Patent ID: 8642234

Claim:
A carboxyl group-containing photosensitive resin obtained by reacting an α,β-ethylenically unsaturated group-containing monocarboxylic acid (c) with a phenolic compound (a) containing a structure represented by the following general formula (I) and having at least two phenolic hydroxyl groups in its molecule, wherein part or the whole of the phenolic hydroxyl groups being modified into an oxyalkyl group, and further reacting a polybasic acid anhydride (d) with the resultant reaction product; wherein, R 1 represents a hydrocarbon radical of 1 to 11 carbon atoms, R 2 represents a hydrocarbon radical of 1 to 11 carbon atoms, “a” represents an integer of 0 to 3, “n” represents an integer of 1 to 2, “m” represents an integer of 1 to 10, and said phenolic compound (a) is a compound obtained by the condensation reaction of a polyhydroxymethylated bisphenol A or bisphenol F with a phenolic compound.