435 results about "Ph buffering" patented technology

A slurry containing abrasive particles and a pH buffering component comprising at least one acid or salt thereof and at least one base is especially useful for polishing surfaces, including those used in microelectronics.

The present invention provides an aqueous composition for storage of red blood cells consisting essentially of: adenine; dextrose; at least one non-metabolizable membrane-protectant sugar; and a specifically defined pH buffering system. Also provided are improved methods for preserving red blood cells and methods for increasing the viability, membrane retention, and recoverability while suppressing apoptosis, hemolysis, and post-reinfusion clearance of stored red blood cells which utilize the novel compositions.

The invention relates to mixed ionic liquid formula solution, which consists of an ionic liquid A, an ionic liquid B and a mixed solvent C, wherein the positive ion of the ionic liquid A is the N,N-dialkyl imidazole positive ion or the N,N,N,N-tetra alkyl quaternary amine positive ion, while the negative ion thereof is the monobasic carboxylic negative ion; the positive ion of the ionic liquid B is the protonated alkylamine positive ion, while the negative ion thereof is the monobasic or binary or ternary carboxylic negative ion; and the mixed solvent C is aqueous solution of water, polyethylene glycol, polyglycol ether, propylene carbonate or tetramethylene sulfone. The mixed ionic liquid formula solution of the invention is strong base-weak acid and weak base-weak acid mixed salt solution, has wide pH buffering capacity, and can greenly efficiently absorb the SO2 gas in a reversible cycle mode. The mixed ionic liquid formula solution of the invention is adopted as a SO2 absorbent so that the requirement for the equipment required by SO2 absorption is simple, the operation condition of absorbing and desorbing SO2 is mild, the desulfurization efficiency is high, and the problems of waste solution and wastewater discharge and the like do not exist. The invention also discloses a preparation method for the mixed ionic liquid formula solution.

The present invention provides, inter alia, compositions comprising a pH buffering agent and a controlled-release component containing an acid-labile pharmaceutical agent. Methods of using such compositions are also provided.

The invention relates to an ink-jetting ink, in particular to a sublimation ink-jetting ink used for an industrial nozzle and a manufacturing method thereof. The sublimation ink-jetting ink comprises, by weight, 1-6% of disperse dyes, 10-14% of wetting agents, 5-20% of viscosity adjusting agents, 0.1-2% of bactericides, 0.01-1% of pH buffering agent, 1-10% of liquid resin, 0.1-40% of disperse agents, 0.01-5% of antifoaming agents, 0.1-5% of surface active agents, 0.01-2% of metal ion chelating agents and 10-80% of purified water. The manufacturing method of the sublimation ink-jetting ink used for the industrial nozzle includes color paste manufacturing and finished product manufacturing. The sublimation ink-jetting ink used for the industrial nozzle is simple in manufacturing method, smooth in ink jetting, free of blocking the nozzle, good in dispersion stability, free of going bad or denaturing even if being stored for a long time and low in cost, and diameters of dispersed ink points are even.

The invention belongs to the technical field of seed emulsion polymerization, relates to a preparation of a high polymer material, and especially relates to a small-particle-size carboxylic styrene-butadiene latex and its preparation method. Technical problems comprising unadjustable particle size, bad mechanical stability, bad chemical stability and the like of latexes in the prior art are solved in the invention. The preparation method which adopts a seed emulsion polymerization technology and adopts butadiene and styrene as monomers comprises the following steps: adding soft water, a seed latex, an electrolyte, a chelating agent and a pH buffering agent; heating; adding functional monomers, unsaturated carboxylic acid, a molecular weight adjustment agent, a composite emulsifier and an initiator; degassing when the conversion rate reaches above 98%; cooling; and synthesizing the carboxylic styrene-butadiene latex. Compared with the prior art, the preparation method of the small-particle-size carboxylic styrene-butadiene latex has the advantages of realization of the adjustment of the particle size of the latex, and simple operation; and compared with present carboxylic styrene-butadiene latexes, the carboxylic styrene-butadiene latex prepared in the invention has the advantages of narrow monodispersion, good fluidity, excellent mechanical stability and excellent chemical stability.

Compositions and methods are provided for obtaining stabilized quinol compositions, such as catecholamine drugs (e.g., epinephrine solutions), and also for obtaining stable pharmaceutical formulations that comprise a stabilized quinol composition and a second pharmacologically active component such as a local anesthetic or other active drug ingredient having a reversibly protonated amine group. Stability is achieved through the inclusion of an appropriately selected pH buffer and a thiol agent, based on redox and pH buffering principles including pKa of the buffer and of the reversibly protonated amine group.

The invention discloses an exfoliative cells preserving fluid which is prepared from a pH buffering agent, an osmotic pressure maintenance agent, preservatives, a fixing agent for maintaining cellular morphology, an anticoagulant, a mucus softener, an antimicrobial reagent, a cleaning agent, a humectant and red blood cell destroying components. The components in the preserving fluid are reasonable in proportioning, and the exfoliative cells can be preserved at a long time under normal temperature, wherein the longest time can reach 2 years; mucus can be sufficiently dissolved and the red cells can be partially destroyed; a film production effect is good, cellular distribution is very even, cellular morphology is perfect, cytoplasm and cell nucleus demarcation is distinct, gradation is clear, and cytoplasm and cell nucleus transparency is very good, and the exfoliative cells preserving fluid can be simultaneously used for the HPV-DNA (human papillomavirus-deoxyribonucleic acid), Chlamydia and immunohistochemical test; the special liquid base preserving fluid used for the cytologic examination of other parts can be provided, an imported product can be completely replaced, and the cellular constituent with diagnostic significance can be sufficiently preserved; and the exfoliative cells preserving fluid is low in configuration cost and easy to popularize.

The invention provides an aqueous zinc-nickel alloy electroplating composition particularly useful in an electroplating method for depositing a zinc-nickel alloy layer on a substrate, wherein the deposited layer exhibits uniform nickel concentration and good aesthetics across a broad range of current densities. The electroplating composition comprises an electrolyte composition and an organic composition. In one embodiment, the electrolyte composition comprises a zinc ion source, a nickel ion source, a pH buffering agent and at least one additional salt, and the organic composition comprises a Class I nickel brightener, a Class II nickel brightener, an aromatic carboxylic acid, an aldehyde or ketone compound, and a non-ionic or anionic surfactant. The electroplating composition is particularly free of chelators and free ammonium-producing agents.

The invention provides a chemical copper plating solution for a polyimide film and a surface chemical copper plating method thereof, wherein the chemical copper plating solution is a water solution containing copper salt, ascorbic acid or soluble ascorbic acid salt, a complexing agent, a metal catalyst, a stabilizer and a pH buffering agent. The pH value of the chemical copper plating solution is5.5-8.0, and the concentration of the stabilizer is not higher than 50milligrams/liter. The chemical copper plating solution provided by the invention is a neutral copper plating solution, adopts thenontoxic environment-friendly ascorbic acid or soluble ascorbic acid salt as a reducer, is suitable for the surface chemical copper plating of the polyimide film, and has good effect on environment protection.

The invention provides a metal salt-free sealing agent for an aluminum alloy anodic oxide film, belonging to the technical field of aluminum alloy anodic oxide film post treatment. The sealing agent of the invention is prepared by water solution composed of 1.0-10g/L of a hydration accelerator, 0.01-2g/L of a wetting agent, 0.01-3g/L of an ash inhibitor and 1-15g/L of a pH buffering agent, wherein the pH of workpiece fluid is 5.5-6.5, the operating temperature is 70-90 DEG C, and the sealing speed is 1.0-2.0min/um. The metal salt-free sealing agent creatively adopts organic compounds which are easily subject to biodegradation, does not contain any metal ions of nickel, cobalt, magnesium, calcium, lithium and the like as well as fluorinions, and obtains satisfactory sealing effect of the nano-pores of the aluminum alloy anodic oxide film by virtue of the scientific and coordinated component formula of the water solution; the aluminum alloy anodic oxide film obtained by seal treatment through the sealing agent has the advantages of good corrosion resistance, capability of meeting the requirements of GB 14952.1-94, good light-protection and color-protection properties of a film layer, no ash and pruina, no water stain after drying as well as light flowing color and small color difference change in case of sealing the organic dyeing film; and the metal salt-free sealing agent is widely applicable to sealing treatment of an original-color anodic oxide film, an electrolytic coloring anodic oxide film, a hard oxide film and a dyeing anodic oxide film.

The present invention provides a freeze-dried medicine composition containing methylprednisolone sodium succinate and its preparation method. Said medicine composition includes 1-3000 mg of methylprednisolone sodium succinate as main component and auxiliary component including 1-1000 mg of sodium hydrogen carbonate or other alkaline medicinal auxiliary material 1-500 mg of lactose or other stabilizing agent. 1-50 mg of sodium dihydrogen phosphate or acid component of other pH buffering agent, 1-500 mg of disodium hydrogen phosphate or alkaline component of other pH buffering agent and 1-50 ml of injection water.

The invention discloses a cyanide-free gold plating solution. The cyanide-free gold plating solution comprises sulphurous acid gold salt, a main complexing agent, an auxiliary complexing agent, conducting salt, a stabilizing agent and a pH buffering agent. Under the synthetic action of the sulphurous acid gold salt, the stabilizing agent and the other components, stable composite complex ions are formed through the cyanide-free gold plating solution, the plating solution is more stable, the storage period of the plating solution is long, and the sealed storage period at the normal temperature can reach over 6 months.

The invention relates to a preparation method of fluorinated hydroxy vinyl tertcarbonate-acrylate copolymer emulsion with a core-shell structure, comprising the following steps: (1) mixing deionized water with 20 percent to 45 percent of reactive emulsifier relative to the total quantity, stirring and dissolving the mixture, then slowly dripping core layer monomer mixing liquid and preemulsifyingto prepare a core preemulsion for standby; (2) mixing deionized water with 20 percent to 45 percent of the reactive emulsifier relative to the total quantity , stirring and dissolving the mixture, then slowly dripping shell layer monomer mixing liquid and preemulsifying to prepare a shell preemulsion for standby; and (3) adding 5 percent to 30 percent of the core preemulsion relative to the totalquantity into a reactor containing 10 percent to 60 percent of the reactive emulsifier relative to the total quantity, a pH buffering agent and deionized water and dispersing; and then adding 10 percent to 30 percent of an initiating agent relative to the total quantity to prepare seeds; after the emulsion turns blue and no obvious back flow is caused in the reactor, dripping the residual core preemulsion and 35 percent to 45 percent of the initiating agent relative to the total quantity; and then dripping the shell layer monomer preemulsion and 35 percent to 45 percent of the residual initiating agent relative to the total quantity to carry out reaction to obtain the fluorinated hydroxy vinyl tertcarbonate-acrylate copolymer emulsion with the solid content of 40 percent to 50 percent. Theemulsion prepared by the method has the advantages of prominent anti-aging performance and obviously improved resistance to water, alkali and washing.

The invention discloses a polishing composition for improving surface quality of sapphire. The polishing composition comprises the following substances: an abrasive, a salt composition, organic components, a pH buffering agent, a pH regulator and water. Compared with the prior art, the polishing composition has the advantages that by addition of the organic components, the smoothness of the polished sapphire surface can be obviously improved, the roughness of the polished sapphire is reduced, and the polished surface is hydrophilic and is easily cleaned.

A method of manufacturing an ink jet recording paper comprising the steps of: (a) applying a first coating composition containing inorganic microparticles and a binder onto a support to form a porous ink absorbing layer; (b) drying the porous ink absorbing layer; (c) applying a second coating composition onto the porous ink absorbing layer during the drying step (b); and (d) drying the porous ink absorbing layers, wherein the second coating composition exhibits a pH buffering function, and both conditions (1) and (2) are satisfied at the same time: Condition (1) pH^b−pH^c<1.0<pH^c−pH^a, Condition (2) pH^a<pH^b, wherein pH^a, pH^b, and pH^c are respectively a pH value of the first coating composition, a pH value of the second coating composition, and a pH value of a surface of the ink jet recording paper.