One component photo‐curing agent for epoxy resins based on multifunctional photobase generators containing oxime–urethane groups

Abstract

In order to develop a one‐component photo‐curing system for epoxy resin, the photo‐crosslinking reactions of the diglycidyl ether of bisphenol A (DGEBA) in the presence of a multifunctional photobase generator (PBG) containing oxime–urethane groups were studied. The cross‐linking of DGEBA films and adhesion properties of DGEBA formulations containing the PBG and benzophenone increased with irradiation dose, post‐exposure baking (PEB) time, PEB temperature, and the number of oxime–urethane groups in the PBG. A synergistic effect was observed between the PBG and a base amplifier on the film cross‐linking of DGEBA. A trifunctional PBG containing oxime–urethane groups was found to be the most efficient PBG in terms of the photo‐crosslinking and adhesion properties of the DGEBA‐based formulations. Moreover, the devised formulations, including the PBG and benzophenone, were stable for at least 1 month at room temperature. The photocuring system developed in this study appears to offer a one‐pack epoxy resin curing system with practical useful properties. Copyright © 2009 John Wiley & Sons, Ltd.

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