Linear copolyester containing phosphorous, procedure for its preparation and its use as a flame-retardant additive

摘要

A linear copolyester is prepared by polycondensation of an aromatic bicarboxylic acid with an alkylene glycol and with a carboxyphosphinic acid or anhydride which produces monomeric units having the formula: wherein R₁ is an alkylene or phenyl radical and R₂ is an alkyl or phenyl radical.This copolyester can be used as a flame-retardant additive for organic polymers.