Ultra white N,N'-ethylene-bis(tetrabromophthalimide) and its production in acetic acid
AssigneeGreat Lakes Chemical Corporation
InventorsBrian Tarbit, Brian Adger, Paul Willett
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Abstract
Disclosed is a process for producing an ultra-white N,N'-ethylene-bis(tetrabromophthalimide) product useful as a flame retardant. Also disclosed is a flame retardant composition predominantly comprised of N,N'-ethylene-bis(tetrabromophthalimide) and having a yellowness index of about 4 or less.
Claims28
A process for preparing a highly white N,N'-ethylene-bis(tetrabromophthalimide) product, comprising:
- reacting ethylene diamine and tetrabromophthalic anhydride in acetic acid to produce N,N'-ethylene-bis(tetrabromophthalimide);
- recovering the N,N'-ethylene-bis(tetrabromophthalimide) in a white precipitate;
- and
- drying the precipitate, so as to form a N,N'-ethylene-bis(tetrabromophthalimide) product with a yellowness index of about 4 or less.
A flame retardant composition predominantly comprised of N,N'-ethylene-bis(tetrabromophthalimide) and having a yellowness index of about 4 or less.
A process for preparing a highly white N,N'-ethylene-bis(tetrabromophthalimide) product, comprising:
- (a) slurrying tetrabromophthalic anhydride into acetic acid;
- (b) adding ethylene diamine to the slurry thus obtained to achieve essentially a 1:2 molar ratio of ethylene diamine to tetrabromophthalic anhydride, said adding occurring with the slurry at a temperature of at least about 80.degree. C.;
- (c) reacting the product of step (b) at a temperature of at least 120.degree. C.;
- and
- (d) drying the product of step (c);
- so as to form a white product at least 95% comprised of N,N'-ethylene-bis(tetrabromophthalimide).
Dependencies are inferred from the claim text.