Anti-counterfeiting non-yellowing watermark ink
AssigneeSun Chemical Corporation
InventorsStan Newman, Paul W Hofecker
Life of this patent
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Abstract
A stable, pigmentless, simulated watermark ink is composed of a drying oil modified polyester, an aluminum alkoxide gelling agent and an ultraviolet light absorber.
Claims12
A stable, pigmentless, simulated watermark ink consisting essentially of a drying oil modified polyester resin and a gelling effective amount of an aluminum alkoxide chemical complexing agent and an ultraviolet light absorbing effective amount of an ultraviolet light absorbing agent.
A stable, pigmentless, simulated watermark ink comprising about 85 to 97 weight percent of a linseed oil modified isophthalic acid alkyd, about 1 to 5 weight percent of trioxyaluminum tri-isopropoxide and about 0.1 to 3 weight percent of a diphenylacrylate ultraviolet absorber, and having a viscosity of at least 125 poise at 25.degree. C. and a yield value of less than 25 dynes/cm.sup.2.
Dependencies are inferred from the claim text.