UV CURING OF ALKALI DEVELOPABLE SOLDER MASK

Abstract

Aqueous alkali developable UV-cure solder mask, which is an opaque liquid photo-imagable ink for printed circuit board, has been investigated in our laboratory. The fine patterns and excellent performances of the film made from photo-imagable solder mask can be obtained by optimization of concentration of developer, developing temperature and time. The proper heat postcuring makes the film highly resistent to solder heat, alkali and humidity.