Method of making carbon fibers from lignin
US9683313B2 · kind B2 · utility
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19Claims
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Key dates
| Filing date | Aug 20, 2013 |
| Grant date | Jun 20, 2017 |
| Priority date | — |
| Expiry date | Nov 29, 2033 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01D5/06
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method of making a carbon fiber includes heat treating a lignin precursor absent an active ingredient in an inert atmosphere to raise the glass transition temperature (Tg) of the precursor by at least five (5%) percent, forming a lignin precursor having an increased Tg (High Tg Lignin). The High Tg Lignin can be spun into a fiber. The fiber may then be stabilized to form a thermoset fiber. The time period for stabilizing the fiber is less than one hundred (100) hours.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.