The invention relates to ultraviolet light absorbing compounds, their preparation and uses as protective agents and stabilizers in coatings, plastics and topically applied products. The compounds are ketone derivatives of 2-(2-hydroxyphenol) benzotriazole of formula I,
where R
1
is hydrogen atom, or a halogen atom, or a straight-chain or branched lower alkyl or lower alkoxy of 1 to 4 carbon atoms; R
2
is an unsubtituted or substituted aryl group or an unsubstituted or substituted straight-chain or branched alkyl having 1 to 18 carbon atoms or a cycloaliphatic group having 5 to 6 carbon atoms; and R
3
is a straight-chain or branched alkyl or alkylaryl group or alkoxyl or phenyl or phenyl substituted with alkyl, cycloalkyl, carboalkoxy, chlorine or arylalkyl groups.
本发明涉及紫外线吸收化合物,它们的制备以及在涂料、塑料和局部应用产品中作为保护剂和稳定剂的用途。该化合物是式I中的2-(2-羟基
苯基)
苯并三唑的
酮衍
生物,其中R1是
氢原子、卤素原子、1至4个
碳原子的直链或支链低级烷基或低级烷
氧基;R2是未取代或取代的芳基基团或未取代或取代的1至18个
碳原子的直链或支链烷基或5至6个
碳原子的
环烷基团;R3是直链或支链烷基或烷基芳基基团或烷
氧基或
苯基或被烷基、
环烷基、羧基烷
氧基、
氯或芳基烷基基团取代的
苯基。