DICARBOXYLIC ACIDS AND DICARBOXYLIC ACID ESTERS CONTAINING A 1,1'-METHYLENE-BIS-HYDANTOIN RADICAL

摘要

Abstract of the DisclosureDicarboxylie acids and dicarboxylic acid esters of the formulawherein both R1 each denote hydrogen, alkyl with 1 to 4 C atomsor phenyl, both R2 each denote hydrogen or alkyl with 1 to 10C atoms and, if the two R2 each denote hydrogen, the two n re-present numbers from 2 to 12 and, if the two R2 each denotean alkyl group with 1 to 10 C atoms, the two n representnumbers from 1 to 12, R3 denotes hydrogen, methyl or ethyl andR4 denotes methyl, ethyl, propyl or isopropyl, are preparedby reacting 1 mol of a 1,1'-methylene-bis-hydantoin of theformulaor its disodium or dipotassium salt with 2 mols of a compoundof the formulawherein Y1 denotes a chlorine or bromine atom. The dicarboxylicacid compounds are characterized by a high stability to heatand therefore very suitable for the manufacture of polyconden-sates by the melt condensation process.- la -