| 摘要 |
Compounds of the formula (I) <IMAGE> (I) in which m and n are numbers from 1 to 50; A is -O- or >N-R6 where R6 is e.g. hydrogen or C1-C18 alkyl; R1 and R4, which may be identical or different, are C1-C18alkyl, phenyl, C1-C8alkoxy, OH, ONa or OK; R2 is e.g. C2-C12alkylene; R3 is e.g. hydrogen or C1-C8alkyl; R5 is e.g. a group of the formula <IMAGE> in which R9 is e.g. 2,2,6,6-tetramethyl-4-piperidyl; A' has one of the meanings of A; p is e.g. 1 and R10 is e.g. C2-C18alkylene; X1 has one of the meanings of R1 or is a group (R27)3SiO- where R27 is C1-C18alkyl; X2 is hydrogen, Na, K, C1-C8alkyl or a group (R27)3Si- with R27 as defined above and, when m+n is a number from 3 to 10, X1 and X2 together can also represent a direct linkage; are useful as stabilizers for organic materials against degradation induced by light, heat or oxidation.
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