| 摘要 |
The present invention relates to novel co-oligomers containing recurring units of the formulae (Ia) and (Ib) <IMAGE> (Ia) <IMAGE> (Ib) which have a number average molecular weight of e.g. from 1,000 to 5,000 and a (Ia):(Ib) ratio of e.g. 1:1, and in which R1 and R5 are e.g. N-(2,2,6,6-tetramethyl-4-piperidyl)-n-butylamino, R2 is e.g. 2,2,6,6-tetramethyl-4-piperidyl, R3 is e.g. hexamethylene, R4 is e.g. hydrogen and X is e.g. a group <IMAGE> These compounds are particularly suitable for stabilizing organic materials against light, heat and oxidation.
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