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| 2,3,6,7-Naphthalenetetracarboxylic Dianhydride (NTCDA) as a Monomer for Polyimide |
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| MORI Hiroaki NAKAO Hiroaki |
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| Abstract |
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| JFE Chemical has developed the thermal transformation of aromatic carboxylates to industrially produce 2,3,6,7-naphthalenetetracarboxylic acid (NTC) and NTCDA. The metal ion-catalyzed transformation was investigated on the influence of the anion moiety. The probable mechanism of the reaction is the formation of the metal salt of the carboxylic acid as an intermediate of the transformation. Further, the catalytic activity of the zinc compounds is examined in detail on the transformation of disodium naphthalenedicarboxylate. By optimizing ZnI2-catalyzed transformation NTC yield improved to about 25%, that is almost equal to that by the cadmium catalyst with high toxicity. Based on this result, a new process for NTCDA is developed. Polyimides derived from NTCDA are synthesized. Those polyimide films showed high modulus of elasticity, low thermal expansion coefficient and electrical reliability. They satisfy the required properties of printed circuits with high performance. |
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2,3,6,7-Naphthalenetetracarboxylic Dianhydride (NTCDA) as a Monomer for Polyimide  [
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