WO2001038445A1 - Intaglio printing inks - Google Patents
Intaglio printing inks Download PDFInfo
- Publication number
- WO2001038445A1 WO2001038445A1 PCT/AU2000/001421 AU0001421W WO0138445A1 WO 2001038445 A1 WO2001038445 A1 WO 2001038445A1 AU 0001421 W AU0001421 W AU 0001421W WO 0138445 A1 WO0138445 A1 WO 0138445A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- intaglio
- ink
- film
- printed substrate
- curing
- Prior art date
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
- This invention relates to printing inks and in particular to printing inks known as Intaglio printing inks.
- the invention also relates to a process of obtaining a dry Intaglio printing ink film on a substrate.
- Intaglio printing is a process whereby an image is transferred to a sheet of paper or other substrate from a plate with recessed portions, where printing ink is located in the recessed portions of the plate. After transfer of the printing ink to the paper or other substrate the ink may be dried either under ambient conditions or under forced drying conditions of elevated temperatures and/or increased air flow. The printing ink also dries or cures by undergoing chemical reactions.
- the Intaglio technique is well known and produces high quality raised images that can be used for the manufacture of banknotes and other documents as well as for artworks.
- One of the features of the Intaglio printing technique is that the film build of the printing ink that is transferred to the paper or other substrate may vary from a few microns to fifty microns or more. This ability to vary the film build is a desirable feature of Intaglio printing and may be used to advantage to produce embossing and other desirable features such as tactility without embossing. This feature also distinguishes inks suitable for use as Intaglio inks from other printing inks.
- EP 486092 discloses fatty acid resinous derivatives of starch type polyether polyols.
- the acid value of the resins have acid values of about 10 mgKOH/g. There is no suggested use as Intaglio inks.
- EP 750026 (Sun Chemical) relates to Intaglio printing inks.
- the resins disclosed in that citation are addition polymerised modified epoxy resin fatty acid esters.
- the epoxy resin is bisphenol A type resin which are polyethers. ' After application, the inks are thermally cured.
- This invention provides in one form an Intaglio ink wherein the binder includes an autoxidisable polyester resin with a fatty acid content in the range 40 - 60% by weight, more preferably 45 - 55% and most preferably 47 - 52%.
- the fatty acid has at least 25% of its chain as linolenic acid, more preferably at least 40%.
- the iodine value of the fatty acid is at least
- the fatty acid is selected from the group consisting of linseed fatty acid, tung oil fatty acid or synthetic equivalents.
- the fatty acid is linseed fatty acid.
- the acid value of the resin is in the range 40 - 80 mg KOH/g of resin and more preferably 50 - 70 mg KOH/g of resin and most preferably 55 - 65 mg KOH/g of resin.
- the resin has a viscosity as measured by Gardner-Holt viscosity bubble tubes in the range R - Y and more preferably T - X and most preferably T - W when measured as a 60% solution in ethyl di-icinol (monoethyl ether of diethyleneglycol).
- This invention provides in an alternative form an Intaglio ink which comprises: 20 - 40% an autoxidisable polyester resin 10 - 30% organic solvents 1 - 60%, preferably 1 - 50% pigments 0 - 5% catalysts wherein the autoxidisable polyester resin is as described above.
- the ink composition further comprises a wax dispersion.
- the glass transition temperature (Tg) of the wax dispersion is preferably less than the maximum temperature achieved during the printing process and more preferably more than 20°C less than the maximum temperature achieved during the printing process.
- Suitable wax dispersions include polyurethane dispersions and micronised polyolefin dispersions.
- the invention provides in a further form a method for preparing an Intagho printed substrate by applying a film of Intaglio ink as described above, exposing the film to a UV light source and curing the ink.
- the solvent present in the Intaglio printing ink composition may consist of a single solvent. However it is preferred that a mixture of solvents is used. Different solvents may be used to influence various properties of the ink composition, including viscosity, ink stability and transfer properties. Solvents that are released reasonably quickly from the inked substrate may be useful as their release will tend to aid the time to achieve satisfactory "set-off. Illustrative of such solvents are aliphatic type blends of hydrocarbons that have boiling points in the range 150- 270°C.
- Slower solvents may also be used in conjunction with these hydrocarbon solvents and these other solvents may be retained to a certain extent after the ink has dried. Effectively these solvents, at their residual levels, can function as plasticisers and provide greater levels of flexibility to the dried ink. Examples of such solvents are glycols and ether - glycols. Good flexibility in the dried ink is particularly preferred with bank notes where the notes are frequently subjected to bending, flexing and folding.
- Driers that may be used in the ink compositions of the present invention include the transition metal salts commonly used in accelerating the drying of alkyd or oil based house paints.
- a particularly preferred drier is a combination of cobalt and manganese. These metals are usually in the form of soluble or compatible salts such as, for example, cobalt naphthenate or cobalt octoate. Some of the metal driers facilitate surface cure while others enhance through cure. In certain embodiments of the present invention it is believed to be desirable to achieve a greater amount of surface cure compared to through cure. It is believed this surface cure will lead to the desired "set-off property while the lack of extensive through cure will assist in increasing the flexibility of the film.
- the pigments that may be used in the printing ink compositions of the present invention include those commonly used in printing inks. Examples include organic pigments, carbon black and iron oxide. The levels of pigment present may vary depending on the particular application but are generally in the range of 5 -
- Pigments also include fillers and extenders.
- the pigments may be dispersed using the Intaglio ink resin as a pigment dispersant.
- This resin functions effectively as a pigment dispersant and this is believed to be a consequence of the relatively high acid value of the resin.
- pigment dispersant may be used and in this case the pigment dispersant would be an additional ingredient in the Intaglio printing ink composition.
- the acid value of the resin is in the range 40 - 80 mg KOH/g of resin and more preferably 50 - 70 mg KOH/g of resin and most preferably 55 - 65 mg KOH g of resin.
- the resin has a viscosity as measured by Gardner-Holt viscosity bubble tubes in the range R - Y and more preferably T - X and most preferably T -
- Intaglio ink further comprises a photoinitiator.
- this invention provides a process of preparing a dry Intaglio printing ink on a substrate, the process comprising the steps of transferring an Intaglio printing ink from a plate to a substrate at a temperature in the range 60 - 90°C, more preferably 80 - 84°C, irradiating the printed substrate from a UV radiation source.
- UV curable coatings has been known for many years.
- a particularly well known example is that of any clear finishes over timber substrates.
- UV curable coatings are particularly applicable to clear, unpigmented coatings.
- the presence of pigments tends to limit the penetration of UV radiation and hence has not been as widely used in pigmented coatings.
- the general composition of UV coatings includes resins or polymers as binders that have addition polymerisable ethylenic unsaturation. Typically these resins or polymers as well as oligomers or monomers, have multi-functional addition polymerisable unsaturation. Examples include polyols that have been modified as poly aery lates, such as trimethylolpropane triacrylate, and pentaerythritol tri and tetra acrylate.
- Photoinitiators are commonly used in such compositions to accelerate the rate of cure or crosslinking.
- Polyester resins or polymers that include fatty acid side chains are well known in coating technology. They are referred to as alkyds. They are used as the binders in household “oil” paints. Coatings prepared using alkyd resins as binders form films both by evaporation of solvent as well as chemical reaction utilising oxygen in the atmosphere. They are generally referred to as autoxidisible coatings as a result of the mechanism of curing involving atmospheric oxygen.
- the fatty acids that are used as binders in household coatings are derived from naturally occurring soya or safflower oils. Linseed fatty acids are generally not used because of problems with yellowing.
- the percentage of fatty acid present is usually about 60% by weight. Typical alkyd based coatings take 2- 4 hours to achieve tack free condition. While lower levels of fatty acid lead to improve "tack-free" times the best balance of properties is achieved at about the 60% level of fatty acid. Lower levels of fatty acids generally require the presence of aromatic solvents which are undesirable for domestic applications. Generally improved "tack-free” times are achieved with lower percentages of fatty acids and these binders are used in industrial applications. "Tack-free” is generally achieved in such applications by evaporation of solvent alone. The mechanism of curing alkyd based coatings has been widely studied.
- the polyester resin of the present invention may be prepared by known methods that are applicable to the preparation of alkyds.
- the composition of the polyester binders of the present invention may be varied within the parameters outlined in the Summary of the Invention. It is preferred that the acid value of the resins is relatively high and it is believed this contributes to good adhesion to the substrate, particularly when these are polymer substrates used for bank notes. As discussed previously, it also aids pigment dispersion
- the polyester resin of the present invention preferably includes at least 20% by weight of aromatic polyfunctional carboxylic acids and it is believed this contributes to a relatively high Tg of the polyester backbone. This relatively high aromatic content is believed to assist in obtaining satisfactory "set-off. While the resins are described as polyesters other minor levels of non ester groups may be incorporated. However the polymer backbone of the resin is required to be essentially a polyester. Minor amounts of amide or ether groups could also be included.
- the printing inks of the present invention may be used conventionally, that is without UV radiation. However, generally improved results are achieved when they are subjected to UV radiation. Typically when used conventionally "set-off is adequate to allow 250 sheets to be stacked. However, with UV irradiation 2,000 - 3,000 sheets may be stacked. Generally, the Intaglio printing is carried out at 80 - 84°C as a primary source of heat, and curing/drying continues afterwards at normal temperatures. The curing may be accelerated with other radiation. We have found that by using a combination of heated plates and a UV system incorporating exhaust ventilation, acceptable initial cure of the ink is achieved. Generally UV systems have a significant infra-red component which assists thermal curing/drying. In this alternative embodiment involving UV curing photoinitiators may also be used. These initiators that are well known in the UV curing of coatings, for example Irgacure 184 (ex Ciba-Geigy).
- fillers or extenders can be used to vary the gloss of the printing ink image. These are included within the pigment category and include calcium carbonate as an example.
- the driers or catalysts that may be used are well known. Some driers are known more as “surface driers", while other driers are known as "through driers". The selection of driers for the present invention may be made to obtain the requisite balance of properties. It is believed desirable in many banknote applications that "through dry" is limited. This ensures adequate flexibility of the printing ink.
- the UV irradiation accentuates the "surface cure” and hence to an extent limits the "through cure”.
- Minor amounts of other binders as well as plasticisers may be used without detracting from the properties of the compositions of the present invention.
- the printing inks of the present invention are particularly suitable for plastic substrates, they can also be used on other substrates such as cellulosic type substrates.
- the compositions are particularly useful on polymer substrates used for security documents such as banknotes.
- the types of apparatus that may be used to irradiate the sheets of substrate may vary but generally involve the exposure of a substrate to which the printing ink has been applied for a short period of time with UV radiation.
- Stage A was charged to the stirred reactor and B to E stages were added in that order.
- the reactants were heated to 182°C and maintained at that temperature until
- the batch was then heated to 260°C again ensuring that the column head temperature was maintained below 110°C. After a total of 104 mis of water had been collected the acid value was monitored until it was in the range 6 - 9 mg KOH/g and the batch was clear.
- the Gardner Holt viscosity was in the range A - C as measured in a 60% solution in ethyl di-icinol. Total water removed was 123ml.
- This example illustrates the preparation and testing of an Intaglio printing ink composition.
- the printing ink composition was prepared by combining the above ingredients. The ink was then tested by exposing a film of thickness 50 ⁇ m thickness to 150 Watts/cm of UV irradiation at a distance of 75mm. The films were then assessed for set-off after passes of the film across the UV radiation source. After five passes the film was rated as very good while after four passes it was rated as fair.
- Example 3
- Example 2 was repeated but with a resin similar to Example 1 except that the fatty acid content was 49% rather than 44%.
- the fatty acid content of this example was higher than Example 2, the "set-off was improved. This is contrary to the expected result for "tack-free" behaviour for alkyds.
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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)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NZ518898A NZ518898A (en) | 1999-11-22 | 2000-11-22 | Intaglio printing inks using linseed fatty acid as the autoxidisable polyester resin |
CA002391847A CA2391847A1 (en) | 1999-11-22 | 2000-11-22 | Intaglio printing inks |
EP00977309A EP1268687A4 (en) | 1999-11-22 | 2000-11-22 | Intaglio printing inks |
AU15045/01A AU1504501A (en) | 1999-11-22 | 2000-11-22 | Intaglio printing inks |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPQ4173 | 1999-11-22 | ||
AUPQ4173A AUPQ417399A0 (en) | 1999-11-22 | 1999-11-22 | Intaglio printing inks |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001038445A1 true WO2001038445A1 (en) | 2001-05-31 |
Family
ID=3818317
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU2000/001421 WO2001038445A1 (en) | 1999-11-22 | 2000-11-22 | Intaglio printing inks |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1268687A4 (en) |
AU (2) | AUPQ417399A0 (en) |
CA (1) | CA2391847A1 (en) |
NZ (1) | NZ518898A (en) |
WO (1) | WO2001038445A1 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2412660A (en) * | 2004-04-01 | 2005-10-05 | Sun Chemical Ltd | Energy-curable intaglio printing inks |
WO2005097927A1 (en) * | 2004-04-01 | 2005-10-20 | Sun Chemical Corporation | Energy-curable intaglio printing inks |
GB2418204A (en) * | 2004-09-21 | 2006-03-22 | Sun Chemical Ltd | Energy-curable intaglio printing inks |
EP1650042A1 (en) | 2004-10-20 | 2006-04-26 | JDS Uniphase Corporation | Method of alignment of magnetic particles in a paste-like ink, and the printing of optical effects |
WO2009013169A1 (en) | 2007-07-20 | 2009-01-29 | Sicpa Holding S.A. | Intaglio printing inks |
US7615110B2 (en) * | 2004-04-01 | 2009-11-10 | Sun Chemical Corporation | Photoinitiators for use in intaglio printing inks |
US20100162909A1 (en) * | 2007-07-09 | 2010-07-01 | Sicpa Holding S.A. | Vanadium-Drier Intaglio Ink |
EP2828090B1 (en) | 2012-03-23 | 2016-05-11 | Sicpa Holding SA | Printing method with oxidative-drying intaglio ink and uv-vis-curable intaglio inks |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3557691A (en) * | 1968-06-25 | 1971-01-26 | Owens Illinois Inc | Electrostatic stencil printing process utilizing polyester-alkyd resin powder |
US4107012A (en) * | 1972-04-29 | 1978-08-15 | Bayer Aktiengesellschaft | Monomer-free resin compositions, based on unsaturated polyesters, which can be cured by UV-light |
JPH03273068A (en) * | 1990-03-20 | 1991-12-04 | Toyo Ink Mfg Co Ltd | Ink for printing on metal |
US5178672A (en) * | 1991-04-08 | 1993-01-12 | Canadian Fine Color Company Limited | Printing compositions |
US5569701A (en) * | 1995-05-31 | 1996-10-29 | Bureau Of Engraving And Printing | Soybean oil-based intaglio ink and method for making same |
JPH1095945A (en) * | 1996-09-24 | 1998-04-14 | Nisshin Oil Mills Ltd:The | Ultraviolet-curable ink composition |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4446301A (en) * | 1983-08-03 | 1984-05-01 | Eastman Kodak Company | Modified polyesters |
DE3414122A1 (en) * | 1984-04-14 | 1985-10-17 | Wolfgang 8451 Ebermannsdorf Judex | Printing ink for printing surfaces of polypropylene and/or polyethylene |
DE4308108A1 (en) * | 1993-03-15 | 1994-09-22 | Hoechst Ag | Phenolic resin-modified natural resin acid esters, processes for their preparation and their use as binder resins in printing inks |
US5597884A (en) * | 1993-03-15 | 1997-01-28 | Hoechst Aktiengesellschaft | Phenolic-resin-modified natural resin acid esters, a process for their preparation and their use as binder resins in printing inks |
FR2725454B1 (en) * | 1994-10-06 | 1998-02-27 | Schmidt Gebr Druckfarben | USE OF AN AQUEOUS PREPARATION OF PRINTING INKS FOR MANUFACTURING PUBLICATIONS, OBTAINED IN LARGE NUMBERS AND INKS |
US5559206A (en) * | 1995-03-01 | 1996-09-24 | Arizona Chemical Company | Partially esterified rosin based resins |
-
1999
- 1999-11-22 AU AUPQ4173A patent/AUPQ417399A0/en not_active Abandoned
-
2000
- 2000-11-22 NZ NZ518898A patent/NZ518898A/en unknown
- 2000-11-22 CA CA002391847A patent/CA2391847A1/en not_active Abandoned
- 2000-11-22 WO PCT/AU2000/001421 patent/WO2001038445A1/en not_active Application Discontinuation
- 2000-11-22 EP EP00977309A patent/EP1268687A4/en not_active Withdrawn
- 2000-11-22 AU AU15045/01A patent/AU1504501A/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3557691A (en) * | 1968-06-25 | 1971-01-26 | Owens Illinois Inc | Electrostatic stencil printing process utilizing polyester-alkyd resin powder |
US4107012A (en) * | 1972-04-29 | 1978-08-15 | Bayer Aktiengesellschaft | Monomer-free resin compositions, based on unsaturated polyesters, which can be cured by UV-light |
JPH03273068A (en) * | 1990-03-20 | 1991-12-04 | Toyo Ink Mfg Co Ltd | Ink for printing on metal |
US5178672A (en) * | 1991-04-08 | 1993-01-12 | Canadian Fine Color Company Limited | Printing compositions |
US5569701A (en) * | 1995-05-31 | 1996-10-29 | Bureau Of Engraving And Printing | Soybean oil-based intaglio ink and method for making same |
JPH1095945A (en) * | 1996-09-24 | 1998-04-14 | Nisshin Oil Mills Ltd:The | Ultraviolet-curable ink composition |
Non-Patent Citations (3)
Title |
---|
DATABASE WPI Derwent World Patents Index; Class A97, AN 1992-027493, XP002957560 * |
DATABASE WPI Derwent World Patents Index; Class A97, AN 1998-280514, XP002957559 * |
See also references of EP1268687A4 * |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7615110B2 (en) * | 2004-04-01 | 2009-11-10 | Sun Chemical Corporation | Photoinitiators for use in intaglio printing inks |
WO2005097927A1 (en) * | 2004-04-01 | 2005-10-20 | Sun Chemical Corporation | Energy-curable intaglio printing inks |
GB2412660A (en) * | 2004-04-01 | 2005-10-05 | Sun Chemical Ltd | Energy-curable intaglio printing inks |
GB2418204A (en) * | 2004-09-21 | 2006-03-22 | Sun Chemical Ltd | Energy-curable intaglio printing inks |
EP1650042A1 (en) | 2004-10-20 | 2006-04-26 | JDS Uniphase Corporation | Method of alignment of magnetic particles in a paste-like ink, and the printing of optical effects |
US20100162909A1 (en) * | 2007-07-09 | 2010-07-01 | Sicpa Holding S.A. | Vanadium-Drier Intaglio Ink |
US8807036B2 (en) * | 2007-07-09 | 2014-08-19 | Sicpa Holding Sa | Vanadium-drier intaglio ink |
WO2009013169A1 (en) | 2007-07-20 | 2009-01-29 | Sicpa Holding S.A. | Intaglio printing inks |
EA018132B1 (en) * | 2007-07-20 | 2013-05-30 | Сикпа Холдинг Са | Intaglio printing inks composition, process for producing and use thereof |
AU2008280231B2 (en) * | 2007-07-20 | 2013-05-30 | Sicpa Holding Sa | Intaglio printing inks |
AU2008280231B9 (en) * | 2007-07-20 | 2013-06-27 | Sicpa Holding Sa | Intaglio printing inks |
AP2818A (en) * | 2007-07-20 | 2013-12-31 | Sicpa Holding Sa | Intaglio printing links |
US8636307B2 (en) | 2007-07-20 | 2014-01-28 | Sicpa Holding Sa | Intaglio printing inks |
EP2828090B1 (en) | 2012-03-23 | 2016-05-11 | Sicpa Holding SA | Printing method with oxidative-drying intaglio ink and uv-vis-curable intaglio inks |
Also Published As
Publication number | Publication date |
---|---|
NZ518898A (en) | 2002-10-25 |
EP1268687A1 (en) | 2003-01-02 |
EP1268687A4 (en) | 2003-01-29 |
CA2391847A1 (en) | 2001-05-31 |
AU1504501A (en) | 2001-06-04 |
AUPQ417399A0 (en) | 1999-12-16 |
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