Patent ID: 8765868

Claim:
A resin composition for an insulating film or a surface protection film of an electronic part, the resin composition comprising: (A) a polymer that has a structural unit shown by the following formula (I), wherein X 1 is a di- to octa-valent organic group, Y 1 is a di- to octa-valent organic group, R 1 is a hydrogen atom or an organic group having 1 to 20 carbon atoms, R 2 is a hydrogen atom, and when plural R 1 s or R 2 s exist, the plural R 1 s or R 2 s may be the same or different, p and q are independently an integer of 0 to 4, l and m are independently an integer of 0 to 2, and n is an integer of 2 or more that indicates the number of the structural units, and the polymer has an acidic functional group at both of the terminals, wherein the acidic functional group is —COOR 10 or —OR 20 , wherein R 10 is a hydrogen atom or an organic group having 1 to 20 carbon atoms, wherein R 20 is a hydrogen atom or a monovalent organic group or any of structures represented by the following formula (III), wherein R 4 is a monovalent organic group, wherein Z is an oxygen atom, a sulfur atom or a nitrogen atom, and when Z is an oxygen atom or a sulfur atom, n is 1, and when Z is a nitrogen atom, n is 2, wherein R 5 is an aliphatic group or an aromatic group which has a linear, branched or cyclic structure; (B) a solvent; and (C) a compound shown by the following formula (II), wherein R 3 is a monovalent organic group.