EP1326751A2 - Dickungsmittel enthaltende beschichtungszusammensetzung zur herstellung einer blindplatte - Google Patents

Dickungsmittel enthaltende beschichtungszusammensetzung zur herstellung einer blindplatte

Info

Publication number
EP1326751A2
EP1326751A2 EP01977728A EP01977728A EP1326751A2 EP 1326751 A2 EP1326751 A2 EP 1326751A2 EP 01977728 A EP01977728 A EP 01977728A EP 01977728 A EP01977728 A EP 01977728A EP 1326751 A2 EP1326751 A2 EP 1326751A2
Authority
EP
European Patent Office
Prior art keywords
coating composition
water
coating
forming polymer
composition according
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.)
Granted
Application number
EP01977728A
Other languages
English (en)
French (fr)
Other versions
EP1326751B1 (de
Inventor
Ulrich Fiebag
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.)
Kodak Polychrome Graphics GmbH
Original Assignee
Kodak Polychrome Graphics GmbH
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 Kodak Polychrome Graphics GmbH filed Critical Kodak Polychrome Graphics GmbH
Publication of EP1326751A2 publication Critical patent/EP1326751A2/de
Application granted granted Critical
Publication of EP1326751B1 publication Critical patent/EP1326751B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N7/00—Shells for rollers of printing machines
    • B41N7/04—Shells for rollers of printing machines for damping rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N6/00—Mounting boards; Sleeves Make-ready devices, e.g. underlays, overlays; Attaching by chemical means, e.g. vulcanising

Definitions

  • This invention relates to non-photosensitive coating compositions, offset printing plates and dummy plates for offset printing comprising a non- photosensitive coating and a method for producing such printing plates and dummy plates.
  • the invention relates to non-photosensitive coating compositions comprising a thickening agent.
  • non-printing plates are mounted at those parts of the cylinder where no ink should be transferred to the web to be printed. These non-printing plates are called "dummy plates". Such dummy plates are also used in the case of multicolor printing. Dummy plates are printing plates without ink-accepting areas. The dummy plates transfer the fountain solution applied over the entire width of the cylinder to the web and at the same time must not take up the ink.
  • Roughened and anodically oxidized aluminum plates are commonly used as dummy plates.
  • such plates are very sensitive to fingerprints and other external influences like dust; fingerprints result in ink-accepting areas and thus smearing in the printing machine.
  • the hydrophilicity of such dummy plates decreases during use which again results in ink-accepting areas and thus smearing. It is therefore preferred that dummy plates be treated with a protective gum solution.
  • Coated dummy plates are for instance disclosed in EP-A-0 894 642 where the non-photosensitive water-soluble protective layer contains a water-soluble organic compound which contains at least one OH- or NH-acidic group having a pKa value of £ 8, and has a layer thickness which is smaller than the average roughness of the support material.
  • the water-soluble non-photosensitive layer contains at least one organic polymer with a water solubility of at least 2 g/1 at room temperature and at least one inorganic compound reacting as an acid.
  • a coating composition can be applied by a slot coater since the slot coater technology has some advantages compared with for instance roll coaters. For example, since there is no direct contact between substrate and coater, the substrate cannot be damaged by the slot coater. Furthermore, in slot coater technology a greater web speed can be used compared to roll coaters and the parameters of the coating like coating thickness can be adjusted more easily with a slot coater.
  • non-photosensitive coating composition which results in coatings with excellent properties, i.e. no longitudinal coating strips and no non-uniform coating thickness, and which on the other hand results in a fast roll-up and no toning when used as a coating for dummy plates. Furthermore, it should be possible to apply the coating composition by a slot coater in order to avoid mechanical damage of the substrate during coating.
  • the invention relates to a non-photosensitive coating composition comprising (a) at least one water-soluble film-forming polymer and (b) at least one high molecular thickening agent which shows thixotropic behavior.
  • the invention relates to an offset printing plate precursor comprising an overcoat obtainable by applying the coating composition of the invention on the photosensitive layer of the plate precursor.
  • the invention relates to a dummy plate for offset printing comprising a coating obtainable by applying the coating composition of the invention on a substrate.
  • the invention relates to a process for the production of a printing plate precursor or a dummy plate comprising applying the coating composition of the invention by means of a slot coater.
  • Figure 1 is a graph showing the relationship between viscosity and rpm of coating composition 1 in comparison to coating composition A.
  • non-photosensitive coating compositions according to the present invention comprise at least one water-soluble film-forming polymer and at least one high molecular thixotropic thickener.
  • the water-soluble film-forming polymer can be any polymer which is usually used as water-soluble low viscous binder in the field of overcoats on the photosensitive layer of printing plate precursors, as disclosed for instance in DE 197 32 902 which is incorporated herein by reference, or water-soluble film-forming binders in the field of gums as disclosed for instance in EP-A-0 790 530 which is incorporated herein by reference.
  • Suitable examples of such polymers are for instance polyvinyl alcohols (PVA), polyamides such as polyvinylpyrrolidone (PVP), low viscous water-soluble cellulose and derivatives thereof, partially saponified polyvinyl acetates, water- soluble dextrines and mixtures thereof. For dummy plates dextrines are especially preferred, while PVA and PVP are most preferred for overcoats.
  • PVA polyvinyl alcohols
  • PVP polyvinylpyrrolidone
  • the amount of the water-soluble film-forming polymer in the coating composition is not particularly limited and depends on the molecular weight of the polymer and the coating method to be used.
  • the amount is within the range of about 0.2 to about 20 wt% based on the total coating composition, more preferably about 0.2 to about 15 wt%; for slot coater application it is most preferably from about 0.2 to about 1 wt%, while for application with a roll coater the amount is most preferably from about 5 to about 15 wt%.
  • the thixotropic thickener can be any highly viscous polymer which shows thixotropy.
  • examples are for instance xanthan gum, high viscous cellulose and cellulose derivatives like hydroxyethyl cellulose, carboxymethyl cellulose and methyl cellulose, high viscous sodium alginate, guar gum, locust bean gum, gum karaya, gum tragacanth, high viscous starch, carrageenan, casein, hectorit, high viscous polyvinylpyrrolidone, high viscous polyvinyl alcohol and mixtures thereof.
  • Preferred are such thickeners which show thixotropic as well as pseudoplastic behavior.
  • Preferred thickeners are xanthan gum and high viscous hydroxy ethyl cellulose; xanthan gum is the most preferred one.
  • the amount of the thickener in the coating composition is not particularly limited, however, the amount of the thickener is preferably such that the viscosity of the coating composition at medium shear stress is within the range of about 2.5 to about 60 mPa-s, preferably about 5 to about 50 mPa-s when measured according to Brookfield, DV-II-LV at 20°C with a UL adapter; in most cases the amount of the thickener is from about 0.02 to about 0.2 wt% based on the total composition.
  • PVA polymer
  • PVAs having a molecular weight of about 15000 to 30000 and a viscosity (measured in a 4 % solution at 20°C according to Hoppler) of about 3 to about 8 mPa-s are useful as binder;
  • PVAs having a molecular weight of about 70000 to 100000 and a viscosity (measured in a 4 % solution at 20°C according to Hoppler) of about 30 to about 55 mPa-s are useful as thickeners.
  • the coating solutions contain water (preferably demineralized water), an organic solvent miscible with water (for example lower alcohols and glycols) or mixtures thereof as the solvent.
  • Preferred solvents are water and a mixture of water and a lower alcohol (for example isopropanol).
  • the amount of the solvent is not limited, however. Suitably the amount of the solvent is about 80 to about 99.6 wt% based on the total composition, more preferably about 94 to about 99.5 wt%.
  • the coating composition may further contain at least one of preservatives, surfactants, dyes, biocides, sequestering agents, antifoaming agents and corrosion inhibitors which are usually used in gum solutions.
  • Suitable surfactants are anionic surfactants such as sodium dodecyl sulphate, sodium dodecyl sulphonate, alkylamino carboxylates and dicarboxylates, cationic surfactants such as tetraalkyl ammonium salts, and non-ionic surfactants such as polyethylene glycols.
  • suitable preservatives are for instance p-hydroxybenzoic acid ester and 1,2- benzisothiazolin-3-on.
  • Useful sequestering agents are for instance polyphosphates,
  • Trilon ® (available from BASF, Germany) and Sequion from Polygon. Sodium nitrate, ammonium nitrate and ammonium carbamate are suitable corrosion inhibitors. Suitable antifoaming agents are for instance Agitan ® 290 (available from M ⁇ nzing, Germany), Silikon-Antischaum-Emulsion SE57 (available from Wacker Chemie, Germany) and Antimussol WLN (available from Sandoz, Switzerland).
  • the amount of the above listed additives is not particularly limited as long as they do not deteriorate the effect of the present invention obtained by the mixture of the film-forming polymer and the thickener.
  • the amount of the preservatives is about 0 to about 10 wt% based on the total amount of binder, preferably about 0.1 to 2 wt%, that of the surfactants is about 0 to 10 wt%, preferably about 0.05 to 0.5 wt%, that of the sequestering agents is about 0 to 5 wt%, preferably about 0.005 to 0.1 wt%, that of the antifoaming agents is about 0 to 1 wt%, preferably about 0.001 to 0.05 wt%, and that of the corrosion inhibitors is about 0 to 5 wt%, preferably about 0.1 to 1 wt% and the dyes are present in an amount of about 0 to 1 wt%, preferably about 0.005 to 0.05 wt%.
  • the coating compositions of the present invention are especially useful for the preparation of coated dummy plates, however, they can also be used for applying an overcoat on top of the photosensitive layer of a printing plate precursor as O 2 -barrier layer if the film-forming polymer is suitably chosen, i.e. is for instance polyvinyl alcohol.
  • Dummy plates according to the present invention comprise a substrate conventionally used for printing plates.
  • the substrate is selected from the group consisting of mechanically and/or electrochemically grained aluminum foil or plate, grained aluminum which was subjected to an anodizing treatment and plastic foils which may optionally be laminated to an aluminum foil.
  • the substrate for the dummy plates is the same as the substrate of the printing plate used in a certain printing process so that both plates show the same ink-water balance.
  • the coating composition of the present invention is applied to said substrate by usual means known to those of ordinary skill in the art.
  • the dry coating weight is preferably about 0.10 to about 0.25 g/m 2 , more preferably about 0.10 to about 0.15 g/m 2 .
  • any conventional coater like roll coater, bar coater, wire wound rod coater and air knife coater can be used, it is preferred to use a slot coater for applying the coating composition to the substrate.
  • the solid content of the coating composition to be applied is preferably about 0.2 to about 2 wt% of the total composition, more preferably about 0.3 to about 1.0 wt%.
  • the solid content of the coating composition be about 5 to about 20 wt% based on the total composition, more preferably about 8 to about 12 wt%.
  • the gap between the coating head and the substrate to be coated is held constant and is preferably about 100 to about 250 ⁇ m.
  • the substrate speed is preferably between about 20 and 80 m/min, more preferably about 30 to about 60 m/min.
  • the coating weight can be varied by varying the gap and the speed.
  • the coating composition of the invention can be applied to the photosensitive layer of a printing plate precursor.
  • the dummy plates produced according to the procedure described above neither show longitudinal coating stripes or wind pattern nor an inconsistent coating thickness which appears with dummy plates produced according to previous methods with coating solutions having low thixotropy.
  • the inventor believes that the coating composition can be applied evenly due to the thixotropic properties of the used thickener since the viscosity of the composition is reduced during coating by the shear stress. Due to the thixotropic behavior, the obtained dummy plates show excellent "coating cosmetics" without any defects such as bubbles and mottles.
  • the dummy plates according to the present invention can be economically produced by an automized production line, they are not sensitive to fingerprints and dust, do not tend to stick, are stable over a long storage time, show excellent hydrophilic properties and are therefore not sensitive to toning. After restart of the press, the dummy plates according to the invention show immediate roll-up.
  • Granules according to Example 1 of DE-C-42 01 660 were prepared by the use of the following components: 529.0 g dextrine (potato starch)
  • Trilon ® B tetrasodium salt of EDTA; available from BASF, Germany
  • a coating composition was prepared by mixing 94.9 wt% demineralized water, 5.0 wt% gum solution obtained as described above and 0.1 wt% Kelzan ® D (a xanthan gum, available from Langer & Co., Ritterhude/Germany) under stirring.
  • the viscosity of the composition at medium shear rate was determined to be 49.4 mPa-s (at 20°C) by using the Brookfield method (DV-II-LV with UL adapter). The viscosity of the composition versus rpm is shown in Fig. 1.
  • a coating composition was prepared by mixing 94.87 wt% demineralized water, 5.00 wt% gum solution obtained as described above, 0.1 wt% Kelzan ® D and 0.03 wt% l,2-benzisothiazolin-3-on under stirring. The viscosity was determined to be 49.5 mPa-s (at 20°C).
  • a coating composition was prepared by mixing 99.3 wt% demineralized water, 0.6 wt% Emdex ® 30 AN45 (dextrine available from Emsland-Starke GmbH, Emlichheim/Germany) and 0.1 wt% Kelzan ® D under stirring.
  • the viscosity was determined to be 48 mPa-s (at 20°C).
  • a coating composition was prepared by mixing 95.9 wt% demineralized water, 4.0 wt% gum solution obtained as described above and 0.1 wt% Rhodopol ® 23 (xanthan gum available from Rh ⁇ ne-Poulenc Industries, Paris/France) under stirring.
  • Coating composition 5 :
  • This composition was prepared by mixing the following components: 84.9 wt% demineralized water 10.0 wt% isopropyl alcohol 5.0 wt% gum solution obtained as described above
  • Comparative coating compositions A and B are Comparative coating compositions A and B:
  • Coating composition A differed from composition 1 in that no thickener was present (95.0 wt% water + 5.0 wt% gum solution as described above). Viscosity: 2 mPa-s (at 20°C).
  • Coating composition B differed from composition 2 in that no thickener was present (94.97 % water + 5.0 % gum solution as described above + 0.03
  • Viscosity 2 mPa-s (at 20°C).
  • the coating compositions according to the present invention showed excellent coating behavior.
  • the dummy plates obtained with coating compositions 1 to 5 showed immediate roll-up.

Landscapes

  • Paints Or Removers (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Macromonomer-Based Addition Polymer (AREA)
  • Cell Separators (AREA)
EP01977728A 2000-10-16 2001-10-12 Lithographische Blindplatte und Verfahren zu ihrer Herstellung Expired - Lifetime EP1326751B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US688402 1991-04-22
US68840200A 2000-10-16 2000-10-16
PCT/US2001/031863 WO2002032690A2 (en) 2000-10-16 2001-10-12 Coating composition with thickening agent for the production of dummy plates

Publications (2)

Publication Number Publication Date
EP1326751A2 true EP1326751A2 (de) 2003-07-16
EP1326751B1 EP1326751B1 (de) 2006-06-07

Family

ID=24764280

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01977728A Expired - Lifetime EP1326751B1 (de) 2000-10-16 2001-10-12 Lithographische Blindplatte und Verfahren zu ihrer Herstellung

Country Status (5)

Country Link
EP (1) EP1326751B1 (de)
JP (1) JP4042902B2 (de)
AT (1) ATE328746T1 (de)
DE (1) DE60120444T2 (de)
WO (1) WO2002032690A2 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1552954B1 (de) * 2004-01-09 2008-05-28 FUJIFILM Corporation Blindplattenvorläufer für Flachdruck
JP5237159B2 (ja) * 2009-03-11 2013-07-17 王子ネピア株式会社 吸収性物品の製造方法
DK2454099T3 (en) * 2009-07-14 2014-12-15 Felix Böttcher GmbH & Co KG Moisture System Rollers

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4201660C2 (de) * 1992-01-22 1996-11-21 Polychrome Gmbh Granulate für den Offsetdruck
US5741836A (en) * 1994-12-22 1998-04-21 Eastman Kodak Company Screen-printable ink-receptive compositions
TW367504B (en) * 1996-05-21 1999-08-21 Du Pont Photosensitive aqueous developable thick film composition employing vinylpyrrolidone polymer
CA2292498C (en) * 1997-06-16 2005-09-20 Avery Dennison Corporation Process for manufacturing tape products
DE19959952A1 (de) * 1998-12-14 2000-06-21 Mitsubishi Paper Mills Ltd Lithografische Druckplatte

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0232690A3 *

Also Published As

Publication number Publication date
JP2004526809A (ja) 2004-09-02
WO2002032690A2 (en) 2002-04-25
ATE328746T1 (de) 2006-06-15
JP4042902B2 (ja) 2008-02-06
DE60120444T2 (de) 2006-11-16
WO2002032690A3 (en) 2002-06-13
EP1326751B1 (de) 2006-06-07
DE60120444D1 (de) 2006-07-20

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