TETRABROMOPHTHALIC DIESTER FLAME RETARDANTS AND THEIR PRODUCTION

摘要

In a process for producing a tetrabromophthalic diester composition, a liquid reaction mixture is prepared comprising tetrabromophthalic anhydride (TBPA), a C2 to C6 polyhydric aliphatic alcohol (PAA) and an alkylene oxide (AO) selected from the group consisting of ethylene oxide and propylene oxide, said reaction mixture being substantially free of an organic solvent. While agitating the reaction mixture, the temperature of the reaction mixture is raised to at least 50° C. to allow the TBPA to react with the PAA and AO to produce a diester composition. The reaction is terminated when the diester composition has an acid value equal to or less than 0.25 mg KOH/gm of the diester composition.

主权项

1. A tetrabromophthalic diester composition comprising a diester diol obtained by reaction of tetrabromophthalic anhydride, diethylene glycol, and propylene oxide, said diester diol having a formula wherein n is from 1 to 5, wherein the tetrabromophthalic diester composition has a viscosity of about 15,000 to about 40,000 cps at 25° C. and consists of a diester composition produced by reacting tetrabromophthalic anhydride with diethylene glycol, and propylene oxide in the absence of an organic solvent.