PRODUCTION OF ALPHA-ANILINONITRONE DERIVATIVE AND POLYESTER WITH LOW CONTENT OF TERMINAL CARBOXYL GROUP

摘要

PROBLEM TO BE SOLVED: To produce an α-anilinonitrone derivative effective in reducing terminal carboxyl groups in a polyester, excellent in hydrolytic resistance and useful for papermaking canvases, tire cords, fabrics, etc., for medical use. ;SOLUTION: This anilinonitrone derivative is represented by formula I (R², R¹², R³, R¹³, R⁴ and R⁵ are each a 1-7C alkyl; R⁶, R¹⁶, R⁷, R⁸, R¹⁸, R⁹, R¹⁹, R¹⁰, and R¹¹ are each a 1-16C alkyl or H), e.g. α-3,5-di-t-butylanilino-N-3,5-di-t- dutylphenylnitrone. The derivative represented by formula I is obtained as a by-product of carbodiimide by reacting an alkyl-substituted phenyl isocyanate in an aromatic hydrocarbon solvent in the presence of a phosphorus catalyst for synthesizing the carbodiimide. A polyester with a low content of terminal carboxyl groups is prepared by bringing at least one α-anilinonitrone derivative selected from compounds represented by formulas I and II into contact with the polyester containing the terminal carboxyl group.;COPYRIGHT: (C)1997,JPO