Effect of blending method on impact resistance

The impact resistant property of poly(vinyl chloride) (PVC) could be improv ed by the addition of finely powdered calcium carbonate (CC), and the facto rs such as kind of stabilizer, molecular weight of PVC, amount of plasticiz er, blending temparature, and bending process by a heat twin roller were in vestigated for the improvement. The impact resistant property of PVC was im proved by use of fatty acid salts as stabilizer. The higher the molecular w eight of PVC was and the larger the mixed amount of plasticizer to PVC was, the more excellent the impact resistant property was. Blending temparature and blending process by a heat twin roller were also significant factors f or the improvement. In particular, pre-blending process at low tempatatures showed remarkable effects. The observations by SEM revealed that the suffi cient dispersion of powdery CC, whose particle size was from 0.01 to 0.3 mu m, in the PVC matrix led to the remarkable improvement of the impact resist ant property.