Hindered amine light stabilizers are provided in which the hindered amine is contained in a unit of formula ##STR1## where X is ##STR2## and R.sup.1, R.sup.2, R.sup.3 and A are as defined as in the Summary of the Invention. Unique polymeric and non-polymeric compounds containing this unit are useful as additives for the stabilization of polymeric compositions which are normally subject to thermal, oxidative or actinic light degradation.
提供了含有阻抗胺的
光稳定剂,其中阻抗胺包含在以下公式的单位中:##STR1## 其中X为##STR2##,R.sup.1,R.sup.2,R.sup.3和A的定义如本发明摘要所述。含有该单元的独特聚合物和非聚合物化合物可用作添加剂,用于稳定通常易于受热、氧化或光降解的聚合物组合物。