| abstract |
(57) Abstract: Provided is an ultraviolet-curable photo solder resist ink which forms a permanent protective film having a small halogen content. The object of the present invention is to provide (A) an ultraviolet curable resin having an unsaturated ethylene and a carboxyl group in a side chain, In a photo solder resist ink containing (B) a polyfunctional epoxy compound, (C) an organic coloring pigment, (D) a photopolymerization initiator, and (E) an organic solvent, the organic coloring pigment does not contain a halogen in a chemical structural formula. The problem is solved by a photo solder resist ink selected from the group consisting of organic color pigments, wherein the halogen content in the cured product of the photo solder resist ink is 500 ppm or less. |