Patent attributes
Flame retardant formulations comprised of at least one bromine-containing polyol are produced by a process which comprises:A) heating a mixture formed from components comprised of (i) tetrabromophthalic anhydride, (ii) at least one aliphatic polyol, and (iii) at least one liquid straight chain aliphatic diester of a straight-chain alkane dicarboxylic acid to form an intermediate composition; andB) contacting all or a portion of the intermediate composition one or more times with (iv) at least one alkylene oxide that results in the formation of a liquid product formulation, and optionally, removing any excess alkylene oxide present;the amounts of (i), (ii), (iii), and (iv) used being proportioned to form a formulation having a bromine content of at least about 40 wt %, a viscosity at 25° C. of about 20,000 cps or less, and an acid number as determinable by aqueous sodium hydroxide titration and expressed in terms of potassium hydroxide, of less than about 1 milligram of KOH per gram of the formulation.
