Improve stability of polymers against thermal degradation and aging.
The constant exposure of polymers to oxygen during their production, processing, and use leads to gradual oxidation.
This is especially the case for post-consumer recycled materials or regrinds that can be subjected to intense heating and mechanical stresses multiple times.
Oxidation affects the chemical structure of polymers and can lead to poor mechanical and optical properties. Certain types of plastic are more susceptible to oxidation than others and require specific additives in order to be processed successfully.
Such additives are primary and secondary antioxidants that inhibit oxidation during the life cycle of the finished good as well as during thermal processing and thus protect the plastic from aging.