| http://www.w3.org/ns/prov#value | - A photopolymerizable composition useful as a solder mask comprising:(a) a copolymer possessing carboxyl groups, and which is a reaction product consisting of at least one compound having the formula (1): ##STR16## wherein R1 is a hydrogen atom or methyl group and R2 is a C1 to C6 aliphatic hydrocarbon group, and at least one compound having the general formula (2): ##STR17## wherein R1 has the sam
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