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POLYIMIDES OF BENZOPHENONE TETRACARBOXYLIC ACID ESTERS AND AROMATIC DIAMINES HAVING A BASICITY CONSTANT OF LESS THAN 10-' AND METHOD OF PREPARATION
POLYIMIDES OF BENZOPHENONE TETRACARBOXYLIC ACID ESTERS AND AROMATIC DIAMINES HAVING A BASICITY CONSTANT OF LESS THAN 10-' AND METHOD OF PREPARATION