Process for decreasing color in bis-imide flame retardants

Details Process for decreasing color in bis-imide flame retardants Process for decreasing color in bis-imide flame retardants

1991-05-07

1992-11-24

Lee, Mary C.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D20948

Patent

active

051663600

ABSTRACT:
The yellowness index of a flame retardant N,N'-alkylene-bis-(tetrahalophthalimide), such as N,N'-ethylene-bis-(tetrabromophthalimide), is reduced by treating the bis-imide with strong mineral acid.

REFERENCES:
patent: 3873567 (1975-03-01), Cyba
patent: 4087441 (1978-05-01), Lee
patent: 4092345 (1978-05-01), Wolford et al.
patent: 4535170 (1985-08-01), Sonnenberg
patent: 4873341 (1989-10-01), Anderson
patent: 4990626 (1991-02-01), Hutchinson et al.
ASTM D 1925, "Standard Test Method for Yellowness Index of Plastics", (1988).

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