WO2009092743A2 - Ensemble amélioré de compositions d'encre d'impression - Google Patents

Ensemble amélioré de compositions d'encre d'impression Download PDF

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Publication number
WO2009092743A2
WO2009092743A2 PCT/EP2009/050676 EP2009050676W WO2009092743A2 WO 2009092743 A2 WO2009092743 A2 WO 2009092743A2 EP 2009050676 W EP2009050676 W EP 2009050676W WO 2009092743 A2 WO2009092743 A2 WO 2009092743A2
Authority
WO
WIPO (PCT)
Prior art keywords
printing
ink
tack
inks
yellow
Prior art date
Application number
PCT/EP2009/050676
Other languages
English (en)
Other versions
WO2009092743A3 (fr
Inventor
Martin THÜRING
Robert Howell
Lars Keller
Original Assignee
Sun Chemical Corporation
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
Priority claimed from PCT/EP2008/055121 external-priority patent/WO2008132192A1/fr
Application filed by Sun Chemical Corporation filed Critical Sun Chemical Corporation
Publication of WO2009092743A2 publication Critical patent/WO2009092743A2/fr
Publication of WO2009092743A3 publication Critical patent/WO2009092743A3/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/14—Multicolour printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/14—Multicolour printing
    • B41M1/18—Printing one ink over another
    • 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
    • C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/06—Lithographic printing

Definitions

  • the present invention relates to a set of printing inks, wherein the tack of the printing ink printed as the last one (the "last printed ink") has been reduced when compared to the printing ink printed as the first one (the "first printed ink") within the set.
  • An ink set is formed by all inks that are consecutively printed onto a single substrate during a single printing process.
  • the ink set according to the present invention consists of four differently coloured inks.
  • the colours black, cyan, magenta and yellow constitute an ink set.
  • the printing sequence preferably is black-cyan-magenta-yellow. Therefore, usually the yellow ink will have a reduced tack when compared to the black ink within the set according to the present invention.
  • the present invention also refers to a printing process making use of the set of printing ink compositions according to the present invention.
  • the improved set of printing inks according to the present invention and its application in a printing process solve the problem of back-trapping.
  • the problem of back-trapping occurs in many printing techniques.
  • the expression means that the reservoir for one of the printing inks is contaminated by another previously printed ink from the set, because this previously printed ink is drawn into the reservoir of the later printed ink. Consequently, back-trapping leads to an unclean printing result.
  • Once back-trapping has occurred it is very time-consuming to clean the printing press. Firstly, the reservoir of the contaminated printing ink has to be cleansed from the contaminated ink. Afterwards the contaminated rollers have to be cleansed in order to restore a satisfactory printing result. After having done the aforementioned steps, printing can be contin- ued for some time until back-trapping reoccurs. There are printing processes during which this happens every 15 to 30 minutes depending on the printing press.
  • Prior art documents do not address the tack differences between different print- ing inks forming an ink set.
  • the prior art did not reflect so far that tack modification of the first and last printed ink within a set, such as for example the black and yellow colored ink, can improve printing quality.
  • the back-trapping problem can be solved by lowering the tack of the last printed ink to a particular extent when compared to the tack of the first printed ink.
  • Inks are complex mixtures of many different components, all of which serve important purposes, it is not possible to randomly alter an ink composition.
  • Inks are usually composed of at least one pigment and at least one ink vehicle. Choice of ink has important impact on overall printing ink properties. Hence, the solution to the above-mentioned problem should therefore also be of such a nature that it could easily be applied to many different printing inks without running the risk of concomitantly influencing other important ink properties.
  • a set of printing inks wherein the tack of the last printed ink is reduced by at least 10 % when compared to the tack of the first printed printing ink is capable of avoiding back-trapping during printing processes. It is further preferred that the tack of the first printed printing ink is at least 15% lower and most preferred at least 20% lower than the tack of the first printed printing ink within the set of printing inks according to the present invention.
  • the tack of the last printed ink should not be reduced too far as it might happen that the tack is so low that the last printed ink will not transfer from the reservoir to the rollers or from the rollers to the paper. Therefore, tack reduction should preferably not exceed 50% when compared to the first printed ink. According to preferred embodiments, tack reduction should not exceed 30% when compared to the first printed ink.
  • Tack - a function of the force required to split a thin fluid film of a printing ink or vehicle between two rapidly separating surfaces; it is a rheological parameter indicative of internal cohesion of the fluid.
  • Tack of printing inks controls their high-speed transfer properties. It is also meaningful to predict paper picking in multi colour printing.
  • Fig. 1 shows a schematic drawing of a three-roller-tackmeter.
  • the operation principle of tack measurement instruments is as follows: A defined weight of printing ink is placed on a three roller system.
  • the roller system consists of a middle, metallic driving roller, a printing ink distribution roller and a measuring roller for tack determination. These two outer rollers are covered with an elastomeric layer. After speed adjustment and temperature stabilization the axial force on the measurement roller is determined. This axial force is used as indication of tack. The higher the axial force, the higher the determined tack number.
  • the last printed ink is a yellow coloured printing ink. It is further preferred that the first printed printing ink is black.
  • the teaching of the present invention can be applied to all printing inks and to all printing processes in which back-trapping occurs. However, these processes will usually be lithographic printing process. Therefore, the set of printing inks according to the present invention is preferably a set of lithographic printing inks. It is further preferred that the ink set is a set of offset printing inks. Offset printing inks are preferably inks selected from the group of sheet-fed offset, cold-set and heat-set offset. It is most preferred that the set of printing inks is a set of heat-set offset printing inks, preferably heat-set web offset (HSWO) printing inks.
  • HSWO heat-set web offset
  • Offset printing inks are preferably characterized by a composition comprising about 10 to 20% by weight of pigments.
  • the pigments may for example be added as pigment pastes or dry pigments. If the pigment is added in form of pigment paste, the printing ink compositions preferably comprise pigment pastes in amounts of between 1 % and 60% by weight, preferably between 25% and 50% by weight and most preferably between 30% and 45% by weight. If dry pigments are used, the respective amounts are 1 to 30% by weight, preferably 10 to 25% by weight and most preferably between 15 and 20% by weight.
  • Preferred pigments are conventional organic or inorganic pigments, most preferred are Diarylide Yellow (for example pigment yellow 12, 13, 14, 174), Lithol Rubine Magenta (for example pigment magenta 57:1 ), Phthalocyanine Cyan (for example pigment cyan 15:3), Carbon Black for printing inks (for example pigment black 7).
  • the ink compositions present in the ink sets of the present invention preferably comprise solvents in amounts of from 10 to 50% by weight. These solvents are preferably hydrophobic which means that they show a distribution coefficient D between n-octanol and water that is at least above 3 and preferably in a range of from 3.9 to 8.0.
  • at least one solvent is a mineral oil solvent.
  • the inks within the printing ink sets of the present invention preferably comprise resins in amounts of from 10 to 25% by weight.
  • resins are rosin modified phenolic resins, maleic resins, rosin esters or hydrocarbon types.
  • additives are present to adjust the ink water balance.
  • These additives can be ionic, non-ionic or amphoteric surfactants but also polyols, oleate or amine derivates as well as oleamides.
  • the last printed printing ink comprises up to 10% by weight of a tack reducing agent.
  • this agent is present in amounts of from 1 % by weight to 6% by weight, preferably from 1 .5 % by weight up to 6 % by weight based on the printing ink composition.
  • Tack reducing agents preferred according to the present invention are compounds with a boiling point of between 300 and 500 0 C. Preferably, these compounds have a melting point of between 30 and 60 0 C.
  • hydrocarbon compounds comprising at least one aliphatic hydrocarbon with at least 15 carbon atoms is added as the tack reducing agent.
  • Examples for preferred tack reducing agents are polyethylene (PE) wax and petrolatum. Petrolatum is a mixture of solid and liquid hydrocarbons with chain lengths between 20 and 30 carbon atoms.
  • the tack reducing agent is substituted by halogen, preferably fluorine.
  • halogen preferably fluorine.
  • a preferred example is polytetrafluoroethylene (PTFE wax).
  • petrolatum is present in the last printed ink in amounts of from 3% by weight to 5% by weight and more preferred in amounts of from 4% by weight.
  • the printing ink composition according to the invention preferably comprises at least one varnish in an amount of from 15 to 30% by weight.
  • the varnish comprises at least one vegetable oil, preferably stand oil.
  • all printing inks within the set of printing inks except the last printed ink are substantially free of the tack reducing agents described above, i.e. these inks have higher tacks than the last printed ink composition described herein.
  • the expression “substantially free” is understood in such that the respective compound has not been purposefully added to the composition.
  • the present invention also refers to the use of the set of printing inks as defined herein in a printing process.
  • This process preferably is a lithographic printing process. It is further preferred that the process is an offset printing process. Offset printing processes are preferably selected from the group of sheet-fed offset, cold-set and heat-set offset processes. It is most preferred that the set of printing inks according to the present invention is used in a heat-set offset printing process.
  • the printing process according to the present invention comprises the step of applying to a substrate a set of printing inks wherein the last printed ink has reduced tack when compared to the first printed ink, i.e. the set of printing inks de- scribed above.
  • the invention is most preferably directed to a heat-set offset printing process comprising the step of applying to a substrate a set of printing inks wherein the last printed ink has reduced tack when compared to the first printed ink.
  • the printing process is a process of consecutively print- ing four printing inks on the substrate.
  • the sequence of inks is preferably black- cyan-magenta-yellow.
  • the set of printing inks is printed on paper.
  • the set of printing inks preferably consists of four printing inks with the above described properties.
  • the second and third printed printing ink may have higher or lower tacks than the first printing inks.
  • the second printing ink has a higher tack than the first print- ing ink.
  • the second printed printing ink has a tack that is at least 5% higher than the tack of the first printed ink.
  • This ink set is based on “1/3 varnish” and varnish “7131 ", which are described in WO 2008/132192.
  • the printing ink composition comprises pigment paste (pigment level 30%).
  • Mineral oil B solvents with low boiling range (210-230 0 C) were chosen for improved drying.
  • Mineral oil C solvents with medium boiling range (240-270 0 C) were chosen.
  • a high pigment level allows thin printing ink films on printing press which speeds up drying. In order to solve the back-trapping problem, the tack of the yellow printing ink was reduced by using petrolatum.
  • composition of printing ink Series according to the present invention is a composition of printing ink Series according to the present invention.
  • the components of the printing ink were mixed in a dissolver at temperatures up to 6O 0 C.
  • the following example shows that the set of printing inks according to the present invention is effective in solving the back-trapping problem that would usually have occurred in the described process.
  • This example is divided into several "printing steps”. Each printing step is a test printing wherein four inks with different colors are printed on paper. From step to step the tacks of defined inks are modified. Each printing step contributed to show that surprisingly the tack difference between first and last printed ink is the decisive factor in solving the back-trapping problem.
  • the first printing step was done with a conventional ink set (series 12100 as described in WO 2008/132181 ).
  • the paper was a conventional 65 gsm paper. This step was conducted in order to have obtain a printed paper showing back- trapping as it appears with printing inks known in the art. As expected significant back-trapping occurred.
  • the yellow roller and container were blatantly contaminated by the black ink.
  • the black printing ink was changed to another ink (series 12000 as described in WO 2008/132181 ) which had higher tack than the black ink used in the first step. There was less back trapping when compared to the first step.
  • the yellow coloured printing ink was replaced by a modified yellow ink with lower tack than the one used in the steps before. Modifying the yellow printing ink to an ink with lower tack decreased back- trapping significantly.
  • the set of inks was designed such that the tack of all inks forming the set was reduced (see ink 16000 in WO 2008/132190) within which all the tacks of the printing inks are reduced. There was back trapping.
  • the black coloured ink in the set was modified in order to reduce its tack. There was even more back trapping.
  • a seventh step petrolatum was added to the yellow coloured ink.
  • the black ink was not modified. No back-trapping could be observed.
  • polyethylene wax was added to the yellow coloured ink.
  • the black ink was not modified. There was no back-trapping and simultaneously the slip of the resulting prints was improved.
  • the concept of the present invention is able to solve the back-trapping problem for different printing ink sets.
  • the modification of the tack of the black coloured ink does not solve the back- trapping problem. Rather, the tack of the yellow ink relative to the black ink must be lowered to achieve the advantageous result of no visible back-trapping in accordance with the invention.
  • tack reducing agent does not seem to play an important role as the effect can be achieved, for example, with petrolatum or PE wax.
  • the outcome of this test is actually surprising as the person of ordinary skill in the art would have thought that the tack of the black, i.e. the first printed, ink had to be reduced in order to solve back-trapping. This is due to two factors: 1. It is the black ink, which sticks to the yellow roller and is thus carried to the yellow ink container, therefore it would be obvious to reduce the tack (aka stickiness) of the black ink. 2.
  • Tack measurement was conducted with a Tack-o-scope® instrument using a speed of 300 m/min.
  • Table 1 Tack measurement was conducted with a Tack-o-scope® instrument using a speed of 300 m/min.
  • Y - K defines the tack difference between the yellow and the black colored ink within the ink set.
  • tack reduction of the last printed ink has to amount to at least 10% in comparison to the first printed ink (black in this case) in order to solve the back-trapping problem. If, in contrast, the last printed ink had a higher tack than the first printed, severe back-trapping occurred.
  • the table below shows results of a printing trial on a sheet-fed printing machine. Tack measurements were conducted with a Tack Thwing Albert Instrument at a speed of 800 rpm.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (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

L'invention porte sur un ensemble d'encres d'impression, l'adhérence de l'encre d'impression imprimée en dernier ayant été réduite d'au moins 10 % par rapport à celle de l'encre d'impression imprimée en premier à l'intérieur de l'ensemble. L'ensemble d'encres d'impression et un procédé d'impression respectif procurent une solution au problème de glaçage.
PCT/EP2009/050676 2008-01-21 2009-01-21 Ensemble amélioré de compositions d'encre d'impression WO2009092743A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US2242108P 2008-01-21 2008-01-21
US61/022,421 2008-01-21
PCT/EP2008/055121 WO2008132192A1 (fr) 2007-04-25 2008-04-25 Composition d'encre d'impression jaune faiblement poisseuse
EPPCT/EP2008/055121 2008-04-25

Publications (2)

Publication Number Publication Date
WO2009092743A2 true WO2009092743A2 (fr) 2009-07-30
WO2009092743A3 WO2009092743A3 (fr) 2009-09-17

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Family Applications (1)

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PCT/EP2009/050676 WO2009092743A2 (fr) 2008-01-21 2009-01-21 Ensemble amélioré de compositions d'encre d'impression

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Country Link
WO (1) WO2009092743A2 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1547283A (en) * 1975-06-04 1979-06-06 Mallinckrodt Inc Planograpic printing ink
US4304601A (en) * 1975-06-04 1981-12-08 Mallinckrodt, Inc. Planographic printing ink
WO1994006873A1 (fr) * 1992-09-17 1994-03-31 Deluxe Corporation Composition d'encre et procede de fabrication, d'utilisation et de recuperation de cette composition
US20070081062A1 (en) * 2005-09-30 2007-04-12 Fuji Photo Film Co., Ltd. Ink set and inkjet image recording method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1547283A (en) * 1975-06-04 1979-06-06 Mallinckrodt Inc Planograpic printing ink
US4304601A (en) * 1975-06-04 1981-12-08 Mallinckrodt, Inc. Planographic printing ink
WO1994006873A1 (fr) * 1992-09-17 1994-03-31 Deluxe Corporation Composition d'encre et procede de fabrication, d'utilisation et de recuperation de cette composition
US20070081062A1 (en) * 2005-09-30 2007-04-12 Fuji Photo Film Co., Ltd. Ink set and inkjet image recording method

Also Published As

Publication number Publication date
WO2009092743A3 (fr) 2009-09-17

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