SUBSTITUTED BENZOTRIAZOLES, STABILIZED COMPOSITIONS AND COVERING SYSTEM Russian patent published in 1999 - IPC

FIELD: organic chemistry. SUBSTANCE: invention relates to substituted benzotriazoles of the general formula (A) where R₁ - a direct-chain or branched alkyl containing 1-24 carbon atoms; R₂ - a direct-chain or branched alkyl containing 1-24 carbon atoms being the indicated alkyl can be substituted with one or more hydroxy-group, or R₂-CH₂CH₂COR₅ where R₅ is NH₂ or OR₆ where R₆ - hydrogen, alkyl containing 1-24 carbon atoms, or OR₆-(OCH₂CH₂)_w-OH where w = 1-12, or R₂-(CH₂)_m-CO-X(Z)_p-Y-R₁₅ where X and Y are -O-; Z - alkylene containing 3-13 carbon atoms substituted with hydroxyl-group; R₁₅ is -CO-C(R₁₈)=CH₂ where R₁₈ - hydrogen or methyl; m = 0, 1 or 2; p = 1; R₃ is C_8-20-alkyl, C_6-10-aryl, or means radical of the formula where E is C₂-C₁₂-alkylene, C₅-C₁₂-cycloalkylene or C₈-C₁₂-alkylene broken off by cyclohexylene; r = 0 or 1 and L is -S)- or SO₂. On the basis of compounds (A) a stabilized composition is obtained that contains polymer that can be decomposed by nonfavorable effect of actinic radiation and covering system consisting of lower and upper polymer layers containing effective amount of compound (A). UV-absorbing agents based on 2-(2-hydroxyphenyl)-2H-benzotriazoles substituted with sulfoxide or sulfonic group at position 5 of benzo-ring show enhanced absorption at near-visible range (above 350 nm) that ensures to use these compounds as effective protective agents of polymeric systems that can be decomposed by actinic radiation at wavelength above 350 nm. EFFECT: improved method of synthesis, enhanced effectiveness of compounds. 21 cl, 36 ex