| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a nickel etchant which can suppress the corrosion of metal other than nickel, particularly that of copper. <P>SOLUTION: The etchant contains: nitric acid or sulfuric acid; hydrogen peroxide; and water, wherein the etchant has a composition containing a polymer having a repeated unit selected from formula (I) and formula (III). <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
