IMPROVEMENTS IN PRINTING INKS AND IMPROVEMENTS CONCERNING PRINTING INKS Russian patent published in 2006 - IPC C09B47/04 C07D487/22 C09D11/02 G03G9/09 

FIELD: printing inks.

SUBSTANCE: invention relates to materials generating charge, in particular to printing inks and toners for protective marking and applying protective markers in order to reveal falsifications and counterfeits. Use of counterfeit protection technology is described involving printing ink composition containing charge-generation substance and a medium, wherein charge-generation substance has maximum absorption in near IR region within a range of 700-1500 nm and in visible region within a range of 400-700 nm, this substance being compound selected from a type of polymorphous modification of X form of metal-free phthalocyanine, type of polymorphous modification of Y form and phase I and II forms of titanyloxyphthalocyanine, polymorphous modification of phase II form of vanadyloxyphthalocyanine, and polymorphous modification of phase V form of hydroxygalliumphthalocyanine and methoxygalliumphthalocyanine. Printing ink composition is applied onto an article or substrate using known printing procedure. Methods of establishing authenticity of an article or substrate are also described, which consist in determining characteristic absorption of marker in near IR region.

EFFECT: enabled effective protection of articles or substrates when using printing inks containing, for example, blue or green dyes, whose absorption bands can be shifted to infrared region and partially mask absorption properties of marker.

20 cl, 4 tbl, 6 ex