FIELD: chemistry.
SUBSTANCE: invention relates to quaterrylene and/or terrylene dyes covalently bonded with a polymer, intended for use in printing ink. Described is a method of increasing solubility and/or dispersibility quaterrylene and/or terrylene dye in liquid medium. Method involves covalent bonding of said dye and polymer, soluble in said liquid medium. Said polymer contains phenol resin, in which phenol fragments are substituted with C1-C10-alkyl. Invention also describes printing ink composition containing polar liquid medium, in which is dissolved or dispersed at least one said polymer-covalently bonded quaterrylene and/or terrylene dye, and obtained using composition marking or protective element.
EFFECT: invention provides higher solubility and/or dispersibility of quaterrylene and/or terrylene dyes in printing ink liquid medium and possibility of using said dyes for authenticating articles.
18 cl, 6 tbl, 2 ex
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