| abstract |
PROBLEM TO BE SOLVED: To be useful as an ink for producing printed wiring boards such as etching resists, plating resists, solder resists, and resists for producing nameplates, which can be made water-soluble, and which can be prepared with water or an alkaline solution. The present invention provides a photoresist ink which can be developed, has a good adhesion to a substrate, and has excellent water resistance to an etching solution, a plating solution, and the like, which can be developed and is formed by a photopolymerization reaction of the photoresist ink. SOLUTION: (A) a water-soluble photosensitive resin obtained by introducing a styrylpyridinium group or a styrylquinolinium group into a polyvinyl alcohol-based polymer, and (B) at least one photoreactive ethylene in a molecule. A compound having an unsaturated group, (C) a photopolymerization initiator, and (D) water. |