UV Cure Cationic Epoxy Technology

UV cure cationic epoxy adhesives are composed of epoxy resins and cationic photoinitiators with additives and modifiers. Cycloaliphatic epoxy resins are the main epoxy resins used for cationic epoxy formulations. Oxetanes are often combined with epoxy resins to improve curability and adjust viscosity. Cationic photoinitiators are all onium salts, composed of an organic cation with an inorganic anion. UV cure cationic epoxy adhesives can be cured quickly via UV light radiation and have been very successful in electronics assembly and general bonding applications. UV cure equipment, formulating, testing, and evaluation of UV cure cationic epoxy adhesives are described.