Shellac dispersions and coatings, and method of forming aqueous-based shellac dispersions and coatings
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United States of America Patent
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Oct 22, 1996
Issued Date -
N/A
app pub date -
Oct 12, 1995
filing date -
Jul 14, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of forming the aqueous-based shellac dispersion includes dissolving a shellac solution in a basic aqueous solvent to form a shellac solution and subsequently combining the shellac solution with an acidic aqueous solution, whereby the shellac precipitates to form the aqueous-based shellac dispersion. A film can be formed by applying the shellac dispersion to a suitable surface and exposing the dispersion to conditions which cause a substantial portion of the shellac particles in the dispersion to fuse, thereby forming a shellac film on the surface. The shellac film does not include any organic solvent for the shellac or any amine-containing shellac salt. A plasticizer can be employed to form a continuous shellac coating on a substrate at significantly reduced temperatures.
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