2-(2-Hydroxyphenyl)-benztriazoles, their use as UV-absorbers and their preparation
AssigneeCiba-Geigy Corporation
InventorsJean Rody, Mario Slongo
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Abstract
The novel UV-absorbers are compounds of the formula ##STR1## in which R.sup.1 is, for example, hydrogen, n is one of the numbers 1 or 2 and R.sup.2 is an appropriate monovalent or divalent radical, for example --OH or --O--CH.sub.2 CH.sub.2 --O--. The UV-absorbers are used in particular for stabilising and improving lacquers and photographic material.
Claims5
A compound of the formula I ##STR40## in which R.sup.1 is H, Cl or straight-chain or branched C.sub.1 -C.sub.4 alkyl and n is one of the numbers 1 or 2, in which,
- (a) when n=1, R.sup.2 is Cl or --OR.sup.3, and
- (b) when n=2, R.sup.2 is --O--R.sup.9 --O--, R.sup.3 is H, straight-chain or branched C.sub.1 -C.sub.18 alkyl which is unsubstituted or substituted by 1 to 3 OH groups or straight-chain or branched C.sub.3 -C.sub.18 alkyl which is interrupted by --O-- or --S-- and which can be unsubstituted or substituted by OH, C.sub.5 -C.sub.12 cycloalkyl which is unsubstituted or substituted by OH, straight-chain or branched C.sub.2 -C.sub.18 alkenyl which is unsubstituted or substituted by OH, C.sub.7 -C.sub.15 aralkyl, or ##STR41## R.sup.9 is C.sub.2 -C.sub.8 alkylene, C.sub.4 -C.sub.8 alkenylene, cyclohexylene, straight-chain or branched C.sub.4 -C.sub.10 alkylene which is interrupted by --O--, and R.sup.11 is straight-chain or branched C.sub.2 -C.sub.8 alkylene, straight-chain or branched C.sub.4 -C.sub.10 alkylene which is interrupted by --O--, cycloalkylene, arylene, ##STR42##
A mixture of 2-[2-hydroxy-3-tert.-butyl-5(2-carbo-n-octyloxyethyl)-phenyl]-5-chlorobenz triazole and 2-{2-hydroxy-3-tert.-butyl-5-[2-carbo-(2-ethylhexyl)-oxyethyl]-phenyl}-5-c hlorobenztriazole in a ratio by weight of 1:1.
Dependencies are inferred from the claim text.