PHOTOSENSITIVE RESIN COMPOSITION, PHOTOSENSITIVE LAMINATE, FLEXIBLE CIRCUIT BOARD AND METHOD FOR FORMING PERMANENT PATTERN

摘要

PROBLEM TO BE SOLVED: To provide a photosensitive resin composition having excellent storage stability and good exposure sensitivity and suitable for forming a solder resist showing a higher reflectance.SOLUTION: The photosensitive resin composition comprises (A) an acid modified ethylenically unsaturated group-containing polyurethane resin, (B) a radical polymerizable compound, (C) a photopolymerization initiator, and (D) a hindered amine-based polymerization inhibitor. The (A) polyurethane resin includes a partial structure expressed by general formula (UE1). In the formula, Lrepresents a divalent linking group having neither -NHC(=O)O- nor -OC(=O)NH- in a bond of the main chain and having one ethylenically unsaturated group in a side chain.