Claims
- 1. A complex consisting essentially of an aromatic acid dianhydride and an organic base substance coordinated with the dianhydride, said base substance having a donor number of at least 20 and being free from an active hydrogen atom therein, wherein the complex has an endothermic peak of 102.degree. to 257.degree. C.
- 2. The complex as claimed in claim 1, wherein said base substance has the donor number of at least 25.
- 3. A complex according to claim 1, wherein said complex is represented by the following general formula: ##STR3## wherein Ar" is a residual group of a carboxylic dianhydride and B is the organic base substance coordinated with the dianhydride.
- 4. A complex according to claim 1, wherein said complex is represented by the general formula: ##STR4## wherein Ar" is a residual group of a carboxylic dianhydride, R is an organic residue group of an amine and n is 0 or an integer of at most 20 and B is the organic base substance coordinated with the dianhydride.
- 5. A process for preparing a composition comprising a complex consisting essentially of an aromatic acid dianhydride and an organic base substance coordinated with the dianhydride, which comprises contacting an aromatic acid dianhydride with a base substance having a donor number of at least 20 and being free from an active hydrogen atom therein, at an elevated temperature for a time sufficient to form the complex, wherein the complex has an endothermic peak of 102.degree. to 257.degree. C.
- 6. A process according to claim 5, which comprises contacting a carboxylic dianhydride Ar with a base substance B having a donor of at least 20 and being free from an active hydrogen atom in the molecule in such a manner that the dianhydride Ar and the compound B are broader to contact in the gaseous state, thereby forming a complex represented by the general formula:
- Ar.aB (wherein 2.gtoreq.a>1)
- said complex having a coordinate bond between the carbon atom and the carbonyl group of the carboxylic dianhydride and said base substance B.
- 7. The process according to claim 5, wherein said carboxylic dianhydride is contacted with said base substance in the vapor phase.
Priority Claims (1)
Number |
Date |
Country |
Kind |
1-224445 |
Sep 1989 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 567,160, filed Aug. 14, 1990, which is now pending.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4271079 |
Maeda et al. |
Jun 1981 |
|
Non-Patent Literature Citations (1)
Entry |
G. M. Bower and L. W. Frost, "Aromatic Polyimides", Journal of Polymer Science: Part A, 1, 3135-3150 (1963). |
Continuations (1)
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Number |
Date |
Country |
Parent |
567160 |
Aug 1990 |
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