IR-absorbing Intaglio ink
First Claim
Patent Images
1. Security document, wherein said security document is printed with an IR-absorbing ink, said IR-absorbing ink that is printed on the security document being an ink for an engraved steel die printing process, comprising:
- a polymeric organic binder and an IR-absorbing material,said ink having a pasty consistency with a viscosity value at 40°
C. of at least 3 Pa·
s, wherein said infrared absorbing material comprises a transition element compound, and wherein infrared absorption of the infrared absorbing material is a consequence of electronic transitions within the d-shell of transition element atoms or ions,said IR-absorbing material is present in a concentration from 10% to 50% by weight of the ink, and contains IR-absorbing transition element atoms or ions at a concentration of at least 10% by weight, and absorbs in the near infrared range (700 to 1100 nm), and has a CIE (1976) diffuse reflectance lightness (L*) value greater than 70 as measured on the neat powder, and is transparent in some range between 1100 and 2500 nm.
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Abstract
Pasty ink for the engraved steel die printing process, having a viscosity value above 3 Pa·s, preferably above 5 Pa·s at 40° C., and comprising an infrared absorbing material, wherein said infrared absorbing material is a transition element compound whose IR-absorption is a consequence of electronic transitions within the d-shell of transition element atoms or ions.
30 Citations
29 Claims
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1. Security document, wherein said security document is printed with an IR-absorbing ink, said IR-absorbing ink that is printed on the security document being an ink for an engraved steel die printing process, comprising:
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a polymeric organic binder and an IR-absorbing material, said ink having a pasty consistency with a viscosity value at 40°
C. of at least 3 Pa·
s, wherein said infrared absorbing material comprises a transition element compound, and wherein infrared absorption of the infrared absorbing material is a consequence of electronic transitions within the d-shell of transition element atoms or ions,said IR-absorbing material is present in a concentration from 10% to 50% by weight of the ink, and contains IR-absorbing transition element atoms or ions at a concentration of at least 10% by weight, and absorbs in the near infrared range (700 to 1100 nm), and has a CIE (1976) diffuse reflectance lightness (L*) value greater than 70 as measured on the neat powder, and is transparent in some range between 1100 and 2500 nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification