Substituted 1-hydroxy-2,6-diaryl-4-acyloxypiperidines or 1-hydroxy-2,6-diaryl-4-acylaminopiperidines of formula I ##STR1## wherein n is 1-4, Ar.sub.1 and Ar.sub.2 are independently aryl or substituted aryl, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are independently hydrogen, alkyl, substituted alkyl, alkenyl, aryl or substituted aryl, X is --O-- or --NE--, E is hydrogen, alkyl or cycloalkyl and T is n-valent aliphatic or aromatic hydrocarbon radical, are effective in stabilizing organic materials against the deleterious effects of oxygen, heat and actinic radiation.
公式I中的1-羟基-2,6-二芳基-4-酰氧基
哌啶或1-羟基-2,6-二芳基-4-酰
氨基
哌啶的取代物,其中n为1-4,Ar.sub.1和Ar.sub.2独立地为芳基或取代芳基,R.sub.1、R.sub.2、R.sub.3和R.sub.4独立地为氢、烷基、取代烷基、烯基、芳基或取代芳基,X为--O--或--NE--,E为氢、烷基或环烷基,T为n价脂肪族或芳香族碳氢基团,对于稳定有机材料抵抗
氧气、热和光辐射的有害影响是有效的。