Ink composition for marking and authenticating objects

Details Ink composition for marking and authenticating objects Ink composition for marking and authenticating objects

1996-01-25

1997-12-30

Klemanski, Helene

Compositions: coating or plastic

Coating or plastic compositions

Marking

106 3115, 106 3158, 106 3137, C09D 1100

Patent

active

057025118

ABSTRACT:
This aim of the invention is to develop an ink composition comprising at least one non-photochromic pigment or dye, a photochromic pigment or dye and a solvent, the photochromic pigment or dye changing absorption spectrum under the effect of a first light emitting in a wavelength belonging to the ultra-violet range, so that when it is subsequently illuminated by a second light only emitting in a wavelength belonging to the visible range, it has a color different from that which it had, under the illumination of said second light, prior to illumination by said first light, said color also differing from that of the non-photochromic pigment or dye when the latter is illuminated by said second light.

REFERENCES:
patent: 3866083 (1975-02-01), Laxer
patent: 3928226 (1975-12-01), McDonough et al.
patent: 4015131 (1977-03-01), McDonough et al.
patent: 5084204 (1992-01-01), Auslander
patent: 5135569 (1992-08-01), Mathias
patent: 5256192 (1993-10-01), Liu et al.
patent: 5551973 (1996-09-01), Oliver et al.
patent: 5569317 (1996-10-01), Sarada et al.

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