| 摘要 |
Blocked benzotriazoles of the formula I or II <IMAGE> I <IMAGE> II where x is 1 or 2, R1 in the case of x=1 and in the formula II is an acyl group of the formula -CO-R5, a sulfonyl group of the formula -SO2-R6, a phosphoryl group of the formula -P(O)r(R14)(R15), and in the case of x=2 is -CO- or a diacyl group of the formula -CO-CO- or -CO-R7-CO-, and R2, R3, R4, R5, R6, R7, R14 and R15 have the meanings defined in claim 1, are crypto light stabilizers which can be activated by short-wave irradiation. Their use in coating materials is of interest in cases in which light stabilizers containing the free OH compounds have disadvantages with regard to their application.
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