13 results about "Nitroxyl radicals" patented technology

Provided is a polarizing plate in which the decrease in transmittance in a high-temperature environment is suppressed. A polarizing plate has a polarizing element in which a dichroic dye is adsorbed and oriented in a polyvinyl alcohol-based resin layer, a first transparent protective film laminated on one face of the polarizing element, and a second transparent protective film laminated on the other face of the polarizing element, the polarizing element and the transparent protective films being bonded with a first adhesive layer formed from a first adhesive containing a first compound, the polarizing element and the second transparent protective film being bonded with a second adhesive layer formed from a second adhesive containing a second compound, the first compound being at least one selected from the group consisting of urea, a urea derivative, thiourea, and a thiourea derivative, and the second compound being a compound having a nitroxyl radical or a nitroxide radical.

The object of the invention is a nitroxyl polyphenol derivative of formula:wherein Q is a group derived from a polyphenol;L is an ester linking group containing 1 to 3 carbon atoms;A is a 5- or 6-membered heterocyclic group containing one nitrogen atom which is in the form of nitroxyl radical (NO·), in which both carbon atoms adjacent to the nitroxyl radical are substituted independently of each other with one or two C1-C3 alkyl groups; andn is an integer of 1 to 5.The object of the invention is also methods for the preparation of the above-defined derivative and a use thereof as an antioxidant agent, in particular an antiaging agent.

A photosensitive resin composition for a permanent resist according to the present disclosure includes (A) an acid-modified vinyl group-containing resin, (B) a photopolymerizable compound, (C) a thermosetting resin, (D) an inorganic filler, (E) a photopolymerization initiator, and (F) a polymerization inhibitor, wherein (F) the polymerization inhibitor contains a nitroxyl radical compound, and the content of the nitroxyl radical compound is 0.015-0.40 pt.mass with respect to 100 pts.mass of the total amount of (A) the acid-modified vinyl group-containing resin, (B) the photopolymerizable compound, and (C) the thermosetting resin.

The present application provides a kind of high-efficiency polymerization inhibitor for styrene rectification, by weight parts, including following each component: 20-40 parts of radical scavenger, 15-25 parts of modified alkylamine and 50-100 parts of composite alcohol solution, 2-4 parts of sodium citrate and 1-3 parts of sodium oxalate;The radical scavenger is porous calcium carbonate microspheres loaded with nitroxyl radical and plant extract;The modified alkylamine is layered double hydroxide LDH loaded with alkylamine;The composite alcohol solution is ethylene glycol, glycerol and polyvinyl alcohol;It is applied to styrene rectification, and the polymerization inhibition capacity is obviously improved by efficient capture of free radical.

A photosensitive resin composition comprising (A) an alkali-soluble polymer, (B) a compound having an ethylenically unsaturated bond, (C) a photoinitiator, (D) a sensitizer, and (E) polymerization inhibitors, wherein (C) the photoinitiator includes one or more selected from a 2,4,5-triallyl imidazole dimer and an acridine compound, the contained amount of (C) the photoinitiator is 5.0 mass% or more with respect to the total mass of solid content of the photosensitive resin composition, (D) the sensitizer contains a specific compound represented by the compound described by formula (D1-1), and (E) the polymerization inhibitors include (E1) a first polymerization inhibitor selected from nitroso compounds and nitroxyl radicals and (E2) a second polymerization inhibitor other than the first polymerization inhibitor.

The present application relates to the chemical technology field, specifically to a kind of preparation method of high-purity o-vanillin.The method uses o-methoxyphenylamine as starting material, with chloral hydrate and hydroxylamine hydrochloride is condensed, hydroxylamine oximation reaction, and cyclization reaction is carried out under strong acid condition, and compound 2 is generated;Compound 2 is oxidized under strong base condition, and compound 3 is generated;Compound 3 is esterified with primary alcohol to generate corresponding ester, and then reduction hydrogenation reaction is carried out under the action of strong reducing agent, and compound 4 is generated;Compound 4 is reacted with oxidizing agent in the presence of nitroxyl radical catalyst, and compound 5 is generated;Compound 5 carries out diazotization hydrolysis reaction, and o-vanillin is generated.The method avoids the problem of regioselectivity of traditional formylation reaction through specific reaction sequence, eliminates the generation of isomer impurities from the source, realizes the efficient, environmentally friendly, economic synthesis of high-purity o-vanillin, and provides high-quality raw material guarantee for downstream pharmaceutical.

Ionic cyclic nitroxyl radical oligomers, methods of making the ionic cyclic nitroxyl radical oligomers, and electrochemical cells, such as aqueous organic redox flow batteries (AORFBs) that use the ionic nitroxyl radical oligomers as catholytes are provided. The oligomers are larger than individual cyclic nitroxyl radical molecules, but maintain a high density nitroxyl radical groups within the molecule. As a result, when the oligomers are used as catholytes in an AORFB, they are able to reduce catholyte permeation through the ion-conducting membrane, while providing a high volumetric capacity and cycling stability.

The present invention provides a composition for a holographic recording medium, the composition being capable of suppressing generation of a colored body or a light-emitting body that is derived from an oxime ester photopolymerization initiator and effectively suppressing undesirable phenomena such as loss of light and color change of a display image without greatly lowering hologram characteristics. Disclosed is a composition for a holographic recording medium, which contains the following components (a) to (f).　Component (a): an isocyanate compound which does not contain an aromatic ring or a methacrylate group; Component (b): a polycaprolactone polyol; Component (c): an acrylate monomer; Component (d): an oxime ester photopolymerization initiator; Component (e): a compound which has a nitroxyl radical group and an isocyanate-reactive functional group; Component (f): a compound which has an isocyanate group and a methacrylate group, or a compound which has an isocyanate-reactive functional group and a methacrylate group

There is provided a redox flow battery (1) comprising a negative electrolyte solution (2) and a positive electrolyte solution (3) wherein the negative electrolyte solution (2) comprises an optionally modified naphthalene diimide, NDI, or a salt thereof, and the positive electrolyte solution (3) comprises a cyclic nitroxyl radical derivative having at least two cyclic nitroxyl radical groups, or a salt thereof.

The application relates to a cross-linked polyethylene composition for manufacturing a medium and high voltage cable insulator, a cross-linked polyethylene material, a preparation method thereof and a medium and high voltage cable. The cross-linked polyethylene composition comprises the following components in parts by weight: 90-98 parts of polyethylene, 1-3 parts of a peroxide cross-linking agent, 0.05-1 part of a hindered phenolic antioxidant and 0.05-1 part of a piperidine nitroxyl radical polymerization inhibitor. The cross-linked polyethylene composition can improve the scorch resistance and long-term thermal stability of the existing medium and high voltage cable insulator.

Ionic cyclic nitroxyl radical oligomers, methods of making the ionic cyclic nitroxyl radical oligomers, and electrochemical cells, such as aqueous organic redox flow batteries (AORFBs) that use the ionic nitroxyl radical oligomers as catholytes are provided. The oligomers are larger than individual cyclic nitroxyl radical molecules, but maintain a high density nitroxyl radical groups within the molecule. As a result, when the oligomers are used as catholytes in an AORFB, they are able to reduce catholyte permeation through the ion-conducting membrane, while providing a high volumetric capacity and cycling stability.

The application relates to a preparation method of terephthalate-glycolate monomers and a preparation method of degradable polyesters, wherein the preparation method of the terephthalate-glycolate monomers comprises the following steps: mixing esterification, a nitroxyl radical type catalyst, water and an organic solvent in a reaction device, then filling NO / NO2 mixed gas and oxygen-containing gas into the reaction device to perform an oxidation reaction, and after the reaction is completed, the terephthalate-glycolate monomer shown in formula (2) is obtained through cooling and separation. Through the synergistic catalysis of the nitroxyl radical type catalyst and the NO / NO2 mixed gas, the structural unit of glycolic acid can be effectively introduced into the polyester monomer, the method has high conversion rate, selectivity and stability, the process is safe and reliable; meanwhile, after the reaction is completed, the terephthalate-glycolate monomer is precipitated from the reaction solution in the cooling process, and is easy to purify and separate.

The invention discloses a compound polymerization inhibitor which is composed of one of the following three component combinations and a solvent water, and the combination comprises a compound I, namely a component A and a component B; the compound type II comprises a component A and a component C; the compound III comprises a component A, a component B and a component C; the component A is a nitroxide free radical heterocyclic compound, the component B is a reducing agent compound, the component C is a phenol polymerization inhibitor, and the solvent is water. Compared with the prior art, the compound polymerization inhibitor has the advantages that after a certain amount of reducing agent compounds or phenol polymerization inhibitors are added into the nitroxide free radical heterocyclic compounds or are added at the same time, the compound polymerization inhibitor has an obvious inhibiting effect on self-polymerization and decomposition of the nitroxide free radical heterocyclic compounds, and has a synergistic effect in the use process; the product provided by the invention has the advantages of better polymerization inhibition effect, better stability at high temperature and wider application range.