Patent ID: 6254758
Filing Date: 2001-07-03
Classification: C23F,H05K

Abstract:
A method of forming a conductor pattern of a wiring board, said method comprising the steps of:electrolessly forming an electroless copper plated layer on a surface of an insulating layer for forming the wiring board;forming and patterning a layer of resist on the electroless copper plated layer;electrolytically forming an electrolytic copper plated layer on the electroless copper plated layer exposed from the layer of resist;removing the layer of resist for exposing the electroless copper plated layer except for portion in which the electrolytic copper plated layer is formed;removing the exposed electroless copper plated layer by using an etching solution composed of a mixed aqueous solution containing sulfuric acid, hydrogen peroxide and Cu chelate agent; andconducting an annealing heat treatment on the electrolytic copper plated layer.