WO2002068549A2 - Matieres d'enduction pour impression par jet d'encre - Google Patents

Matieres d'enduction pour impression par jet d'encre Download PDF

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Publication number
WO2002068549A2
WO2002068549A2 PCT/EP2002/001559 EP0201559W WO02068549A2 WO 2002068549 A2 WO2002068549 A2 WO 2002068549A2 EP 0201559 W EP0201559 W EP 0201559W WO 02068549 A2 WO02068549 A2 WO 02068549A2
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WO
WIPO (PCT)
Prior art keywords
coating
coating slips
ink
polymers
vinylformamide
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Application number
PCT/EP2002/001559
Other languages
German (de)
English (en)
Other versions
WO2002068549A3 (fr
Inventor
Friedrich Linhart
Bernd Dirks
Heinrich Ullrich
Thierry Blum
Original Assignee
Basf Aktiengesellschaft
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 Basf Aktiengesellschaft filed Critical Basf Aktiengesellschaft
Priority to AU2002238552A priority Critical patent/AU2002238552A1/en
Publication of WO2002068549A2 publication Critical patent/WO2002068549A2/fr
Publication of WO2002068549A3 publication Critical patent/WO2002068549A3/fr

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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
    • C09D157/00—Coating compositions based on unspecified polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C09D157/06—Homopolymers or copolymers containing elements other than carbon and hydrogen
    • C09D157/12—Homopolymers or copolymers containing elements other than carbon and hydrogen containing nitrogen atoms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
    • 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
    • C09D139/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Coating compositions based on derivatives of such polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5236—Macromolecular coatings characterised by the use of natural gums, of proteins, e.g. gelatins, or of macromolecular carbohydrates, e.g. cellulose
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5245—Macromolecular coatings characterised by the use of polymers containing cationic or anionic groups, e.g. mordants
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds

Definitions

  • the invention relates to new coating slips for ink-jet recording materials.
  • the invention further relates to the use of coating slips and ink-jet recording materials which are coated with these coating slips.
  • the recording material For use in ink jet printing, the recording material must be able to absorb the water as quickly as possible so that the image cannot be blurred. At the same time, however, the dye has to be fixed in a contour-clean manner at the point of impact of the ink jet and prevented from penetrating too deeply into the recording material. Otherwise, part of the ink can also be seen on the back of the recording material, which is called “strikethrough”.
  • the dye must not migrate out of the point of impact in the plane of the paper, either due to capillary forces between the paper fibers or through the interior of the fiber ("wicking"), and it must not migrate into neighboring dye areas ("bleeding"). In order to give the paper surface the desired properties, it needs to be finished.
  • Coating compositions essentially consist of a mostly white pigment, a polymeric binder and additives which influence the rheological properties of the coating color and the properties of the surface of the coated recording material in the desired sense. Such additives are often referred to as "cobinders". The binder fixes the pigments on the recording material and ensures cohesion in the coating obtained.
  • Coating with paper coating slips gives base papers a smooth, uniform white surface.
  • the coating slips also improve the printability of the recording material.
  • the coating slips for ink-jet recording materials contain a pigment which is highly absorbent for aqueous solutions and is anchored in itself and on the recording material with one or more hydrophilic binders.
  • the coating slip also contains a cationic polymer which coagulates the predominantly anionic dyes in the ink jet inks and thus fixes them on the point of impact and prevents them from flowing away.
  • the pigment best suited for the required task is highly disperse silica.
  • Other pigments, such as Kaolin are used (see e.g. M. Londo, On-Machine Coating of InkJet Paper Possible with Modified Kaolin, Pulp & Paper, May 2000, 37 - 43).
  • the best binder for coatings with silica for ink-jet recording materials is polyvinyl alcohol, despite the rheological difficulties associated with its use. It is therefore still used in most coating slips, possibly alongside other binders and additives, which, among other things, are intended to improve the rheological behavior.
  • polyvinylpyrrolidone is additionally added to the coating slip in order to improve the flow behavior of the coating slip, one Allow higher solids content and prevent wicking.
  • a typical coating slip for high-quality coated ink-jet recording material generally consists of water (solvent), disperse silica (pigment), polyvinyl alcohol (binder), polyvinyl pyrrolidone (leveling agent) and a cationic water-soluble polymer (fixing additive) ( see G. Morea-Swift, H. Jones, page 328, loc. cit.).
  • coating slips which contain copolymers of a main monomer and N-vinylcarboxamide as a binder.
  • these coating slips are not suitable for the production of high-quality ink-jet papers.
  • German application with the file number 100 55 592.6 describes paper coating slips which contain, as additives, polymers or copolymers of N-vinylformamide in order to activate optical brighteners. Ink-jet papers are not mentioned, however.
  • This invention was based on the object of providing coating slips for inkjet recording materials with improved properties or coating slips which lead to an improvement in the coated inkjet recording material.
  • ink-jet papers Recording materials that are to be printed with ink-jet processes are referred to here as ink-jet papers.
  • such cationic polymers or copolymers can be used in coating slips for ink-jet papers which consist of N-vinylformamide which is at least partially split, as well as those which, in addition to N -Vinylformamid, in the cleaved or uncleaved form, further contain copolymerized monomers.
  • Cationic copolymers of N-vinylformamide can be obtained particularly easily by hydrolytically cleaving homopolymers of N-vinylformamide with defined amounts of acid or base to the desired degree of hydrolysis, as described in EP-A 71 050.
  • the resulting amino groups on the polymer chain are more or less protonated depending on the pH of the solution and thus give the polymer a cationic character.
  • Cationic copolymers which contain N-vinylformamide in copolymerized form can also be used according to the invention.
  • cationic copolymers from N-vinylformamide and a water-soluble basic monomer, such as, for example, N-trialkylammonium alkyl acrylamides, at least partially protonated N-dialkyl ammonium alkyl acrylamides, N-trialkyl ammonium alkyl methacrylamides, at least partially protonated N-dialkyl ammonium alkyl methacrylamides, N-trialkyl acrylyl protonated N-dialkylammonium alkyl acrylates, N-trialkylammonium alkyl methacrylic esters, at least partially protonated N-dialkyl ammonium alkyl methacrylic esters and / or diallyldialkyl ammonium salts, and their use as flocculation and drainage aids for the treatment of wastewater and sludge corresponds to 04 52 25 088).
  • N-trialkylammonium alkyl acrylamides at least partially protonated N-
  • diallyldimethylammonium chloride diallyldiethylammonium chloride, Diallyldimethyla moniummethosulfat, sulfate Diallyldiethylammoniumetho-, N- (2-trimethylammonium) ethyl acrylamide methosulfate or N-2- (ethyl-dimethyl) ammoniumethylmethacrylamid ethosulfate, or mixtures thereof copolymerized with N-vinyl formamide, as in EP-Bl 464 043 and thus obtains cationic copoly merisates which are suitable for use in the coating colors according to the invention.
  • the (co) polymer generally contains the following monomers in copolymerized form:
  • 0-20% by weight preferably 0.5-10% by weight, particularly preferably 1-5% by weight and very particularly preferably 1-5% by weight.
  • Ethylene-unsaturated monomers known per se to the person skilled in the art can be copolymerized as other monomers.
  • esters of (meth) acrylic acid with alcohols which have 1 to 20 C atoms e.g. (Meth) acrylic acid methyl ester, (meth) acrylic acid ethyl ester, (meth) acrylic acid butyl ester, (meth) acrylic acid 2-ethylhexyl ester, vinyl aromatic compounds, e.g. Styrene, divinylbenzene,, ⁇ -unsaturated nitriles, e.g. Acrylonitrile, methacrylonitrile, vinyl esters, e.g.
  • Vinyl acetate, vinyl propionate, halogenated ethylenically unsaturated compounds e.g. Vinyl chloride, vinylidene chloride, conjugated unsaturated compounds e.g. Butadiene, isoprene, chloroprene, monounsaturated compounds, e.g. Ethylene, propylene, 1-butene, 2-butene, isobutene, cyclic monounsaturated compounds, e.g.
  • N-vinyl-N-alkyl-carboxamides or N-vinyl-carboxamides such as.
  • B N-vinyl acetamide, N-vinyl-N-methylformamide and N-vinyl-N-methylacetamide, vinyl ethers, for example methyl vinyl ether, ethyl vinyl ether, n-propyl vinyl ether, isopropyl vinyl ether, n-butyl vinyl ether ether, seTc-butyl vinyl ether, isobutyl vinyl ether, tert-butyl vinyl ether, 4-hydroxybutyl vinyl ether, and mixtures thereof.
  • vinyl ethers for example methyl vinyl ether, ethyl vinyl ether, n-propyl vinyl ether, isopropyl vinyl ether, n-butyl vinyl ether ether, seTc-butyl vinyl ether, isobutyl vinyl ether, tert-butyl vinyl ether, 4-hydroxybut
  • the copolymerization of the other monomers is not absolutely necessary to achieve the inventive success, so that it can also be dispensed with.
  • a free-radical (co) polymerization in a solvent or diluent is a common, but not the only method for the preparation of the (co) polymers mentioned above.
  • the free radical (co) polymerization of such monomers takes place, for example, in aqueous solution in the presence of polymerization initiators which decompose into free radicals under polymerization conditions.
  • the (co) polymerization can be carried out in a wide range
  • Temperature range if necessary under reduced or also under increased pressure, generally at temperatures up to 100 ° C.
  • the pH of the reaction mixture is usually adjusted in the range of 4 to 10.
  • the (co) polymerization can also be carried out in another manner known per se to the person skilled in the art, e.g. as solution, precipitation, water-in-oil emulsion or reverse suspension polymerization. Solution polymerization is preferred.
  • radical polymerization initiators e.g. radical-disintegrating azo compounds, such as 2,2'-azobis (isobutyronitrile), 2,2'-azobis (2-amidinopropane) hydrochloride or 4,4'-azobis (4 '- cyanopentanoic acid) (co) polymerized.
  • radical-disintegrating azo compounds such as 2,2'-azobis (isobutyronitrile), 2,2'-azobis (2-amidinopropane) hydrochloride or 4,4'-azobis (4 '- cyanopentanoic acid) (co) polymerized.
  • the compounds mentioned are mostly used in the form of aqueous solutions, the lower concentration being determined by the amount of water acceptable in the (co) polymerization and the upper concentration being determined by the solubility of the compound in question in water.
  • the concentration is generally 0.1 to 30% by weight, preferably 0.5 to 20% by weight, particularly preferably 1.0 to 10% by weight, based on the solution.
  • the amount of initiators is generally 0.1 to
  • the (co) polymerization can be carried out in the presence of polymerization regulators such as hydroxylammonium salts, chlorinated hydrocarbons and thio compounds such as e.g. tert. -Butyl mercaptan, thioglycolic acid, ethyl acrylate, mercaptoethynol, mercaptopropyltrimethoxysilane, dodecyl mercaptan, tert-dodecyl mercaptan or alkali metal hypophosphites.
  • these regulators e.g. B. in amounts of 0 to 0.8 parts by weight, based on 100 parts by weight of the monomers to be (co) polymerized, by which the molecular weight of the resulting (co) polymer is reduced.
  • ionic and / or nonionic emulsifiers and / or protective colloids or stabilizers can be used as surface-active compounds.
  • the (co) polymerization gives (co) polymers of different molecular weights, which are described in EP-Bl 71 050 and below with the aid of the K values according to Fikentscher (measured in 0.5% by weight aqueous) Saline at 25 ° C) is characterized.
  • (Co) polymers with a high K value are preferably prepared by (co) polymerizing the N-vinylformamide in water.
  • (Co) polymers with a high K value and high molecular weights are also obtained, for example, by (co) polymerizing the monomers in the form of reverse suspension polymerization or by (co) polymerizing the monomers by the water-in-oil polymerization method.
  • saturated hydrocarbons for example hexane, heptane, cyclohexane, decalin or aromatic hydrocarbons such as benzene, toluene, xylene and cumene
  • the ratio of oil phase to aqueous phase in the reverse suspension polymerization is, for example, 10: 1 to 1:10.
  • (Co) polymer with a low K value, for example below 80 is obtained if the (co) polymerization is carried out in the presence of polymerization regulators or in a solvent which regulates the (co) polymerization, for example alcohols, such as methanol, Ethanol, n- or iso-propanol, or ketones, such as acetone, ethyl methyl ketone, diethyl ketone or iso-butyl methyl ketone.
  • polymerization regulators for example alcohols, such as methanol, Ethanol, n- or iso-propanol
  • ketones such as acetone, ethyl methyl ketone, diethyl ketone or iso-butyl methyl ketone.
  • K values with low molecular weights and correspondingly low K values are still obtained using the usual methods, i.e. Use of larger amounts of polymerization initiator or use of polymerization regulators or combinations of the measures mentioned.
  • the molecular weight of the (co) polymers which can be used according to the invention is not restricted, but it should not be too high so that the coating slip does not become too high in viscosity.
  • (Co) polymers with K values of 10 to 80 are preferred, with K values of 30 to 60 being particularly preferred.
  • the K values are measured according to Fikentscher in 0.5% by weight aqueous saline solution at 25 ° C.
  • vinylformamide-containing (co) polymers can be used in at least partially split form.
  • a degree of splitting of 1 to 30% is preferred, particularly preferably 2 to 20% and very particularly preferably 3 to 10%.
  • the type of cleavage of the formyl group is not restricted, it can take place, for example, in the presence of acid or base, cleavage is preferred in the presence of bases, such as, for example, sodium hydroxide, potassium hydroxide, alkaline earth metal hydroxides, ammonia or amine.
  • an acid such as hydrochloric acid, hydrobromic acid, phosphoric acid, sulfuric acid
  • the pH in the acidic hydrolysis is in the range from 2 to 0, preferably from 1 to 0.
  • the hydrolysis proceeds much faster than that of (co) polymers of other N-vinylcarboxamides, such as, for. B. of N-methyl-N-vinylformamide, and can therefore under gentler conditions, i.e. at lower temperatures and without a large excess of acids.
  • the hydrolysis of the formyl groups of the poly-N-vinylformamide can also be carried out in an alkaline medium, for example in the pH range from 11 to 14. This pH is preferably adjusted by adding sodium hydroxide solution or potassium hydroxide solution. However, it is also possible to use ammonia, amines and / or alkaline earth metal bases. For the alkaline hydrolysis, 0.05 to 1.5, preferably 0.4 to 1.0 equivalents of a base are used.
  • the formyl group can be split off, for example, in water.
  • the formyl group is split off at temperatures in the range from 20 to 200, preferably 40 to 180 ° C. and particularly preferably in the temperature range from 70 to 90 ° C.
  • the cleavage can also be carried out without acid or base at high temperatures, for example above 100 ° C, preferably 120 to 180 ° C, particularly preferably 140 to 160 ° C in the presence of a solvent, e.g. Water. This is preferably carried out under conditions above the critical point, for example with supercritical water.
  • a solvent e.g. Water
  • hydrolysis i.e. the formyl group is split off from the poly-N-vinylformamide in water in the presence of acids or bases, and formic acid or salts of formic acid are obtained as a by-product.
  • the solutions obtained can be used without further work-up, but the hydrolysis or solvolysis products can also be separated off.
  • the solutions obtained are treated, for example, with ion exchangers.
  • the residue separated from the hydrolysis products can then be incorporated into the coating slips.
  • the amount of cationic (co) polymer of N-vinylformamide which is added to the coating slip for ink-jet recording materials according to the invention is generally as follows:
  • Cationic (co) polymer 5-45 parts by weight, preferably 10-40, particularly preferably 15 to 35.
  • Possible binders which can be added are, for example, starch and starch derivatives or polymers or copolymers which contain acrylic acid, acrylic acid ester, acrylonitrile, styrene, butadiene, vinyl acetate and / or ethylene in copolymerized form, for example copolymers of acrylic ester and Styrene, acrylic ester, styrene and acrylonitrile, styrene and butadiene, styrene, butadiene and acrylonitrile, vinyl acetate and ethylene or vinyl acetate, and their dispersions.
  • cationic fixatives such as e.g. Polyethyleneimines can be added, but preferably no other cationic fixing agent than the cationic (co) polymer in which N-vinylformamide is present in copolymerized form is present.
  • the coating slips according to the invention can contain one or more commercially available optical brighteners.
  • the coating slips can also contain further constituents known to the person skilled in the art.
  • Flow aids wetting aids for the pigments, (cationic) dispersing aids, e.g. for improving the flow properties at higher solids contents, lubricants, e.g. Calcium stearate, defoamers, e.g. silicone-based, etc.
  • the pigments which can be used in the coating slips according to the invention are likewise not restricted.
  • satin white calcium carbonate in ground or precipitated form
  • barium sulfate in ground or precipitated form aluminosilicates
  • kaolin clay
  • calcined clay silicates, silica, chalk or coating clay or organic pigments, e.g. B. plastics in particle form
  • plastics in particle form can be used.
  • Highly porous silica or surface-enhanced alumosilicates are preferably used, particularly preferably silica as a gel or precipitate with an average particle size of 1 to 25 ⁇ m, preferably 2 to 20, particularly preferably 3 to 20 (measured by laser scattering) and / or a pore volume of 0.1 to 5 ml / g, preferably 0.2 to 4, particularly preferably 0.4 to 3 (measured by nitrogen absorption) and / or an average pore size of 1 to 200 n, preferably 5 to 100, particularly preferably 10 to 50 (measured by nitrogen absorption).
  • SEAS surface-enhanced alumosilicates
  • the coating compositions of the invention are processed completely analogously to the processing of coating colors according to the prior art, for example according to "The Essential Guide to Aqueous Coating of Paper and Board", TWR Dean (ed.), Published by the Paper Industry Technical Association ( PITA), 1997 or "Guide for the Use of BASF Products in Paper and Cardboard Coating", BASF Aktiengesellschaft, D-6700 Ludwigshafen, Federal Republic of Germany, B 376 d, 09.77.
  • the constituents are mixed in a known manner, the (co) polymer generally being used in the form of a dispersion, suspension or solution.
  • the water content in the coating slip is usually set to 25 to 75% by weight, based on the total coating slip (including water).
  • a thickener can be added.
  • conventional organic and inorganic thickeners such as hydroxyethyl cellulose or bentonite are suitable as thickeners.
  • the coating slips are mostly aqueous coating slips.
  • the water content can be adjusted depending on the desired viscosity or flow properties.
  • the coating slip can be applied to the recording materials to be coated, e.g. Papers or cardboard can be applied (cf. Ullmann's Encyclopedia of Technical Chemistry, 4th edition, vol. 17, pp. 603 ff).
  • the coating slips according to the invention are suitable for coating recording materials, in particular paper or cardboard, which are to be printed using an ink jet process.
  • the various binders and additives which are incorporated into a conventional coating slip in accordance with the prior art differ very clearly in their chemical composition and in their chemical and physical properties. Since the manufacturer of the coating slips generally obtains these chemical products from various suppliers, an important advantage of the coating slips according to the invention is that it is no longer necessary to incorporate three different chemicals with different properties into the coating slip, but only one supplier, one ordering process, one Incoming inspection, a storage container, a dosing system, etc., and in particular an operation is necessary. The use of the coating slips according to the invention thus significantly simplifies the production of high-quality ink-jet recording materials, for example papers.
  • the coating slips according to the invention are that when the cationic polyvinylformamides are used alone, the coating slips have a significantly lower viscosity with the same pigment content than when polyvinyl alcohol is used together with the cationic fixing agent and possibly other polymers. This makes them easier to process or higher solids contents can be set in the coating slip, which can also result in advantages in terms of the quality of the ink-jet recording material, but which in particular reduces the energy required for the evaporation of the water.
  • the viscosity (measured according to Brookfield RV, 20 rpm) of the coating slips according to the invention is less than 9000 mPas, preferably less than, at a solids content of 40% by weight
  • solids contents in the coating slip of at least 25% by weight, preferably at least 30% by weight, particularly preferably from 30 to 75% by weight and in particular between 35 and 60% by weight can be set ,
  • sodium hydroxide Cationic polyvinylformamide obtained from a polyvinylformamide with a K value of 50 according to Fikentscher by hydrolysis of 5% of the formamide groups.
  • compositions and properties of the coating slips compared with one another are set out in Table 1.
  • Viscosity (mPa • s)
  • the conventional comparative coating slip has a much higher viscosity than the coating slip according to the invention. Therefore, it had to be thinned to 35.5% solids when applied to the paper.
  • the coating slips were applied to a wood-free base paper with a basis weight of 70 g / m 2 to a coat weight of 10 g / m 2 and then satinized.
  • they were each printed on three different ink jet printers with a standardized test image (HP Acceptance Criteria pattern).
  • the use of multiple printers is necessary because the composition of the printing inks depends on the model of the printer.
  • the following printers were used: Hewlett Packard HP 550, Hewlett Packard HP 2000C and Canon 5000.
  • the color density of the printed image was determined on a solid surface using a Gretag D 182 densitometer from Gretag, 8105 Regensdorf, Switzerland. Show-through and bleed-through were measured using the same density on the color density of the print back.
  • the color density of the fields which are printed with black and with black color composed of three colors (cyan, magenta, yellow) is measured in relation to the white environment from both sides of the paper.
  • the bleeding is measured on the yellow field printed with a black pattern. Numerical values below 3000 are rated as good, between 3000 and 4500 as satisfactory and more than 4500 as bad.
  • the table shows that the inkjet paper which was produced using the coating slip according to the invention is significantly better in terms of bleeding and wicking than the paper coated with the comparison coating slip. There was no significant difference between the two coating slips with regard to penetration.

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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)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)
  • Paper (AREA)

Abstract

L'invention concerne des matières d'enduction pour l'enduction de matières d'impression par jet d'encre, qui contiennent des polymérisats ou des copolymérisats cationiques dans lesquels se trouve intégré par polymérisation, du N-vinylformamide.
PCT/EP2002/001559 2001-02-23 2002-02-14 Matieres d'enduction pour impression par jet d'encre WO2002068549A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002238552A AU2002238552A1 (en) 2001-02-23 2002-02-14 Coating slips for inkjet printing

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10108987 2001-02-23
DE10108987.2 2001-02-23

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WO2002068549A2 true WO2002068549A2 (fr) 2002-09-06
WO2002068549A3 WO2002068549A3 (fr) 2002-12-12

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US5225088A (en) 1989-03-18 1993-07-06 Basf Aktiengesellschaft Use of nonhydrolyzed copolymers containing n-vinylformamide units as flocculants and drainage aids
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