Process for the manufacture of maleimides

Details Process for the manufacture of maleimides Process for the manufacture of maleimides

1977-03-30

1978-12-19

Tovar, Jose

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

26032641, 2603265FM, 546281, 546308, 546309, C07D20700, C07D20702

Patent

active

041305647

ABSTRACT:
The invention relates to the improvement of the conventional processes for manufacturing monomaleimides and polymaleimides, in which it is known to cyclodehydrate corresponding monomaleamic or polymaleamic acids in the presence of acetic anhydride and tertiary amines. According to the invention, the tertiary amines are used only in very small amounts (0.1 to 0.5 mole per mole of maleamic acid group) and the dehydration is carried out at temperatures between 10.degree. and 50.degree. C. The end products are obtained in purer form and greater yield than in conventional processes.

REFERENCES:
patent: 3839358 (1974-10-01), Bargain
patent: 3868351 (1975-02-01), Hand et al.
patent: 3960887 (1976-06-01), Renard
patent: 3996203 (1976-12-01), Hand et al.

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