Abstract: Provided is a method of producing a polycarboxylic acid-based polymer, the method including adding a monomer composition containing an unsaturated monocarboxylic acid-based monomer and/or an unsaturated dicarboxylic acid-based monomer to a reaction vessel to perform a polymerization reaction, which enables effective suppression of the foaming of a polymerization reaction liquid. The method of producing a polycarboxylic acid-based polymer of the present invention is a method of producing a polycarboxylic acid-based polymer, the method including adding a monomer composition containing an unsaturated monocarboxylic acid-based monomer and/or an unsaturated dicarboxylic acid-based monomer to a reaction vessel to perform a polymerization reaction, the method further including adding a defoaming agent by a time when 100 mass % of a total amount of the monomer composition is added.

Abstract: Provided is a method of producing a polycarboxylic acid-based polymer, the method including adding a monomer composition containing an unsaturated monocarboxylic acid-based monomer and/or an unsaturated dicarboxylic acid-based monomer to a reaction vessel to perform a polymerization reaction, which enables effective suppression of the foaming of a polymerization reaction liquid. The method of producing a polycarboxylic acid-based polymer of the present invention is a method of producing a polycarboxylic acid-based polymer, the method including adding a monomer composition containing an unsaturated monocarboxylic acid-based monomer and/or an unsaturated dicarboxylic acid-based monomer to a reaction vessel to perform a polymerization reaction, the method further including adding a defoaming agent by a time when 100 mass % of a total amount of the monomer composition is added.

Abstract: An object of the present invention is to provide an aqueous poly(meth)acrylic acid (salt) solution having high dispersibility of inorganic substances and demonstrating dispersibility having sufficient stability over time, and a process for preparing the same. The present invention relates to an aqueous poly(meth)acrylic acid (salt) solution comprising a poly(meth)acrylic acid (salt) having a weight average molecular weight of 1000 to 10000 polymerized in the presence of a phosphorus compound containing hypophosphorous acid (salt), wherein the phosphorus compound contains 0 to 0.3% by mass of a phosphorous acid (salt) based on 100% by mass of the phosphorus compound, and the aqueous poly(meth)acrylic acid (salt) solution contains 0 to 10000 ppm of an inorganic anion and a process for the preparation thereof.

Abstract: An aqueous solution containing a poly(meth)acrylic acid-based polymer which shows excellent dispersibility for inorganic substances, satisfactory long-term dispersibility, and a favorable color is provided.

Abstract: The present invention provides a method for efficiently producing a sulfonic acid group-containing ether compound having a high purity and a good polymerizability while preventing production of a byproduct, and provides a sulfonic acid group-containing ether compound containing fewer impurities and having a good radical (co)polymerizability. The present invention provides a method of producing a sulfonic acid group-containing ether compound by reacting a sulfurous acid compound with a compound represented by the formula (1): wherein R1 represents a single bond, a CH2 group, or a CH2CH2 group, and R2 represents H, or a CH3 group, the method comprising the steps of: adjusting pH of a reaction system to 5.5 or greater with use of an alkaline substance; and adding the compound represented by the formula (1) to a reaction vessel containing the sulfurous acid compound.

Abstract: The present invention provides a method for efficiently producing a sulfonic acid group-containing ether compound having a high purity and a good polymerizability while preventing production of a byproduct, and provides a sulfonic acid group-containing ether compound containing fewer impurities and having a good radical (co)polymerizability. The present invention provides a method of producing a sulfonic acid group-containing ether compound by reacting a sulfurous acid compound with a compound represented by the formula (1): wherein R1 represents a single bond, a CH2 group, or a CH2CH2 group, and R2 represents H, or a CH3 group, the method comprising the steps of: adjusting pH of a reaction system to 5.5 or greater with use of an alkaline substance; and adding the compound represented by the formula (1) to a reaction vessel containing the sulfurous acid compound.

Abstract: The present invention provides a method for efficiently producing a sulfonic acid group-containing ether compound having a high purity and a good polymerizability while preventing production of a byproduct, and provides a sulfonic acid group-containing ether compound containing fewer impurities and having a good radical (co)polymerizability. The present invention provides a method of producing a sulfonic acid group-containing ether compound by reacting a sulfurous acid compound with a compound represented by the formula (1): wherein R1 represents a single bond, a CH2 group, or a CH2CH2 group, and R2 represents H, or a CH3 group, the method comprising the steps of: adjusting pH of a reaction system to 5.5 or greater with use of an alkaline substance; and adding the compound represented by the formula (1) to a reaction vessel containing the sulfurous acid compound.

Abstract: An object of the present invention is to provide an aqueous poly(meth)acrylic acid (salt) solution having high dispersibility of inorganic substances and demonstrating dispersibility having sufficient stability over time, and a process for preparing the same. The present invention relates to an aqueous poly(meth)acrylic acid (salt) solution comprising a poly(meth)acrylic acid (salt) having a weight average molecular weight of 1000 to 10000 polymerized in the presence of a phosphorus compound containing hypophosphorous acid (salt), wherein the phosphorus compound contains 0 to 0.

Abstract: An aqueous solution containing a poly(meth)acrylic acid-based polymer which shows excellent dispersibility for inorganic substances, satisfactory long-term dispersibility, and a favorable color is provided.

Abstract: The present invention provides a method for efficiently producing a sulfonic acid group-containing ether compound having a high purity and a good polymerizability while preventing production of a byproduct, and provides a sulfonic acid group-containing ether compound containing fewer impurities and having a good radical (co)polymerizability. The present invention provides a method of producing a sulfonic acid group-containing ether compound by reacting a sulfurous acid compound with a compound represented by the formula (1): wherein R1 represents a single bond, a CH2 group, or a CH2CH2 group, and R2 represents H, or a CH3 group, the method comprising the steps of: adjusting pH of a reaction system to 5.5 or greater with use of an alkaline substance; and adding the compound represented by the formula (1) to a reaction vessel containing the sulfurous acid compound.

Abstract: An object of the present invention is to provide: a water-soluble polymer which can exercise a high calcium-ion-binding ability and a high clay dispersibility even under circumstances where high-hardness water is used; and a process for producing such a water-soluble polymer with ease and good productivity. As a means of achieving this object, the water-soluble polymer according to the present invention has: (1) a calcium-ion-binding ability of not less than 470 mgCaCO3/g and further a clay dispersibility of not less than 0.90 in a test liquid having a calcium concentration of 50 ppm in terms of calcium carbonate; or (2) a calcium-ion-binding ability of not less than 430 mgCaCO3/g and further a clay dispersibility of not less than 0.70 in a test liquid having a calcium concentration of 100 ppm in terms of calcium carbonate.

Abstract: The present invention provides a detergent and fabric care additive containing a high molecular weight carboxylic acid polymer excellent in solubility in the use of a fabric treatment product such as a detergent and fabric care additive. A detergent and fabric care additive containing a carboxylic acid polymer powder, wherein the carboxylic acid polymer powder satisfies the following conditions (a) and (b) [(a) at least one of conditions that a 0.2% by weight aqueous solution has a viscosity of 10 mPa·s or higher and that a 1% by weight aqueous solution has pH lower than 6 and a 10% by weight aqueous solution has a viscosity of 300 mPa·s or higher and (b) at least one of conditions that 50% by weight or more of the carboxylic acid polymer powder passes through 20 mesh of a sieve according to JIS (Z8801) and that the average particle diameter is 600 ?m or smaller].

Abstract: An object of the present invention is to provide a polyalkylenimine-derived polymer and its production process and uses, wherein the polyalkylenimine-derived polymer can efficiently disperse such as liquid (particularly, water-soluble) dirt and dyes and can exercise excellent performances in uses for such as detergents and water-treating agents. As a means of achieving this object, a polyalkylenimine-derived polymer according to the present invention is an addition product of a carboxyalkyl group to a polyalkylenimine chain and is in the range of 30,000 to 5,000,000 in weight-average molecular weight.

Abstract: An object of the present invention is to provide a polymer which is suitable as a detergent builder in that it exerts an excellent detergency and it has no adverse effect on the environment, and is suitable as a cement admixture in that it is excellent in cement dispersibility, and workability is better.

Abstract: The present invention provides a production process for a terminal-end-stabilized glyoxylic acid (salt)-based polymer, which process enables to reduce the amount of the polymerization solvent, as recovered or removed after the end of the polymerization (before the start of the hydrolysis) or after the end of the hydrolysis, without lowering the production efficiency. The production process for a terminal-end-stabilized glyoxylic acid (salt)-based polymer comprises the step of polymerizing a monomer component including a glyoxylic acid ester in order to produce the terminal-end-stabilized glyoxylic acid (salt)-based polymer, wherein a terminal end stabilizer is used as a reaction medium of the polymerization.

Abstract: The present invention provides a production process for a terminal-end-stabilized glyoxylic acid (salt)-based polymer, which process enables to reduce the amount of the polymerization solvent, as recovered or removed after the end of the polymerization (before the start of the hydrolysis) or after the end of the hydrolysis, without lowering the production efficiency. The production process for a terminal-end-stabilized glyoxylic acid (salt)-based polymer comprises the step of polymerizing a monomer component including a glyoxylic acid ester in order to produce the terminal-end-stabilized glyoxylic acid (salt)-based polymer, wherein a terminal end stabilizer is used as a reaction medium of the polymerization.