EP0432093A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Highly reactive printing inks
Assignee: SICPA Holding SA
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Filing: 1990-11-19
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Granted: —
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Expires: 2010-11-19
Abstract
Abstract A printing ink for the printing of security documents by the method of engraved steel die printing, having a viscosity of at least 1 Pa· s 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.
Inventors
- 👤 Philippe Amon
- 👤 Haim Bretler
- 👤 Anton Bleikolm
- 👤 Olivier Rozumek
- 👤 Pierre Degott
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 18:19
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/02; C09D11/10; C09D11/101; B; B41; B41M; B41M3/00; B41M3/14
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
81 words
- An engraved steel die printing ink, containing at least one organic polymerizable binder material and at least one colour pigment and having a viscosity of at least 1 pa·s at 40°C at a shear rate of about 1000 sec⁻¹, wherein said binder material contains at least one compound capable of being polymerized according to a cationic reaction mechanism, said ink further containing an energy sensitive polymerization inititator capable of liberating a cationic starting compound under the influence of applied energy.
Claim 2
Dependent Claim
15 words
- The ink of claim 1, wherein said polymerization initiator is a radiation sensitive compound.
Claim 3
Dependent Claim
16 words
- The ink of claim 2, wherein said radiation sensitive compound is an aromatic onium salt.
Claim 4
Dependent Claim
30 words
The ink of claim 3, wherein said radiation sensitive compound has the formula Ar₃ S⁺ [MF₆]⁻ wherein Ar is a monovalent aromatic radical and M is P, As or Sb.
Claim 5
Dependent Claim
68 words
- The ink of claim 3, wherein said radiation sensitive compound has the formula (Ar′)₂ I⁺ [MF₆]⁻ or (Ar′)₃ S⁺ [MF₆]⁻ wherein the Ar′ are monovalent aromatic radicals, at least one of them being substituted with a nuclear bound OR group attached to the aryl nucleus via its oxygen atom, R being an alkyl radical having at least 8 carbon atoms, and M is arsenium, bismuth or phosphorus.
Claim 6
Dependent Claim
15 words
- The ink of claim 1, wherein said polymerization initiator is sensitive to UV radiation.
Claim 7
Dependent Claim
23 words
- The ink of claim 1, wherein said polymerization initiator is sensitive to hot fluids having a temperature of from 120° to 250°C.
Claim 8
Dependent Claim
18 words
- The ink of claim 1, wherein said liberated cationic starting compound is a Lewis or Bronsted acid.
Claim 9
Dependent Claim
49 words
- The ink of claim 1, wherein said polymerizable binder material is selected from cationically polymerizable monomeric, oligomeric and polymeric insaturated organic compounds, and heterocyclic compounds capable of undergoing a ring-opening reaction and their mixtures, said compounds having been chain extended in order to raise molecular weight and viscosity.
Claim 10
Dependent Claim
16 words
- The ink of claim 1, wherein said binder matrix further contains a thermoplastic polymeric material.
Claim 11
Dependent Claim
70 words
- An engraved steel die printing ink, comprising in admixture: (A) An organic binder matrix containing at least one organic compound capable of being polymerized by a cationic reaction mechanism, (B) at least one energy sensitive cationic polymerization initiator, (C) at least one anorganic or organic colour pigment and at least one extender, and (D) ink conditioning additives, the ink having a viscosity of at least 1 Pa·s at 40°C.
Claim 12
Dependent Claim
57 words
- The ink of claim 11, comprising in admixture and by weight: - about 20 to about 60% of the organic binder matrix (A), - about 1 to about 15% of the onium salt based curing initiator (B), - up to about 60% of group (C) materials, and - 0 to about 20% of group (D) additives.
Claim 13
Dependent Claim
124 words
- A method for the printing of security documents by the engraved steel die printing process, comprising the use of a printing ink having a viscosity of at least 1 Pa· s at 40°C under a shear rate of about 1000 sec⁻¹, and containing at least one organic polymerizable binder material selected from compounds capable of being polymerized according to a cationic reaction mechanism, at least one energy sensitive polymerization initiator capable of liberating a cationic starting compound under the influence of applied energy, and at least one colour pigment together with optional extenders and ink conditioning additives, and wherein the printings which are produced in the method are polymerization cured by the application of at least one means selected from radiation and heat.
Claim 14
Dependent Claim
15 words
- The method of claim 13 wherein said polymerization curing is effected by UV radiation.
Claim 15
Dependent Claim
23 words
- The method of claim 13 wherein said polymerization curing is effected by hot air having a temperature of from 120° to 250°C.
Claim 16
Dependent Claim
16 words
- The method of claim 13 wherein said polymerization curing is effected by electron beam curing.
Claim 17
Dependent Claim
15 words
- The method of claim 13 wherein said polymerization curing is effected by infrared radiation.
Claim 18
Dependent Claim
17 words
- A security document printed by the printing method of any one of claims 13 to 17.
References Cited (Backward Citations)
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