| 摘要 |
PURPOSE:To reaction between 3,3',4,4'-benzophenone-tetracarboxylic acid and acetic anhydride is carried out in the presence of at least one of metal ion selected fro elements in group II and VIII of the periodic table to give a fine powder of the titled compound without any crushing process. CONSTITUTION:In the presence of at least one ion selected metal ions in the group II and group VIII in the periodic table such as cobalt acetate, magnesium hydroxide or anhydrous zinc chloride, the reaction of 3,3',4,4'- benzophenonetetracarboxylic acid with acetic anhydride is conducted to give 3,3',4,4'-benzophenonetetracarboxylic anhydride in the form of fine particles of 10-30mu sizes on the average. EFFECT:A starting material of polyimide resins or a curing agent for epoxy resins. |
