Diphenyl oxide bromination process

Details Diphenyl oxide bromination process Diphenyl oxide bromination process

1991-09-25

1993-05-11

Cintins, Marianne M.

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

Organic compounds

Oxygen containing

568637, C07C 4122

Patent

active

052103218

ABSTRACT:
A process for producing a mixture of brominated diphenyl oxides with an average bromine number of 7.0 to 7.8 is improved by the utilization of a multi-step, multi-catalyst procedure. The process uses a zirconium catalyst in the first reaction and an iron catalyst in the second reaction to yield a whiter flame retardant product having less tendency to discolor plastic resins.

REFERENCES:
patent: 3763248 (1973-10-01), Mitchell
patent: 4717776 (1988-01-01), Brackenridge et al.
patent: 4740629 (1988-04-01), Brackenridge et al.

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