| abstract |
Liquid 2-(2-hydroxy-3-higher branched alkyl-5-methylphenyl)-2H-benzotriazole mixtures are prepared by alkylating 2-(2-hydroxy-5-methylphenyl)-2H-benzotriazole with a straight chain alkene or with a branched chain alkene of 8 to 30 carbon atoms in the presence of an acidic catalyst at 100 DEG -200 DEG C. The liquid mixtures 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. |