Patent ID: 8124173

Claim:
A process for packaging an electronic device comprising the steps of: preparing a printed wiring board which has wiring copper layers coated with a metal layer comprising tin; coating the metal layer with an insulating protective resin layer, keeping an area for mounting an electronic device exposed; mounting the electronic device on the exposed area via an electroconductive material comprising gold; and coating the mounted electronic device and a portion of the insulating protective resin layer with an encapsulant; wherein the insulating protective resin layer is produced by employing at least one of the following resin compositions (1) to (3): (1) a resin composition comprising 100 weight parts of an organic solvent-soluble resin having a polysiloxane skeleton and a polar group, 0.5 to 30 weight parts of an epoxy compound having an epoxy equivalent of more than 800, and an organic solvent; (2) a resin composition comprising 100 weight parts of an organic solvent-soluble resin having a polysiloxane skeleton and a polar group, 0.1 to 10 weight parts of an epoxy compound having an epoxy equivalent of 100 to 800, 2 to 30 weight parts of a polyvalent isocyanate compound, and an organic solvent; and (3) a resin composition comprising 100 weight parts of an organic solvent-soluble resin having a polysiloxane skeleton and a polar group, 0.1 to 20 weight parts of an epoxy compound having an epoxy equivalent of more than 800, 2 to 30 weight parts of a polyvalent isocyanate compound, and an organic solvent.