Patent ID: 8133550

Claim:
A photosensitive resin composition comprising: a photosensitizer; and a polybenzoxazole precursor represented by the following formula (1): wherein R 3 a′ and R 3 b′ may be the same or different, and each of them represents a hydrogen atom or a phenyl group; X 1 represents a group represented by formula (2) or (3): X 2 represents a divalent aromatic group, heterocyclic group, alicyclic group, or aliphatic group, each of which may contain a silicon atom; X 3 represents a tetravalent aromatic group, aliphatic group, heterocyclic group, or mixed group thereof; Ra and Rb each independently represents a hydrogen atom, an alkyl group, an acyl group, SO 2 Rc, a group capable of leaving by the action of an acid, or —C(R 3 ) 2 —COOR 4 ; Rc represents an alkyl group, an aryl group, or an alicyclic group; R 3 represents a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms; R 4 represents a group capable of leaving by the action of an acid; Y 1 represents a divalent aromatic group, aliphatic group, heterocyclic group, or mixed group thereof; each groups represented by X 1 , X 2 , X 3 , Y 1 , Ra, Rb, Rc, R 3 and R 4 may be the same or different; and m represents an integer of from 3 to 1,000, wherein at least one of the groups represented by X 1 and the groups represented by Y 1 in the formula (1) comprises a structure represented by the following formula (A2-2): wherein M represents a single bond or a divalent group; R 21 and R 22 each independently represents a fluorine atom or a univalent organic group; r and s each independently represents an integer of from 1 to 4; and the addition amount of the polybenzoxazole precursor is from 50 to 99.5 mass % based on the total solids content of the photosensitive resin composition.