Abstract: An amino acid-N,N-diacetic acid (AADA) or its salt with an equivalent or less of an alkali metal is produced by reducing, through electrodialysis, alkali metal ions from an aqueous solution of the alkali metal salt of an AADA. By this configuration, an AADA salt can be produced in a much higher yield than conventional equivalents without requiring a regeneration operation of a resin as in the use of an ion exchange resin or without requiring crystallization-separation of crystals of the AADA salt as in the addition of an organic solvent. A salt of an amino acid-N,N-diacetic acid is also produced by reacting an AADA with any of metal oxides, metal hydroxides, metal carbonates, metal hydrogencarbonates, ammonium hydroxide, ammonium carbonate, ammonium hydrogencarbonate or organic amine compounds. By this configuration, a metal salt, ammonium salt or organic amine salt of an AADA can be produced with efficiency without the formation of by-products.

Abstract: The abrasive machine is capable of preventing deformation and bad abrasion of an abrasive cloth, maintaining flatness of an abrasive face of an abrasive plate and improving abrading accuracy. The abrasive machine comprises the abrasive plate and a holding unit for holding a work piece. In the holding unit, an inner head has a first concave section. An outer head has a second concave section. A holding plate is provided in the first concave section. An elastic holding member forms a first chamber. An outer enclosing member is provided to the outer head. An inner enclosing member is provided between the outer enclosing member and the inner head. A pressing member presses the abrasive face of the abrasive plate and encloses the holding plate. An elastic ring member a second chamber. A pressurizing unit pressurizes the chambers so as to press the work piece and the pressing member onto the abrasive face.

Abstract: A high-concentration liquid detergent composition, which does not have strong alkalinity, which has excellent compatibility even if the surfactant concentration is increased, and which is free of white turbidity, comprising (A) one or more surfactants selected from a nonionic surfactant and an anionic surfactant, (B) one or more builders selected from an amine salt and an alkali metal-amine mixed salt of aminopolycarboxylic acid chelating agent, and (C) one or more solubilizing agents selected from alcohols, with component (A) being present in a concentration of 20 wt % or more.

Abstract: The object of the invention is to provide a polishing machine, which are capable of making the degree of plane higher. The polishing machine comprises: a polishing plate for polishing a work, which is pressed thereon, the polishing plate being capable of rotating; and a driving mechanism for rotating the polishing plate, characterized in that the driving mechanism is capable of rotating the polishing plate in one direction and the other direction. In the polishing machine, since the work is polished by rotating the polishing plate in the one direction, then rotating it in the other direction, slury concentrated at a specific position of the work can be scattered, so that the work can be polished uniformly and the degree of plane can be higher.

Abstract: In a process for producing a stabilized oxymethylene copolymer by heat-melting, at a temperature ranging between the melting point of the copolymer and a temperature 100.degree. C.