Acid anhydride complex and process for producing same, and composition containing same
AssigneesHitachi, Ltd., Hitachi Chemical Company, Ltd.
InventorsTakao Miwa, Takayoshi Ikeda, Shunichi Numata, Koji Fujisaki, Hisae Shimanoki
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Abstract
An acid dianhydride complex which is characterized in anti-hydrolysis, good stability, and high solubility in an organic solvent, is prepared by a reaction of a basic organic compound having a donor number of at least 20 and being free from an active hydrogen atom in the molecule and a carboxylic dianhydride compound.
Claims7
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.
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.
Dependencies are inferred from the claim text.