172 results about "Nitroso Compounds" patented technology

A C-nitroso compound having a molecular weight ranging from about 225 to about 1,000 (from about 225 to about 600 for oral administration) on a monomeric basis wherein a nitroso group is attached to a tertiary carbon, which is obtained by nitrosylation of a carbon acid having a pKa less than about 25, is useful as an NO donor. In another case, the C-nitroso compound contains the moiety

—C—N(O)X—

where X is S, O or NR. One embodiment is directed to COX-2 inhibitors where a tertiary carbon atom and/or an oxygen atom and/or a sulfur atom is nitrosylated.

Sports equipment incorporate thermoplastic compositions including urethane and a nitroso reaction product of a nitroso compound and a diisocyanate or polyisocyanate. The invention allows for the processing advantages of a thermoplastic urethane with the superior performance characteristics of a cross-linked polyurethane.

The invention concerns a reagent system for the so-called on-board control of analytical elements, in particular test strips, containing an organic N-oxide or a nitroso compound. The invention also concerns analytical elements containing a reagent system for a detection reaction and a reagent system for an on-board control. Furthermore, the invention concerns a method for checking analytical elements in which a reagent system for an on-board control is examined optically or electrochemically with the aid of a measuring instrument for changes which could indicate a stress of the analytical element.

A C-nitroso compound having a molecular weight ranging from 225 to 1,000 (from 225 to 600 for oral administration) on a monomeric basis wherein a nitroso group is attached to a tertiary carbon, which is obtained by nitrosylation of a carbon acid having a pKa less than about 25, is useful as an NO donor. When the compound is obtained from a carbon acid with a pKa less than about 10, it provides vascular relaxing effect when used at micromolar concentrations and this activity is potentiated by glutathione to be obtained at nanomolar concentrations. When the compound is obtained from a carbon acid with a pKa ranging from about 15 to about 20, vascular relaxing effect is obtained at nanomolar concentrations without glutathione. In another embodiment, a biocompatible polymer incorporates a C-nitroso moiety.

A method for preparing a functionalized polymer, the method comprising the steps of: (i) polymerizing monomer with a coordination catalyst to form a reactive polymer; and (ii) reacting the reactive polymer with a nitroso compound.

The invention discloses a method for rapidly pickling fish by mixed fermentation of microorganisms. According to the method, fresh fish or frozen fish is rapidly prepared into the pickled fish by the procedures of pre-treating fish bodies, pickling by a low-temperature wet pickling method, rinsing, inoculating a mixed microorganism fermenting agent, carrying out gradient low-temperature drying and the like, so that the time for pickling and processing the fishes can be shortened and the flavor of fish pickled products can be improved; nitrite and nitro compounds are prevented from being generated in a process of pickling the fish products, and the edible safety of the fish pickled products is guaranteed; the pickled fish processed by the method is good in flavor, is short in pickling time, low in salt content and free of the nitro compounds; the operation method is simple, the production cost is low, the energy consumption is low, the environmental pollution is small and the product quality is stable; and the economic benefits of manufacturing enterprises can be improved.

Disclosed herein is a method for inhibiting the premature polymerization of ethylenically unsaturated monomers comprising adding to said monomers an effective amount of at least one nitroso inhibitor of the structure:

wherein R₁, R₂, R₃, and R₄ are independently selected from the group consisting of hydrogen, nitro, nitroso, halogen, COOR wherein R is hydrogen or alkyl, alkyl, and heteroatom-substituted alkyl; or adjacent groups R₁, R₂, R₃, and R₄ can be taken together to form a substituted or unsubstituted fused six-membered ring.

Also disclosed is a composition of matter comprising: A) an ethylenically unsaturated monomer and B) at least one nitroso compound of the above-described structure.

The invention relates to an addition agent for lowering the content of N-nitroso compound in cigarette and the cigarette production process, wherein the addition agent is a plant polyphenol microcapsule with plant polyphenol as the core, and alpha-cyclodextrin or beta-cyclodextrin or hydroxypropyl beta-cyclodextrin is used as molecular embedding agent for charging plant polyphenol microcapsule into the molecular embedding agent, forming stabilized colloid, by dissolving the colloidal solution and adding into the shredded tobacco, the content of N-nitroso compound in cigarette can be substantially reduced.

The invention relates to a preparation process of nadroparin calcium. The preparation process comprises the following steps: S1, degrading heparin sodium; S2, reducing degradation liquid; S3, performing ultraviolet radiation, namely radiating reduction liquid by using an ultraviolet lamp to remove residual nitro compounds from the reduction liquid and reduce the content of N-NO groups; S4, performing calcium conversion and concentration, namely performing ultrafiltration on an ultrafiltration membrane by using a 5% calcium chloride solution, and concentrating the reduction liquid until the solid-liquid ratio is 1:10; S5, performing anion exchange chromatography, namely performing chromatography by adopting anion exchange resin, and collecting elution liquid; S6, freeze-drying to obtain nadroparin calcium. According to the process, the molecular weight of low-molecular-weight heparin calcium is controlled through the anion exchange chromatography, so that the molecular weight can be accurately controlled within 1% and the yield can be increased to more than 50%; moreover, the automation degree is high and the operation is convenient, so that a powerful guarantee is provided for increasing the production capacity.

The invention discloses a heat vulcanization adhesive for bonding vulcanized rubber or thermoplastic rubber with a hard panel. The heat vulcanization adhesive contains single-nitrosophenol-closed methylbenzene-2,4-diisocyanate, halogenated rubber, metal oxide such as zinc oxide or magnesium oxide, an inertia pigment filler such as carbon black or titanium dioxide, a solvent such as aromatic hydrocarbon, a chloridized solvent or a ketone solvent, a polymaleimide compound such as N,N'-interphenylene bismaleimide or diphenylmethane bismaleimide and a vulcanizer such as sulphur, selenium or tellurium. The heat vulcanization adhesive disclosed by the invention has the greatest characteristic that the single-nitrosophenol-closed methylbenzene-2,4-diisocyanate is contained, so that an aromatic polynitro compound easy to sublimate or a highly toxic polyisocyanate monomer is not used; and the heat vulcanization adhesive has 'preheating-resistant' performance or is applicable to requirements of an injection moulding process.

The invention relates to a method to manufature carbon nm tube/rubber nm compounding material. The carbon nm tube directly reacts with polysulfide under the condition of the existing of nitroso compounding. The polysulfide covalence is grafted on the surface of the nm tube, the carbon nm tube and rubber molecules are covalence combined by sulphur atoms, the polymer molecules is covalence grafts on the tube surface of the carbon nm tube. The nm compounding material is manufactured by covalence grafting the carbon nm tube and the rubber. The invention could improve the dispersibility of carbon nm tube in rubber.

The present invention is a process for the dehydration of an alcohol having at least 2 carbon atoms to make the corresponding olefin, comprising:

• a) introducing in a reactor a stream (A) comprising at least an alcohol, optionally water, optionally an inert component,
• b) contacting said stream with an acidic catalyst in said reactor at conditions effective to dehydrate at least a portion of the alcohol to make an olefin,
• c) recovering from said reactor a stream (B) comprising:
• the inert component and at least an olefin, water and optionally unconverted alcohol,
• d) optionally fractionating the stream (B) to recover the unconverted alcohol and recycling said unconverted alcohol to the reactor of step a),
• e) optionally fractionating the stream (B) to recover the inert component, water and the olefin and optionally recycling said inert component and optionally a part of the water to the reactor of step a),
• wherein,
• f) an effective amount of a component capable to neutralize a part of the catalyst active site is introduced in stream (A) or directly in the dehydration reactor and
• g) optionally the temperature of the dehydration reactor is adjusted to increase the alcohol conversion or the olefin yield or both.

In another embodiment at step f) an effective amount of a component capable to increase the selectivity for the desired corresponding olefin is introduced in stream (A) or directly in the dehydration reactor.

The component introduced at step f) can be chosen from the group consisting of ammonia, organic ammonium salts, hydrazine, nitriles, amines (including pyridines, pyrrols, pyrrolydones and pyrrolidines), amides, imines, di-imines, imides, cyanates, isocyanates, nitrites and nitroso compounds, aldehydes, ketones, carboxylic esters, and their corresponding thio-compounds (thiols, sulphides, disulfides).

Adhesive compositions effective for bonding runner to metal and containing no more than about 1000 ppm of lead especially adapted to bond vulcanized elastomers to rigid substrates, like metal are disclosed. The adhesives are useful in combination with primer coats, and as one-coat adhesives and provide durable, rubber tearing primary adhesive bonds after exposure to harsh conditions. The adhesives exhibit excellent bond versatility, sweep resistance, and in-can storage stability. In one embodiment, the adhesive compositions of the present invention consist essentially of less than 1000 ppm of lead, at least one diluent as water or organic solvent, a halogen-containing film former, optionally a nitroso compound, brominated dichlorobutadiene, and/or adhesion promoter, and an acid scavenger comprising zinc phosphate.

A process for preparing the emulsion polymerization rubber (butadiene styrene rubber) not containing nitroso compound features that the components D, E and S are used as the reaction terminating agents to replace original SDD, DEHA and sodium nitrite in a defined manner. The said D is the monoalkyl or monoaryl bithioaminoformate. The said E is the hydroxyamine hydrochloride (or sulfate). The saidS is sodium sulfite or hydrated sodium sulfide.

The invention provides a slow-release plastic expanding agent for a cement-based binding material and a preparation method of the slow-release plastic expanding agent and particularly relates to a plastic expanding agent capable of continuously generating certain expansion to compensate for early shrinkage of the cement-based binding material before the stage that a cement-based binding material mixture loses plasticity. The slow-release plastic expanding agent for the cement-based binding material is prepared from, by weight, 30-50 parts of aliphatic azo compounds, 20-40 parts of N-nitro compounds, 5-20 parts of foaming promoter and 5-15 parts of foam stabilizer. When the slow-release plastic expanding agent, polycarboxylate water reducing agent, a naphthalene water reducing agent and an aliphatic water reducing agent are compounded for use, the viscosity of the cement-based binding material mixture is slightly increased, the workability of the mixture is improved, micro-expansion is generated, and early shrinkage of the cement-based binding material mixture can be offset to a certain degree.

The invention discloses a natural rubber/butadiene styrene rubber metal HTV (Hot Vulcanization) adhesive, and relates to a rubber vulcanization adhesive. The natural rubber/butadiene styrene rubber metal HTV adhesive is prepared from the following components in percentage by weight: 1 to 2 percent of halogenated rubber, 18 to 22 percent of isocyanate, 9 to 12 percent of epoxy resin and the balance of solvent; or the natural rubber/butadiene styrene rubber metal HTV adhesive is prepared from the following components in parts by weight: 0.5 to 2.5 percent of halogenated rubber, 15 to 25 percent of isocynate, 7 to 25 percent of epoxy resin and the balance of solvent. The natural rubber/butadiene styrene rubber metal HTV adhesive disclosed by the invention contains no nitro compounds or lead salt, is used for adhering natural rubber or butadiene styrene rubber to metal through an HTV mode, and has good adhesion effect and low toxicity.

The invention provides a polymerization inhibiting method for (methyl) acrolein, (methyl) acrylic acid and esters thereof in production, transportation and storage processes. The polymerization inhibiting method is characterized in that a novel compound polymerization inhibitor is added to the solutions of (methyl) acrolein, (methyl) acrylic acid and esters thereof. The compound polymerization inhibitor involved with the polymerization inhibiting method comprises compound active ingredients formed by blending a quinone compound, an amine compound, an N-oxo-compound, and one or more than one of phenolic compounds, phenothiazine compounds and nitro compounds. The polymerization inhibitor is more effective than a single compound in polymerization inhibition effect. The polymerization inhibitor has an excellent polymerization inhibition effect in the processes of synthesis, purification, recovery and the like of (methyl) acrolein, (methyl) acrylic acid and esters thereof.