Showing papers on "Methyl isobutyl ketone published in 1985"

Theoretical studies of the electron scattering effect on developed pattern profiles in x‐ray lithography

Abstract: Monte Carlo calculations of the photo and Auger electron production by a monochromatic x ray of Al Kα have been performed to study the effect of their diffusion in a 1.0‐μm polymethyl methacrylate resist film on replicated patterns both with and without the Si substrate. Based on both the calculated spatial distribution of the absorbed energy density and the solubility rate for mixture developers of methyl isobutyl ketone (MIBK) and isopropyl alcohol (IPA), investigations were carried out on the x‐ray resist sensitivity, the ultimate resolution, and the mask contrast effect on developed profiles. Typically, the ultimate resolution was found to be 1000 A with MIBK and to be 400 A with MIBK : IPA=1 : 3. There was no significant influence of the Si substrate on the developed patterns.

Solvent extraction of phenol from aqueous solution in a hollow fiber device

Abstract: The extraction of phenol from aqueous solution was studied in a novel type of device—a hollow fiber “shell and tube bundle” unit. The need for coalescence and settling of the two phases involved is avoided with this type of contacting scheme. Various solvents (n-hexanol, n-octanol, ii-decanol, methyl isobutyl ketone, and n-butyl acetate) were used on the shell-side; the phenol solution was pumped through the tube-side. In other runs, powdered activated carbon was packed into the shell-side. The effects of solvent type, powdered carbon use, feed stream flow rate, and the addition of acid or base to the feed were studied. A successful mathematical model for the system was developed.

Method of recovering iron oxide

Abstract: PURPOSE: To efficiently recover high-purity iron oxide powder having uniform shape and particle size, by extracting reversely an iron salt separated from iron salt-containing waste liquor with an organic extracting solvent to transfer the salt to an aqueous phase, treating the salt with urea to form iron hydroxide and converting it into iron oxide. CONSTITUTION: Iron salt-containing waste liquor such as acid washing waste liquor in iron-manufacturing industry, etc., is oxidized by introducing air into a ferric salt in the case where a ferrous salt is contained, brought into contact with an organic solvent such as methyl isobutyl ketone, etc., and an iron component is extracted in the solvent. Then, the iron complex-containing organic extracting solvent is brought into contact with iron exchange water or acidic water, the iron salt is reversely extracted from the solvent and transferred to the aqueous phase, to give a purified ferric salt solution. When the solvent remains in the solution, preferably the solvent is removed, the solution is heated with about 1.5mol based on dissolved iron salt of urea. NH 4 OH generated by the treatment is reacted with the iron salt to form iron hydroxide or iron oxide, which is recovered and the iron hydroxide is converted into iron oxide to give high-purity iron oxide. COPYRIGHT: (C)1987,JPO&Japio

Determination of diethyllead in the urine by flameless atomic absorption spectrometry.

Abstract: A method for the determination of diethyllead in urine by flameless atomic absorption spectrometry after chelation with glyoxal-bis (2-hydroxyanil) and extraction of the formed complex with methyl isobutyl ketone is described. The method is specific in relation to both triethyllead and inorganic lead. The limit of detection was 3.2 micrograms Pb/l and the relative standard deviation in the concentration range 20-100 micrograms Pb/l was 0.076.

Performance control of positive-working electron beam resists by copolymerization and blending.

Abstract: EB exposure characteristics, such as sensitivity and contrast, and durability against oxygen plasma were measured with linear copolymers and polymer blends of various composition, which were prepared from α-methylstyrene [MSt] and methyl methacrylate [MMA]. Moreover, new developers were examined for these polymers, since sensitivity and contrast of the positive-working resist system depend largely on dissolution kinetics concerning each combination of the resist polymer and the developer. Methyl isobutyl ketone and isoamyl acetate were used as the developer, though they were developers of excessive dissolving power for PMMA and /or PMSt homopolymers. The copolymers containing 30—50 mol% of MSt were as durable as PMSt homopolymer against oxygen plasma and had higher contrast than PMMA. The blend had dryetching durability as large as the copolymer of the same composition, and showed considerably high contrast, while the copolymer had higher sensitivity than the blend. The blends containing 21 mol% or less of MSt monomer units were much more durable than PMMA and of contrast as high as PMMA, but less sensitive than PMMA.

Conformational transitions in polymethacrylates. Effect of the side chain

Abstract: The temperature dependences of viscometric, refractometric and densitometric data have been studied for several polymethacrylates: poly(methyl methacrylate), poly(isobutyl methacrylate), poly(phenyl methacrylate) and poly(cyclohexyl methacrylate) in methyl isobutyl ketone solution. It has been found that these polymers change their conformation over specific temperature ranges, as evidenced by sharp changes of the unperturbed dimensions (Kθ), refractive-index increment (dn/dc) and partial specific volume (text-decoration:overlinev2). The influence of the side group, particularly its nature and size, on the phenomenon has also been studied.The results for poly(cyclohexyl methacrylate) are particularly interesting. The nature of the side group in this polymer allows a contribution from the side chain to the main-chain conformational transition.Finally, several semi-empirical relations have been proposed which correlate different thermodynamic parameters.

Iodide determination in blood by gas chromatography.

Abstract: A gas chromatographic method suitable for determination of blood iodide in concentrations reported for burn patients treated with iodophors is described. The iodide is reacted with methyl isobutyl ketone to form an iodoketone, extracted into hexane containing an internal standard, and analyzed by gas chromatography using a packed column and an electron capture detector.

Atomic absorption spectrophotometric determination of chromium in foods

Abstract: A method is reported for determination of chromium in foodstuffs. Organic matter is digested with nitric acid, followed by oxidation to Cr(VI) and extraction with methyl isobutyl ketone (MIBK) after HCl addition. Chromium determinations are performed by flame absorption spectroscopy. Absence of interferences is verified and recovery tests are performed on food samples. Quantitation limit (3.8 ng/mL), accuracy (NBS Standard Reference Material 1,573 Tomato Leaves, 4,500 +/- 500 ng/g, found 3,860 +/- 409 ng/g), and precision (CV for vegetable matrix = 9.05%, CV for animal matrix = 14.95%) of the procedure are evaluated.

Process for production of methyl isobutyl ketone

Abstract: A process for production of methyl isobutyl ketone (MIBK) from acetone and hydrogen by a one-stage reaction comprises contacting acetone and hydrogen in the presence of a catalyst comprising niobic acid and palladium. The catalyst has excellent activity, MIBK selectivity, and service life, and thus permits production of MIBK in high yield for long periods of time.

The indirect determination of trace reactive silicon in waters by neutron activation analysis

Abstract: Reactive silicon in waters was determined indirectly by counting 101Tc after neutron activation of molybdosilicic acid (MSA) extracted with methyl isobutyl ketone (MIBK). The detection limit (defin...

Preparation of antioxidant substance and antibacterial substance existing in licorice

Abstract: PURPOSE:To obtain the titled substance having low impurity content, improved color and odor, and increased activity, and useful as an antioxidant, etc. of oils and fats, etc., by extracting licorice or a residue left after the extraction of a sweet component from licorice with an aqueous solvent, using a hydrophobic ketone as the extractant. CONSTITUTION:Licorice or a residue left after the extraction of a sweet component such as glycyrrhizin, etc. from licorice with an aqueous solvent, is extracted with a hydrophobic ketone (preferably a 4-8C ketone such as methyl isobutyl ketone), and the extract is concentrated and dried to obtain the objective antioxidant and antibacterial substance. The two substances are different from each other. For example, the component purified by the adsorption and elution with a basic anion exchange resin exhibits only antibacterial activity. The amount of the substances to be added to foods, etc. is preferably 0.005- 0.1% each.

Treatment of alcohol-containing water

Abstract: PURPOSE:To separate and recover easily alcohol by bringing alcohol-contg. water contg. an easily volatile material and/or azeotropic material into contact with an extractant then treating the alcohol remaining in said waste water. CONSTITUTION:The alcohol-contg. water contg. the easily volatile material and/ or azeotropic material (e.g., methyl isobutyl ketone) is brought into contact with the extractant (e.g., a liquid mixture composed of decanol and tri-n-butyl phosphate) to extract the easily volatile material and azeotropic material into the extractant. The alcohol-contg. water subjected to the extraction treatment is subjected to an activated sludge treatment or distillation treatment as a biological treatment. More specifically, the materials which are difficult to be biologically treated are removed and therefore the efficiency of the biological treatment for the waste water is considerably improved and the quality of the treated water obtainable by the treatment is good. Since the material which hinders the recovery of alcohol is simultaneously removed, the recovery of alcohol is made easy and the recovering efficiency is improved as well. The recovered alcohol has extremely high purity.

Extraction and flameless AAS determination of germanium in lignite fly ash

Abstract: The use of dicyclohexyl-18-crown-6 methyl isobutyl ketone solution in extraction and flamelessatomic absorption spectrophotometry (AAS) determination of germanium in lignite fly ashes have been stu...

A study of the extraction of phosphovanadomolybdic acid and application to the neutron activation analysis of phosphorus in steels

Abstract: We have studied the extraction of phosphovanadomolybdic acid labelled with32P. From the influence of the acidity on the distribution coefficient of phosphorus, we show that the phosphovanadomolybdic acid has four acidic groups. Under our experimental conditions, this compound is formed from condensed species of molybdenum and it is quantitatively formed in the acidity range 1N<[H+]<2N. The highest yield of extraction has been obtained with methyl isobutyl ketone. The best conditions for the extraction of phosphorus have been applied to the experimental procedure for the neutron activation analysis of phosphorus in steels. The results obtained for standard samples are good except for steel containing niobium which is an interfering element.

Manufacture of magnetic powder

Abstract: PURPOSE:To apply a heat-resisting component, a magnetism adjusting component, an anti-oxidizing component, etc. uniformly on the surfaces of crystal grains as the precursors of magnetic powder for magnetic recording, and to obtain powder having excellent magnetic characteristics by applying these components under the state of slurry by using a high-speed sispersion agitator when these components are applied on the surfaces of the crystal grains. CONSTITUTION:When a heat-resisting component, a magnetism adjusting component, an anti-oxidizing component, etc. are applied on the surfaces of crystal grains as the precursors of magnetic powder for recording, magnetic paints mentioned below are prepared to a slurry state and applied on a polyester base, oriented magnetically, and smoothed by a calender roll. That is, sixty pt. magnetic powder, a fifteen pt. vinyl chloride-vinyl acetate copolymer, five pt. polyurethane resin, a 0.7pt. surface-active material, each seventy-five pt. methyl ethyl ketone and methyl isobutyl ketone and a two pt. lubricant are mixed and brought to the state of slurry, turned at peripheral speed of 3-30m/sec, passed through a clearance in a high-speed dispersion agitator in which a clearance between a turbine and a stator is brought to 0.1-2mm., and applied on a film.

Preparation of 2,2-dimethylcyclopropanecarboxylic acid amide

Abstract: PURPOSE:To produce the titled compound useful as an intermediate of pharmaceuticals and agricultural chemicals, etc, in high yield and purity, by reacting 2,2-dimethylcyclopropanecarboxylic acid with thionyl chloride at a specific molar ratio, and reacting the product with ammonia CONSTITUTION:The objective 2,2-dimethylcyclopropanecarboxylic acid amide can be prepared by reacting 2,2-dimethylcyclopropanecarboxylic acid with thionyl chloride at a molar ratio of 1:102-13, and reacting the reaction product with ammonia The reaction of 2,2-dimethylcyclopropanecarboxylic acid with thionyl chloride is carried out at 0-150 degC, preferably 10-100 degC, and 2,2-dimethylcyclopropanecarboxylic acid chloride can be produced by the reaction as an intermediate The reaction of the intermediate with ammonia is carried out preferably by using ammonia water as the ammonia source, in the presence or absence of a hardly soluble organic solvent (eg methyl isobutyl ketone)

Treating method of magnetic iron oxide particle powder for magnetic recording

Abstract: PURPOSE:To obtain magnetic iron oxide particles having large bulk density and excellent milling characteristics by adding acetic acid of 0.1-2.0wt% to Fe2O3 to magnetic iron oxide particles and treating the surfaces of the particles with acetic acid. CONSTITUTION:Acicular crystal goethite particles are formed by oxidizing a reaction aqueous solution of a ferrous salt aqueous solution and alkali by air. Acicular crystal maghemite particle powder is obtained by heating-dehydrating, reducing and re-oxidizing said particles. The 1,000g particle powder and 5.7ml 0.1-2.0wt% acetic acid are charged into an edge runner, and compaction-ground for 60min. Acicular crystal maghemite particle powder on which obtained acetic acid adheres is used, a mixed solvent consisting of a proper amount of a dispersant, a vinyl-chloride vinyl-acetate copolymer resin, a thermoplastic polyurethane resin, toluene, methyl ethyl ketone and methyl isobutyl ketone is compounded at a predetermined composition, and mixed and dispersed, thus manufacturing magnetic paints.

Fabrication of resist pattern

Abstract: PURPOSE:To perform the fine processing with a high sensitivity by a method wherein when the positive electron beam resist spread over a substrate is irradiated with a beam to form a latent image followed by development to form a pattern, the treatment is done by use of a developing solution having a strong solvent power to leave the resist at the bottom of a recess and then a developing solution of a gentle solvent power is used to form the pattern. CONSTITUTION:A substrate 1 is coated with a film to be processed 2 and is covered with a positive electron beam resist film 3 having the thickness enough to prevent a pin hole followed by baking after which irradiation with an electron beam 4 is made only for a necessary part. Thus a backbone of the film 3 which is irradiated with the beam 4 is cut to make it low-molecular thereby increasing solvent properties for a solvent. Then it is developed by using a developing solution having a strong solvent power such as methyl isobutyl ketone and a recess 5 is formed on the film 3 at the bottom of which the film 3 remains. After that, a developing solution of a gentle solvent power such as a methyl isobutyl ketone-isoamyl acetate mixing solution is used to remove the film 3 left at the bottom of the recess 5.

Process for drying vesiculated polymeric beads

Abstract: A process for drying a water-wet paste containing polymeric beads without agglomeration is disclosed in which there is added to the wet paste a proportion of an organic solvent which forms an azeotrope with water, such as methyl isobutyl ketone, in an amount providing a stirrable mixture, and the solvent-containing aqueous paste is heated to remove the water as an azeotrope with the solvent and to produce a water free suspension of the beads in organic solvent. The proportion of azeotropic solvent can be minimized by adding a resinous vehicle in organic solvent solution to the solvent-containing aqueous paste after substantially all the water has been removed, and continuing the application of heat to remove undesired organic solvent and thereby increase the solids content. As a feature of the invention, a pigment which is incompatible with the azeotropic solvent, such as an aqueous dispersion of lamp black, is added to the aqueous paste either before or after the addition of azeotropic organic solvent to be present while the water is azeotropically removed to avoid flooding.