AQUEOUS COMPOSITIONS FOR SECONDARY BATTERIES STABILIZED AGAINST VISCOSITY CHANGES UPON STORAGE

The present invention provides a method that enables the use of an aqueous solution of a copolymer of vinyl alcohol and an alkali metal neutralized product of ethylenically unsaturated carboxylic acid or carboxymethyl cellulose or a salt thereof, as a binder for secondary batteries, without causing a significant viscosity increase even if stored in the state of an aqueous solution. More specifically, the present invention provides a composition in the form of an aqueous solution containing a copolymer of vinyl alcohol and an alkali metal neutralized product of ethylenically unsaturated carboxylic acid and/or carboxymethyl cellulose or a salt thereof, wherein when the viscosity of the composition after being diluted with water (25°C or less) to a viscosity of 200 ± 100 mPa·s at room temperature (25°C) and being adjusted to a temperature of 25°C is defined as Xa1 (Pa·s), and the viscosity of the composition after being placed in an airtight container and being allowed to stand at 95°C for 8 hours is defined as Xb1 (Pa·s), the change rate obtained by the following formula: Changerate%=Xa1−Xb1/Xb1×100 is 0 to 10%.