Product Description

Irgafos 168 is a hydrolytically stable phosphite processing stabilizer. As a secondary antioxidant, it reacts during processing with hydroperoxides formed by the autoxidation of polymers, preventing process-induced degradation and extending the performance of primary antioxidants. Irgafos 168 is an organophosphite of low volatility and is particularly resistant to hydrolysis; it protects polymers prone to oxiation — during compounding/pelletizing, fabrication, and recycling — from molecular weight change (by chain scission or crosslinking) and prevents discoloration. Irgafos 168 performs best when combined with other BASF antioxidants; blends with hindered phenols of the Irganox range (Irganox B-blends) are particularly effective — the hindered phenols additionally provide storage stability and give the polymer long-term protection against thermooxidative degradation. See also Irganox 1010, a hindered phenolic primary antioxidant from the Irganox range that the manufacturer specifically recommends blending with Irgafos 168. Irgafos 168 comprised in phenol-free systems with other appropriate BASF stabilizers addresses specific stabilization requirements.

Technical Data

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Application

The application range of Irgafos 168 — synergistically combined with other BASF antioxidants — comprises polyolefins and olefin copolymers such as polyethylene (e.g., HDPE, LLDPE), polypropylene, polybutene, and ethylene-vinylacetate copolymers, as well as polycarbonates and polyamides. Blends can also be used in polyesters, styrene homo- and copolymers, adhesives, and natural and synthetic tackifier resins, elastomers such as BR, SEBS, and SBS, and other organic substrates. Irgafos 168 blends can be used in combination with light stabilizers of the Uvinul, Tinuvin, and Chimassorb ranges.