申请人:Ciba-Geigy Corporation
公开号:US04210578A1
公开(公告)日:1980-07-01
4-Siloxy derivatives of sterically hindered piperidines are effective light-stabilizers for plastics. These compounds have at least five alkyl groups in the ring positions 2, 3, 5 and 6 and four alkyl groups in ring positions 2 and 6, preferably methyl and ethyl groups. The ring nitrogen may be unsubstituted or substituted with a monovalent organic residue. The new compounds can be synthesized by O-silylation of 4-hydroxy-polyalkylpiperidines, preferably by reaction with chlorosilanes.
对于塞立克障碍哌啶的4-硅氧衍生物,它们是塑料的有效光稳定剂。这些化合物在环的2、3、5和6位至少有五个烷基基团,在环的2和6位至少有四个烷基基团,最好是甲基和乙基基团。环氮原子可以是未取代的,也可以与一价有机残基取代。新化合物可以通过与氯硅烷反应,首选通过4-羟基多烷基哌啶的O-硅烷化合成。