| abstract |
It contains an electrode active material, a water-insoluble polymer (A), and a water-soluble polymer (B), and a water-insoluble polymer (A) is 20 weight%-60 weight% of an (a1) aliphatic conjugated diene monomeric unit, (a2) ethylenically unsaturated carbon 0.5 wt% to 10 wt% of the acid monomer unit, and (a3) 30 wt% to 79.5 wt% of the monomer unit copolymerizable with these, and the water-soluble polymer (B) is (b1) an ethylenically unsaturated carboxylic monomer 20 weight%-60 weight% of a unit, (b2) 25 weight%-78 weight% of a (meth) acrylic acid ester monomeric unit, and (b3) 2 weight%-15 weight% of the sulfonic acid group containing monomeric unit copolymerizable with these, The ratio (A) / (B) of the water-insoluble polymer (A) and the water-soluble polymer (B) is 80/20 to 95/5. |