PVOH-based coating solutions
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United States of America Patent
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Sep 3, 2002
Grant Date -
N/A
app pub date -
Mar 6, 1995
filing date -
Mar 6, 1995
priority date (Note) -
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Abstract
An improved PVOH-based coating solution for application to a polymeric substrate. The coating solution includes poly(vinyl alcohol), a formaldehyde-containing crosslinking agent and a crosslinking-promoting acid catalyst which lowers the pH of the solution to about 3.5 or less and, preferably, to about 3 or less. The coating solution exhibits improved viscosity stability, particularly with the addition of a second acid catalyst. The coating solution also provides improved crosslinking and oxygen barrier characteristics upon drying.
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