| 摘要 |
Pitch is prepared by mixing a tar, which can be a coal or petroleum derived tar with a nitrating agent selected from nitric acid, an organic nitrate and nitrogen pentoxide and heating the resulting mixture to and at a temperature of 150 to 400 DEG C. By this process a pitch is obtained in high yield and which upon carbonization provides carbon materials, such as fibers or filaments, having a good balance of physical properties. |
