PROCESS FOR THE PREPARATION OF GLYCIDYLESTERS OF BRANCHED CARBOXYLIC ACIDS

摘要

Process for the manufacture of diglycidylesters of alpha , alpha '-branched dicarboxylic acids, comprising (a) the reaction of the alpha , alpha '-branched dicarboxylic acid with a halo substituted monoepoxide such as an epihalohydrin, in a 1.1-20 acid equivalent ratio relative to the alpha , alpha '-branched aliphatic dicarboxylic acid, optionally in the presence of water and water-miscible solvent, and in the presence of a catalyst in an amount of at most 45 mol% of the acid equivalent amount of the alpha , alpha '-branched aliphatic dicarboxylic acid, at a temperature in the range of from 30 to 110 DEG C, during a period in the range of from 0.5 to 2.5 hr, (b) addition of alkali metal hydroxide or alkali metal alkanolate up to an acid equivalent ratio as to the alpha , alpha '-branched aliphatic dicarboxylic acid in the range of from 0.9:1 to 1.2:1, and reaction at a temperature of from 0 to 80 DEG C, (c) distillation of the obtained reaction mixture to remove the excess halo substituted monoepoxide and the solvent and water formed, and (d) removal of alkali metal halide salt, preferably by washing the obtained diglycidylester with water mixed with an inert organic solvent, after optionally treating the residual product with a concentrated aqueous alkali metal hydroxide solution, in order to complete the dehydrohalogenation.