초록 ▼

A printing ink for the printing of security documents by the method of engraved steel die printing, having a viscosity of at least 1 Paㆍs at 40°C. under a shear of about 1000 sec-1, containing a binder matrix, a polymerization initiator for polymerizable matrix components, fillers and pigments, and

A printing ink for the printing of security documents by the method of engraved steel die printing, having a viscosity of at least 1 Paㆍs at 40°C. under a shear of about 1000 sec-1, containing a binder matrix, a polymerization initiator for polymerizable matrix components, fillers and pigments, and the usual additives. The binder matrix contains at least one cationically polymerizable compound, modified to bring about the desired rheology of the ink, and the photoinitiator, activable by UV, heat and EB, is an onium salt capable of releasing a Lewis or Bronsted acid. This ink has best and very rapid drying characteristics.

대표청구항 ▼

A printing ink for the use in engraved steel die printing, having an engraved steel die printing ink rheology comprising a cone plate viscosity of at least 1 Paㆍs at 40°C. and at a shear rate of about 100 s-1 and being of pasty consistency, the ink containing: up to 60% by weight of the ink of at le

A printing ink for the use in engraved steel die printing, having an engraved steel die printing ink rheology comprising a cone plate viscosity of at least 1 Paㆍs at 40°C. and at a shear rate of about 100 s-1 and being of pasty consistency, the ink containing: up to 60% by weight of the ink of at least one colour pigment, an effective amount of a radiation energy sensitive cationic aromatic onium salt capable of liberating a cationic polymerization initiator under the influence of applied energy, from 20 to 60% by weight of the ink of a binder composition having a sufficiently high viscosity to ensure the required rheology of the ink, the binder composition comprising: at least one compound capable of being polymerized according to a cationic reaction mechanism, and being selected from monomeric, oligomeric and polymeric unsaturated organic compounds and heterocyclic compounds capable of undergoing a ring opening reaction, said compound being chain extended by polyesterification or polyurethanisation or both in order to raise its molecular weight and its viscosity, and a cationically non-reactive, thermoplastic polymeric material to impart the required rheology of the ink without impairing the drying capacity of the ink.