Claims
- 1. Mesophase pitch for use in the production of carbon materials that has an average molecular weight of at least about 1,000 and the maximum molecular weight of up to about 15,000, that contains about 12 to 20 mole % of molecules having an average molecular weight of less than about 600, about 55 to 70 mole % of molecules having an average molecular weight of from about 600 to 1,500 and about 20 to 30 mole % of molecules having an average molecular weight of higher than about 1,500, that has a hydrogen-to-carbon atomic ratio of about 0.5 to 1.0 and an aromatic carbon ratio of at least about 0.7 with the methylic carbon content being at least about 4% of the total carbon atoms, and that has at least about 90% of an optically anisotropic phase.
- 2. Mesophase pitch according to claim 1 wherein the average molecular weight is in the range of from about 1,000-1,700.
- 3. Mesophase pitch according to claim 1 wherein the hydrogen-to-carbon atomic ratio is in the range of from about 0.6-1.0.
- 4. Mesophase pitch according to claim 1 wherein the aromatic carbon ratio is in the range of about 0.75-0.87.
- 5. Mesophase pitch according to claim 1 wherein the methylic carbon content is at least about 5% of the total carbon atoms.
- 6. Mesophase pitch according to claim 1 which has a softening point in the range of from 200.degree.-250.degree. C.
- 7. Mesophase pitch according to any one of the preceding claims which contains at least about 95% of an optically anisotropic phase.
- 8. Mesophase pitch according to claim 7 wherein the content of an optically anisotropic phase is substantially 100%.
Priority Claims (2)
Number |
Date |
Country |
Kind |
1-309482 |
Nov 1989 |
JPX |
|
2-272300 |
Oct 1990 |
JPX |
|
Parent Case Info
This application is continuation-in-part application of U.S. Ser. No. 618,893, filed on Nov. 28, 1990, now abandoned.
US Referenced Citations (5)
Number |
Name |
Date |
Kind |
4208267 |
Diefendorf et al. |
Jun 1980 |
|
4533461 |
Izumi et al. |
Aug 1985 |
|
4655902 |
Izumi et al. |
Apr 1987 |
|
4789455 |
Mochida et al. |
Dec 1988 |
|
4891126 |
Mochida et al. |
Jan 1990 |
|
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Number |
Date |
Country |
054437 |
Jun 1982 |
EPX |
318843 |
Jun 1982 |
EPX |
58-136835 |
Feb 1983 |
JPX |
58-18421 |
Aug 1983 |
JPX |
2164351 |
Mar 1986 |
GBX |
Non-Patent Literature Citations (2)
Entry |
European Search Report on the instant EP application. |
English translation of claims of references. |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
618893 |
Nov 1990 |
|