Patent ID: 8859186

Claim:
A polyimide precursor comprising repeating units represented by the following formula (1) of 100 mole % in all the repeating units: wherein R 1 is a tetravalent organic group; R 2 is a divalent organic group; R 1 s may be the same or different from each other and R 2 s may be the same or different from each other in the repeating units; R 3 and R 4 each independently represent a monovalent organic group having a structure represented by the following formula (2) and may be the same or different from each other; R 3 s may be the same or different from each other and R 4 s may be the same or different from each other in the repeating units; and n is the number of the repeating units: wherein R 5 , R 6 and R 7 each independently represent a hydrogen atom, a halogen atom or a monovalent organic group; R 8 is a monovalent organic group which is a mixture consisting of A1 and A2; A1 and A3; or A1, A2 and A3, wherein A1 is a group consisting of organic groups in which the carbon atom bonded at R 8 to the oxygen atom is a primary carbon atom; A2 is a group consisting of organic groups in which the carbon atom bonded at R 8 to the oxygen atom is a secondary carbon atom; and A3 is a group of organic groups in which the carbon atom bonded at R 8 to the oxygen atom is a tertiary carbon atom, R 8 s may be the same or different from each other in the repeating units; 35 mole % or less of R 8 s are organic groups having a reactive group selected from the group consisting of an ethylenic unsaturated bond, a glycidyl group, an oxetanyl group, and an isocyanuric group; and R 5 , R 6 , R 7 and R 8 may be bonded to each other to form a ring structure.