Secure core material for documents
View Patent ↗Particles conveying a code are incorporated into polymer matrix to form a core document substrate. These particles may be colored to create a distinctive look of the document that makes it unique for a particular document issuer and enables visual authentication. Addition of a covert attribute to the particle, such as a UV pigment or hidden layer of material, allows a covert, forensic characteristic and it also allows a mathematical description to be calculated describing the random distribution of a specific area on a document and then captured on it (e.g., in the bar code or magnetic stripe or digital watermark on an ID document).
1. A secure document comprising:
A synthetic core, the synthetic core comprising a polyolefin polymer and particles distributed in the polymer, the particles each comprising layers of material, the particles having at least one visible color such that the dispersed particles provide a visibly verifiable authentication attribute for the core material; the particles having a non-visible forensic material;
wherein the forensic material has a distribution within the synthetic core that is readable by scanning the secure document with an illumination source; and,
wherein a representation of the distribution is encoded in a machine readable data carrier within the secure document.
2. The core material of claim 1 wherein the layers convey a code sequence corresponding to attributes of each layer.
3. The secure document of claim 1 wherein the particles create a visible color different than a color of the core material, and the visible color comprises an out of gamut color.
4. The secure document of claim 3 wherein the particles further comprise a covert pigment that is detectable in response to illumination with a non-visible illumination source.
5. The secure document of claim 4 wherein the pigment comprises a UV pigment in a layer of the particles.
6. The secure document of claim 1 wherein the layers of material comprise a non-reactive material.
7. The secure document of claim 6 wherein the non-reactive material comprises a clay material.
8. The secure document of claim 1 wherein the machine readable data carrier is one of a bar code, magnetized strip, a digital watermark, a RF chip and optical media.