Surface treatment method of copper foil with silane coupling agent

Abstract

Disclosed is a surface treatment method for increasing adhesion of a surface of copper foil to an insulating epoxy-impregnated substrate used in printed circuit boards, which includes the steps of nodularizing a surface of an electrolytic copper foil, surface-treating the surface of the nodularized electrolytic copper foil by Zn—As alloy electrodeposition to form a Zn—As composite layer thereon and then coating the surface of the surface-treated electrolytic copper foil with a silane coupling agent mixture, whose compounding ratio of 3-aminopropyltriethoxysilane with respect to vinyltriethoxysilane is between 6:4 and 9:1. This method is very effective to prevent discoloration of copper foil caused by oxidation and the like.

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