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Flexible PVC stabilization: the phosphite approach

SpecialChem / Mar 29, 2002

Addressing environmental concerns while maintaining levels of performance and profitability is becoming increasingly important to processors. Advanced phosphite ester technology for flexible PVC developed by Dr. Don Stevenson, Mark Harr, Bill Hood and Tom Jennings of Dover Chemical Corporation is now demonstrating improved performance, reduced processing costs and a reduction or elimination of toxic heavy metals and solvents. Plastics Additives & Compounding reports on recent developments at Dover Chemical. Flexible PVC has been an important synthetic alternative to natural rubber since the 1940s, where its non-flammability made it ideal for wire insulation, particularly on naval ships. However, unlike rubber it has a tendency to discolour and is not easy to process well. Stabilization is required to perform two basic functions - to provide lubrication and absorb hydrogen chloride (HCl), which evolves during processing. In the course of stabilizer development, various metal soaps have been tried for lubrication, because they also were good absorbers of HCl.

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