Question

What is the use of antioxident for pp processing?

Answer 1

Primary antioxidants, such as hindered phenols, function mainly by scavenging the peroxy radical intermediates in the oxidation process. In general they are effective over a wide temperature range, and are useful to improve both the processing and long-term thermal stability of plastics.

Answer 2

Primary antioxidants and thioesters are added to the polymer to provide end use product stability while phosphites or phosphonites are added to provide color and processing stability during pelletization and extrusion/molding.

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