Abstract: Provided is a viscous composition that does not lose its ease of handling even after long-term storage and is easily returned to a uniform composition even if layer separation occurs, despite containing a high concentration of a partially neutralized product of a polymer containing ethylenically unsaturated carboxylic acid units. More specifically, provided is a viscous composition comprising (A) 10 to 40 mass % of a partially neutralized product of a polymer containing ethylenically unsaturated carboxylic acid units, (B) 0 to 50 mass %, of glycerol, (C) 5 to 65 mass % of a dihydric alcohol, and (D) 0 to 20 mass % of water, the total of the components (B) and (C) being 40 mass % or more, the mass ratio of the total of the components (B) and (C) to the component (A), ((B)+(C))/(A), being 1.5 or more.

Abstract: Provided is a technique for preparing an excellent viscous composition with a pH of about 4 to 5.5 by using a copolymer obtained by polymerizing a (meth)acrylic acid, a (meth)acrylic acid alkyl ester having an alkyl group with 10 to 30 carbon atoms, and additionally, a compound with two or more ethylenically unsaturated groups. More specifically, provided is, for example, a viscous composition comprising (A) a copolymer obtained by polymerizing 100 parts by mass of a (meth)acrylic acid, 0.5 to 5 parts by mass of a (meth)acrylic acid alkyl ester having an alkyl group with 10 to 30 carbon atoms, and 0.001 to 0.2 parts by mass of a compound with two or more ethylenically unsaturated groups, (B) a carboxylic acid metal salt, and (C) a carboxylic acid; and having a pH of 4 to 5.5, and a viscosity of 1000 to 50000 mPa·s.

Abstract: Provided is a viscous composition that comprises a carboxyl-group-containing water-soluble copolymer, the composition having excellent viscosity even when an amino acid-based surfactant is contained in an amount greater than that of betaine. More specifically, provided is a viscous composition comprising (A) a copolymer obtained by polymerizing at least 100 parts by mass of a (meth)acrylic acid and 0.5 to 5 parts by mass of a (meth)acrylic acid alkyl ester having an alkyl group with 10 to 30 carbon atoms, (B) an amino acid-based surfactant, (C) a betaine, (D) an alkyl glycoside, and (E) an organic acid salt, wherein the mass content of (B) is equal to or greater than the mass content of (C).

Abstract: Provided is an aqueous dispersion composition that comprises a carboxyl-group-containing water-soluble copolymer in a relatively high concentration, but has intact handleability. More specifically, provided is, for example, an aqueous dispersion composition comprising 4 to 8 mass % of a copolymer obtained by polymerization in the presence of a nonionic surfactant with one or more polyoxyethylene chains, the copolymer being at least one member selected from the group consisting of (1) copolymers obtained by polymerizing the following (i) and (ii), (2) copolymers obtained by polymerizing the following (i) and (iii), and (3) copolymers obtained by polymerizing the following (i), (ii), and (iii): (i) 100 parts by mass of a (meth)acrylic acid; (ii) 0.001 to 1 part by mass of a compound with two or more ethylenically unsaturated groups; and (iii) 0.5 to 5 parts by mass of a (meth)acrylic acid alkyl ester having an alkyl group with 10 to 30 carbon atoms.