Patent ID: 7794578
Filing Date: 2010-09-14
Classification: C25D,H05K,Y10T

Abstract:
1. A method for preparing a circuit board material, comprising: providing a plating bath comprising: nickel sulfamate at a concentration of 300 to 600 g/l; and at least one of phosphoric acid, phosphorous acid, hypophosphorous acid, and salts thereof at a concentration of phosphorus of 20 to 150 g/l; providing an electrode inside the plating bath; providing a conductive metal foil inside the plating bath to face the electrode, the conductive metal foil having a first surface and a second surface, the second surface being masked, wherein the conductive metal foil is selected from the group consisting of copper foil, aluminium foil, aluminium alloy foil, and iron alloy foil, wherein the conductive metal foil has a surface roughness Rz of not more than 2.5 μm; applying current between the electrode and the conductive metal foil to form a thin resistance layer plated on the first surface of the conductive metal foil to prepare a circuit board material, wherein the thin resistance layer has an average electrodeposition amount of nickel of 2.3 to 18.0 mg/dm adhering an insulating material to the thin resistance layer formed on the first surface, and etching the conductive metal foil to make a circuit pattern.