| 摘要 |
PROBLEM TO BE SOLVED: To provide a stable production method for an active-energy ray curing resin wherein polymerization of an unsaturated carboxylic acid such as (meth) acrylic acid, etc., is prevented, and to provide a production method for the active-energy ray curing resin excellently usable as a solder resist ink. SOLUTION: The active-energy ray curing resin is an epoxyacrylate obtained by reacting an epoxy resin and a compound having an ethylenic unsaturated double bond and a carboxyl group in a molecule such as an unsaturated carboxilic acid, etc., wherein this reaction is carried out under gas atmosphere having a specific oxygen concentration. |
