Showing papers on "Benzotriazole published in 1981"

Succinic half‐esters of poly(ethylene glycol)s and their benzotriazole and imidazole derivatives as oligomeric drug‐binding matrices

Abstract: α-Hydroxysuccinyl-ω-hydroxysuccinyloxypoly(oxyethylene)s (succinic half-esters of poly-(ethylene glycol)s) (2) of different molecular weights were prepared, and transformed into the corresponding benzotriazole and imidazole derivatives 3 and 4. The benzotriazolyl or the imidazolyl residues in these polymers can easily be exchanged. This was proved with model compounds bearing hydroxyl or amino groups. Polymers of this type may be considered as potential oligomeric drug-binding matrices.

Process for inhibiting the corrosion of aluminum

Abstract: Corrosion inhibited alcohol compositions can be prepared which are suitable for use as anti-freeze compositions in the cooling systems of internal combustion engines. The alcohol is selected from at least one of the group consisting of methanol, ethanol, propanol, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol and glycerol. The corrosion inhibitor comprises an effective amount of a conventional corrosion inhibitor selected from the group consisting of the alkali metal carbonates, borax, the alkali metal dichromates, the alkali metal silicates, phosphorous acid, phosphoric acid, an alkali metal tungstate, benzotriazole, tolyltriazole, an alkali metal salt of benzoic or toluic acid, an alkali metal salt of a phenol, an alkanolamine and an organo-silicone compound in addition to an alkanolamine phosphate and a heterocyclic nitrogen-containing compound. The phosphate is the reaction product of an alkanolamine and phosphoric acid. The heterocyclic nitrogen-containing compound has the formula: ##STR1##

Effect of Substituted Benzotriazoles on the Anodic Dissolution of Iron in H2SO4

Abstract: The kinetics of iron corrosion in deoxygenated 0.5M H2SO4 containing either unsubstituted benzotriazole or its 5-substituted derivatives, BTA-CH3 (TTA), BTA-NH2, BTA-NO2, BTA-Cl, and BTA-COOH have been investigated. At 0.1 mM and 2 hours immersion of iron, a simple adsorption mode of the inhibitors is indicated during anodic dissolution. At higher concentrations and at both 2 hours and 24 hours immersion, interaction of the inhibitor and a surface reaction intermediate during anodic dissolution is indicated. During cathodic polarization (i.e., hydrogen evolution reaction), the results show simple adsorption of the inhibitors at all of the above conditions. Correlations of the corrosion rates of inhibited iron and Hammett substituent constants have been obtained. Greater inhibition is obtained with electron-withdrawing substituents than with electron-providing substituents.

High caustic coupling process for preparing substituted 2-nitro-2'-hydroxyazobenzenes

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° C. and +30° C. The o-nitroazobenzenes obtained are intermediate products useful in the manufacture of benzotriazole UV absorbers.

Adsorption Isotherm for the Copper-Benzotnazole System

Abstract: An appropriate adsorption isotherm for the adsorption of benzotriazole on to copper surfaces from ammonium chloride solutions is presented. The analysis, which has taken into account the relative size factor, leads to the appropriate isotherm being that due to Frumkin. Some thermodynamic parameters of the adsorption isotherm are thus evaluated.

Effects of Substituted Benzotriazoles on the Electrochemical Behavior of Copper in H2SO4

Abstract: Rates of anodic dissolution of copper as well as hydrogen evolution in H2SO4 containing substituted benzotriazoles have been examined. The aromatic ring-substituted benzotriazoles studied were: 5-NH2, 5-NO2. 5-CH3, 5-Cl, 5-C00H, a mixture of 4-C00H and 5-COOH, and the unsubstituted benzotriazole (BTA). The anodic polarization results indicate that BTA-NH2, BTA-COOH and BTA-Cl inhibit copper electrodissolution by surface blockage, with the bare copper surface oxidizing to Cu(II) as the uninhibited metal. In the presence of the other benzotriazoles, copper apparently oxidizes to Cu(I) by forming slightly soluble organo-Cu(I) complexes as the oxidation product. As reported previously by others, copper electrooxidizes to cuprous chloride complexes in the presence of chloride ions (0.1M). None of the benzotriazoles had any effect on the anodic dissolution of copper in the acidic chloride solutions below zero volts vs SCE. On the other hand, at higher potentials where a current plateau was obtained, as...

Benzotriazole compound and homopolymer or copolymers thereof

Abstract: Benzotriazole compounds having the formula ##STR1## wherein A represents a hydrogen atom or an acetyl group; R1 represents vinyl, ethyl or a haloethyl group; R2 represents a C1-4 alkyl group and n is 1 or 2. The R2 2 groups need not be identical and a homopolymer or copolymers thereof which are effective as an ultraviolet absorber.

The effectiveness of benzotriazole in the inhibition of the corrosive behaviour of stripping reagents on bronzes

Abstract: The effectiveness of benzotriazole in reducing the corrosive behaviour of alkaline Rochelle salt, alkaline glycerol, Calgon, and citric acid on exposed tin-bronze surfaces was studied to determine a safe procedure to utilize these stripping agents. Test pieces of modern metal were immersed in the reagents using two different treatment methods. The effect of benzotriazole was observed by metallographic techniques. The method of pretreatment of the samples with benzotriazole before immersion in the stripping reagents gave successful corrosion inhibition only for the samples in Calgon. The method of direct addition of benzotriazole to the reagent was found to be most effective for the Calgon solution, less effective for the alkaline Rochelle salt and alkaline glycerol and not effective for the citric acid solution.

New synthesis of benzotriazole photostabilizers

Abstract: 1-(2-Nitrophenyl)-5-aryltetrazoles and 1-aryl-5(2nitropheny1)tetrazoles are converted into 2-arylbenzotriazoles by the action of heat, the former reacting much faster than the latter. By appropriate use of methoxyl groups, useful benzotriazole ultraviolet absorbers may be synthesized conveniently by this method.

Corrosion preventing method for metals in system using calcium chloride brine

Abstract: PURPOSE:To effectively prevent the corrosion of metals such as iron contacting with calcium chloride brine by adding one or more kinds of compounds selected from sugar, its analogous compounds and starches to the brine together with an azole compound. CONSTITUTION:The calcium chloride brine are added one or more kinds of compounds selected from sugar such as glucose, its analogous compounds such as methylose, starch and its hydrolyzates such as low molecular dextrin together with an azole compound such as benzotriazole by small amount. The concn. of the chemicals added is preferably 50-5,000ppm as a whole, and the wt. ratio of the azole compound to the former compounds 1:10-10:1. Thus, only by combining the above- mentioned compounds each having high solubility to the brine and adding them to the brine by a very small amount, superior corrosion preventing property to copper as weell as iron is shown.

Agricultural vinyl chloride resin film having excellent weather resistance

Abstract: PURPOSE: The titled film which shows resistance to discoloration and embrittlement, etc. when spread outdoors, prepared by adding a benzophenone type or benzotriazole type ultraviolet ray absorber and a hindered amine compound. CONSTITUTION: A vinyl chloride resin (A) is mixed with (B) a benzophenone type ultraviolet ray absorber (e.g., 2,4-hydroxybenzophenone) or a benzotriazole type ultraviolet ray absorber[e.g., 2-(2'-hydroxy-5'-methylphenyl)benzotriazole]and (C) a hindered amine compound of the formula, wherein R 1W4 are each a 1W4 C alkyl, n is 1W4 and R is a mono- to tetracyl group derived from a mono- to tetrabasic carboxylic acid (e.g., 4'-acetoxy-2,2,6,6-tetramethylpiperidine). The mixing ratio is such that 0.02W8pts.wt. sum of components B and C is present per 100pts.wt. component A. It is possible to obtain agricultural vinyl chloride resin films excellent in weather resistance which do not undergo undesirable degradation such as discoloration and embrittlement when spread outdoors. COPYRIGHT: (C)1982,JPO&Japio

Developing method for photosensitive silver halide material

Abstract: PURPOSE: To carry out the rapid development of a sensitive material using a surface latent image type silver halide emulsion and a silver halide emulsion having internal fogging nuclei by developing the material with a developer contg a specified indazole compound or a specified benzotriazole compound and a solvent for silver halide CONSTITUTION: A developer contg an indazole compound represented by formulaI(where R 1 is H, NO 2 , CN or halogen) or a benzotriazole compound represented by formula II (where R 2 is H, halogen or alkyl) is prepared The developer is used in the development of a photosensitive material having a layer of a mixture of a surface latent image type silver halide emulsion with a silver halide emulsion having internal fogging nuclei or a sensitive material having superposed layers of said separate emulsions Thus, a high contrast image with high sensitivity and high covering power is rapidly obtd without deteriorating the graininess and fog Even in case of a silver saving sensitive material, a superior image is similarly obtd COPYRIGHT: (C)1983,JPO&Japio

Photo-oxidation of 1,3-dimethylpyrazolo[1,2-α]benzotriazole

Abstract: The dye-sensitized photo-oxidation of the title mesomeric betaine yields two pairs of epoxy-ketones and α,β-unsaturated ketones, formally arising from addition of singlet oxygen to its two 1,3-dipolar mesomeric forms (2a) and (2b); in methanol stable methoxy-hydroperoxides are obtained.

Anticorrosive agent for metal

Abstract: PURPOSE:To raise the anticorrosive effect on metals, solubility in water, and stability after being dissolved in water of an anticorrosive agent for metals and widen its applicability to metals, by using as an effective component a reaction product between a benzotriazole and an organic diphosphonic acid CONSTITUTION:A benzotriazole of formula I (where R1 is methyl or ethyl group and n is 0 or 1) is reacted with an organic diphosphonic acid of formula II (where R1 is H or 1-12C alkyl and X is H or OH) with stirring either by heating or in an adequate solvent, eg, water, and the reaction product thus obtained is used as an effective component for an anticorrosive agent for metals The anticorrosive agent exhibits an effective anticorrosive effect on a wide variety of metals, eg, Cu, Cu alloys, Al, Fe, Zn, etc

Benzotriazole-sulfurized olefin compositions and lubricants and concentrates containing them

Abstract: BENZOTRIAZOLE-SULFURIZED OLEFIN COMPOSITIONS AND LUBRICANTS AND CONCENTRATES CONTAINING THEM Abstract Compositions comprising (A) at least one benzo-triazole or reaction product thereof with an aliphatic amine and (B) a sulfurization product of at least one aliphatic or alicyclic olefinic compound are useful in lubricants, espe-cially gear lubricants, as additives capable of affording long-lasting extreme pressure properties and antiwear capability and having relative inertness to copper parts. Component A is preferably benzotriazole or tolyltriazole, and component B is preferably the reaction product of a sulfur-hydrogen sulfide mixture with propene, isobutene, or a dimer, trimer or tetramer thereof.

Anticorrosive for metal

Abstract: PURPOSE:To remarkably enhance the discoloration and corrosion resistance effects on metal by adding an ultraviolet absorber and an org. titanium compound to various kinds of solvents or vehicles. CONSTITUTION:To various kinds of solvents or vehicles are added one or more kinds of ultraviolet absorbers such as hydroxybenzophenone, benzotriazole and salicylic acid ester and one or more kinds of org. titanium compounds such as alkyltitanium, aryltitanium and alkoxytitanium.

Low-friction lubricating oil

Abstract: PURPOSE:The titled lubricating oil for a variety of sliding bearings, excellent in frictional characteristics and seizing resistance, which is prepared by incorporating a specified benzotriazole deriv. and a partially exterified alkenyl succinate in refined mineral oil. CONSTITUTION:0.001-10wt% (based on the total composition to be prepared) Benzotriazole deriv. of formula I [wherein R1 and R2 are each a 10-20C alkyl group (e.g., octadecyl) having substantially no branched structure or a 10-20C straight-chain alkenyl group (e.g., octadecenyl)] and 0.001-10wt% (basd on the total composition to be prepared) partially esterified alkenyl succinate of formula II [wherein R3 is an alkenyl group derived from a 10-20C straight-chain alpha-olefin; X is a 2-20C ester residue (e.g., an ester residue derived from ethylene glycol) having an OH group] are compounded with refined mineral oil of kinematic viscosity 10-10,000 cst at 40 deg.C and viscosity index >=80.

Ultraviolet light shielding tube for photochemical reaction

Abstract: PURPOSE:To obtain a light transmitting tube having improved impact resistance, ultraviolet light shielding property and durability with reduced diameter and wall thickness of the tube, by incorporating a benzotiazole compound with polymethyl methacrylate CONSTITUTION:005-20wt%, Preferably 025-20wt% from the standpoint of the durability, 2-phenyl-benzotriazole compound expressed by the formula [R1 is CH3 or C(CH3)3; R2 is H, CH3 or C(CH3)3; X is H or Cl], eg 2-(2'-hydroxy-5'- methyl-phenyl)benzotriazole, is incorporated with polymethyl methacrylate The process is preferably carried out by adding the compound to a preliminarily polymerized polymethyl methacrylate, and cast polymerizing th resultant mixture The average polymerization degree of the polymer is >=7,000

Rust preventing resin composition

Abstract: PURPOSE:The titled composition, containing an amine addition salt of benzotriazole and an unsaturated resin composition having >C=C C=C< groups, e.g. a mixture of 20-70wt% base resin such as an unsaturated polyester resin with 80- 30wt% polymerizable monomer such as styrene, is incoporated with 0.01-5.0wt%, preferably 0.05-3.0wt%, addition salt obtained from a benzotriazole or a derivative thereof and an amine, e.g. a compound expressed by the formula (R1, R2, R3 and R4 are H, halogen, nitro, sulfone, hydroxyl, carboxyl or phenyl; R5, R6 and R7 are lower alkyl or lowe alkanol).

Rust preventive and its manufacture

Abstract: PURPOSE:To obtain an innoxious rust preventive effective against various kinds of metals by using oligostarch higher fatty acid ester represented by a specified general formula or the ester and one or more among silicate, benzotriazole, mercaptobenzothiazole salt, etc. CONSTITUTION:Oligostarch higher fatty acid ester represented by the general formula is used as a rust preventive. To the ester may be added one or more among silicate, benzotriazole, mercaptobenzothiazole salt, alkanolamine and sodium nitrite. In the formula, each of X1 and X3 is H or acyl having 5-19C aliphatic hydrocarbon chain, the ratio of acyl is 0.01-0.5 per three free OH groups in each glucose unit on an average, and n is 2-40 on an average. This ester is manufactured by reacting oligostarch and higher fatty acid ester at <= about 70 deg.C in the presence of lithium hydroxide.

New synthesis of benzotriazole photostabilizers

Abstract: 1-(2-Nitrophenyl)-5-aryltetrazoles and 1-aryl-5(2nitropheny1)tetrazoles are converted into 2-arylbenzotriazoles by the action of heat, the former reacting much faster than the latter. By appropriate use of methoxyl groups, useful benzotriazole ultraviolet absorbers may be synthesized conveniently by this method.

Protection of copper surface

Abstract: PURPOSE:To enable the excellent protection of the copper surface compared to a conventional process by a method wherein the copper surface is polished by an aqueous solution containing a specific amount of benzotriazole dissolved therein to form a copper.benzotriazole coating thereon. CONSTITUTION:In a protecting system of the copper surface, the copper surface is polished by a polishing agent such as a cleanser by using the aqueous solution containing 0.2% or more of benzotriazole dissolved therein to easily form the copper. benzotriazole coating on the copper surface. Thereafter, the copper surface is subjected to the clear painting and used. By this method, the excellent protection of the copper surface can be carried out in an extremely simple manner compared to a conventional method.