White bis-imide flame retardants

Details White bis-imide flame retardants White bis-imide flame retardants

1988-09-19

1989-10-10

Ceperley, Mary E.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D20948

Patent

active

048733415

ABSTRACT:
This invention relates to a method for preparing a white or at least near-white product which is predominant in alkylene(C.sub.1 -C.sub.5)-bis-(tetrabromophthalimide). This method comprises: forming a solution which contains, as a solvent, (i) SO.sub.3 or fuming sulfuric acid, and (ii) a haloalkane of the formula RX.sub.n, wherein R is an alkyl group containing up to two carbon atoms, X is a halogen selected independently from Br and Cl, and n is 2 or 3 when R is an alkyl containing 1 carbon atom and is 1, 2 or 3 when R is an alkyl group containing 2 carbon atoms, and, as a solute, the yellow alkylene(C.sub.1 -C.sub.5)-bis-tetrabromophthalimide predominant product obtained from the reaction of tetrabromophthalic anhydride and diaminoalkane is the presence of water and alkanoic acid; and adding water to said solution to precipitate therefrom the white or at least near-white product.

REFERENCES:
patent: 4092345 (1978-05-01), Wolford et al.
patent: 4125535 (1978-11-01), Wolford
patent: 4374220 (1983-02-01), Sonnenberg

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