Patent ID: 7156904

Claim:
An aqueous solution for forming a copper-to-resin bonding layer, comprising: (a) at least one type of acid selected from inorganic acid and organic acid; (b) tin salt or tin oxide wherein the concentration of the tin salt or tin oxide in terms of the concentration of tin is in a range of 0.1 to 5 mass %; (c) salt or oxide of at least one type of metal selected from the group consisting of: silver, zinc, aluminum, titanium, bismuth, chromium, iron, cobalt, nickel, palladium, gold, and platinum wherein the concentration of the salt or oxide of the at least one type of metal in terms of the concentration of metal is 0.5 to 10 mass %; (d) a reaction accelerator wherein the concentration of the reaction accelerator is in a range of 5 to 40 mass %, the reaction accelerator being an agent that coordinates to copper as a base material to form a chelate and facilitates forming a bonding layer for bonding resin on a copper surface; and (e) a diffusive retaining solvent wherein the concentration of the diffusive retaining solvent is in a range of 5 to 60 mass %, wherein the tin salt or tin oxide is at least one selected from the group consisting of stannous sulfate, stannic sulfate, stannous fluoroborate, stannous fluoride, stannic fluoride, stannous nitrate, stannic nitrate, stannous oxide, stannous chloride, stannic chloride, stannous formate, stannic formate, stannous acetate, and stannic acetate.