Process for the manufacture of iso-imides or mixtures of iso-imi

Details Process for the manufacture of iso-imides or mixtures of iso-imi Process for the manufacture of iso-imides or mixtures of iso-imi

1978-05-22

1979-12-18

Daus, Donald G.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

26032626, 2603265FM, 2603433R, 2603436, C07D40310

Patent

active

041794443

ABSTRACT:
A process for the manufacture of iso-imides or mixtures of iso-imides and imides by reacting corresponding amide-acids with ketene at temperatures of about -10.degree. C. to +80.degree. C. is described. According to the process of the invention, the iso-imides or mixtures of iso-imides and imides can be manufactured in a simple, economical manner and in good to very good yields. The acetic anhydride formed during the reaction with the ketene can easily be recovered.

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Adrova et al., Polyimides a New Class of Heat-Resistant Polymers, p. 12 (1969).

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