Initiators for polymerisation of alpha, alpha - initiators for polymerisation of alpha alpha dialkyl-beta-p

摘要

The initiators used are N-alkyl-substd. acids of P(III) or P(IV) of formula: wherein R' and R" are aliphatic residues or form heterocycles with the amide nitrogen, and R are aryl, alkyl, aroxy, alkoxy or The products are film- and fibre-forming polyesters.