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Heat sensitive tamper indicating markings

An indicator marker, variable technology, applied in thermal excitation analysis, material analysis by observing the effect on chemical indicators, printing process, etc., can solve problems affecting tax collection, impossible to track and trace, no tax stamps, etc.

Inactive Publication Date: 2016-02-10
SICPA HLDG SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, counterfeiting can also have an impact on government revenues as it affects the collection of taxes (for example on cigarettes and liquor) due to the existence of a black market where it is impossible to track and trace counterfeit revenue stamps without valid revenue stamps (smuggled, misappropriated, etc.) product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0063] The invention will be described in more detail based on the following non-limiting examples.

[0064] Table 1: Solvent-based optically variable inks for screen printing

[0065]

[0066] Table 2: Water-based optically variable inks for screen printing

[0067]

[0068]

[0069] The weight % is based on the total weight of the optically variable ink.

[0070] 100 g each of the optically variable inks of Tables 1 and 2 were prepared by mixing the ingredients described in Tables 1 and 2 except for the thermally expandable spheres and optional optically variable pigment particles. Mixing at room temperature was performed using a dispersing paddle (stainless steel, 5 cm in diameter) at a speed of about 1500 rpm over about 10 minutes. The optically variable pigment particles and thermally expandable spheres are then added to the mixture thus obtained and mixed at a speed of 1500 rpm for about 10 minutes.

[0071] Each of the optically variable inks of Tables 1 and...

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Abstract

The present invention relates to the field of heat sensitive optically variable inks and tamper indicating markings obtained thereof. The present invention relates to the field of irreversible changes in color and / or changes in structure upon a tampering attempt against articles or items comprising said tamper indicating markings through the use of temperature variation. In particular, the present invention provides optically variable ink compositions comprising a plurality of optically variable pigment particles and a plurality of thermally expandable spheres; tamper indicating marking comprising the optically variable ink compositions described herein; their uses as a proof of an illegal action as well as methods for detecting a tampering activity of a marking including the optically variable ink composition described herein.

Description

technical field [0001] The present invention relates to the field of thermally sensitive optically variable inks and tamper indicating marks obtained therefrom. In particular, the invention relates to the field of irreversible changes in color and / or changes in structure that occur when tampering with an article or article comprising said tamper-indicating marks is attempted by using temperature changes. Background technique [0002] With the ever-increasing quality of color copying and printing and attempts to protect high-value documents and high-value products (such as bank notes, identity documents and high-value commodities), various security elements are added to or placed in these documents or products. These have become common practice on documents or artifacts. Typical examples of security elements include security threads or strips, windows, fibers, planchettes, foils, decals, holograms, watermarks, security inks or compositions comprising optically variable pigme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/50C09D11/03C09D11/38B41M3/00
CPCB42D2033/26B41M3/14B42D25/378C09D11/037C09D11/50Y10T428/24901B41M3/142G01N21/71G01N21/78
Inventor T·L·加扎维T·克拉西克J·韦林H·利厄
Owner SICPA HLDG SA
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