Substituted benzamidines and their salts are useful as ultraviolet light absorbers, the benzamidines having the formula
wherein
A¹ and A² may be the same or different and represent, e.g., -COOR¹, -CONR¹R², -CN or -C₆H₅, A³ represents -H, -OH, -OR, -Cl, -NO₂, -CN, -C₆H₅, or an alkyl group of one to five carbon atoms, R¹ and R² may be the same or different and represent hydrogen or an alkyl group of one to ten carbon atoms, and R represents an alkyl group of one to ten carbon atoms.
取代的
苯并咪啶及其盐类可用作
紫外线吸收剂,这些
苯并咪啶具有以下式子
其中
A¹ 和 A² 可以相同或不同,例如代表-COOR¹、-CONR¹R²、-CN 或-C₆H₅,A³ 代表-H、-OH、-OR、-Cl、-NO₂、-CN、-C₆H₅ 或一至五个
碳原子的烷基,R¹ 和 R² 可以相同或不同,代表
氢或一至十个
碳原子的烷基,R 代表一至十个
碳原子的烷基。