Conductive material mixed composition

A process of producing a conductive material mixed composition comprising the step of synthesizing a piperidyl group-containing high-molecular-weight polymer or copolymer that is composed of the constitutional unit represented by general formula (1) below and insoluble in tetrahydrofuran (THF) by polymerization in a solvent so that the synthesized polymer or copolymer is dissolved in the solvent, and immediately followed by mixing a conductive material with the polymer or copolymer dissolved in the solvent to form a homogeneous mixture:

• wherein R1 represents a hydrogen atom, a hydroxyl group, an oxyl radical, an alkyl group having 1 to 18 carbon atoms, or an alkoxy group having 1 to 18 carbon atoms;
• R2 and R3 each independently represent a hydrogen atom or a methyl group;
• R4 represents a hydrogen atom, an alkali metal atom, an alkyl group having 1 to 50 carbon atoms, an alkenyl group having 1 to 50 carbon atoms, an aralkyl group having 1 to 50 carbon atoms, or a haloalkyl group having 1 to 50 carbon atoms;
• n represents a number of 30 or greater;
• and m represents 0 or a positive number.