US 11,891,527 B2
Machine readable security features
Marlyse Demartin Maeder, La Sarraz (CH); and Claude-Alain Despland, Prilly (CH)
Assigned to SICPA HOLDING SA, Prilly (CH)
Appl. No. 17/055,851
Filed by SICPA HOLDING SA, Prilly (CH)
PCT Filed Feb. 19, 2019, PCT No. PCT/EP2019/054055
§ 371(c)(1), (2) Date Nov. 16, 2020,
PCT Pub. No. WO2019/219250, PCT Pub. Date Nov. 21, 2019.
Claims priority of application No. 18172309 (EP), filed on May 15, 2018.
Prior Publication US 2021/0138823 A1, May 13, 2021
Int. Cl. C09D 11/10 (2014.01); C09D 11/101 (2014.01); B41M 3/14 (2006.01); C09D 11/033 (2014.01); C09D 11/037 (2014.01); C09D 11/322 (2014.01)
CPC C09D 11/101 (2013.01) [B41M 3/14 (2013.01); B41M 3/144 (2013.01); C09D 11/033 (2013.01); C09D 11/037 (2013.01); C09D 11/322 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A security ink for printing a machine readable security feature, said security ink comprising one or more IR absorbing materials selected from the group consisting of
a crystal water-free iron(II) metal orthophosphate of the general formula KFePO4,
crystal water-free iron(II) metal phosphonates,
crystal water-free iron(II) metal pyrophosphates,
crystal water-free iron(II) metal metaphosphates of the general formula FeaMetb(POc)d, where a is a number from 1 to 5, b is a number from >0 to 5, c is a number from 2.5 to 5, d is a number from 0.5 to 3 and Met represents one or more metals selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Sr, Ba, Sc, Y, La, Ti, Zr, Hf, Nb, Ta, Cr, Mo, W, Mn, Cu, Zn, Co, Ni, Ag, Au, B, Al, Ga, In, Si, Sn, Sb, Bi and the lanthanoids, and
mixtures thereof,
wherein said security ink is
an oxidative drying security ink comprising from about 0.01 wt-% to about 10 wt-% of one or more driers, the weight percents being based on a total weight of the oxidative drying security ink, or
a UV-Vis curable security ink comprising from about 0.1 wt-% to about 20 wt-% of one or more photoinitiators, the weight percents being based on a total weight of the UV-Vis curable security ink, or
a thermal drying security ink comprising from about 10 wt-% to about 90 wt-% of one or more solvents selected from the group consisting of organic solvents, water and mixtures thereof, the weight percents being based on a total weight of the thermal drying security ink, or
a combination thereof.