Alkali-developable photosensitive resin composition and β-diketone compound

An alkali developable photosensitive resin composition, comprising a photopolymerizable unsaturated compound having a structure resulting from:

• an addition reaction of a compound having a β-diketone moiety or a compound having a β-ketoester group,
• to a (meth)acryloyl group of a compound having at least two (meth)acryloyl groups and a hydroxyl group, and
• subsequent esterification of the hydroxyl group of the resulting addition product with a polybasic acid anhydride,
• wherein the compound having a β-diketone moiety is represented by general formula (I):
• R1 represents an alkyl group having 1 to 20 carbon atoms;
• R2 represents R11, OR11, COR11, SR11, CONR12R13, or CN;
• R11, R12, and R13 each independently represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 30 carbon atoms, an arylalkyl group having 7 to 30 carbon atoms, or a heterocyclic group having 2 to 20 carbon atoms, in which said alkyl group, aryl group, arylalkyl group, and heterocyclic group may have a hydrogen atom substituted with OR21, COR21, SR21, NR22R23, CONR22R23, —NR22—OR23, —NCOR22—OCOR23, —C(═N—OR21)—R22, —C(═N—OCOR21)—R22, CN, a halogen atom, —CR21═CR22R23, —CO—CR21═CR22R23, a carboxyl group, or an epoxy group;
• R21, R22, and R23 each independently represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 30 carbon atoms, an arylalkyl group having 7 to 30 carbon atoms, or a heterocyclic group having 2 to 20 carbon atoms;
• methylene units of an alkylene moiety of the substituents represented by R11, R12, R13, R21, R22, and R23 may be interrupted by an unsaturated linkage, an ether linkage, a thioether linkage, an ester linkage, a thioester linkage, an amido linkage, or a urethane linkage at 1 to 5 sites thereof;
• an alkyl moiety of the substituents represented by R11, R12, R13, R21, R22, and R23 may be branched or cyclic;
• an alkyl terminal of the substituents represented by R11, R12, R13, R21, R22, and R23 may have an unsaturated bond;
• R12 and R13, and R22 and R23 may be connected to each other to form a ring;
• R2 may be taken together with a neighboring benzene ring to form a ring;
• R3 and R4 each independently represent R11, OR11, SR11, COR11, CONR12R13, NR12COR11, OCOR11, COOR11, SCOR11, OCSR11, COSR11, CSOR11, CN, a halogen atom, a nitro group, or a hydroxyl group;
• a represents an integer of 0 to 3;
• b represents an integer of 0 to 4;
• when a or b is 2 or greater, then R3s or R4s may be the same or different;
• and
• the β-diketone moiety may have either a keto-form or an enol-form.