USE OF AN EXTRUSION PROCESSING AID FOR THE PRODUCTION OF COLOURED POLYETHYLENE PIPES

摘要

The present invention relates to the use of at least one UV stabilizer (A) of formula (I) as an extrusion molding aid for polyethylene compositions comprising one or more pigments (C), wherein R ₁ is unsubstituted or Aliphatic or aromatic hydrocarbyl radicals containing substituted heteroatoms; R ₂ , R ₃ , R ₅ and R ₆ are independently unsubstituted or substituted aliphatic C ₁ -C ₄ hydrocarbyl radicals and R ₄ is H or CH ₃ .