Polyamic acid and polyimide, processes for the production of same, compositions containing same, and uses thereof

A process for producing a polyimide comprising:

• reacting together 1,4-bis(aminomethyl)cyclohexane and at least two different tetracarboxylic dianhydrides each represented by formula (3) and having different R, to thereby obtain a polyamic acid,
• wherein a content of a trans isomer of the 1,4-bis(aminomethyl)cyclohexane represented by formula (Y1) is 63% to 91%, and a content of a cis isomer of the 1,4-bis(aminomethyl)cyclohexane represented by formula (Y2) is 9% to 37%, with respect to the total content of the cis and trans isomers being 100%,
• where the at least two different repeating units include a repeating unit having R represented by the following formula (R1) and a repeating unit having R represented by the following formula (R2),
• where —Y— represents a single bond, and
• thermally or chemically imidizing the polyamic acid.