Claims
- 1. A pitch-based carbon fiber made from a pitch having (1) a glass transition temperature width of at least 40.degree. C. as measured by a differential scanning calorimeter, (2) a proportion of the optically anisotropic phase of at least 10% and at most 70% by volume, and (3) a quinoline-insoluble content of at most 5% by weight, said carbon fiber having the following characteristics:
- Tensile Strength .gtoreq.329 kg/mm.sup.2
- Tensile Module .gtoreq.58 ton/mm.sup.2
- 0.degree. Compression Strength .gtoreq.58 kg/mm.sup.2.
- 2. The pitch-based carbon fiber according to claim 1, wherein the spinning raw material pitch is the one obtained by poly-condensing a condensed polycyclic hydrocarbon by means of a Lewis acid catalyst.
- 3. The pitch-based carbon fiber according to claim 1, wherein the temperature at which the spinning raw material pitch shows a shearing viscosity of 200 poise, is from 220.degree. to 370.degree. C.
Priority Claims (5)
Number |
Date |
Country |
Kind |
3-343660 |
Dec 1991 |
JPX |
|
3-357039 |
Dec 1991 |
JPX |
|
4-026927 |
Feb 1992 |
JPX |
|
4-059687 |
Feb 1992 |
JPX |
|
4-215018 |
Aug 1992 |
JPX |
|
Parent Case Info
This application is a Continuation of application Ser. No. 07/996,166, filed on Dec. 23, 1992, now abandoned.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
4017327 |
Lewis et al. |
Apr 1977 |
|
4775589 |
Hamada et al. |
Oct 1988 |
|
5120424 |
Cottinet et al. |
Jun 1992 |
|
5213677 |
Yamamoto et al. |
May 1993 |
|
Foreign Referenced Citations (4)
Number |
Date |
Country |
524667 |
Nov 1979 |
AUX |
0119100 |
Sep 1984 |
EPX |
0482560 |
Apr 1992 |
EPX |
2396793 |
Feb 1979 |
FRX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
996166 |
Dec 1992 |
|