TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The vinyl-type monomer is carboxylic acid vinyl monomer. The electroconductive composition comprises electrolyte having group derived from cation chosen from alkali metal, alkaline-earth metal, lithium and tetraalkylammonium. The vinylsilane-type monomer is vinyl alkyl dialkoxysilane, ( gamma )-(meta) acryloxypropyl trialkoxysilane, ( gamma )-(meta) acryloxypropyl alkyl dialkoxysilane or vinyl tris(( beta )-methoxyethoxy)silane. The polycarboxylic acid is citric acid, butane tetracarboxylic acid, 3,3',4,4'-biphenyl tetracarboxylic acid, hexahydrophthalic acid, 3,3',4,4'-diphenylsulfone tetracarboxylic acid, methyl bicyclo(2.2.1)heptane-2,3-dicarboxylic acid, bicyclo(2.2.1)heptane-2,3-dicarboxylic acid, aspartic acid, pyromellitic acid, mellitic acid, phosphorus-containing ester-group tetracarboxylic acid, phenyl ethynyl phthalic acid, oxydiphthalic acid and/or their acid anhydride, ethylene glycol bisanhydro trimellitate, 1,3,3a,4,5,9b-hexahydro-5-(tetrahydro-2,5-dioxo-3-furanyl)naphtho(1,2-c)furan-1,3-dione, glycerol bisanhydro trimellitate monoacetate and/or ethylene glycol bisanhydro trimellitate. Preferred Property: The molecular weight of polycarboxylic acid is 1000 or less.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The vinyl carboxylate copolymer is copolymer of carboxylic acid vinyl monomer and vinylsilane-type monomer. The electroconductive composition further contains coupling agent chosen from titanium-type coupling agent and silane coupling agent. Preferred Definitions:    X=single bond, or 6C alkylene, alkenylene, alkynylene, phenylene or naphthylene (all optionally substituted by fluoro, -CH2OCH2-, -(OCH2)m', -(CH2O)m'CH2-, -CO-, -COCO-, -CO(CH2)m'CO-, -CO(C6H4)CO-, -S-, -CS-, -SO-, -SO2-, -NR-, -CONR-, -NRCO-, CSNR-, -NRCS-, -NRNR- or -HPO4-);    R=H or 6C or less alkylene;    m'=natural number;    V'=unit derived from vinyl-type monomer having active hydrogen group chosen from hydroxy, carboxy, amino, -NHR6, hydrazide, R7R8NN(R9)C(=O)R10, hydroxyamino, sulfo and thiol;and    R6-R10=H, 1-8C alkyl, hydroxy, acyl, carboxy, amino, vinyl, allyl, aryl, halo or metal.