Processes for preparing carbon fibers using sulfur trioxide in a halogenated solvent
US9222201B2 · kind B2 · utility
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6References
18Claims
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Key dates
| Filing date | Jul 3, 2013 |
| Grant date | Dec 29, 2015 |
| Priority date | — |
| Expiry date | Jul 3, 2033 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06M2101/20
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Disclosed here are processes for preparing carbonized polymers (preferably carbon fibers), comprising sulfonating a polymer with a sulfonating agent that comprises SO3 dissolved in a solvent to form a sulfonated polymer; treating the sulfonated polymer with a heated solvent, wherein the temperature of the solvent is at least 95° C.; and carbonizing the resulting product by heating it to a temperature of 500-3000° C. Carbon fibers made according to these methods are also disclosed herein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.