Effect of stabilizers in the thermal treatment of PVC—XI.: Effect of the reaction products on the stability of PVC mixtures stabilized by barium and cadmium stearates

The effects of cadmium and barium chlorides and stearic acid on the thermal stability of PVC mixtures stabilized by barium and cadmium stearates respectively and by their equimolar combination have been studied under static conditions of thermal treatment at 180° in air. The stabilizing effect of cadmium stearate drops in the presence of stearic acid owing to the formation of higher co-ordination cadmium compounds, only formed in the simultaneous presence of cadmium chloride, stearic acid and hydrogen chloride. The synergism is thought to be associated with the possibility of formation of a complex compound of barium stearate with cadmium chloride or stearic acid.