FIELD: chemistry.
SUBSTANCE: invention relates to a fluorescent compound of formula
in which R1 and R1′ independently are hydrogen or C1-C8alkoxy, R2 and R2′ independently of one another are hydrogen or C1-C8alkyl, R3 and R3′ independently of one another are hydrogen or C1-C8alkyl, R4 and R4′ independently are hydrogen or C1-C8alkoxy, or two R1 and R2, R1′ and R2′, R3 and R4 and/or R3′ and R4′ together form a group of
. Invention also relates to use of compounds for printing with counterfeit protection, to use in printing ink composition, to a composition of printing ink, to A protected document and a method of producing said compound.
EFFECT: technical result is obtaining a novel fluorescent compound possessing high resistance to chemicals and solvents, which can be used as fluorescent pigments in process of printing with counterfeit protection.
12 cl, 2 tbl, 4 ex
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Authors
Dates
2016-06-10—Published
2012-01-11—Filed