Two-step sulfonation process for the conversion of polymer fibers to carbon fibers
US9816207B2 · kind B2 · utility
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19Claims
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Key dates
| Filing date | Jul 3, 2013 |
| Grant date | Nov 14, 2017 |
| 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 herein are processes for preparing carbon fibers, comprising: sulfonating a polymer fiber with a sulfonating agent that is fuming sulfuric acid, sulfuric acid, chlorosulfonic acid, or a combination thereof; treating the sulfonated polymer with a heated solvent, wherein the temperature of the heated solvent is at least 95° C.; and carbonizing the resulting product by heating it to a temperature of 501-3000° C. Carbon fibers prepared according to these methods are also disclosed herein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.