Thermochromic ink composition
AssigneeThe Standard Register Company
InventorsRajendra Mehta, Richard L. Shields, Aurelia Gloria W. Kalman
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Abstract
A thermochromic ink composition is provided for use on security documents such as checks which provides a reversible color change in response to heat. The ink composition includes a thermochromic aqueous slurry and an ink vehicle comprising either a phenolic modified rosin and a compatible oil, a styrene maleic anhydride resin and a glycol, or an acrylic resin varnish. The ink composition is printed on at least a portion of a substrate using letterpress printing methods and provides enhanced adhesion to toner when applied to areas of a substrate which are subsequently printed with a non-impact printing device such as a laser printer.
Claims16
A thermochromic ink composition comprising:
- a) a thermochromic aqueous slurry, and
- b) an ink vehicle selected from the group consisting of:
- 1) a phenolic modified rosin and an oil compatible with said rosin, 2) at least one styrene maleic anhydride resin and a glycol, or 3) an acrylic resin varnish in combination with a styrene maleic anhydride resin vehicle.
Dependencies are inferred from the claim text.