| abstract |
[Problem] To provide a novel electroless plating undercoat agent that is environmentally friendly, can be easily treated in a small number of steps, can easily form fine wiring of several micrometers in width by printing or photolithography, and is used in a pre-treatment step for electroless plating. [Solution] A photosensitive undercoat agent that is an undercoat agent for forming a metal plating film upon a base material by using electroless plating and includes: (a) a hyperbranched polymer having an ammonium group at the molecular terminals thereof and having a weight-average molecular weight of 1,000–5,000,000; (b) metal microparticles, (c) a polymerizable compound having at least one (meth) acryloyl group per molecule; (d) a photopolymerization initiator; and (e) a surfactant. |