Patent ID: 11891527
Assignee: SICPA HOLDING SA
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
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.