Ink coatings for security documents to prevent forgery by means of heat sensitive erasable ink
AssigneeSicpa Holding SA
InventorsChristophe Dumusois, Cécile Leprince, Dagmar Lukas
Life of this patent
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Abstract
Disclosed is a solvent-borne or UV-curable fugitive ink composition for application to a substrate that is to be provided with indicia. The ink composition comprises at least one halochromic compound and at least one filler compound and is capable of preventing indicia formed with a heat sensitive erasable ink on an area of the substrate carrying the fugitive ink composition and thereafter subjected to a thermal treatment from becoming invisible to an unaided eye.
Claims20
A security document comprising:
- a substrate including thereon an area for receiving indicia comprising at least one of value, date and signature;
- the area of the substrate including a printed background comprising a solvent-borne or UV-curable fugitive ink composition including a halochromic compound and a filler;
- and
- the fugitive ink composition being capable of preventing indicia formed from a heat sensitive erasable ink from becoming invisible to an unaided eye when the indicia is applied to the area and thereafter subjected to thermal treatment.
The security document according to 1, wherein the halochromic compound changes its color from a colourless or pale coloured state at a lower pH to a (more) colored state at a higher pH.
A method of protecting a security document from forgery, comprising providing on an area of the security document a printed background comprising a solvent-borne or UV-curable fugitive ink composition including at a halochromic compound and a filler, the area being an area for receiving indicia comprising at least one of value, date and signature;
- and
- the fugitive ink composition is capable of preventing indicia formed from a heat sensitive erasable ink from becoming invisible to an unaided eye when the indicia is applied to the area and thereafter subjected to thermal treatment.
Dependencies are inferred from the claim text.