Abstract: A polymer having an isoindole structure represented by the following general formula: ##STR1##wherein R.sup.1, R.sup.2 and R.sup.3 independently represent a hydrogen atom or a hydrocarbon group having 1 to 5 carbon atoms, X.sup.- represents an anion of an electrolyte, y is a number of from 0.01 to 1, which indicates the proportion of the anion to 1 mole of the monomer, and n is a number of from 5 to 500, which indicates the degree of polymerization,shows a high electroconductivity when doped, and the stability of the polymer in the oxidized state is high. This polymer is obtained by subjecting an isoindole compound represented by the following general formula: ##STR2## wherein R.sup.1, R.sup.2 and R.sup.3 are as defined above, to (1) electrochemical polymerization in the presence of an electrolyte in a solvent or (2) oxidative polymerization in a solvent by the action of an oxidant.

Abstract: A polymer having an isoindole structure represented by the following general formula: ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 independently represent a hydrogen atom or a hydrocarbon group having 1 to 5 carbon atoms X.sup.- represents an anion of an electrolyte, y is a number of from 0.01 to 1, which indicates the proportion of the anion to 1 mole of the monomer, and n is a number of from 5 to 500, which indicates the degree of polymerization,shows a high electroconductivity when doped, and the stability of the polymer in the oxidized state is high. This polymer is obtained by subjecting an isoindole compound represented by the following general formula: ##STR2## wherein R.sup.1, R.sup.2 and R.sup.3 are as defined above, to (1) electrochemical polymerization in the presence of an electrolyte in a solvent or (2) oxidative polymerization in a solvent by the action of an oxidant.