| 摘要 |
Compositions based on synthetic organic polymers or prepolymers are effectively stabilized against the damaging effects of light, oxygen and/or heat by addition of a compound of the formula I in which Z is a group of one of the formulae II or III, R7 and R17, independently of one another, are a radical of one of the formulae IV, V and VI and the remaining symbols are as defined in claim 1.
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