| abstract |
(57) Abstract: A cured product obtained by selectively exposing to ultraviolet light through a film on which a pattern is formed and developing an unexposed portion to form a solder resist pattern that can be developed. Is the development of resin compositions with good heat resistance and excellent plating solution resistance. A carboxyl group in a polymer (a) having at least one carboxyl group has the following formula (1): (Wherein, R1 is a hydrogen atom or a methyl group, and R2 is Alkylene, cyclohexane-1,4-dimethylene, which is an integer having 2 to 4 carbon atoms, or the following formula (2): (Where R3 is a hydrogen atom, a methyl group or an ethyl group, and n is a number of 1 to 5). A resin composition comprising a compound (A) to which a compound (b) represented by the following formula (1) is added and a diluent (B). |