Use of a liquid containing IR dyes as printing ink
First Claim
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1. A method of printing a substrate, comprising printing said substrate by intaglio, letterpress or flexographic printing with a liquid printing ink comprising a solvent, binder and one or more dyes having an adsorption maximum of from 700 to 1200 nm, said dyes being:
- a. metal-free phthalocyanines,b. phthalocyanines complexed with two lithium atoms, or with magnesium, zinc, copper or nickel as central atoms,c. metal-free naphthalocyanines,d. naphthalocyanines complexed with two lithium atoms, or with magnesium, zinc, copper or nickel as central atoms,e. nickel-dithiolene complexes,f. aminimum compounds of aromatic amines, org. methine dyes, orh. azulenesquaric acid dyes.
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Abstract
A liquid useful as printing ink contains one or more dyes with their absorption maximum within the range from 700 to 1200 nm selected from the phthalocyanines, the naphthalocyanines, the nickel-dithiolene complexes, the aminium compounds of aromatic amines, the methine dyes or the azulenesquaric acid dyes, as well as solvent and binder.
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Citations
10 Claims
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1. A method of printing a substrate, comprising printing said substrate by intaglio, letterpress or flexographic printing with a liquid printing ink comprising a solvent, binder and one or more dyes having an adsorption maximum of from 700 to 1200 nm, said dyes being:
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a. metal-free phthalocyanines, b. phthalocyanines complexed with two lithium atoms, or with magnesium, zinc, copper or nickel as central atoms, c. metal-free naphthalocyanines, d. naphthalocyanines complexed with two lithium atoms, or with magnesium, zinc, copper or nickel as central atoms, e. nickel-dithiolene complexes, f. aminimum compounds of aromatic amines, or g. methine dyes, or h. azulenesquaric acid dyes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification