Method for stabilizing polyolefin films against UV degradation

摘要

The invention relates to a method for the stabilization of polyolefin films against degradation in the presence of agrochemicals comprising incorporation into the polyolefin a stabilizer composition comprising i) at least one o-hydroxyphenyl triazine ultraviolet light absorber (I) selected from 2-(2'-hydroxyphenyl)-1,3,5-triazine compounds ; ii) at least one ultraviolet light stabilizer selected from tetramethyl-4-piperidinyl compounds (II) according to Formula IIwherein: X represents a bridging group selected from the group of -O-C(=O)- , -CR'₂-C(=O)-, -CR'₂-C(=O)-NR'- , -NR'-C(=O)- , -C(=O)-NR'- , -O- , -NR'- or -C(=O)- where each R', independently, represents H or C_1-20 hydrocarbyl; Z represents H, -R, -C(=O)-R or -OR where R is a C_1-20 hydrocarbyl, said hydrocarbyl being optionally substituted with one or more hydroxyl, C_1-30 alkoxy or C_2-30 alkanoyl; R³ is a C_6-30 hydrocarbyl; each of R¹ and R² is, independently, chosen from H and C₁-C₆ alkyl; and iii) at least one light stabilizer (III) chosen from hindered amine light stabilizers (HALS) different from compound of formula II.