NOVELTY - A binder composition contains cross-linked type emulsion emulsion formed by emulsion-polymerization of epoxy group-containing ethylenically unsaturated monomer, alkoxy silyl group-containing ethylenically unsaturated monomer, and carboxyl group-containing ethylenically unsaturated monomer, tertiary-butyl group-containing ethylenically unsaturated monomer, sulfonic acid group-containing ethylenically unsaturated monomer and/or phosphoric acid group-containing ethylenically unsaturated monomer, and other ethylenically unsaturated monomer.    USE - Binder composition is used for electrode of electrical double layer capacitor (both claimed). Uses include but are not limited to nickel hydride secondary battery and lithium ion secondary battery for electronic device, and electrical double-layer capacitor for hybrid vehicle and fuel cell vehicle.    ADVANTAGE - The binder composition has excellent flexibility and adhesiveness with collector. The electrical double layer capacitor comprising binder composition has high capacitance and charging/discharging cycling characteristics, even at high temperature environment.    DETAILED DESCRIPTION - A binder composition contains cross-linked type emulsion emulsion formed by emulsion-polymerization of epoxy group-containing ethylenically unsaturated monomer (a) and/or amide group-containing ethylenically unsaturated monomer (b) (0.1-20 weight%), alkoxy silyl group-containing ethylenically unsaturated monomer (c) and/or N-methylol group-containing ethylenically unsaturated monomer (d) (0.1-5 weight%), carboxyl group-containing ethylenically unsaturated monomer (e), tertiary-butyl group-containing ethylenically unsaturated monomer (f), sulfonic acid group-containing ethylenically unsaturated monomer (g) and/or phosphoric acid group-containing ethylenically unsaturated monomer (h) (0.1-10 weight%), and ethylenically unsaturated monomer (i) other than monomers (a-h). INDEPENDENT CLAIMS are included for the following:    (1) electrode; and    (2) electrical double layer capacitor.