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: 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 is a powder of a vinylpyrrolidone polymer having a K value of smaller than 50, characterized in that a content of particles having a particle diameter of 106 ?m or smaller is 10% by mass or less and a content of particles having a particle diameter of greater than 1,000 ?m is 5% by mass or lower. A process for production of a powder of a vinylpyrrolidone polymer according to the present invention is characterized in that a vinylpyrrolidone polymer having a K value of smaller than 50 is formed into a solution having a concentration from 30% to 70% by mass, and the solution is dried by using a hot surface adhesion-type dryer, followed by pulverization so that a content of particles having a particle diameter of 106 ?m or smaller is 10% by mass or lower and a content of particles having a particle diameter of greater than 1,000 ?m is 5% by mass or lower.

Abstract: A hydrophilic graft polymer having the reducing amount of the residual unsaturated monocarboxylic acid, and having very excellent temporal stability is provided. The present invention relates to the hydrophilic graft polymer obtained by graft polymerization of monomer component containing unsaturated monocarboxylic acid onto polyalkylene oxide, wherein mole ratio of side chain moiety derived from the unsaturated monocarboxylic acid is more than 90% by mole relative to total side chain, and residual amount of unsaturated monocarboxylic acid is less than 200 ppm by mass relative to the total mass of said hydrophilic graft polymer.

Abstract: A hydrophilic graft polymer having the reducing amount of the residual unsaturated monocarboxylic acid, and having very excellent temporal stability is provided. The present invention relates to the hydrophilic graft polymer obtained by graft polymerization of monomer component containing unsaturated monocarboxylic acid onto polyalkylene oxide, wherein mole ratio of side chain moiety derived from the unsaturated monocarboxylic acid is more than 90% by mole relative to total side chain, and residual amount of unsaturated monocarboxylic acid is less than 200 ppm by mass relative to the total mass of said hydrophilic graft polymer.

Abstract: The present invention is a powder of a vinylpyrrolidone polymer having a K value of smaller than 50, characterized in that a content of particles having a particle diameter of 106 ?m or smaller is 10% by mass or less and a content of particles having a particle diameter of greater than 1,000 ?m is 5% by mass or lower. A process for production of a powder of a vinylpyrrolidone polymer according to the present invention is characterized in that a vinylpyrrolidone polymer having a K value of smaller than 50 is formed into a solution having a concentration from 30% to 70% by mass, and the solution is dried by using a hot surface adhesion-type dryer, followed by pulverization so that a content of particles having a particle diameter of 106 ?m or smaller is 10% by mass or lower and a content of particles having a particle diameter of greater than 1,000 ?m is 5% by mass or lower.

Abstract: It is an object of the present invention to provide a hydraulic composition which enables both of high fluidity and material separation reducing and can eliminate the delay of setting. The present invention is directed to a hydraulic composition comprising cement (A), a copolymer (B), a high-performance water reducing agent (C) and a powdery cement admixture (D), wherein the copolymer (B) comprises a repeating unit (I) represented by the following formula (1); (wherein R1 represents a hydrogen atom or a methyl group. n is an integer of 2 to 4.), and a repeating unit (II) represented by the following general formula (2); (wherein R2, R3 and R4 are same or different and each represents a hydrogen atom, a methyl group or a (CH2)pCOOM2 group, and may form a structure of an anhydride when the total number of COOM1 groups and COOM2 groups are 2.

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 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: It is an object of the present invention to provide a hydraulic composition which enables both of high fluidity and material separation reducing and can eliminate the delay of setting. The present invention is directed to a hydraulic composition comprising cement (A), a copolymer (B), a high-performance water reducing agent (C) and a powdery cement admixture (D), wherein the copolymer (B) comprises a repeating unit (I) represented by the following formula (1); (wherein R1 represents a hydrogen atom or a methyl group. n is an integer of 2 to 4.), and a repeating unit (II) represented by the following general formula (2); (wherein R2, R3 and R4 are same or different and each represents a hydrogen atom, a methyl group or a (CH2)pCOOM2 group, and may form a structure of an anhydride when the total number of COOM1 groups and COOM2 groups are 2.

Abstract: The present invention provides: an ink jet recording material which displays sufficient water resistance and further, excellent definition of initial images; and a coating agent therefor to give such an ink jet recording material. A first coating agent for ink jet recording materials, according to the present invention, comprises: an aqueous polymer having a carboxyl group; and a water-soluble polymer having an oxazoline group as a crosslinking agent. A second coating agent for ink jet recording materials, according to the present invention, comprises a polymer and a crosslinking agent, wherein the polymer has both a structural unit, as formed by ring-opening polymerization of an oxazoline compound, and a carboxyl group.

Abstract: This invention concerns a novel organic sulfide compound obtained by the reaction of a mercapto alkanol such as 2-mercapto ethanol with an unsaturated amide such as (meth)acrylamide, maleic acid diamide, or fumaric acid diamide and a method for the production of the organic sulfide compound. The invention enables novel organic sulfide compounds of great commercial utility to be obtained with a high yield on a commercial scale.

Abstract: In order to manufacture a thiol compound by causing reaction between an unsaturated compound and hydrogen sulfide, the unsaturated compound and the thiol compound being expressed by following formulas (1) and (2), respectively:CH.sub.2 .dbd.CR.sup.1 --COOR.sup.2 (1)HS--CH.sub.2 --CHR.sup.1 --COOR.sup.2 (2)where R.sup.1 represents a hydrogen atom or a methyl group, and R.sup.

Abstract: A process for producing an alkylene sulfide, which comprises the step of subjecting a mercaptoalkanol to an intramolecular dehydration reaction in the presence of an acidic dehydration catalyst, to produce the alkylene sulfide, in which the intramolecular dehydration reaction is conducted under at least one conditions of (1) to (3). (1) The intramolecular dehydration reaction is conducted in at least one solvent selected from the group consisting of compounds having an amide group N-substituted with a hydrocarbon group having from 1 to 6 carbon atoms, compounds having an unsubstituted amide group, compounds having a ureylene group N-substituted with a hydrocarbon group having from 1 to 6 carbon atoms, and compounds having an unsubstituted ureylene group. (2) The intramolecular dehydration reaction is conducted in a solvent under such temperature and pressure conditions that the reaction temperature T (.degree.C.) and the boiling point tb (.degree.C.