Process for preparing nonconductive substrates
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United States of America Patent
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Sep 1, 1992
Grant Date -
N/A
app pub date -
Jun 1, 1990
filing date -
Jun 1, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Described herein is a process for desmearing and etching back the surface of a nonconductive substrate which comprises (a) contacting the substrate with a strong acid; (b) then contacting the substrate with an aqueous basic solution; and (c) contacting the substrate with a reducing agent dissolved in a strong acid.
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