Abstract: A perforated tray without downcomer having only a small deviation between the opening ratio based on the diameter of a column and the actual opening ratio and a perforated tray column without downcomer formed by disposing such perforated trays without downcomer are provided. The perforated trays without downcomer are characterized by having a ratio of (A)/(B) in the range of 1.1-1.5, wherein A denotes the opening ratio found from the standard pitch between centers of holes and (B) denotes the opening ratio based on the diameter of a column.

Abstract: A cement admixture object of the present invention can make slump-retaining ability excellent to retain fluidity and, at the same time, can realize a viscosity of cement compositions so that work becomes easy at a field handling them, can make the state of a cement composition better. The present invention relates to a cement admixture which comprises a polycarboxylic acid copolymer having a polyalkylene glycol side chain, said polycarboxylic acid copolymer being constituted of two or more species of copolymers with different acid values, and at least one of said two or more species of copolymers with different acid values having an oxyalkylene group containing 3 or more carbon atoms.

Abstract: A polycarboxylic acid cement dispersant that can exhibit high dispersing ability and allow deforming in early stages in the case of producing concrete products, whereby the turnover of a formwork is increased so as to improve productivity, and the method of producing such as concrete product are provided. The polycarboxylic acid cement dispersant which provides a cement composition having a penetration resistance value exponent of 55 MPa or more and a slump retention exponent of 80% or more, and the method of producing a concrete product which makes use of a copolymer derived by using monomer components comprising the monomer (A) as polyalkylene glycol unsaturated monomer, the monomer (B) as unsaturated carboxylic monomer, and the monomer (C) as sulfonic acid group-containing monomer.

Abstract: The present invention is a method of producing a (meth)acrylic acid based water-soluble polymer having a content of groups in neutralized state of not more than 90 mole percent, where the sum total of acid groups and groups in neutralized state contained in the (meth)acrylic acid based water-soluble polymer is taken as 100 mole percent, which comprises a photopolymerization step of polymerizing a monomer component by irradiating near-ultraviolet rays to a reaction mixture, the said reaction mixture comprising the monomer component, a photopolymerization initiator, a chain transfer agent and a polymerization solvent, the said monomer component containing not less than 50 mole percent of a (meth)acrylic acid monomer, with the whole monomer component subjected to polymerization being taken as 100 mole percent, and a concentration of the said monomer component in the reaction mixture at the time of polymerization being 40 to 97% by mass.

Abstract: There are provided a catalyst for catalytic gas phase oxidation of acrolein with molecular oxygen to produce acrylic acid, the catalyst including molybdenum and vanadium and further including at least one volatile catalyst poison ingredient in an amount of 10 to 100 ppb by mass as measured by ion chromatography; and a process for producing acrylic acid, including a step of carrying out catalytic gas phase oxidation of acrolein with molecular oxygen using the catalyst. The catalyst of the present invention can lower a hot spot temperature and suppress reduction in a reaction efficacy accompanied with thermal degradation, so that the acrolein conversion can stably be kept higher over a long term.

Abstract: The present invention relates to halogen-containing aromatic compounds and methods thereof. The present invention relates a halogen-containing aromatic acid dianhydride, halogen-containing aromatic tetranitrile compound, halogen-containing m-phenylenediamine compound and fluorine compound, and a method thereof.

Abstract: Zinc acrylate excelling in flowability is provided. It is produced by a method, characterized by dispersing zinc oxide in any of (a) an aliphatic hydrocarbon solvent, (b) a mixed solvent formed between an aliphatic hydrocarbon solvent and an aromatic hydrocarbon solvent, and (c) a mixed solvent formed between an aromatic hydrocarbon solvent and an alcohol and causing acrylic acid to react with said zinc oxide in said solvent. The obtained zinc acrylate refrains from undergoing secondary aggregation, excels in disintegrability and, when kneaded in a rubber composition, exhibits excellent dispersibility.

Abstract: It is an object of the present invention to provide a polyalkyleneimine alkyleneoxide copolymer, which is suitably used as a builders for a detergent, a detergent, a water treatment agent, a dispersant and the like and which can exert high basic performance in point of the detergency or the like, a production method thereof, and use thereof.

Abstract: The present invention provides an innovative N-vinylamide polymer with decreased contents of impurities and suppressed coloration, a higher K-value, and preferably usable in a variety of fields such as cosmetic and pharmaceutical products, and to provide a production method of the polymer. An N-vinylamide polymer comprising an N-vinylamide monomer unit, wherein the N-vinylamide polymer has K-value of 60 or higher, a content of hydrolysis products of N-vinylamide monomer of 0.02% by weight or less, a content of ashes of 0.1% by weight or less, and hue of 10% aqueous solution of 10 or less measured according to JIS K0071.

Abstract: The present invention provides: a high-quality hydroxyalkyl (meth)acrylate of which the alkylene glycol di(meth)acrylate content and the acid component content are both low; and its novel production process. The hydroxyalkyl (meth)acrylate, which has a content, in terms of an alkylene glycol di(meth)acrylate as an impurity, of not more than 0.1 weight % and an acid component content of not more than 0.1 weight %, is obtained by a process comprising the step of carrying out a batch reaction between (meth)acrylic acid and an alkylene oxide in the presence of a catalyst in order to produce the hydroxyalkyl (meth)acrylate; with the process making an adjustment as to charging of both raw materials in such a manner that, for, of a time as needed for supplying both raw materials, a supplying time of not less than 40% of a total supplying time when the raw materials as supplied have a temperature of not lower than 40° C.

Abstract: A method for efficient production of an S-hydroxynitrile lyase by gene recombination using Escherichia coli is provided. A gene is formed by altering a codon in an S-hydroxyniitrylase gene originating in cassava (Manihot esculenta Crantz) without changing the amino acid sequence thereof till the frequency of codon usage wholly with an amino acid in Escherichia coli reaches a level of not less than 5%. According to the method for the production of an S-hydroxynitrile lyase by the use of the gene, the S-hydroxynitrile lyase can be produced in a large amount with an unusually high yield.

Abstract: To provide a cement admixture which makes it possible to: enhance slump maintaining capability; maintain fluidity; and provide a cement composition and the like having an appropriate viscosity for handling at the place where the composition and the like is handled. A cement admixture comprising an alkylene oxide adduct comprising a compound having 3 or more active hydrogens and an oxyalkylene group added to the compound, wherein an average molar number of addition of the oxyalkylene group relative to 1 mole of the active hydrogen is 100 mole or more.

Abstract: An object of the present invention is to provide an aqueous resin composition and its uses, wherein the aqueous resin composition combines the blocking resistance and the frost damage resistance and thereby can secure the durability over a long period of time even under circumstances where a severe temperature cycle is present. As a means of achieving this object, the aqueous resin composition according to the present invention is an aqueous resin composition comprising an acrylic resin emulsion and a crosslinking agent as essential components, with the aqueous resin composition being characterized in that, when a coating film is formed from the aqueous resin composition, the formed coating film exhibits an elongation ratio (E (%)) that satisfies a specific relational expression along with the glass transition temperature (TgT (° C.)) of the acrylic resin in the emulsion.

Abstract: In the process of synthesizing alkylborazine compound represented by the chemical formula 2, by a reaction of a halogenated borazine compound represented by the chemical formula 1 with a Grignard reagent, thus synthesized alkylborazine compound is washed with water, or subjected to sublimation purification or distillation purification at least three times, and/or subjected to distillation purification at least twice. In the formulas, R1 independently represents alkyl group; R2 independently represents alkyl group; and X represents halogen atom.

Abstract: To provide an emulsion for vibration damping materials particularly excellent in vibration damping property in a wide temperature range, and therefore useful for vibration damping materials of various structures. An emulsion for vibration damping materials, comprising an acrylic copolymer prepared by copolymerizing a monomer component comprising a polar group-containing monomer, wherein the polar group-containing monomer has a SP value (solubility coefficient) of 10.0 or more and 14.0 or less; and An emulsion for vibration damping materials, comprising an acrylic copolymer prepared by copolymerizing a monomer component comprising a polar group-containing monomer, wherein the polar group-containing monomer is acrylonitrile, and the polar group-containing monomer is less than 10% by weight relative to 100% by weight of the total monomer component.

Abstract: Fluoroaryl magnesium halide is reacted with a boron compound so that a molar ratio of the fluoroaryl magnesium halide to the boron compound is not less than 3.0 and not more than 3.7, so as to produce a tetrakis (fluoroaryl) borate.magnesium compound. With this method, there occurs no hydrogen fluoride which corrodes a producing apparatus and requires troublesome waste water treatment.

Abstract: This invention is providing a method for efficient treatment of the waste material from a process for production of acrylic acid and an acrylic ester. This is a method for the disposal of waste material, which at least one waste material selected from the group consisting of waste oil, waste water, and waste gas emitted from a process for production of acrylic acid is/are purified with at least one waste material selected from the group consisting of waste oil, waste water, and waste gas emitted from a process for production of an acrylic ester jointly. The efficiency of the treatment is enhanced by simultaneously treating the waste material.

Abstract: An object of the present invention is to provide an excellent process for production of a surface-treated particulate water-absorbent resin wherein the process adopts a surface-treatment process that can enhance the properties (which the water-absorbent resin is desired to have) to extremely high levels, and also can solve the prior problems in such as safety, and further can sufficiently carry out the treatment even at a reaction temperature near room temperature. As a means of achieving this object, the process according to the present invention for production of a surface-treated particulate water-absorbent resin is characterized by comprising the steps of: adding a treating liquid to a particulate water-absorbent resin as a base polymer, wherein the treating liquid contains a radically polymerizable compound; and then irradiating the particulate water-absorbent resin with active energy rays while fluidizing the particulate water-absorbent resin, thereby surface-treating it.

Abstract: The present invention is to provide a super-absorbent resin which can be used to design an absorbing core or absorbing goods capable of being flown into a flushing toilet. The present invention relates to a super-absorbent resin having as a main component thereof a repeating unit having an ionic dissociation group in its main or side chain, wherein said resin has absorption capacity without load to saline solution (CRCs) for 4 hours of not smaller than 10 g/g, and solubility in ion-exchanged water of not lower than 50% by weight.

Abstract: The present invention provides a method for manufacturing a particulate water-absorbing agent which has excellent liquid diffusibility and liquid permeability, and whose amount of residual monomers is reduced. The method for manufacturing the particulate water-absorbing agent of the present invention includes a step of surface-crosslinking, in the presence of an organic crosslinking agent, water-absorbing resin particles obtained through at least a step of polymerizing an aqueous solution of unsaturated monomers, and in or after the polymerizing step, a reaction system is mixed with peroxide. Thus, it is possible to obtain the particulate water-absorbing agent which has excellent liquid diffusibility and liquid permeability and whose amount of residual monomers is small, that is, it is possible to obtain the particulate water-absorbing agent which is highly functional and highly safe.