Invisible ink jet inks

Details Invisible ink jet inks Invisible ink jet inks

Category

C - Chemistry, Metallurgy

Subcategory

09

Subsubcategory

D

IPC codes

C09D 11/00 (2006.01) B41J 2/01 (2006.01) C09D 11/02 (2006.01)

Type

Patent

Patent number

CA 2454429

Description

Water-based invisible red fluorescent inks provide machine-readable, inverse- contrast invisible images and can be printed using conventional ink jet printers. The inks employ rare earth complexed ligand fluorophores having narrow excitation and emission spectra. In one embodiment the images are printed with an ink comprising water and a water-soluble organic fluorescent fluorophore, which when printed and dried on paper is invisible to the eye and fluoresces in the green to infrared range, e.g., from about 550 to 1200 nm, when irradiated with short wave length UV radiation, e.g., from 230nm to 280nm. The highly specific excitation and emission rates, coupled with a high inverse contrast on papers of all colors, makes them particularly useful as ink jet inks for postal and other purposes.

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