Abstract: A process for preparing a printed circuit board. The process involves successive steps of coating a photosensitive electrodeposition coating composition onto a printed-circuit copper-clad, laminated base plate to form a photosensitive resist film, applying a pattern mask onto the photosensitive resist film, exposing to an active light, developing and etching. Also the printed-circuit copper-clad, laminated base plate is subjected to a corrosion preventing treatment after cladding or laminating and prior to the step of coating the electrodeposition coating composition thereonto with a nitrogen-containing heterocyclic compound as a corrosion inhibitor.

Abstract: Disclosed is an improved process for preparing a printed-circuit board, which comprises successive steps of electrodeposition coating of a photosensitive resin on a printed-circuit base plate to form a photosensitive resist film, exposure to light through a pattern mask, development and etching, the improvement further comprising a step of dipping the photosensitive resist film formed by electrodeposition coating into an aqueous solution comprising water as a major component and applying a voltage to carry out electroendosmosis, whereby the tendency of the photosensitive resist film to stick to the pattern mask is reduced.

Abstract: Disclosed is an improved process for preparing the printed circuit board, which comprises coating a photo-curable electrodeposition coating composition on the surface of the copper foil of a copper-clad, laminated plate to form a photo-sensitive resist film thereon, lapping a photographic negative or positive film onto the photo-sensitive resist film, and exposing to an active light, followed by development, the improvement comprising incorporating a colorless or substantially colorless reduction-type leico pigment into the electrodeposition coating composition to form a photo-sensitive resist film containing the leico pigment, and to develop a color in an exposed area of the photo-sensitive resist film by exposing to the active light.