BINDER COMPOSITION FOR SECONDARY BATTERY POROUS MEMBRANE, SLURRY FOR SECONDARY BATTERY POROUS MEMBRANE, POROUS MEMBRANE FOR SECONDARY BATTERY, AND SECONDARY BATTERY

摘要

Provided is a binder composition that is for a secondary battery porous membrane, that comprises polycarboxylic acid and water, and wherein: the polycarboxylic acid contains 20-50 mass% of a carboxylic acid group-containing monomer unit; the polycarboxylic acid is water-insoluble at a pH of 6.5 or less and water-soluble at a pH of 8 or more; and the pH of the binder composition for a secondary battery porous membrane is 6.5 or less. Also provided are a slurry for a secondary porous battery membrane, a porous membrane for a secondary battery, and a secondary battery that use the binder composition.