Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1992-08-11
1994-03-01
Lee, Mary C.
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
C07D40306
Patent
active
052909450
ABSTRACT:
This invention relates to a process for preparing a white bisimide product which principally contains N,N'-alkylene-bis(tetrabromophthalimide) or N,N'-bis(tetrabromophthalimide). The process features: providing, in a reaction vessel, a solution containing tetrabromophthalic anhydride and a solvent which contains at least about 15 weight percent of a mono-, di- or tri- carboxylic acid having a dissociation constant not higher than 1.0.times.10.sup.-3 at 25.degree. C.; forming a reaction mass by adding to the solution a diamine or a diamine salt formed by the partial or total diamine neutralization of a mono-, di- or tri- carboxylic acid having a dissociation constant not higher than 1.0.times.10.sup.-3 at 25.degree. C., such formation of the reaction mass resulting in the production of a bisimide precipitate which becomes a constituent of the reaction mass; during the formation of the reaction mass, (i) retaining, in the reaction mass, at least a portion of the water produced during such formation, (ii) maintaining a substantially constant pressure in the reaction vessel, and (iii) not allowing the temperature of the reaction mass to reach a temperature below about 135.degree. C.; terminating the addition of the diamine or diamine salt when the molar ratio of the tetrabromophthalic anhydride initially present in the solution to the diamine or diamine salt added is from about 1.9:1 to about 2.1:1; and recovering, as the bisimide product, the bisimide precipitate.
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Anderson Keith G.
Dadgar Ali M.
Hutchinson Donald O.
Roy Ranjit K.
Ethyl Corporation
Haley Jacqueline
Lee Mary C.
Spielman, Jr. Edgar E.
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