Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1990-03-05
1991-02-12
Wax, Robert A.
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
C07D20948
Patent
active
049925571
ABSTRACT:
In a first embodiment this invention relates to a process for preparing a white product which principally contains a bisimide. The process comprises: providing tetrabromophthalic anhydride and a solvent in a reaction vessel; forming, at a temperature within the range of from about 140.degree. C. to about 200.degree. C., a reaction mass by adding a diamine, a diamine salt or a mixture thereof to the solution, the formation of the reaction mass resulting in the production of a bisimide precipitate which becomes a component of the reaction mass; terminating the addition of the diamine when the molar ratio of the tetrabromophthalic anhydride initially present in the solution to the diamine or diamine salt added is substantially stoichiometric; cooking the bisimide precipitate to increase the average sphericity of the particles making up the bisimide precipitate; and recovering from the reaction mass, as the bisimide product, the cooked precipitate. In a second embodiment the cooking step is optional and the retention of water formed during the diamine or diamine salt addition is featured.
REFERENCES:
patent: 3868388 (1975-02-01), Dotson
patent: 3966726 (1976-06-01), Toth
patent: 4092345 (1978-05-01), Wolford
patent: 4125535 (1978-11-01), Wolford
patent: 4374220 (1983-02-01), Sonnenberg
patent: 4535170 (1985-08-01), Sonnenberg
patent: 4581396 (1986-04-01), Sonnenberg
Anderson Keith G.
Dadgar Ali M.
Hutchinson Donald O.
Ethyl Corporation
LaRose David E.
Spielman, Jr. E. E.
Tsung F.
Wax Robert A.
LandOfFree
Process for preparing bisimide products does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for preparing bisimide products, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for preparing bisimide products will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-21551