Abstract: The porous composite oxide particle is coated with a porous silica-based inorganic oxide layer, and also a substrate has a coating film with the fine particles thereon, which has a low refractive index and excellent in adhesion with a resin or the like, strength, the ability to reduce reflection and the like. The fine particles include porous composite oxide with silica and an inorganic oxide other than silica, wherein the fine particles are coated with a porous silica-based inorganic oxide layer having a thickness from 0.5 to 20 nm. The fine particles include preferably an organic group directly bonded to silicon, and SR/ST, the ratio of the molar amount of silicon having the organic group directly bonded thereto (SR) vs the molar amount of the total silicon (ST), is preferably in the range from 0.001 to 0.9.

Abstract: A cement dispersant (especially a dispersant for concretes with ultrahigh performance) comprising as a main component a water-soluble amphoteric copolymer obtained by copolymerizing (A) a polyamide-polyamine of an alkylene oxide adduct thereof with (B) (meth)acrylic acid or an alkali metal, ammonium, or alkanolamine salt thereof and (C) a polyalkylene glycol ester of (meth)acrylic acid in an A/B/C ratio of (10-40)/(10-40)/(50-80) (wt. %); and a concrete composition (especially an ultral high-performance concrete) containing the dispersant. The dispersant satisfies all of a water-reducing effect, slump flow retention, strength development, etc.

Abstract: The present invention provides a front plate for plasma display panels with the transparent substrate, electroconductive member and optical film fast adhered to each other, easily produced by a simple process, and excellent in productivity. The present invention further provides a method of producing the same. The present invention provides a front plate for plasma display panels comprising a transparent substrate laminated, at least on one side, with an electroconductive member and at least one type of optical film to form a monolithic structure, wherein (a) two types of adhesive layers of tackifier layer and heat-bond film are orderly placed between the optical film as the outermost layer and the adjacent member, and (b) the transparent substrate, electroconductive member and at least one type of optical film are pressed under heating.

Abstract: Provided are magnesium hydroxide particles having a hexagonal crystal form and having an aspect ratio (H) which satisfies the following expression (I), 0.45·A·B<H<1.1·A·B  (I) (wherein H is an aspect ratio, A is an average secondary particle diameter (&mgr;m) of all of the particles measured by a laser diffraction scattering method and B is a specific surface area (m2/g) of all of the particles measured by a BET method), a flame-retardant comprising the particles, a flame-retardant resin composition comprising 100 parts by weight of a synthetic resin and a 5 to 300 parts by weight of the magnesium hydroxide particles, and a molded article therefrom. The magnesium hydroxide particles are hexagonal single crystals, the hexagonal form thereof are not necessarily required to be regular hexagonal, and the size thereof are not necessarily constant.

Abstract: The invention provides a process for production of high purity 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane (BPTMC) which comprises: (a) a reaction step wherein phenol is reacted with 3,3,5-trimethylcyclohexanone (TMC) in a slurry containing phenol adduct crystals of BPTMC in the presence of an acid catalyst; (b) a neutralization step wherein after the reaction, the resulting reaction mixture in the form of slurry is neutralized with an alkali while heating to convert the slurry to a solution; (c) a primary crystallization and filtration step wherein the resulting solution is cooled and the resulting phenol adduct crystals of BPTMC are collected by filtration; (d) a secondary crystallization and filtration step wherein the adduct crystals obtained in the primary crystallization and filtration step are heated in a crystallization solvent to dissolve the crystals therein to prepare a solution and then the solution is cooled to crystallize BPTMC out of the solution, followed by collecting the crystals of

Abstract: A process for production of 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane which comprises reacting phenol with 3,3,5-trimethylcyclohexanone in the presence of an acid catalyst, adding an aqueous solution of an alkali to the resulting reaction mixture to neutralize it, removing a water phase from the thus neutralized reaction mixture, cooling the resulting oil phase to crystallize phenol adduct crystals of 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane while obtaining a primary crystallization filtrate, wherein the primary crystallization filtrate is heated to a temperature of 150-250° C. in the presence of an alkali catalyst in an inert gas atmosphere under a reduced pressure to thermally decompose 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane in the primary crystallization filtrate.

Abstract: A process for production of 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane which comprises reacting phenol with 3,3,5-trimethylcyclohexanone in the presence of an acid catalyst wherein the reaction of phenol with 3,3,5-trimethylcyclohexanone is started in a slurry comprising phenol adduct crystals of 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane and hydrated phenol in the presence of an acid catalyst, and then the reaction is continued in the slurry.

Abstract: The present invention provides a dispersion liquid of silica particles for polishing with a low content of Na ions and also with a content of ions other than Na ions in a prespecified range. This dispersion liquid is a dispersion liquid of silica particles in which the silica particles having the average particle diameter in the range from 5 to 300 nm is dispersed, and a content of Na ions in the silica particle is less than 100 ppm, while a contents of ions other than Na ions is in the range from 300 ppm to 2 weight %.

Abstract: A resin composition suitable for forming ink receptive layer of recording sheets and having excellent ink receptivity, feathering prevention, gloss and weatherability, which comprises (A) an oxyalkylene group-containing polyvinyl alcohol resin and (B) a cationic group-containing polyvinyl alcohol resin, wherein a 15% by weight aqueous solution of the resin composition has a transparency according to JIS K 6726 of at least 50%.

Abstract: The invention provides a zinc oxide particle having suppressed surface activity which gives safe and effective UV ray shielding ability (especially at longer wavelengths) to a variety of products such as resin molds, coating compositions or cosmetics, and a process for the production of the same. The zinc oxide particle of the invention has on the surface a cover layer formed of zinc silicate in an amount of 0.5-50% by weight in terms of zinc silicate (Zn2SiO4) relative to the zinc oxide. The zinc oxide particle which contains solid solution iron or cobalt therein as well as a cover layer formed of zinc silicate has effective UV ray shielding ability at much longer wavelengths while it is suppressed in the surface activity.

Abstract: The present invention provides a film for packaging chemical agents, which contains an oxyalkylene unit-containing polyvinyl alcohol resin (A) and a carboxyl-containing polyvinyl alcohol resin (B), and preferably further containing a sulfo-containing polyvinyl alcohol resin (C). This film shows fine solubility in water even after a long-term packaging of an acidic chemical agent or alkaline chemical agent, and is superior in mechanical strength. Thus, the film for packaging chemical agents of the present invention is suitably used for packaging a chemical agent, such as powdered soap, synthetic detergent, agricultural chemical, antibacterial, deodorant, insecticide and the like, which is cast into water when in use.

Abstract: Silica particles for polishing have a three-dimensional polycondensation structure with an average particle diameter in a range from 5 to 300 nm. The silica particles have residual alkoxy groups therein and a carbon content in a range from 0.5 to 5 weight % retained in the residual alkoxy groups.

Abstract: There is provided a process for preparing a polymer compound for a resist, which can improve the performance, such as the heat resistance, sensitivity and resolution of the resist, without causing film loss of the resist, line width reduction of the resist or deterioration of the dry etching resistance of the polymer. This process comprises dissolving a styrene-based monomer containing at least a 4-acetoxystyrene monomer, and a dimethyl-2,2′-azobiscarboxylate ester in a solvent, thereby to polymerize the styrene-based monomer; adding an alkali catalyst to the resulting polymer solution, thereby to hydrolyze the polymer solution; and washing the resulting polymer compound with water.

Abstract: An object of the present invention is to provide a material which resolves the drawbacks associated with polyimide polymers, and yet retains the advantages offered by conventional polyimide polymers.

Abstract: A process for producing a highly purified aqueous hydrogen peroxide solution by removing silicon oxide impurities from an aqueous hydrogen peroxide solution containing silicon oxide impurities by adding a flocculating agent and filtering out impurities of solid content contained in the aqueous hydrogen peroxide solution with a precision filter, thereafter bringing the aqueous hydrogen peroxide solution into contact with an anion exchange resin in a fluoride ion form by at least one fluoride compound which contains 0.05% by weight or less of SiF6 and is selected from the group consisting of sodium fluoride, potassium fluoride and ammonium fluoride.

Abstract: A dielectric ceramic composition for high frequency is obtained by using La and/or Nd in the main composition and iron as the additive. The main composition is expressed by the general formula x(CayTiO2+y)·(1−x)(LnzAl2−zO3) where Ln is at least one rare earth element containing La and/or Nd, and 0.600≦x≦0.730, 0.950≦y≦1.050, 0.980≦z≦1.030, and 0.01 to 0.5 parts by weight of iron as Fe2O3 is added to 100 parts by weight of the main composition. NiO may be comprised together with the Fe2O3.

Abstract: A method of manufacturing an ethylene-vinyl acetate copolymer is provided which suppresses the formation of scale and gelled product. In a continuous polymerization of ethylene and vinyl acetate in a polymerizing vessel with a cooling jacket and/or coil, the heat transfer area of the jacket and/or coil and the polymerizing calorific value per hour satisfy the following formula: A<Q/2000 wherein A is the heat transfer area (m2) and Q is the calorific value (kcal/hr) for polymerization.

Abstract: The present invention relates to a manufacturing process of a coated granular sodium percarbonate, wherein the surface of said sodium percarbonate establishes a multiple coating layer by being internally coated with a specific composition containing alkali metal silicate while externally coated with a specific composition containing alkali metal sulfate on upper part of said internally coated layer thus providing said sodium percarbonate an excellent dissolving rate in water as well as a good storage stability, preventing it from caking during delivery or storage, and being ultimately utilized as an effective detergent bleach containing zeolite as its detergent builder.

Abstract: A photovoltaic cell includes a first substrate having on its surface a first electrode layer having on its surface a semiconductor film on which a photosensitizer is adsorbed, and a second substrate having on its surface a second electrode layer. The first and second substrates are arranged so that the first electrode layer overlaid with the semiconductor film and the second electrode layer are opposite each other with an electrolyte disposed therebetween. Spacer particles are interposed between the semiconductor film and the second electrode layer, and at least one of the electrode-layer-having substrates is transparent. A coating liquid for forming the semiconductor film includes both a component for forming the semiconductor film as well as the spacer particles, dispersed in a dispersion medium.

Abstract: A coating liquid for forming a silica-containing film with a low-dielectric constant, which enables the formation of a low-density film having a dielectric constant as low as 3 or less and having excellent resistance to oxygen plasma and process adaptation but also in the adhesion to a substrate and film strength, is provided. The coating liquid for forming a silica-containing film with a low-dielectric constant comprises a polymer composition mainly constituted by (i) a polysiloxane and (ii) a readily decomposable resin, said polysiloxane being a reaction product between fine particles of silica and a hydrolyzate of at least one alkoxysilane represented by the following formula (I): XnSi(OR)4−n  (I),  wherein X represents a hydrogen atom, a fluorine atom, an unfluorinated or fluorinated alkyl group of 1 to 8 carbon atoms, an aryl group or a vinyl group; R represents a hydrogen atom, an alkyl group of 1 to 8 carbon atoms, an aryl group or a vinyl group; and n is an integer of 0 to 3.