Use of substituted benzazoles as UV absorbers, new benzazoles and processes for their preparation

摘要

N-Substituted 2-(benzimidazol-2-yl)-benzothiazole, 2,2'-bisbenzimidazole and 2-(benzimidazol-2-yl)-benzoxazole compounds (IA) of formula (A) are new; in which X = sulphur (S), imino (NH), substituted imino (NR1) or oxygen (O); R1 = 5-20 carbon (C) alkyl; R8-15 = hydrogen (H), amino, nitro or R1. Also claimed is the use of a wider range of compounds (I) as ultraviolet (UV) absorbers of formula (A); in which R1 = 1-20C alkyl, 2-20C alkenyl, 3-15C cycloalkyl, 6-12C aryl, 6-12C ar-(1-6 C)-alkyl, 1-20 C alkoxycarbonyl or 5-12 C hetaryl, which may be substituted by 1-6 C alkyl, 1-16 C alkoxy, 6-12 C aryloxy, amino, hydroxyl, CONR2R3, COOR4 and Si(OR7)3; R2, R3 = H or 1-16 C alkyl; R4 = H, 1-16 C alkyl, 6-12 C aryl or R5-O-(CH2-CH(R6)-O-)n-CH2-CH(R6)-; R5 = 1-4 C alkyl; R6 = H or methyl (Me); n = 0-4; R7 = 1-4 C alkyl.