Metal Deactivator

Metals can accelerate thermal oxidation of polyolefins and related plastics. To prevent metal-catalyzed degradation, it is often necessary to combine antioxidants with metal deactivators if they do not contain moieties with free radical scavenging properties.

TINTOLL metal deactivators prevent oxidative degradation caused by copper or other metals by chelating them. A common feature of chelating agents is their versatility. They contain multiple ligand atoms, such as N, O, S, P, often bound to functional groups such as hydroxyl, carbonyl, or urea. Different substituents can affect properties such as polarity, volatility, miscibility, and UV absorption spectrum.

Many metal deactivators can also act as UV absorbers by competitively absorbing harmful UV radiation. These compounds generally have a greater ability to absorb UV light than the polymers they protect, thus imparting high UV stability to the polymers.