On the heat stabilization efficiency of polyester plasticizers for poly(vinyl chloride) (PVC)

Four different polyester plasticizers for poly(vinyl chloride) (PVC), havin g moderate acid numbers (11.5-20.5 mg KOH/g resin), were synthesized. These were modified by converting the terminal group to Ba(II) and Cd(II) carbox y-late salts-in order to introduce the capability of heat stabilization for PVC. The modified polyesters were applied as dual function polyesters, i.e ., a plasticizers and stabilizers at the same time. The thermal stabilizati on efficiency of the formed plasticized PVC films was tested photometricall y and the data obtained were compared with that afforded by "Irgastab BZ 55 6". The efficiencies of these modified polyesters as heat stabilizers for P VC were found to be comparable with that afforded by "Irgastab BZ 556".