Abstract: 2-[2-Hydroxy-3,5-di-tert-octylphenyl]-2H-benzotriazole exhibits outstanding efficacy in protecting organic substrates from light induced deterioration as well as good resistance to loss by volatilization or exudation during the high temperature processing of stabilized compositions.The combination of the benzotriazole UV absorber with a hindered amine light stabilizer is particularly efficacious in protecting thermoset and thermoplastic acrylic resin automotive finishes and enamels.

Abstract: Substituted 2-nitro-2'hydroxyazobenzenes are prepared by adding an aqueous mineral acid solution of a diazotized o-nitroaniline to a strongly alkaline lower alkanol or aqueous lower alkanol solution of a substituted phenol, containing sufficient alkali metal hydroxide to assure a pH value substantially over 11 and an excess of hydroxyl ion in the reaction mixture even after all the acidic diazonium salt solution is added, wherein the reaction solvent mixture is at least 50% by weight of lower alkanol, at a reaction temperature between -15.degree. C. and +30.degree. C.The o-nitroazobenzenes obtained are intermediate products useful in the manufacture of benzotriazole UV absorbers.

Abstract: Compounds of the formula ##STR1## in which R.sub.1 denotes aryl, alkyl, aralkyl, styryl or alkoxy,R.sub.2 denotes hydrogen, cyano, carboxyl or alkoxycarbonyl, inter alia,R.sub.3, R.sub.4, R.sub.6 and R.sub.7 denote hydrogen, alkyl, alkoxy or halogen,R.sub.5 denotes hydrogen, alkyl or aryl,R.sub.8 and R.sub.9 denote hydrogen, cycloalkyl, alkenyl, alkyl or aralkyl,A.sup..crclbar. denotes an anion,w denotes the valency of the anion A andn denotes 0 or 1,are outstandingly suitable for optically brightening synthetic fibre materials, in particular acrylic fibres.The new brighteners are prepared and used in accordance with methods which are in themselves known.

Abstract: The invention relates to bichromophoric benzotriazole-styrene ester compounds which have been found to be effective ultraviolet stabilizers. The invention also relates to ultraviolet degradable organic compositions containing a stabilizing amount of the bichromophoric composition to prevent such degradation. These stabilizers are effective in the presence of other additives commonly employed in polymeric compositions including, for example, pigments, colorants, fillers, reinforcing agents and the like. These ultraviolet stabilizers may also be incorporated into the organic compositions in the polymer melt or dissolved in the polymer dope, coated on the exterior of the molded article, film or extruded fiber.

Abstract: A process for the production of 2-aryl-2H-benzotriazoles comprises reducing and cyclizing the corresponding o-nitroazobenzenes with hydrogen at a temperature in the range of about 20.degree. C. to about 100.degree. C. and at a pressure in the range of about 15 psia (1 atmosphere) to about 1000 psia (66 atmospheres) in an organic solvent mixture containing an organic amine at a pH over 10 in the presence of noble metal hydrogenation catalyst, preferably palladium. High yields of pure product are obtained with a concomitant reduction of undesired by-products and a reduction in effluent pollution problems.

Abstract: A two stage reductive ring closure of o-nitrophenylazophenols produces 2-aryl-2H-benzotriazoles by (a) reacting an organic solvent solution of azophenol with an excess of an aqueous solution of a sulfhydrate or sulfide to form an N-oxide and (b) reducing the N-oxide with an alkali metal hydroxide plus zinc or tin.

Abstract: A process for producing benzotriazoles of the formula I ##STR1## wherein R.sub.1 is hydrogen or chlorine,R.sub.2 is hydrogen, chlorine, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, C.sub.2 -C.sub.9 alkoxycarbonyl, carboxyl or sulfo,R.sub.3 is C.sub.1 -C.sub.12 alkyl, C.sub.1 -C.sub.4 alkoxy, phenyl, (C.sub.1 -C.sub.8 alkyl)-phenyl, C.sub.5 -C.sub.6 cycloalkyl, C.sub.2 -C.sub.9 alkoxycarbonyl, chlorine, carboxyethyl or C.sub.7 -C.sub.9 phenylalkyl,R.sub.4 is hydrogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, chlorine or hydroxyl, andR.sub.5 is hydrogen, C.sub.1 -C.sub.12 alkyl, chlorine, C.sub.5 -C.sub.6 cycloalkyl or C.sub.7 -C.sub.9 phenylalkyl,which process comprises treating a benzotriazole-N-oxide of the formula II ##STR2## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 have the above meanings, at a temperature of 20.degree.-150.degree. C., with an amine; or treating an o-nitroazobenzene of the formula III ##STR3## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.

Abstract: A process for the production of 2-aryl-2H-benzotriazoles comprises reducing and cyclizing the corresponding o-nitroazobenzenes with hydrogen at a temperature in the range of about 20.degree. C. to about 100.degree. C. and at a pressure in the range of about 15 psia (1 atmosphere) to about 1000 psia (66 atmospheres) in an alkaline medium at a pH over 10 in the presence of a nickel catalyst, preferably molybdenum-promoted Raney nickel. High yields of pure product are obtained directly with a concomitant reduction of undesired by-product and a reduction in effluent pollution problems.

Abstract: There are provided complexes of metal salts prepared by (1) reacting a benzotriazole with a monoepoxide to form a hydroxyalkylbenzotriazole, (2) reacting the hydroxyalkylbenzotriazole with an alkenylsuccinic anhydride to form a monoester, and (3) converting the monoester to the salt of a metal which can form Werner complexes and complexing with a ligand containing amine, hydroxyl, oxazoline, or imidazoline groups to form a chelate. These chelates impart detergent and antiwear properties to lubricants.

Abstract: Novel hydrazines are disclosed in which one of the nitrogen atoms forms a ring member of the five membered ring of a [4.3.0] heterobicyclic compound which may be substituted elsewhere in the ring system. Characteristic ring systems described include indole and benztriazole ring systems. The compounds possess anti-depressant properties as well as anti-microbial, in particular fungistatic and bacteriostatic, properties.

Abstract: The invention relates to bis-benzotriazole compounds which have been found to be effective ultraviolet stabilizers. The invention also relates to ultraviolet degradable organic compositions containing a stabilizing amount of the bis-benzotriazole compounds to prevent such degradation. These stabilizing compounds are effective in the presence of other additives commonly employed in polymeric compositions including, for example, pigments, colorants, fillers, reinforcing agents and the like. These ultraviolet stabilizers may also be incorporated into the organic compositions in the polymer melt or dissolved in the polymer dope, coated on the exterior of the molded article, film or extruded fiber.

Abstract: This invention relates to new di-triazolylstyrene derivatives, useful as optical brighteners for organic polymeric materials, especially when applied to or incorporated in synthetic fibres.