Patent ID: 8470959

Claim:
A polyimide compound consisting of a tetracarboxylic dianhydride, a trifunctional alkylamine and a bifunctional amine, the polyimide compound having a structural unit represented by the following general formula (1): wherein X is a covalent single bond, —CH 2 —, —C(CF 3 ) 2 — or —CR(R′)— (wherein R and R′, which may be the same or different, are each a C 1 to C 6 alkyl group or an aryl group); A and B, which may be the same or different, are substituents each selected from a hydroxyl group, a halogen group and a C 1 to C 4 alkyl group; a and b, which are the numbers of the substituents A and B, respectively, are each 0 or an integer of 1 or 2; and o, p and q are each an integer of 1 to 5, wherein the structural unit is present in a proportion ranging from not less than 3 mol % and less than 10 mol %.