Patent ID: 7771559

Claim:
A method for connecting electrodes comprising: interposing a layer containing polyphthalide as a pressure-sensitive electrically conductive polymer, which is electrically conductive upon application of pressure thereto, at least partially between two electrodes opposed to each other; and applying a pressure in a thickness direction between the electrodes to fix the both electrodes, whereby the polyphthalide polymer becomes electrically conductive in the thickness direction between the electrodes when said pressure is applied, wherein the polyphthalide is represented by the formula (I): wherein R represents a divalent aromatic hydrocarbon group or a divalent heteroring-containing aromatic group, R 1 represents an alky group, a fluorinated alkyl group, an alkoxy group or a halogen atom, where the number of R 1 is 0 to 4, X represents O or N—R 3 , provided that R 3 represents one of the following groups, Y represents SO 2 or CO and n represents a number of repeating units in the polymer.