Patent ID: 8257604

Claim:
A method for etching a resin member formed of an epoxy resin, comprising the steps of: preparing a desmear liquid including an aqueous solution obtained by imparting an alkaline property to sodium permanganate or potassium permanganate with sodium hydroxide, a temperature of the desmear liquid being in a range of 75 degrees Celsius to 85 degrees Celsius, determining that an etching rate of the desmear liquid for the rein member is below a desired range, and when the etching rate of the desmear liquid for the resin member is below the desired range, adding an accelerator composition to accelerate the etching rate, the accelerator composition being sodium carbonate (Na 2 CO 3 ) that generates carbonate ions (CO 3 2− ) when dissolved into the desmear liquid, wherein the etching rate of the desmear liquid increases as a concentration of the accelerator composition increases, determining that the etching rate of the desmear liquid for the rein member is above the desired range, and when the etching rate of the desmear liquid for the resin member is above the desired range, adding a suppressor composition to suppress the etching rate, the suppressor composition being calcium hydroxide [Ca(OH) 2 ] that generates calcium ions (Ca 2+ ) when dissolved into the desmear liquid, wherein the etching rate of the desmear liquid decreases as a concentration of the suppressor composition increases, and dipping the resin member into the desmear liquid.