A resin composition for an organic insulating layer produced by polymerizing about 5 to about 35 wt % of an unsaturated carboxylic acid, an unsaturated carboxylic acid anhydride, or a mixture thereof, about 5 to about 40 wt % of a styrene compound, about 5 to about 40 wt % of an epoxy compound, about 0.1 to about 10 wt % of an isobornyl compound, and about 20 to about 40 wt % of a dicyclopentadiene compound based on the total weight of unsaturated carboxylic acid, unsaturated carboxylic acid anhydride, styrene compound, epoxy compound, isobornyl compound, and dicyclopentadiene compound.