Process for preparing bisimides and bisimides prepared thereby

Details Process for preparing bisimides and bisimides prepared thereby Process for preparing bisimides and bisimides prepared thereby

C - Chemistry, Metallurgy

07

D

260/306.1

C07D 209/48 (2006.01)

Patent

CA 1079286

PROCESS FOR PREPARING BISIMIDES AND BISIMIDES PREPARED THEREBY ABSTRACT OF THE DISCLOSURE White N, N' -alkylene-bis-tetrabromophthalimides are prepared by reacting about two molar proportions of tetrabromo- phthalic anhydride with about one molar proportion of a diamino- alkane containing 2-6 carbon atoms in a solvent mixture having a boiling point of at least about 125°C. and comprising about 50-97. 5% by weight of a liquid aromatic hydrocarbon or halohydrocarbon having a boiling point of at least about 80°C. and about 50-2.5% by weight of an alkanoic or aralkanoic acid having a dissociation constant not higher than about 6 x 10-5 at 25°C. A preferred solvent is a mixture of about 70% by weight of xylenes and about 30% by weight of propionic acid having a boiling point of about 130°C. The products are particularly useful as flame retardants.

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