| 摘要 |
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. The aqueous solution of the present invention is an aqueous solution comprising a poly(meth)acrylic acid-based polymer, the poly(meth)acrylic acid-based polymer including carboxyl groups, wherein in 100 mol % of the carboxyl groups, 30 to 85 mol % of the carboxyl groups are in an alkali metal salt form of the carboxyl groups, and 15 to 70 mol % of the carboxyl groups are in an acid form of the carboxyl groups, the poly(meth)acrylic acid-based polymer containing a phosphorus-containing group, the poly(meth)acrylic acid-based polymer having a weight average molecular weight of 2000 to 9000, the aqueous poly(meth)acrylic acid-based polymer solution having a concentration of inorganic anions, each including a sulfur or phosphorus atom, of 1000 to 10000 ppm relative to the aqueous poly(meth)acrylic acid-based polymer solution. |
