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 processing aid for a polyethylene composition comprising one or more pigments (C), wherein R ₁ is an unsubstituted or An aliphatic or aromatic hydrocarbyl radical comprising a substituted heteroatom; R ₂ , R ₃ , R ₅ and R ₆ are independently an unsubstituted or substituted aliphatic C ₁ -C ₄ hydrocarbyl radical and R ₄ is H or CH ₃ .