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

1977-02-07

1978-11-14

Love, Ethel G.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D20934

Patent

active

041255356

ABSTRACT:
White N,N'-alkylene-bis-tetrabromophthalimides are prepared by reacting about two molar proportions of tetrabromophthalic anhydride with about one molar proportion of a diaminoalkane containing 2-6 carbon atoms in a solvent mixture having a boiling point of at least about 125.degree. 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.degree. C. and about 50-2.5% by weight of an alkanoic or aralkanoic acid having a dissociation constant not higher than about 6 .times. 10.sup.-5 at 25.degree. 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.degree. C. The products are particularly useful as flame retardants.

REFERENCES:
patent: 3051724 (1962-08-01), Bolton et al.
patent: 3873567 (1975-03-01), Cyba

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