Plastics & Rubber-Window profiles

Coated precipitated calcium carbonate (CPCC) improves gelation and processing, surface finish and impact resistance in extrusion profile PVC compounds.

CPCC is a unique additive which can provide both a processing aid and impact modification function without any adverse effects.

To achieve the high impact strengths required, most formulations contain organic impact modifier. These modify the physical properties of the PVC but also have to be used at high loading which has a negative effect on the processing melt rheology. This has a negative effect on processing and surface finish properties. CPCC used to replace the natural calcium carbonate in the formulation will improve all the processing properties and allow reduction in impact modifier and process aid levels.

The surface finish of extruded profiles can be very important (especially in window systems) and the incorporation of CPCC provides a high gloss, high integrity surface finish without the need for additional effort. The ultrafine particle size of the synthetic calcium carbonate and the melt reinforcement effect are the explanation for this observation.

See also  Cables | Extrusion CPVC | Injection molding | PVC Pipes | Rigid Foam

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