Patent ID: 8492070

Claim:
A method of storing a photocurable and thermosetting resin composition for forming a solder resist, the method comprising the steps of: preparing a multi-part system comprising at least a first composition and a second composition, the first composition including (A) a carboxyl group-containing resin and (C) a reactive diluent, the carboxyl group-containing resin (A) having at least one carboxyl group in its molecule, and the second composition including (D) an epoxy compound having two or more epoxy groups in its molecule, and the multi-part system being prepared to further comprise (B) a photopolymerization initiator having an oxime linkage represented by the following general formula (I), said photopolymerization initiator (B) being included in a composition which is different from the first composition, and storing the first composition separately from the photopolymerization initiator (B).