Sumitomo Electric Industries, Limited

Sumitomo Electric Printed Circuits, Inc.

Mec Company Ltd.

Masaharu Yasuda

Koji Nitta

Shoichiro Sakai

Akira Tsuchiko

Yu Fukui

Kenji Nishie

Ryuta Ohsuka

Koji Kasuya

Yoshihito Yamaguchi

A regenerating method of a removal liquid including: removing a nickel-chromium-containing layer from a substrate using the removal liquid at a time of manufacturing a printed circuit board by a semi-additive method, the substrate including the nickel-chromium-containing layer and a copper-containing layer; collecting the removal liquid that has been used; and contacting the collected removal liquid in collecting the removal liquid with a chelate resin, wherein the chelate resin includes a functional group represented by a following formula (1): where a plurality of Rs are identical divalent hydrocarbon groups having 1 to 5 carbons, and a portion of hydrogen atoms in the hydrocarbon groups are substituted with halogen atoms or not substituted with a halogen atom.

Regenerating method of removal liquid and regenerated removal liquid preliminary

In manufacturing a printed circuit board using a semi-additive method, a removal liquid that has been used in removing a nickel-chromium-containing layer () is regenerated by contacting the removal liquid with a chelate resin having a functional group represented by a following formula (1): where a plurality of Rs are identical divalent hydrocarbon groups having 1 to 5 carbons, and a portion of hydrogen atoms may be substituted with halogen atoms.

Method of manufacturing printed circuit board

Growing community of inventors

Osaka, Japan

Masaharu Yasuda