During times of rising resin prices, the PVC processor is forced to optimize his operations in order to reduce manufacturing costs. One option the processor has is to increse the filler concentration in order to reduce formulation costs. Chlorinated polyethylene (CPE), an uncrosslinked rubber impact modifier for rigid PVC applications, allows the processor to significantly increase the filler concentration without suffering loss of impact strength or processing penalties. A mechanism is postulated, which is confirmed by Scanning Transmission Electron Microscopy (STEM), extrusion and impact measurements, that CPE domain breakup and dispersion are synergistic with the addition of calcium carbonate.
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Ventresca et al. (1997) studied this question.
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