EP1723207A4 - Encres d'impression en creux presentant des proprietes rheologiques uniques - Google Patents

Encres d'impression en creux presentant des proprietes rheologiques uniques

Info

Publication number
EP1723207A4
EP1723207A4 EP05728294A EP05728294A EP1723207A4 EP 1723207 A4 EP1723207 A4 EP 1723207A4 EP 05728294 A EP05728294 A EP 05728294A EP 05728294 A EP05728294 A EP 05728294A EP 1723207 A4 EP1723207 A4 EP 1723207A4
Authority
EP
European Patent Office
Prior art keywords
viscosity
intaglio printing
temperature
ink
printing ink
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05728294A
Other languages
German (de)
English (en)
Other versions
EP1723207A1 (fr
Inventor
Solomon J Nachfolger
David Fleming
Joseph Malanga
Caspar Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sun Chemical Corp
Original Assignee
Sun Chemical Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sun Chemical Corp filed Critical Sun Chemical Corp
Publication of EP1723207A1 publication Critical patent/EP1723207A1/fr
Publication of EP1723207A4 publication Critical patent/EP1723207A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/10—Printing inks based on artificial resins
    • C09D11/102—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds
    • C09D11/104—Polyesters
    • C09D11/105—Alkyd resins

Definitions

  • the present invention relates generally to intaglio printing inks, and to intaglio printing methods.
  • intaglio printing a rotating metal printing cylinder, usually steel or copper, is engraved with a pattern or image to be printed.
  • a special ink is supplied by an inking cylinder to the printing cylinder, and the ink from the inking cylinder is transferred to the printing cylinder.
  • any excess of ink on the plain surface of the printing cylinder is wiped off by a rotating wiping cylinder.
  • the ink remaining in the engraving of the printing cylinder is then transferred under pressure onto the substrate to be printed.
  • security documents for example paper currency, postage stamps, stock certificates, bank notes and the like, requires an outstanding printing quality and particular measures to prevent counterfeiting and forgery of the printed documents.
  • Such security documents are preferably printed by the intaglio printing process.
  • Intaglio printing inks for the printing of security documents must satisfy a number of requirements, among them:
  • This object and other objects were met with the present invention, which relates in a first embodiment to an intaglio printing ink exhibiting the following rheological properties at a constant shear rate of 100/sec: a) a first viscosity at a temperature that is the same as an ambient temperature surrounding the ink prior to a point in time that the ink contacts an intaglio printing cylinder; b) a second viscosity at a temperature that is the same as an operating temperature of the intaglio printing cylinder; and c) a third viscosity at a temperature that is the same as an ambient temperature surrounding the ink after a point in time that the ink has been pressed from the intaglio printing cylinder onto the substrate; wherein the first viscosity is greater than the second viscosity by at least 45 Pas; and the third viscosity is greater than the second viscosity by at least 45 Pas.
  • the present invention relates in a second embodiment to an intaglio printing ink, the intaglio printing ink comprising: a) a pigment; b) a vehicle; and c) optionally a modifier; the intaglio printing ink having a solids content between about 92% to about 100%.
  • the present invention relates in a third embodiment to an intaglio printing method, the printing method comprising the following steps: a) supplying an intaglio printing ink according to the invention to an engraved printing cylinder; b) wiping excess intaglio printing ink from the printing cylinder; and c) transferring the printing ink from the printing cylinder onto a substrate to be printed.
  • Figure 1 is a graph depicting the results of viscosity versus time program that starts at 26°C, continues to 58°C and returns to 26°C, at a constant shear rate of 100/s, and compares the viscosity changes undergone by a Green Tyvek Ink according to the present invention compared to a known BEP Black Ink;
  • Figure 2 is another graph depicting the results of viscosity versus time program that starts at 26°C, continues to 58°C and returns to 26°C, at a constant shear rate of 100/s, and compares the viscosity changes undergone by a Green Tyvek Ink according to the present invention compared to a Black Tyvek Ink also according to the present invention;
  • Figure 3 is another graph depicting the results of viscosity versus time program that starts at 26°C, continues to 58°C and returns to 26°C, at a constant shear rate of 100/s, and shows the viscosity changes undergone by the Tyvek Ink varnish alone;
  • Figure 4 is another graph depicting the results of viscosity versus time program that starts at 26°C, continues to 58°C and returns to 26°C, at a constant shear rate of 100/s, and compares the viscosity changes undergone by a Green Tyvek Ink according to the present invention compared to a Black Tyvek Ink also according to the present invention; and
  • Figure 5 is another graph depicting the results of viscosity versus time program that starts at 26°C, continues to 58°C and returns to 26°C, at a constant shear rate of 100/s, and compares the viscosity changes undergone by a Black Tyvek Ink according to the present invention compared to a similar ink lacking carnauba wax and to a similar wax having a high melting PTFE wax instead of the carnauba wax.
  • Conventional intaglio inks usually are formulated with high amounts of solvents to keep the viscosity of the inks low when the ink is on the printing cylinder, which is customarily operated at about 80°C.
  • the amount of solvent in conventional intaglio inks can be 10% by weight or more, based on the total weight of the ink.
  • Conventional intaglio inks also contain waxes, which melt at this temperature, and help to lower the viscosity of the ink from its initial value prior to contacting the printing cylinder. However, the presence of the solvents in the inks at this initial value means that the viscosity at this initial value is still relatively low.
  • the viscosity of these conventional intaglio inks can be seen in this way to be relatively independent of temperature due to the presence of the solvent, in that there is a relatively small change in viscosity as the ink is taken from an initial value at ambient temperature before the ink contacts the printing cylinder, to a second value when the ink contacts the printing cylinder operating at about 80°C. Due to the presence of the wax, these conventional intaglio inks will regain most or all of the initial viscosity as the wax component solidifies once the ink has been transferred from the printing cylinder to the substrate, and, thus, cools to ambient temperature.
  • a plot of the viscosity of conventional intaglio inks, as a function of temperature, will normally reveal a relatively flat curve (e.g., the BEP Black ink depicted in Figure 1), as the ink is manipulated from a first viscosity at ambient temperature prior to contacting the printing cylinder, through a second viscosity at about 80°C when the ink is in contact with the printing cylinder, to a third viscosity again at, for example, ambient temperature after the ink has been pressed from the printing cylinder onto the substrate.
  • a relatively flat curve e.g., the BEP Black ink depicted in Figure 1
  • the ink is manipulated from a first viscosity at ambient temperature prior to contacting the printing cylinder, through a second viscosity at about 80°C when the ink is in contact with the printing cylinder, to a third viscosity again at, for example, ambient temperature after the ink has been pressed from the printing cylinder onto the substrate.
  • a plot of the viscosity of a member of this new class as a function of temperature at ambient temperature, then at printing cylinder temperature, then at ambient temperature again will reveal a U-shaped curve at constant shear.
  • the inventive inks will exhibit an extremely high viscosity, which will lower to an optimum viscosity for printing while the ink is in contact with the printing cylinder, and, then, the ink will quickly regain its high initial viscosity once the ink has been pressed from the printing cylinder onto the substrate, and the substrate moves away from the heated printing cylinder and the ink cools.
  • the inventive inks are ideally suited for intaglio printing, for example, security documents, such as currency, postage stamps, stock certificates, bank notes and the like, onto Tyvek and paper substrates. Because the inventive inks recover their initial high viscosity almost immediately after being pressed from the printing cylinder and the heat associated therewith, the inventive inks remain fixed in the engraving's shape and do not feather or run. This results in a final print that is much sharper than it has been possible to obtain previously.
  • the inventive inks are just as easy to wipe from the plain areas of the printing cylinder as are the conventional intaglio inks. Yet, from a practical standpoint, the combination of sharper prints and easy wiping, makes the inventive inks far superior to the conventional intaglio printing inks.
  • the present invention relates in a first embodiment to an intaglio printing ink exhibiting the following rheological properties at a constant shear rate of 100/sec: a) a first viscosity at a temperature that is the same as an ambient temperature surrounding the ink prior to a point in time that the ink contacts an intaglio printing cylinder; b) a second viscosity at a temperature that is the same as an operating temperature of the intaglio printing cylinder; and c) a third viscosity at a temperature that is the same as an ambient temperature surrounding the ink after a point in time that the ink has been pressed from the intaglio printing cylinder onto the substrate; wherein the first viscosity is greater than the second viscosity by at least 45 Pas; and the third viscosity is greater than the second viscosity by at least 45 Pas.
  • the first viscosity is greater than the second viscosity by at least 60 Pas, and/or the third viscosity is greater than the second viscosity by at least 60 Pas. In a particularly preferred embodiment, the first viscosity is greater than the second viscosity by at least 75 Pas, and/or the third viscosity is greater than the second viscosity by at least 75 Pas. In an especially preferred embodiment, the first viscosity is greater than the second viscosity by at least 85 Pas, and/or the third viscosity is greater than the second viscosity by at least 85 Pas. [0018] In one preferred embodiment, the first viscosity is at a temperature ranging from about 23 °C to about 28°C. In an especially preferred embodiment, the first viscosity is at a temperature about 26°C.
  • the second viscosity is at a temperature ranging from about 75°C to about 85°C. In an especially preferred embodiment, the second viscosity is at a temperature about 80°C.
  • the first viscosity, second viscosity and third viscosity are at constant shear. In an especially preferred embodiment, the first ' viscosity, second viscosity and third viscosity are at a shear of 100/s.
  • the intaglio printing ink is one that exhibits the following rheological properties at a constant shear rate of 100/s: a) a first viscosity at a temperature of 26°C; b) a second viscosity at a temperature of 80°C; and c) a third viscosity at a temperature of 26°C; wherein the first viscosity is greater than the second viscosity by at least 70 Pas; and the third viscosity is greater than the second viscosity by at least 70 Pas.
  • these unique rheological properties can be brought about by manipulating the solids content of the ink.
  • the present invention relates in a second embodiment to an intaglio printing ink comprising: a) a pigment; b) a vehicle; and c) optionally a modifier; wherein the intaglio printing ink has a solids content between about 92% to about 100%. In a preferred embodiment, the solids content ranges between about 96% to about 100%.
  • inventive inks contain little or no volatile organic components (NOC), for example, organic solvents.
  • NOC volatile organic components
  • the amount of NOC in the inventive inks is less than 8% by weight, preferably less than 4% by weight, based on the total weight of the ink.
  • the useful pigments are all those customarily used in the art of intaglio printing.
  • inorganic and organic pigments for example, CI Pigment Yellow 12, CI Pigment Yellow 42, CI Pigment Black 7, CI Pigment Black 11 , CI Pigment Red 9, CI Pigment Red 22, CI Pigment Red 23, CI Pigment Red 57:1, CI Pigment Red 67, CI Pigment Red 146, CI Pigment Red 224, CI Pigment Green 7, CI Pigment Green 36, CI Pigment Blue 15:3, CI Pigment Violet 23 and CI Pigment Violet 32.
  • the amount of pigment in the ink ranges from about 0.1 to about 40 % by weight, preferably from about 10 to about 30 % by weight, again based on the total weight of the ink.
  • the useful vehicles are all those customarily used in the art. Preference is given to those containing alkyd resins (air-curable or isocyanate curing,) for example, those sold under the name SY ⁇ OLAC, thermosetting acrylics (e.g. SYNACRYL), urethanes (thermosetting,) for example, those sold under the name UNITHANE, and polyesters (thermosetting,) for example, those sold under the name SYNOLAC.
  • the amount of vehicle in the ink ranges from about 40 to about 99.9 % by weight, preferably from about 40 to about 70 % by weight, again based on the total weight of the ink.
  • a modifier is optional, but, when present, can be selected from all those customarily used in the art, including driers, fillers, waxes, surfactants and the like.
  • driers Preferably, one or more of driers, fillers, waxes and/or surfactants are included in the ink composition.
  • Suitable driers are the heavy metal salts of complex fatty acids, present singly or as mixtures. Examples of useful driers are the octoates, resinates, naphthenates, neodecanoates, tallates and linoleates and mixtures thereof of metals such as cobalt, magnesium, manganese, zinc, cerium, zirconium and mixtures thereof.
  • a small amount, e.g. 0.1-1.0 wt. %, based on the weight of the ink, of a drier activator may be included in order to enhance the activity of the drier; a suitable drier activator is, for example, 2,21-bipyridyl.
  • the ink will contain one or more fillers in an amount of about 1 to 35 wt. %, based on the weight of the finished ink. Suitable fillers include china clay, calcium carbonate, calcium sulfate, talc, silica, corn starch, titanium dioxide, alumina and mixtures thereof.
  • the ink may also contain about 1 to 5 wt.
  • % based on the weight of the finished ink, of a wax.
  • Suitable waxes include carnauba waxes, polytetrafluoroethylene (PTFE) waxes, polyethylene waxes, Fischer-Tropsch waxes, silicone fluids and mixtures thereof.
  • PTFE polytetrafluoroethylene
  • silicone fluids and mixtures thereof.
  • non-ionic surfactants are especially preferred.
  • non-ionic surfactants suitable for use in the compositions according to the present invention include primary amines such as cocamine (available as Adagen 160D (TM) from Witco) and alkanolamides such as cocamide MEA (available as Empilan CME (TM) from Albright and Wilson), PEG-3 cocamide, cocamide DEA (available as Empilan CDE (TM) from Albright and Wilson), lauramide MEA (available as Empilan LME (TM) from Albright and Wilson), lauramide MIPA, lauramide DEA, and mixtures thereof.
  • the total amount of modifiers in the ink when present, ranges from about 0.1 to about 40 % by weight, preferably from about 0.1 to about 30 % by weight, again based on the total weight of the ink.
  • Tyvek inks A series of printing inks were prepared and designated "Tyvek inks" only because they were intended to be printed onto Tyvek substrate. However, these inks were suitable for printing onto other substrates, especially paper. The compositions of these Tyvek inks are shown below:
  • Tyvek Black 56 inlc which contained 3.6% Carnauba wax
  • Tyvek Black ink without wax was compared to (a) Tyvek Black ink without wax and (b) Tyvek Black containing 3.6% of PTFE (high melting) wax.
  • the respective inks were formulated as shown in Table 3 below:
  • the rheology of the inventive Tyvek inks differs from "conventional intaglio" as follows: 1. Higher viscosity at low shear rates (poorer flow at room temperature.) 2. Higher viscosity at high shear rates (room temperature.) [0042] It should be understood that the preceding detailed description of the invention is merely a detailed description of one preferred embodiment or of a small number of preferred embodiments of the present invention and that numerous changes to the disclosed embodiment(s) can be made in accordance with the disclosure herein without departing from the spirit or scope of the invention. The preceding detailed description of the invention, therefore, is not meant to limit the scope of the invention in any respect. Rather, the scope of the invention is to be determined only by the appended issued claims and their equivalents.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Printing Methods (AREA)
  • Credit Cards Or The Like (AREA)
  • Paper (AREA)
  • Financial Or Insurance-Related Operations Such As Payment And Settlement (AREA)

Abstract

La présente invention concerne des encres d'impression en creux présentant des propriétés rhéologiques uniques. Ces encres d'impression en creux sont extrêmement dépendantes de la température et quasiment indépendantes du cisaillement. Lesdites encres d'impression en creux présentent de préférence une faible teneur en composants organiques volatils. En raison de leurs propriétés rhéologiques uniques, les encres d'impression en creux sont excellentes pour une impression en creux sur du Tyvek et du papier, par exemple pour imprimer des documents de sécurité, tels que du papier-monnaie, des timbres postaux, des certificats d'actions, des billets de banque et similaire.
EP05728294A 2004-03-12 2005-03-14 Encres d'impression en creux presentant des proprietes rheologiques uniques Withdrawn EP1723207A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US55268104P 2004-03-12 2004-03-12
PCT/US2005/008399 WO2005090496A1 (fr) 2004-03-12 2005-03-14 Encres d'impression en creux presentant des proprietes rheologiques uniques

Publications (2)

Publication Number Publication Date
EP1723207A1 EP1723207A1 (fr) 2006-11-22
EP1723207A4 true EP1723207A4 (fr) 2008-10-01

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ID=34993673

Family Applications (1)

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EP05728294A Withdrawn EP1723207A4 (fr) 2004-03-12 2005-03-14 Encres d'impression en creux presentant des proprietes rheologiques uniques

Country Status (7)

Country Link
EP (1) EP1723207A4 (fr)
CN (1) CN101107332A (fr)
AU (1) AU2005224096A1 (fr)
BR (1) BRPI0508118A (fr)
CA (1) CA2559557A1 (fr)
MX (1) MXPA06010396A (fr)
WO (1) WO2005090496A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6165557A (en) * 1996-01-04 2000-12-26 Basf Coatings Ag Solvent-free coating compositions which can be cured with low emissions

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5569701A (en) * 1995-05-31 1996-10-29 Bureau Of Engraving And Printing Soybean oil-based intaglio ink and method for making same
CA2410088A1 (fr) * 1999-12-07 2001-06-14 Canadian Bank Note Company, Limited Encres d'impression en creux a dispersabilite et resistance chimique ameliorees

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6165557A (en) * 1996-01-04 2000-12-26 Basf Coatings Ag Solvent-free coating compositions which can be cured with low emissions

Also Published As

Publication number Publication date
MXPA06010396A (es) 2007-01-19
CN101107332A (zh) 2008-01-16
CA2559557A1 (fr) 2005-09-29
BRPI0508118A (pt) 2007-07-17
AU2005224096A1 (en) 2005-09-29
EP1723207A1 (fr) 2006-11-22
WO2005090496A1 (fr) 2005-09-29

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