| abstract |
The present invention relates to an electric or electronic device having a polyimide insulating film formed of repeating units of the formula:n n wherein R is a bivalent organic group selected from the group consisting of a bivalent organic group derived from a diamine selected from the group consisting of p-phenylenediamine, m-phenylenediamine, diaminodiphenylmethane, diaminodiphenyl ether, 2,2-diaminodiphenylpropane, diaminodiphenylsulfone, diaminobenzophenone, diaminonaphthalene, 1,3-bis(4-aminophenoxy) benzene, 1,4-bis(4-aminophenoxy)benzene, 4,4'-di(4-aminophenoxy) diphenylsulfone, 2,2'-bis[4-(4-aminophenoxy)phenyl]propane, and mixtures thereof. |