471 results about "Metal Chelating Agents" patented technology

A process for preparing a water-absorbent resin made from an α,β-unsaturated carboxylic acid as an essential monomer characterized in that the process comprises allowing a metal chelating agent to be present at any step in the process in an amount of 0.001 to 6 parts by weight, based on 100 parts by weight of the α,β-unsaturated carboxylic acid; and adding a reducing agent or an oxidizing agent thereto in an amount of 0.001 to 6 parts by weight, based on 100 parts by weight of the α,β-unsaturated carboxylic acid before initiation of drying and/or during drying of a gelated product containing a water-absorbent resin obtained by polymerization.

An oxidizing aqueous cleaning composition and process for cleaning post-plasma etch residue and/or hardmask material from a microelectronic device having said residue thereon. The oxidizing aqueous cleaning composition includes at least one oxidizing agent, at least one oxidizing agent stabilizer comprising an amine species selected from the group consisting of primary amines, secondary amines, tertiary amines and amine-N-oxides, optionally at least one co-solvent, optionally at least one metal-chelating agent, optionally at least one buffering species, and water. The composition achieves highly efficacious cleaning of the residue material from the microelectronic device while simultaneously not damaging the interlevel dielectric and metal interconnect material also present thereon.

Chromium-free coating composition with anti-corrosion and anti-fingerprint properties, particularly suitable for metal alloys, especially galvanized steel, and coated articles. Composition comprises aqueous-resin emulsion, hazardous air pollutant-free co-solvent, organo-functional silane, metal chelating agent, and chromium-free corrosion inhibitor, and optionally pH adjusting agent.

The present invention discloses one kind of chelating agent capable of treating several kinds of metal ion simultaneously. The chelating agent is synthesized with polyamine or polyethylene imine as basic skeleton and carbon disulfide in alkaline condition, where, polyamine or polyethylene imine and carbon disulfide have weight ratio of 1 to 0.6-2.0. The chelating agent of the present invention can form chelate precipitate simultaneously with several kinds of metal ion, and is especially suitable for use in purifying waste water, chemical intermediate and chemicals for printed circuit board containing metal ions.

The present invention relates to a transition metal-doped carbon fluorescent quantum dot preparation method, which comprises: dissolving a metal chelating agent and a transition metal salt in an organic solvent, carrying out a solvothermal reaction, and carrying out concentration purification after the reaction to prepare the transition metal-doped carbon fluorescent quantum dots having good water solubility. According to the present invention, the operation of the method is simple, the metal ion doping on the carbon fluorescent quantum dots can be achieved without harsh reaction conditions or large instruments, such that the characteristic that the long wavelength fluorescence emission is not easily achieved by the general carbon dots can be achieved; the obtained carbon fluorescent quantum dots have characteristics of good water solubility, wide fluorescence emission range, and maximum emission wavelength change along with concretion change; and with the characteristics of the preparation method, the prepared transition metal-doped carbon fluorescent quantum dots provide great application values in the fields of biological labeling sensing and medical imaging, photoelectricity, light-emitting device preparation, and the like.

A formulation comprises quantum dots and a quenching-preventive agent in a carrier material. The quenching-preventive agent is a metal chelating agents, a corrosion inhibitor, or a combination thereof. The formulation can be applied to a metal substrate, without experiencing metal ion induced fluorescence quenching.

This invention relates to novel acetylcysteine compositions in solution, comprising acetylcysteine and which are substantially free of metal chelating agents, such as EDTA. Further, this invention relates to methods of making and using the acetylcysteine compositions. The present compositions and methods are designed to improve patient tolerance and compliance, while at the same time maintaining the stability of the pharmaceutical formulation. The compositions and methods of this invention are useful in the treatment of acetaminophen overdose, acute liver failure, various cancers, methacrylonitrile poisoning, reperfusion injury during cardio bypass surgery, and radiocontrast-induced nephropathy, and can also be used as a mucolytic agent.

The invention relates to a heavy metal polluted crystallization encapsulated stabilizing agent and its application method, which is characterized in that the stabilizing agent comprises the following components by mass ratio: 15-25% of phosphate or sulfate, 1%-5% of heavy metal chelating agent, 20-40% of cementitious material, 30-60% of clay minerals, and the components for the sum is 100%. Compared with the prior art, the invention has the advantages of simple technical scheme, good effect, low cost and easy operation of implementation method, the leached toxicity of heavy metal in soil can reach the national standards after implementing the scheme, and the processed soil enables resource recycling. According to the invention, a pre-determination and pretreatment mode is used to reach the excellent stable effect on a plurality of heavy metal pollution.

The invention relates to the technical field of thin film transistor copper-molybdenum lamination etching, in particular to a TFT copper-molybdenum lamination film etching liquid composition. For the total weight of the composition, the composition comprises the following components: 1-30% of hydrogen peroxide by weight, 0.01-8% of hydrogen peroxide stabilizing agent by weight, 0.5-8% of phosphates by weight, 0.1-8% of inorganic acid by weight, 1-10% of metal chelating agent by weight, 0.01-5% of metal corrosion inhibitor by weight, and the balance of water. The etching liquid composition contains no fluorochemicals, so that the corrosion of a glass substrate or a silicon plate cannot be generated, no environmental pollution is generated, and the reaction is mild and easy to control; the metal chelating agent can generate copper-molybdenum ions through chelating to prevent decomposition of hydrogen peroxide from causing the life shortening and the production line danger; the copper-molybdenum etching speed is autonomously adjusted through primary cell reaction by phosphates; and the metal corrosion inhibitor is matched to prevent the copper shrinkage or the molybdenum shrinkage, so that the etching process is stable, the etching speed is proper, the etching angle is stabilized at 30-60 degrees, the critical size loss is low, and the later copper production performance is improved.

The invention provides nanoparticles consisting of a polymer which is a metal chelating agent coated with a magnetic metal oxide, wherein at least one active agent is covalently bound to the polymer, said nanoparticles may optionally further comprise at least one active agent physically or covalently bound to the outer surface of the magnetic metal oxide. Pharmaceutical compositions comprising these nanoparticles may be used, inter alia, for detection and treatment of tumors and inflammations.

The method reduces the concentration of multivalent metal cations such as calcium, magnesium, iron, nickel, and chromium in brine solution containing a water-soluble metal chelating agent such as sodium gluconate. The method comprises subjecting the brine to primary brine treatment, and then readjusting the brine solution to a pH ranging from about 1.5 to about 5.5, and contacting the brine solution with at least one resin bed comprising a chelating ion exchange resin, typically at a temperature ranging from about 10 DEG C to about 90 DEG C and at a flow rate ranging from about 4 to about 32 resin bed volumes per hour; and recovering the brine solution.

The invention relates to disinfectants, and particularly relates to a composite potassium hydrogen persulfate disinfectant and a preparation method thereof. The disinfectant is mainly prepared from the following components in percentage by weight: 20-65 percent of potassium hydrogen persulfate, 1-10 percent of sodium chloride enclosure, 5-30 percent of acid agent, 0-15 percent of effervescent, 1-10 percent of alkyl glycoside, 0-5 percent of a lubricating agent, 1-20 percent of metal chelating agent and 1-20 percent of a caking inhibitor. According to the composite hydrogen persulfate disinfectant and the preparation method thereof, the disinfectant contains the sodium chloride enclosure having oxidation resistance to avoid the reaction generated by contact of sodium chloride and other ingredients and achieve stronger stability, and does not contain alkyl glycoside to achieve the sterilizing activity higher than that of composite potassium hydrogen persulfate disinfectant without alkyl glycoside.

Aqueous, nitrogen-free cleaning composition, preparation and use thereof are provided. The composition having a pH of from 5 to 8 comprises (A) an amphiphilic nonionic, water-soluble or water-dispersible surfactant and (B) a metal chelating agent selected from polycarboxylic acids having at least 3 carboxylic acid groups. The composition is used for removing residues and contaminants from semiconductor substrates.

An effervescent tablet for improving the immunizing effect of vaccine by dissolving it in drinking water contains water-soluble non-volatile weak solid acid and hydrogen carbonate salt, water-soluble solid auxiliary and color indicator and leavy metal chelating agent.

The invention relates to a nanometer wax-removal degreasing cleaning agent and a preparation method thereof and relates to cleaning agents. The nanometer wax-removal degreasing cleaning agent is prepared from the following raw materials in mass ratio: 20-30 of detergent, 5-10 of a builder, 3-6 of an emulsifier, 6-12 of a penetrating agent, 5-10 of a metal corrosion inhibitor, 3-6 of a wax-removal surfactant, 0.5-1.0 of a metal chelating agent, 0.05-0.1 of nanometer silicon oxide and 24-58 of deionized water. The preparation method comprises the following steps of (1) adding the metal chelating agent in deionized water to obtain an aqueous solution of the metal chelating agent; and 2) adding the emulsifier, the metal corrosion inhibitor and the nanometer silicon oxide into a reactor, adding deionized water and the detergent, adding the penetrating agent, the wax-removal surfactant and nanometer silicon oxide, stirring and adding the aqueous solution of the metal chelating agent obtained in the step (1), supplementing the residual deionized water and further stirring to obtain the nanometer wax-removal degreasing cleaning agent. The cleaning agent has the advantages of high wax-removal and degreasing speeds, long application period, good cleaning effect and environmental friendliness.

The invention discloses a remediation agent for soil polluted by heavy metals. The remediation agent comprises the following ingredients in parts by weight: 23.5-25.5 parts of attapulgite, 1.8-2.2 parts of polyamide, 2.4-2.6 parts of sodium humate, 6.2-6.8 parts of a metal chelating agent, 1.5-2.5 parts of biochar, 13.5-15.5 parts of nano-silicon dioxide, 3.5-4.5 parts of poly ferric chloride, 3.5-4.5 parts of peat and 3.2-3.8 parts of calcium peroxide. The invention further discloses a remediation method of the remediation agent for soil polluted by heavy metals. The remediation method includes the steps of placing the remediation agent in a nylon mesh bag with 15-25 meshes, burying the nylon mesh bag in soil with the depth of from 15-35 cm, and removing the bag from the soil after absorption and exchange. The remediation agent, which is obtained from the combination of attapulgite and various functional materials, applies to the remediation of soil polluted by heavy metals, has the advantage of simple and convenient remediation method, and is suitable for industrial production; heavy metals in the soil can be eliminated permanently through absorption and exchange; the purpose of remediation of the soil polluted by heavy metals is achieved; the leaching concentration, mobility and toxicity of heavy metals in soil are reduced.