Alkaline cupric chloride etchant for printed circuit board

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United States of America

PATENT NO 11225722
APP PUB NO 20210332484A1
SERIAL NO

16322459

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Importance

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Abstract

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An 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)x 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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Patent Owner(s)

Patent OwnerAddress
YE TAOROOM 1808 ZHONGXIN BUILDING 268 BAOGANG AVENUE HAIZHU DISTRICT GUANGZHOU GUANGDONG 510230 GUANGZHOU CITY GUANGDONG PROVINCE 510230

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ye, Tao Guangdong, CN 90 559

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