The purpose of the present invention is to provide a viscous composition which is capable of achieving a high viscosity over a pH range from acidic to weakly acidic conditions even in the presence of a polyvalent metal salt by means of an alkyl-modified carboxyl group-containing water-soluble copolymer. A viscous composition, which is obtained by adjusting the pH of a liquid composition that contains a specific alkyl-modified carboxyl group-containing water-soluble copolymer, a polyvalent metal salt and water to 7.0 or more with use of a base, and then adjusting the pH of the resulting liquid composition to 2.5 - 6.5 with use of a carboxylic acid and/or a phosphorus oxo acid, is able to have a high viscosity.
本发明的目的是提供一种粘稠组合物,该组合物通过含烷基改性羧基的
水溶性共聚物,即使在有多价
金属盐存在的情况下,也能在酸性到弱酸性的pH值范围内达到高粘度。通过使用碱将含有特定烷基改性含羧基
水溶性共聚物、多价
金属盐和
水的液体组合物的 pH 值调至 7.0 或以上,然后使用
羧酸和/或氧化
磷酸将所得液体组合物的 pH 值调至 2.5 - 6.5,可获得高粘度组合物。