Treating laminates with a wetting/reducing solution after desmearing with permanganate
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United States of America Patent
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Oct 10, 1989
Grant Date -
N/A
app pub date -
May 27, 1987
filing date -
Jun 9, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An aqueous composition is provided for treating a laminate in the manufacture of a printed circuit board, the composition comprising a wetting agent, which has a positively charged quaternary nitrogen atom, and a reducing agent which is compatible with the wetting agent. Preferably the reducing agent is hydroxylamine or one or more of its salts, but oxalic acid or one or more oxalates may, alternatively or as well, be used. The compatibility of the wetting and reducing agents enables the number of process steps to be reduced.
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