Security paper
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United States of America Patent
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-
Feb 9, 1999
Grant Date -
N/A
app pub date -
Sep 10, 1997
filing date -
Mar 13, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to a method for producing security paper which includes a security feature. The method comprises forming paper in a wet state, which paper incorporates on or more security features, applying to the paper a sizing agent, thereafter applying to one or both sides of the sized paper a coating comprising an unpigmented polyurethane. The unpigmented polyurethane may optionally comprise a functional additive provided that the presence of the functional additive does not increase the opacity of the paper by more than 1%. After the polyurethane has been applied the paper is dried. The coating composition provides a film, when cast on a glass surface, having a Konig hardness of from 15 to 130 seconds.
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