Process for producing pitch-based carbon fibers superior in compression characteristics
US5470558A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 1994 |
| Grant date | Nov 28, 1995 |
| Priority date | — |
| Expiry date | May 13, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10C3/026
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Pitch-based carbon fibers superior in compression characteristics are obtained by mixing a polycyclic aromatic compound and a hydrogen donating compound at a mole ratio of the latter to the former in the range of 0.1 to 10, polymerizing the resulting mixture at a temperature of 50.degree. to 400.degree. C. in the presence of a Lewis acid as catalyst, then removing the catalyst, thereafter heat-treating the resulting polymer to obtain a pitch containing 5-40% of anisotropic spheres of 5-60 .mu.m, having a total amount of aliphatic hydrogen of 25-50% and an amount of aliphatic hydrogen after .beta. of 5-25% and containing not more than 30% of oriented carbon based on a total amount of aromatic carbon, then spinning said pitch, then making the resulting pitch fiber infusible and subjecting the pitch fiber thus rendered infusible to a carbonization treatment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.