Water soluble formulation for masking and the like, and method utilizing the same
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United States of America Patent
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Jul 6, 1993
Grant Date -
N/A
app pub date -
Sep 19, 1991
filing date -
Sep 19, 1991
priority date (Note) -
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Abstract
A water-soluble coating or other deposit is produced from a formulation that is comprised of a curable liquid substance and a dispersed particulate effervescing agent. The formulation is particularly useful as a solder resist in the manufacture of PCBs, and the preferred composition contains n-vinyl-2-pyrrolidone, N,N-dimethylacrylamide, and polyvinylpyrrolidone.
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