Design of epoxy resins for UV laser cure

Epoxy resins are known to be curable by UV initiated cationic living polymerization. The monochromatic UV light from scanning lasers bears some peculiarities, especially when defined structures are to be cured. Different types of UV lasers have been examined to cure resin layers of some ten micrometers thickness. Several ingredients of the resin formulations have been developed and screened for suitability in microelectronic applications similar to micro laser stereolithography. Among those were photoinitiators, sensitizers, polyols and new epoxy compounds.