| 摘要 |
The invention relates to dimeric 2-(2'-hydroxyphenyl)benzotriazoles of the formula I <IMG> (I) in which p is 0 or 1; A is C1-C12 alkylene; R1 and R'1, independently of one another, are hydrogen, halogen, C1-C18alkyl, C1-C18alkoxy or -CN; R2 and R'2, independently of one another, are hydrogen or C1-C18alkyl or together are C2-C12alkylene or C2-C12 hydroxyalkylene; and R3 and R'3, independently of one another, are hydrogen, halogen, C1-C18 alkyl orC1-C18 alkoxy. The compounds of formula I are highly suitable for the stabilization of organic material against the harmful effects of heat, oxygen and light, in particular UV radiation.
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