Improvement of impact resistant property of poly(vinyl chloride) filled with calcium carbonate

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 for the improvement were investigated including kinds of stabilizer and CC, blending time and temparature of a heat twin roller, a solvent, and ult rasonication. As a result, CC of 0.1 similar to 0.3 mu m in diameter treate d with some fatty acid salts showed the excellent effects. Blending tempara ture of a heat twin roller was significant, and at 200 degrees C, the impac t resistant property became maximum. Usege of a solvent and ultra sonic wav e was also effective. These results indicate that the impact resistant prop erty is improved remarkably, when powdery CC (particle size, 0.1 to 0.3 mu m) was dispersed sufficiently in the PVC matrix.