COMPOSITION FOR PRINTING TACTILE FEATURES ON A SECURITY DOCUMENT
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United States of America Patent
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app pub date -
May 30, 2013
filing date -
Dec 22, 2008
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Abandoned
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Abstract
Improved ultraviolet light-curable compositions are provided for printing onto a security document substrate in a predetermined pattern to make tactile features for use by people with impaired vision to, for example, recognize the denominations of banknotes. The improved compositions substantially comprise an acidic trifunctional acrylate ester, preferably in an amount of 60-80 wt %, and include urethane acrylate and effective amounts of flexibilizer (e.g. low viscosity aromatic monoacrylate having an elongation parameter of about 200), photoinitiator and a rheological additive (e.g. silica). The composition unexpectedly provides flexibility and is particular useful for printing tactile features in the form of relatively large continuous graphical patterns.
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