PROCESS FOR PREPARING MONOMERS USEFUL TO THE SYNTHESIS OF REGULAR POLYESTER-AMIDES AND POLYESTER-AMIDES OBTAINED THEREBY

摘要

1365952 Diesteramides SNAM PROGETTI SpA 12 Oct 1971 [13 Oct 1970 (2)] 47521/71 Heading C2C [Also in Division C3] Diesteramides having the general formula wherein each RSP4/SP is a hydrocarbon radical selected from alkyl radicals having from 1 to 8 carbon atoms, aryl radicals having from 6 to 10 carbon atoms, and cycloalkyl radicals having from 4 to 10 carbon atoms with the proviso that, when one radical RSP4/SP is an aryl radical, the other radical RSP4/SP is not an acyclic alkyl radical; and each of A and B, which may be the same or different, is an unsubstitued or substituted aliphatic or aromatic, divalent radical having from 2 to 30 carbon atoms, are prepared by reacting a dicarboxylic acid ester of the formula with a diamine of the formula there being present during the reaction more than two moles of the dicarboxylic acid ester for each mole of diamine. The diesteramides prepared according to the invention may be used in the preparation of polyesteramides.