing, drying and stretching at a total stretching ratio of 10-20 folds to form a precursor which is then subjected to conventional stabilizing and carbonizing steps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.