Storage method and usage method for polycarboxylic acid-based polymer solution

Abstract

The present invention provides a method for storing a polycarboxylic acid copolymer solution capable of preventing or reducing cloudiness and an increase in viscosity of a polycarboxylic acid copolymer solution after storage. The present invention relates to the method for storing a solution of a polycarboxylic acid polymer, the polycarboxylic acid polymer having a weight-average molecular weight of 1,000 to 20,000 and a degree of neutralization of 15 mol % or lower based on 100 mol % of a total of carboxyl groups and salts thereof in the polycarboxylic acid polymer, the polycarboxylic acid polymer containing a structural unit derived from an unsaturated carboxylic acid monomer in a content of 85 to 100 mol % based on 100 mol % of structural units derived from all monomers, the storage method comprising storing at 40° C. or higher.

Dependencies are inferred from the claim text.