Thermochromic ink composition
OwnerRajendra Mehta, Richard L. Shields +1inventors
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.
Claims5
A security document comprising a substrate having first and second surfaces;
- said substrate having a thermochromic ink composition applied to at least a portion of said first or second surface, said thermochromic ink composition comprising a thermochromic aqueous slurry and an ink vehicle;
- wherein said thermochromic ink composition provides enhanced adhesion for toner particles printed thereon.
A method of applying a thermochromic ink composition comprising an encapsulated thermochromic pigment and an ink vehicle, said method comprising the steps of:
- a) providing a substrate having first and second surfaces,
- b) applying said thermochromic ink composition onto at least a portion of said first or second surface of said substrate;
- and
- c) printing tone over at least a portion of the area of said first or second surface containing said thermochromic ink composition.
Dependencies are inferred from the claim text.