Processes for preparing carbon fibers using gaseous sulfur trioxide
US9228276B2 · kind B2 · utility
4Cited by
3References
18Claims
0Family size
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Key dates
| Filing date | Jul 3, 2013 |
| Grant date | Jan 5, 2016 |
| Priority date | — |
| Expiry date | Jul 3, 2033 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F9/20
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Disclosed herein are processes for preparing carbonized polymers, such as carbon fibers, comprising: sulfonating a polymer with a sulfonating agent that comprises SO3 gas to form a sulfonated polymer; treating the sulfonated polymer with a heated solvent, wherein the temperature of said solvent is at least 95° C.; and carbonizing the resulting product by heating it to a temperature of 500-3000° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.