A stabilizer mixture containing A) either (A1) at least one compound of the formula ##STR1##

in which R1 is for example hydrogen or C1-C8alkyl; R2, R3, R5 and R6 are for example hydrogen, C1-C30alkyl or phenyl; R4 is for example C1-C30alkyl or 2,2,6,6-tetramethyl-4-piperidyl; and n1 is a number from 1 to 50; or (A2) at least one compound of the formulae ##STR2##

wherein n2 and n2* are a number from 2 to 50;

  • B) magnesium oxide, magnesium hydroxide, zinc oxide, zinc hydroxide or an organic salt of zinc or magnesium; and
  • C) either
  • (C1) an UV absorber or
  • (C2) a pigment or
  • (C3) an UV absorber and a pigment;
  • with the proviso that, when component A) is at least one compound of the formulae (IIIa) and (IIIb), component B) is magnesium oxide, magnesium hydroxide or an organic salt of zinc or magnesium.
  • Such a stabilizer mixture is particularly useful for stabilizing a polyolefin against light-induced degradation.

     
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