PROCESS FOR THE PRODUCTION OF POLY(O-ALKYLURETHANES) OF THE DIPHENYL METHANE SERIES

摘要

Mo3698 LeA 28,203 The present invention relates to an improved process for the production of monomeric and polymeric poly(0-alkylure-thanes) of the diphenyl methane series. The process comprises the reaction of the corresponding amines with dialkyl carbonates in the presence of a catalyst, followed by the isolation of the products in a highly pure form. The invention also relates to the use of the produced monomeric and polymeric poly(0-alkylurethanes) for the production of the corresponding isocyanates.