Showing papers on "Benzotriazole published in 1987"

The chemistry of N-substituted benzotriazoles. Part 1.1-(Chloromethyl)benzotriazole

Abstract: The N-chloromethyl group of 1-(chloromethyl)benzotriazole undergoes nucleophilic substitution by carbon, nitrogen, phosphorus, oxygen, and sulphur nucleophiles. α-Lithiation was achieved in high yield in 1-phenylthiomethyl-, 1-phenylsulphinylmethyl-, and 1-(phenylstilphonylmethyl)benzotriazoles and the lithio derivatives reacted with a variety of electrophiles. New benzotriazolium salts were prepared by quaternization of the N-3 nitrogen with methyl iodide.

The chemistry of benzotriazole. Part 3. The aminoalkylation of benzotriazole

Abstract: 1-(1-Hydroxyalkyl)benzotriazoles convert a wide variety of aromatic and heteroaromatic primary amines into their mono N-[1-(benzotriazol-1-yl)alkyl] derivatives in high yield. Aliphatic primary amines frequently give bis-derivatives. Product structure is established by 13C n.m.r.; dangers in the use of 1H n.m.r. to distinguish 1- and 2-substituted benzotriazoles are pointed out.

The chemistry of N-substituted benzotriazoles. Part 5. Reactions of benzotriazole with aldehydes and thionyl chloride—formation of (benzotriazol-1-yl)-1-chloroalkanes and bis(benzotriazolyl)alkanes

Abstract: Reaction of benzotriazole with an excess of aliphatic aldehydes and thionyl chloride in refluxing chloroform gives the corresponding 1-(benzotriazol-1-yl)-1-chloroalkanes. Products with an α-hydrogen next to the chlorine-bearing carbon atom gradually eliminate hydrogen chloride with time or when heated. Nucleophilic displacements of the chlorine atom are described. Reaction of 2 mol equiv. of benzotriazole with 1 mol equiv. of aromatic or aliphatic aldehydes and an excess of thionyl chloride yields the corresponding bis(benzotriazol-1-yl)methylarenes and 1,1-bis(benzotriazol-1-yl)alkanes respectively; usually some of the corresponding 1-(benzotriazol-1-yl)-1-(benzotriazol-2-yl)alkanes are also formed. The 1-(benzotriazol-1-yl)-1-chloro-1-arylmethanes spontaneously react further to give bisbenzotriazolyl compounds.

The chemistry of N-substituted benzotriazoles. Part 7. The isomeric composition and mechanism of interconversion of some N-(aminomethyl)benzotriazole derivatives

Abstract: A variety of N-(dialkylaminomethyl)benzotriazoles are shown by 1H and 13C n.m.r., i.r., and X-ray crystallography to exist solely in the 1-substituted form in the crystalline phase, but as an equilibrium mixture of the 1- and 2-isomers in the liquid, melt, solution and argon matrix phases. The 1- and 2-isomers equilibrate by an intermolecular mechanism as proven by cross-over experiments.

The chemistry of N-substituted benzotriazoles. Part 4. A novel and versatile method for the mono-N-alkylation of aromatic and heteroaromatic amines

Abstract: Mono-N-alkylation of aromatic and heteroaromatic amines is achieved in high yield by NaBH4 reduction of the adducts formed from benzotriazole, aliphatic aldehydes and the amines. Reaction of the same adducts with Grignard reagents gives N-(secondary alkyl)arylamines. Carboxy groups need no protection and nitro groups are unaffected. Adenine is mono-N-alkylated in high yield.

Inhibiting Action of Benzotriazole on Copper Corrosion in Deaerated Sulfuric Acid Containing Ferric Ions by the Rotating Disc Electrode, Fluorescence, and Raman Spectroscopies

Abstract: The rate of copper corrosion by ferric ions (∼7 mM) in 0.5 M deaerated sulfuric acid in the presence and absence of benzotriazole (BTAH) has been studied. The rotating disk electrode (RDE) has been used in weight loss experiments. In the range of BTAH concentrations between 0 and 3.0×10−4 M, the Levich equation is obeyed; i.e., the process is still controlled by transport of ferric ions to the electrode surface. Total inhibition of the corrosion process is observed when the BTAH concentration equals 5.0×10−3 M. The protective film follows a Langmuir adsorption isotherm, with an adsorption constant of 8.8×103 M−1. The chemical nature of the passivating film formed on the copper surface in this medium has been studied by in situ and ex situ fluorescence and Raman spectroscopies and the surface film characterized as a polymeric [Cu(I)BTA] complex.

Composition useful as corrosion inhibitor, anti-scalant and continuous biocide for water cooling towers and method of use

Abstract: An all-in-one treatment composition for a water cooling tower includes a water soluble aromatic azole corrosion inhibitor such as benzotriazole, an organophosphorous antiscalant and a polymeric quaternary ammonium compound. The polymeric quaternary ammonium compound has the following general formula: ##STR1## The composition is suitable for use at low level continuous applications rates. The polymeric quaternary ammonium compound is also suitable for use at low concentration as a continuous biocide/biostat. This compound does not suffer from the acclimatization typically encountered when one biocide is used on a continuous low level basis.

The chemistry of N-substituted benzotriazoles. Part 2. Reactions of benzotriazole with aldehydes and aldehyde derivatives. 1-(α-Hydroxyalkyl)-, 1-(α-alkoxyalkyl)-, and 1-(α-acyloxyalkyl)benzotriazoles

Abstract: Benzotriazole reacts readily with a variety of aldehydes to yield crystalline 1:1 adducts characterized by strong hydrogen bonding. Corresponding 1-(α-alkoxyalkyl)benzotriazoles are formed in the presence of alcohols, and 1-(α-acetoxyalkyl) analogues result from aldehyde diacetoxy derivatives. The products of more complex reactions between benzotriazoles and unsaturated aldehydes are elucidated.

UV-stabilized coatings

Abstract: Novel coating compositions contain a radiation polymerizable acrylic monomer or oligomer and an ultraviolight-light absorbing effective amount of a UV-absorbing multimeric benzotriazole compound

Magnetic recording medium

Abstract: PURPOSE:To make a plastic case, reel, etc., hardly colorable by a tilted medium by incorporating a specific benzotriazole deriv. into a magnetic layer. CONSTITUTION:This magnetic recording medium is constituted of a nonmagnetic base such as polyester film and the magnetic layer which is formed thereon and consists essentially of ferromagnetic powder such as gamma-Fe2O3 and binder contg. nitrocellulose and contains the benzotriazole deriv. expressed by the formula therein. In the formula, X, Y denote an alkyl of 1-4C, Cl, Br; n1, n2 denote 0-4. The coloration of the plastic case, reel, label or packaging paper is decreased if such deriv. is incorporated into the magnetic layer.

Photopolymerizable composition containing carboxy benzotriazole

Abstract: Improved adhesion to a substrate is obtained employing a photopolymerizable composition containing a carboxy benzotriazole.

Passivating process for surface of copper and its alloy

Abstract: This invention is characterized by: (1) dilute chromic acid treatment is performed after bright acid dipping (polishing) procedure; (2) the concn. of oxalic acid polishing solution is doubled; besides, a phosphoric acid polishing solution which offers very high polishing efficiency is provided; (3) passivation film-forming (treatment) is the combined treatment by a mixt. of benzotriazole and polyvinyl alcohal. It is a passivating technology providing ideal protective films with neither polluting environment nor impairing operator's health.

Positive photosensitive o-quinone diazide composition with benzotriazole carboxylic acid or alkyl ester

Abstract: A positive type photosensitive composition capable of improving the drawback in the conventional positive type photosensitive resin composition, improving adhesion between the positive type photoresist and the substrate and improving developability is provided by incorporating benzotriazole carboxylic acids in the positive type photoresist.

Antibacterial resin composition

Abstract: PURPOSE: To obtain the subject antibacterial resin composition excellent in long-acting properties of its antibacterial action and having high stability to acids, bases, light and heat by blending a UV absorber with an antibacterial hydrated oxide obtained by substitution of a hydrated oxide having an ion- exchange capacity with silver ions. CONSTITUTION: (A) An ion-exchangeable hydrated oxide, preferably an antibacterial hydrated oxide obtained by substituting a part or all of ion-exchangeable ions of a compound selected from titanium, tin, zirconium, antimony and aluminum with silver ions and containing 1-10wt.% silver ion is blended with (B) a UV absorber such as a benzophenone compound, a benzotriazole compound, a salicylic acid compound or a cyanoacrylate compound so that the content in the resin composition may be (A)=0.5-10wt.%, preferably 0.5-2.5wt.% and (B)=0.001-1.0wt.%. As the content of silver ion in the above-mentioned composition, a range of 0.005-0.1wt.% is suitable. COPYRIGHT: (C)1991,JPO&Japio

Stabilizer for thermosetting synthetic resin paint

Abstract: PURPOSE: To obtain a stabilizer which can stabilize a paint film for a long time and scarcely colors it, by using a specified benzotriazole compound as a component. CONSTITUTION: A stabilizer comprising a benzotriazole of formula I (where R is H or methyl and X is formula II). Examples of the compounds of formula I include [2-hydroxy-3-(acryloylaminomethyl)-5-methylphenyl]benzotriazole and [2-hydroxy-3-t-butyl-5-(methacryloyhloxyethy)phenyl]benzotriazole. The amount of this benzotriazole compound used is usually about 0.01W10wt.%, based on the resin component (solid matter) in a paint. When this amount is below 0.01wt.% the stability of a paint film is not sufficient, and when this amount is above 10wt.% the stability cannot be improved so much as to corresponding to the amount of use and the properties of a paint film are adversely affected in some extreme cases. COPYRIGHT: (C)1988,JPO&Japio

Thermal transfer recording sheet

Abstract: PURPOSE:To make it possible to obtain a hard copy with high color-fastness to light of recorded images and with little fading even under long-time preservation, by incorporating a 2-(2'-hydroxyphenyl)benzotriazole compound which is liquid at normal temperature. CONSTITUTION:A dye transferred from a thermal transfer sheet comprising a heat-fusible or heat-sublimable dye and a 2-(2'-hydroxyphenyl)benzotriazole compound being liquid at normal temperature are contained. The 2-(2'- hydroxyphenyl)benzotriazole compound is added by dispersing or dissolving it in a dye composition for forming a receiving layer, then the composition is applied to a base sheet, and is dried, whereby the compound can be incorporated in the receiving layer. Alternatively, the compound may be incorporated in a thermal transfer layer so as to be transferred to a thermal transfer recording sheet simultaneously with or after the transfer of the dye. The thermal transfer recording sheet may be provided with a receiving layer. The receiving layer has the function of receiving the sublimable dye transferred from the thermal transfer sheet at the time of printing, thereby permitting dyeing with the sublimable dye, and is preferably a coated film comprising a synthetic resin and having a thickness of 3-50mum.

Process for UV stabilizer impregnation of plastic surfaces

Abstract: A process of producing a thermoplastic article having resistance to degradation by ultraviolet radiation, which comprises impregnating the surface of the thermoplastic article with a UV-absorbing effective amount of a solution of a multimeric benzotriazole compound at a surface impregnation effective elevated temperature.

Acid-curable thermoset enamels containing a triazole

Abstract: Acid-curable thermoset enamel compositions coming in contact with copper or copper-containing alloys are discolored and degrade more rapidly due to leaching of copper into the compositions. The presence of small amounts of benzotriazole or tolutriazole effectively prevents the discoloration and concomitantly retards degradation.

Photopolymerizable composition including benzotriazole carboxylic acid

Abstract: The composition of this invention comprises: (a) a thermoplastic organic polymer, (b) a non-gaseous ethylenically unsaturated compound containing at least two terminal ethylenic groups capable of forming a polymer by photoinitiated addition polymerization, (c) an addition polymerization initiator activatable by actinic radiation, and (d) a benzotriazole carboxylic acid.

Photophysics of a sulfonated 2‐hydroxyphenylbenzotriazole UV absorber in solution and in polymer substrates

Abstract: The total absorption spectrum of the UV absorber sodium 2-(2′-hydroxy-5′-methylphenyl) benzotriazole sulfonate (TINS) has been resolved into contributions by two ground-state forms in acetonitrile-water solvent mixtures and hydrogen bonding polymer and protein substrates. These two ground-state species can be assigned to (i) a planar intramolecularly hydrogen bonded form which can undergo the efficient nonradiative energy dissipation process of excited-state intramolecular proton transfer (ESIPT), and (ii) a fluorescent nonplanar species in which ESIPT is effectively prevented. The mole fractions of each contributing conformer in the polymeric substrates have been estimated. In all the polymer systems studied, a significant proportion of the TINS molecules exist in the nonplanar form and thus may not contribute to photostabilization of the substrate. The proportion of nonplanar molecules varied from 11 to 86% in synthetic polymers and 20 to 41% in protein substrates.

Ultra violet light resistant carbonate polymers with improved processing stability

Abstract: Ultra violet light resistant polycarbonates are produced having processing or heat stability by adding compatible UV absorbing compounds and aromatic sulfonimides. The UV absorbing compounds are used in amounts from about 0.01 to about 5.0% by weight and the sulfonimides are used in an amount from about 0.0001 to about 10.0%. The preferred UV absorber is 2-(2'-hydroxy-5'-t-octylphenyl)-benzotriazole. The preferred sulfonimide is N-(p-tolylsulfonyl)-p-toluenesulfonimide.

Photoresist compositions with a bis-benzotriazole

Abstract: Photoresist compositions which operate positively and contain at least one ocmpound of the formula I ##STR1## in which X is --Cn H2n --, --O--, --S-- or --C(O)--, n being a number from 1 to 6. These compositions are particularly suitable for use as positively-operating copying lacquers.

New 1-sulphonyl:oxyl-6-tri:fluoromethyl-benzotriazole derivs. - useful as coupling agents in prodn. of 7-oxy:imino-acetamido-cephalosporin cpds.

Abstract: Benzotriazolyl-sulphonates of formula (III) and syn-isomers of benzotriazolyl-carboxylates of formula (V) are new. In the formulae, R4=Me or p-tolyl; R=furyl, thiazolyl or thiadiazolyl; R1=up to 6C alkyl, alkenyl, alkynyl or cycloalkyl. USE/ADVANTAGE - (III) are coupling agents in synthesis of syn-isomers of oximino-acetamido cephem derivs. (I). They are more reactive than known agents derived from 1-hydroxy-1H-benzotraizole; are inexpensive, stable and easy to handle, and the acylation of the 7-aminocephem reaction is carried out within 1 hr. without protection of the amino gp..

UV-stabilized melamine-polyol coated thermoplastic substrate

Abstract: Coated article has a thermoplastic substrate and a surface coating of a transparent ultraviolet light-resistant polymer which is the reaction product of a melamine compound, a polyol, and a multimeric benzotriazole compound. The coating of the coated article retains its UV absorbance during curing and exposure to elevated temperatures.