Patent ID: 8614051

Claim:
A photosensitive resin composition for an interlayer insulating film or a protective film of a substrate for circuit formation, wherein the photosensitive resin composition comprises: a polymer (a) having a structural unit shown by the formula (A), wherein R 1 is a trivalent or tetravalent organic group, R 2 is a structure shown by the following formulas (2) or (3), wherein a plurality of R 4 s are independently a fluorine atom or a monovalent organic group having 1 to 10 carbon atoms that may have an oxygen atom, a sulfur atom or a halogen atom, and m and n are independently an integer of 0 to 4, R is a monovalent organic group having a carbon-carbon unsaturated double bond or a group shown by O − M + , in which M + is a hydrogen ion or an ion of a compound having a carbon-carbon unsaturated double bond, and at least one of Rs is a monovalent organic group having a carbon-carbon unsaturated double bond or a group shown by O − M + , in which M + is an ion of a compound having a carbon-carbon unsaturated double bond, and n is 1 or 2; and a compound (b) that generates a radical when irradiated with active rays and that has a structure shown by the following formula (B), wherein R 3 is a monovalent aromatic or heterocyclic ring that may have a substituent.