| 摘要 |
The present invention relates to novel piperidine compounds of the formula (I) <IMAGE> (I) in which A is e.g. a group of the formula <IMAGE> where R4 is e.g. hydrogen or methyl, X3 is e.g. -O- or -NH- and R5' is e.g. ethylene, propylene or decamethylene, R1 is e.g. methyl, methoxy, ethoxy or OH, R2 and R3 are e.g. methyl, m+n is e.g. a number from 1 to 40, n varies e.g. from zero to 50% of the sum m+n, X1 is e.g. as defined for R1 or is a group (CH3)3SiO- and X2 is e.g. hydrogen, methyl, ethyl, a group (CH3)3Si- or a group <IMAGE> and, when m+n is a number from 3 to 10, X1 and X2 together also form a direct bond. The compounds of the formula (I) are effective in stabilizing an organic material against thermal, oxidative and light-induced degradation.
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