Security document printing ink
AssigneeSicpa Holding SA
InventorsAlbert Amon, Anton Bleikolm, Pierre Degott, Olivier Rozumek, Haim Bretler
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Abstract
A printing ink for the printing of security documents by the method of engraved steel die printing, wherein the volatile solvents comprise at most 15%, referred to the total weight of the ink, of one or more volatile organic substances, and wherein the volatile matter may further contain water. These inks reply to the new environmental requirements and have still a better wipability on the printing cylinders or plates. They allow document printing without interleaving.
Claims17
A printing ink in paste form for the printing of documents by the method of engraved steel die printing, said ink comprising print forming ink solids which contain oleoresinous components, and at least one volatile organic solvent to be evaporated during or after printing, wherein said ink solids contain a film forming macromolecular hydrophilic surface active composition having a number average molecular weight of at least 1,000 in partial replacement of said oleoresinous components, the weight ratio between said surface active composition and said oleoresinous components being in the range of (10-60):(10-80), and wherein the amount of said volatile organic solvents is less than about 15% by weight of the total weight of the printing ink, the ink containing up to about 40% by weight of water.
A printing substrate printed with an engraved steel die printing ink in paste form comprising print forming ink solids which contain oleoresinous components, and at least one volatile organic solvent to be evaporated during or after printing, wherein said ink solids contain a film forming macromolecular hydrophilic surface active composition having a number average molecular weight of at least 1,000 in partial replacement of said oleoresinous components, and the weight ratio between said surface active composition and said oleoresinous components being in the range of (10-60):(10-80).
In a paste form security printing ink for engraved steel die printing comprising an oleo-resinous compound, extender, pigment and volatile organic solvent, the improvement which comprises the amount of said volatile organic solvent being less than 15 weight % of the ink, a part of said oleoresinous compound being replaced by a film-forming macromolecular hydrophilic surfactant having a number average molecular weight of 1,000 to 150,000, said ink having a viscosity of 1 to 15 Pa.s at 40.degree. C. and a shear of 1,000 sec.sup.-1, the weight ratio between said surfactant and said oleoresinous compound being in the range of (10-60):(10-80), and the ink containing up to about 30% by weight of water.
Dependencies are inferred from the claim text.