2-(Benzotriazol-2-yl)-4-alkyl-6-(2-hydroxy-3-benzoyl-benzyl)phenols of formula (I) are prepared by reacting a Mannich base of a 2-(2-hydroxy-5-alkylphenyl)-2H-benzotriazole with a 2-hydroxy-benzophenone. The hybrid products exhibit outstanding efficacy in protecting organic substrates from light-induced deterioration as well as good resistance to loss by volatilization or exudation during the processing of stabilized compositions at elevated temperatures. whereinT₁ is hydrogen, chloro, alkyl of 1 to 4 carbon atoms or -SO₃H,T₂ is alkyl of 1 to 12 carbon atoms,E₁ is hydrogen, chloro or -OE₂,E₂ is hydrogen or alkyl of 1 to 18 carbon atoms,E₃ is hydrogen, alkyl of 1 to 4 carbon atoms, chloro or -SO₃H,E₄ is hydrogen, chloro or -OE₅,E₅ is hydrogen or alkyl of 1 to 18 carbon atoms, andE₆ is hydrogen, hydroxyl or carboxy.
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