HIGH-EFFICIENCY AND ENVIRONMENTAL FRIENDLY ALKALINE COPPER CHLORIDE ETCHANT FOR PRINTED CIRCUIT BOARD
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United States of America Patent
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Issued Date -
Oct 28, 2021
app pub date -
Aug 4, 2017
filing date -
Aug 9, 2016
priority date (Note) -
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Abstract
A high-efficiency and environmental-friendly alkaline cupric chloride etchant for a printed circuit board, comprising copper chloride and a sub-etchant. The sub-etchant comprises the following in percentage by weight: 10 to 30 percent of ammonium chloride, 0.0002 to 25 percent of carboxylic acid and/or ammonium carboxylate, 0.01 to 45 percent of ammonium carbonate and/or ammonium bicarbonate, 0.0001 to 20 percent of one or more selected from hydroxylamine hydrochloride, hydroxylamine sulphate and hydrazine hydrate, the balance being water. The initial feed amount B of copper chloride is calculated according to the following formula: B=(134.5/63.5)×the set value of the copper ion concentration A; the control parameter of the production process of the resulting etchant is set to be: the copper ion concentration of 30-170 g/L.
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