2-(2-hydroxy-3-perflu oroalkylthiomethyl-5-alkylphenyl)-2H-benzotriazoles, processes for preparing them and stabilized compositions thereof
AssigneeCiba-Geigy Corporation
InventorsRobert A. Falk, Gregory R. Coughlin
Life of this patent
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Abstract
2-(2-Hydroxy-3-perfluoroalkylthiomethyl-5-alkylphenyl)-2H-benzotriazoles are prepared by reacting the Mannich base hydrohalide or quaternary salt of a 2-(2-hydroxy-5-alkylphenyl)-2H-benzotriazole with a perfluoroalkyl mercaptan. The products exhibit outstanding efficacy in protecting organic substrates from light induced deterioration as well as good resistance to loss by volatilization or exudation during the processing of stabilized compositions at elevated temperatures.
Claims13
A composition stabilized against the deteriously effects of actinic light which comprises
- (a) an organic material subject to light-induced deterioration, and
- (b) an effective stabilizing amount of a compound of formula I ##STR8## wherein T.sub.1 is hydrogen, halogen, alkyl of 1 to 4 carbon atoms or alkoxy of 1 to 4 carbon atoms,
- T.sub.2 is alkyl of 1 to 18 carbon atoms, cycloalkyl of 5 to 12 carbon atoms or phenylalkyl of 7 to 15 carbon atoms,
- E is a branched or straight chain alkylene of 1 to 10 carbon atoms or said alkylene interrupted by one to three groups selected from the group consisting of --NR--, --O--, --S--, --SO.sub.2 --, --COO--, --OOC--, --CONR--, --NRCO--, --SO.sub.2 NR--, --NRSO.sub.2 --, or terminated at the R.sub.f end with --CONR-- or --SO.sub.2 NR--, where R.sub.f is attached to the carbon or sulfur atom, and where R is independently hydrogen, alkyl of 1 to 6 carbon atoms or hydroxyalkyl of 2 to 6 carbon atoms, and
- R.sub.f is a straight or branched chain perfluoroalkyl of 1 to 12 carbon atoms, perfluoroalkyl of 2 to 6 carbon atoms substituted by perfluoroalkoxy of 2 to 6 carbon atoms, or R.sub.f is an oligo(hexafluoropropene oxide) terminal group.
A process for the preparation of a compound of formula I ##STR9## wherein T.sub.1 is hydrogen, halogen, alkyl of 1 to 4 carbon atoms or alkoxy of 1 to 4 carbon atoms,
- T.sub.2 is alkyl of 1 to 18 carbon atoms, cycloalkyl of 5 to 12 carbon atoms or phenylalkyl of 7 to 15 carbon atoms,
- E is a branched or straight chain alkylene of 1 to 10 carbon atoms or said alkylene interrupted by one to three groups selected from the group consisting of --NR--, --O--, --S--, --SO.sub.2 --, --COO--, --OOC--, --CONR--, --NRCO--, --SO.sub.2 NR--, --NRSO.sub.2 --, or terminated at the R.sub.f end with --CONR-- or --SO.sub.2 NR--, where R.sub.f is attached to the carbon or sulfur atom, and where R is independently hydrogen, alkyl of 1 to 6 carbon atoms or hydroxyalkyl of 2 to 6 carbon atoms, and
- R.sub.f is a straight or branched chain perfluoroalkyl of 1 to 12 carbon atoms, perfluoroalkyl of 2 to 6 carbon atoms substituted by perfluoroalkoxy of 2 to 6 carbon atoms, or R.sub.f is an oligo(hexafluoropropene oxide) terminal group;
- by reacting a compound of formula III ##STR10## with an amine of formula NHR.sub.1 R.sub.2 and formaldehyde to form a Mannich base of formula II ##STR11## where R.sub.1 and R.sub.2 are independently alkyl of 1 to 6 carbon atoms, which is then converted to a hydrohalide or quaternary salt and reacted with a mercaptan of formula R.sub.f --E--SH to give the compound of formula I, where T.sub.1, T.sub.2, E and R.sub.f are as defined above.
Dependencies are inferred from the claim text.