In the process of the present invention, a solvent-soluble polyimide is
produced by polycondensing at least one tetracarboxylic acid component
with at least one diamine component in a solvent in the presence of a
tertiary amine. The tetracarboxylic acid component is selected from the
group consisting of tetracarboxylic dianhydrides represented by the
following formula 1: ##STR00001## wherein R is as defined in the
specification, and tetracarboxylic acids and their derivatives
represented by the following formula 2: ##STR00002## wherein R and
Y.sup.1 to Y.sup.4 are as defined in the specification. Unlike the
conventional techniques using an excessively large amount of a chemical
imidation agent such as acetic anhydride and a chemical imidation
catalyst such as triethylamine, in the process of the present invention,
the solvent-soluble polyimide having a high polymerization degree is
easily produced in a solvent with good productivity by using only a
catalytic amount of the tertiary amine.