Process for producing pitch based activated carbon fibers and carbon fibers
US5356574A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 1993 |
| Grant date | Oct 18, 1994 |
| Priority date | — |
| Expiry date | Sep 10, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10C3/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for providing activated carbon fibers consisting of optically anisotropic components and optically isotropic components by spinning a pitch into fibers, and infusibilizing the resulting fibers, followed by an activation treatment. The pitch for spinning is prepared by melt mixing together (A) 100 parts by weight of an optically isotropic pitch having a softening point of 230.degree.-300.degree. C. obtained by heat treatment of a pitch while blowing an oxygen containing gas into the pitch, and (B) 10-50 parts by weight of an optically isotropic pitch having a softening point of 200.degree.-270.degree. C. obtained by polymerization of naphthalene in the presence of a Lewis acid catalyst. The optically isotropic pitch (B) is further characterized as having the property of being converted into an optically anisotropic pitch by the stress occurring at the time of spinning. The carbon fibers produced by spinning the spinning pitch into fibers have a double layer structure, the surface layer exhibiting optical isotropy and the center portion exhibiting optical anisotropy. The spun fibers are infusibilized, followed by carbonization and/or graphitization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.