Ultraviolet light absorbing ketones of 2-(2-hydroxyphenyl) benzotriazole
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 R1 is hydrogen atom, or a halogen atom, or a straight-chain or branched lower alkyl or lower alkoxy of 1 to 4 carbon atoms; R2 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 R3 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.
A G C A C C
A61K G03C C08K A61Q C08K C07D
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Chia-Hu
Chang