| 摘要 |
The present invention relates to printing inks for the intaglio printing process, also referred to as engraved steel die printing process. An intaglio printing ink composition comprising at least as a principal component an oxidatively curable material, selected from group consisting of the alkyd resins and the modified alkyd resins of synthetic or natural origin, in an amount between 20 and 50 wt-% of the total printing ink, at least one UV-curable acrylate in an amount between 2 and 15 wt-% of the total printing ink, at least one fusible wax with the melting point or melting range between 50 to 120°C, in an amount up to 10 wt.-%, of the total printing ink, at least one oxypolymerization siccative, at least one photoinitiator, and optionally pigments, fillers, additives and solvents. To obtain the printing ink a process for producing an intaglio printing ink composition comprising the steps of a) grinding together, at least one oxypolymerization-curable material selected from group consisting of the alkyd resins and the modified alkyd resins of synthetic or natural origin, at least one UV-curable acrylate, at least one fusible wax with the melting point or melting range between 50 to 120°C, and optional fillers and solvents, to obtain a homogeneous dispersion; b) grinding together, at least one oxypolymerization-curable material, selected from group consisting of the alkyd resins and the modified alkyd resins of synthetic or natural origin, at least one pigment, and optional fillers and solvents to obtain a homogeneous dispersion; c) mixing and grinding together the dispersion of step a), the dispersion of step b) , an oxidative siccative, a photoinitiator and an optional photoinitiator stabilizer, to obtain the printing ink of the invention. These inks can be printed on a standard printing press and allow to significantly reduce or eliminate the undesired set-off which can occur after printing and stacking the printed sheets. The ink can be used for printing security documents or document of value. |
