Antioxidant compositions

摘要

A stabilising composition for polymeric materials comprises a phenolic antioxidant and at least one secondary arylamine of Formula I: wherein each R group is independently an optionally substituted higher aliphatic hydrocarbyl group (e.g. C5 and above) and x and y are independently 0 to 5 with the proviso that x+y is at least 1. The composition and/or the secondary arylamine is a liquid at ambient conditions and is substantially free (e.g. less than 2 wt.%) from diphenylamine and/or from lower alkylated (e.g. C4 and below) diphenylamine antioxidants. The hydrocarbyl group is preferably alkyl and typically, x and y are both 1. Use of the stabilizing composition to stabilize a polyol or polyurethane is also disclosed. In particular, a process for producing a polyurethane comprises adding the stabilizing composition to a polyol and subsequently reacting the combination with an isocyanate to form the polyurethane.