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WO2011144534A1 - Papier couché et son utilisation - Google Patents

Papier couché et son utilisation Download PDF

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Publication number
WO2011144534A1
WO2011144534A1 PCT/EP2011/057779 EP2011057779W WO2011144534A1 WO 2011144534 A1 WO2011144534 A1 WO 2011144534A1 EP 2011057779 W EP2011057779 W EP 2011057779W WO 2011144534 A1 WO2011144534 A1 WO 2011144534A1
Authority
WO
WIPO (PCT)
Prior art keywords
particles
smaller
dry weight
coated paper
parts
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.)
Ceased
Application number
PCT/EP2011/057779
Other languages
English (en)
Inventor
Wim Ballet
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.)
Sappi Netherlands Services BV
Original Assignee
Sappi Netherlands Services BV
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 Sappi Netherlands Services BV filed Critical Sappi Netherlands Services BV
Publication of WO2011144534A1 publication Critical patent/WO2011144534A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
    • G03G7/0013—Inorganic components thereof
    • 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
    • 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
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/385—Oxides, hydroxides or carbonates
    • 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
    • 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
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
    • G03G7/002—Organic components thereof
    • G03G7/0026—Organic components thereof being macromolecular
    • G03G7/004—Organic components thereof being macromolecular obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/0053—Intermediate layers for image-receiving members

Definitions

  • the present invention relates to the field of coated paper substrates suitable for digital printing using liquid toner as well as for laser printing (electro photographic printing) using dry toner.
  • Electrostatic imaging paper also known as dielectric paper, comprises a base paper carrying a dielectric coating.
  • an electrical charge pattern is applied to the dielectric coating, for example by means of an array of styli or other electrodes, and this charge pattern is then rendered visible to produce an image by the application of a toner material which is normally in the form of a dry powder or a non-aqueous dispersion.
  • the pattern is then fixed to form a permanent image, for example by heating and/or by removal of solvent.
  • Polymer film or other sheet material may be used as the base for dielectric coating, instead of paper.
  • the base paper or other sheet material is normally rendered conductive by means of a conductive agent, e.g. an antistatic agent, applied at the size press or size bath (in the case of paper) or by other coating means (in the case of paper and other sheet materials). Salts, most usually polymeric quaternary ammonium compounds, have generally been used as conductive agents.
  • WO-A-2010/001 1230 in particular to paragraphs 17 and 24 thereof, the content of which is specifically incorporated herein.
  • the present invention relates to a coated paper for dry toner printing as well as for digital printing, specifically comprising at least one top coating consisting of 100 parts in dry weight of a pigment part, 3-10 parts in dry weight or 3 - 12 parts in dry weight of a binder part, 0.3 - 5 parts in dry weight, preferably 0.5 - 5 parts in dry weight or 1-5 parts in dry weight, preferably 1-4 parts in dry weight, of an electroconductivity agent, 0-1 parts in dry weight of further additives (such as brighteners, colorants, defoamers etc).
  • the electroconductivity agent is chosen to be a salt of a metallic cation with a polymeric anion.
  • At least one pre-coating layer beneath the above-mentioned single top coating layer there is provided at least one pre-coating layer, and this pre-coating layer is essentially free from any electroconductivity agent.
  • the electroconductivity agent is present in the top coating layer in 0.5-3 parts in dry weight, preferably in 1-3 parts in dry weight, most preferably in 1.5-3 parts in dry weight.
  • the electroconductivity agent is present roughly in 1 or 2 parts in dry weight, so in a range between 0.5-2 or 1-2, an optimum in terms of cost efficiency, process stability and effects is found.
  • the electroconductivity agent is a salt of an alkaline metal or an alkaline earth metal with a polymeric anion.
  • the most preferred polymeric anion of the electroconductivity agent is a polystyrene sulphonate.
  • a polystyrene sulphonate is for example available commercially under the name Indunal ECR 774 L of Indulor Chemie AG.
  • the polymeric anion of the electroconductivity agent can be a modified polyacrylic acid.
  • a modified polyacrylic acid is for example available commercially under the name Indunal ECR 776 L of Indulor Chemie AG.
  • the coating formulation comprises a surfactant, preferably a non-ionic surfactant, in an effective amount.
  • a surfactant can for example be an ethoxylated or propoxylated lipophilic alcohol, wherein preferably the surfactant has an HLB value in the range of 5-15, preferably in the range of 8-14.
  • HLB values in the range of 5-15, preferably in the range of 8-14.
  • Particularly suitable are systems based on secondary alcohol ethoxylates, modified for example with 3- 8 moles of EO, preferably with an average 5 moles EO.
  • C6-C17 or C11-C15 secondary alcohol ethoxylates can be used.
  • Suitable are for example systems with the CAS number 68131-40-8, with the above-mentioned HLB values, for example systems as available under the trade name Tergitol from Dow Chemical.
  • Such surfactant systems show a particular advantageous synergistic effect if used in combination with the above- mentioned electroconductivity agent in the form of a salt of a metallic cation with a polymeric anion.
  • Such a surfactant can be used as a supplement, either in addition to or partially replacing the electroconductivity agent.
  • the surfactant is added in 0.2-2 parts in dry weight, with reference to the parts of the pigment fraction, preferably in a range of 0.3-1 parts.
  • Particularly advantageous results can be achieved when adding such a surfactant system to the top coating formulation of a gloss grade, but also for silk grades or matte grades improved properties can be observed if added to the top coating formulation.
  • the pigment part in the top coating or in an optionally present pre-coating below said top coating comprises or consists of calcium carbonate, preferably ground calcium carbonate.
  • the pigment part preferentially essentially consists of ground and/or precipitated calcium carbonate with a particle size distribution such that 50% of the particles are smaller than 1 ⁇ , preferably that 50% of the particles are smaller than 0.5 ⁇ .
  • clay or kaoline based pigments either supplementing or replacing the calcium carbonate pigments. Possible are e.g. systems such as Hydragloss 90 as concerns the clay.
  • the pigment part, preferably of the top coating essentially may consist of ground calcium carbonate with a particle size distribution such that 95% of the particles are smaller than 2 ⁇ .
  • the top coating is a combination of a first ground calcium carbonate with a particle size distribution such that 60% of the particles are smaller than 2 ⁇ with a second ground calcium carbonate with a particle size distribution such that 90% of the particles are smaller than 2 ⁇ and with a fine particular clay with a particle size distribution such that at least 95% of the particles are smaller than 2 ⁇ .
  • the proportions are chosen such that the first ground calcium carbonate is present in the range of 10-50 parts in dry weight, the second ground coating carbonate is present in the range of 50-70 parts in dry weight, and the clay is present in the range of 5-30 parts in dry weight, in each case supplementing to 100 parts in dry weight of the pigment fraction.
  • a pigment fraction which is a combination of ground calcium carbonate with a fine particular clay, in particular of ground calcium carbonate with a particle size distribution such that 60% of the particles are smaller than 2 ⁇ with a fine particular clay with a particle size distribution such that at least 95% of the particles are smaller than 2 ⁇ .
  • the proportions are chosen such that the ground calcium carbonate is present in the range of 40-60 parts in dry weight and the clay supplements to 100 parts in dry weight of the full pigment fraction.
  • the coated paper has a surface resistivity of less than 15000 Ohm x 10 A 6 or 5000 Ohm x 10 ⁇ 6, preferably of less than 3000 Ohm x 10 A 6.
  • the surface resistivity should nevertheless preferably be above zero, preferably it is larger than 500 Ohm x 10 ⁇ 6.
  • the coated paper has a volume resistivity in the z-direction of less than 1500 or 1000 Ohm x 10 A 6, preferably of less than 500 Ohm x 10 A 6.
  • the volume resistivity should nevertheless be above zero, in other words in order to be suitable for both types of printing processes, preferably the coated paper has a volume resistivity in the z-direction of more than 50 Ohm x 10 A 6, preferably of more than 100 Ohm x 10 A 6.
  • this pre-coating layer is preferably essentially free from electroconductivity agents.
  • this pre- coating layer essentially consists of 100 parts in dry weight of a pigment part, preferably essentially consisting of ground calcium carbonate pigment, wherein preferably the pigment part comprises at least one calcium carbonate pigment with a particle size distribution such that 60% of the particles are smaller than 2 ⁇ , and at least one further calcium carbonate pigment with a particle size distribution such that 90% of the particles are smaller than 2 ⁇ , 5-12 parts in dry weight, preferably 7-10 parts in dry weight of binder, 0-2 parts in dry weight of further additives.
  • the binder can be a latex binder and/or PVA. Possible are for example systems such as styrene butadiene copolymer latex binders.
  • the top coating layer has a surface weight in the range of 5-25 g/m 2, preferably in the range of 10-15 g/m 2 . If below said top coating there is a pre-coating layer, this pre- coating layer has a surface weight in the range of 5-25 g/m 2 , preferably in the range of 10- 15 g/m 2 .
  • the total grammage of the coated papers can be in the range of 80 - 300 g/m , however also other grammages are possible.
  • the proposed coated paper has a top coating layer, and optionally below said top coating layer one or several pre-coating layers on both sides, and wherein the total surface weight of the coating layer(s) on each side is in the range of 20-35 g/m 2 , preferably in the range of 20-30 g/m 2 .
  • the present invention relates to the use of a coated paper according to any of the preceding claims in a dry toner laser printing process and/or in a liquid toner based digital offset printing process such as a digital offset printing process, preferably in an Indigo digital press printing process.
  • the Indigo digital press printing process technology is based on the liquid HP Electrolnk, which uses small colour particles suspended in Imaging Oil (Isopar) that can be attracted to the PIP (photo imaging plate) by means of a voltage differential.
  • the ink forms a very thin and smooth plastic layer on the heated blanket where it is transferred from the PIP.
  • the molten ink film is transferred from the blanket to the paper substrate.
  • the Indigo digital press printing process printing engine normally performs the following operations in the following order: I. Electrostatic charging of the electro photographic PIP which is mounted on an imaging cylinder; II. Exposure of the PIP by a scanned array of laser diodes; these lasers are controlled by a raster image processor, which converts instructions from a file into ⁇ /off instructions for the lasers; III. Image development performed by the ink developer units; IV. Transfer of the inked image to the blanket cylinder; V. Removal of any residual ink and electrical charge from the PIP; VI. Heating of the inked image carried by the blanket; VII. Transfer of the heated inked image to the substrate held by the impression cylinder. These steps are repeated for every color in the image.
  • a first coated printable substrate was produced using the coating formulations as given in table 1 below in the two leftmost columns, and further coated printable substrates for silk and gloss grades are given as well in table 1 (four columns on the right side).
  • the coated printable substrate in all cases comprised a pre-coat layer on a raw fibrous substrate covered by a top coat layer forming the final surface printable coating layer.
  • a pigment part consisting of Hydrocarb 60 is possible. On both sides coatings were applied.
  • Table 1 Coating formulations, wherein the following definitions are applicable: SC: solids content; contents are given as parts in dry weight, all in relation to 100 parts in dry weight of the pigment part.
  • the formulations may comprise further additives in minor amounts (typically less than 1 part) e.g. for processing properties, pH adjustment etc. of the coating formulations.
  • Hydrocarb 60 is a fine particulate ground calcium carbonate pigment with a particle size distribution such that approximately 60% of the particles are smaller than 2 ⁇ and with a median particle diameter of approximately 1.5 ⁇ .
  • Hydrocarb 90 is a fine particulate ground calcium carbonate with a particle size distribution such that approximately 90% of the particles are smaller than 2 ⁇ and with a median particle size diameter of 0.75 ⁇ .
  • Hydrocarb 95 is a fine particulate ground calcium carbonate pigment with a particle size distribution such that 95% of the particles are smaller than 2 ⁇ and with a median particle size diameter of approximately 0.5 ⁇ .
  • Hydragloss 90 is an ultra-fine particle size, high brightness coating clay with a particle size distribution such that 96% - 100% of the particles are smaller than 2 ⁇ and with a median particle size diameter of approximately 0.2 ⁇ .
  • Binder The binder used is an aqueous, anionic carboxylated styrene butadiene copolymer dispersion, so it is a latex binder. Possible is for example the use of the product Litex as available from PolymerLatex, Werra (DE).
  • Mowiol 4-98 is a polyvinylalcohol (PVA) with a viscosity of 4.5 mPas and a degree of hydrolysis (saponification degree) of 98.4 mol-%.
  • PVA polyvinylalcohol
  • Indunal ECR 774 L is an aqueous solution of polysodium styrene sulphonate with a solids content in the range of 29-31 %, a viscosity of 200-600 mPas, a pH value in the range of 8-10 and is of anionic character. It is available from Indulor
  • Tergitol S5 (also Tergitol 15-S-5) is a nonionic surfactant based on a secondary alcohol ethoxylate, wherein the secondary alcohol is a CI 1 -15 secondary alcohol, typically ethoxylated with 5 EO units (CAS Number: 68131 -40-8). It has an HLB value of 10.5, is ethoxylated with 5 EO units. It is available from Dow Chemicals (US).
  • an uncoated raw base paper (110 g/m ) which was based on sulphite pulp (45-60%), sulphate pulp (0-20%) and broke (32-40%) was used.
  • the base substrate was surface sized in a film press application wherein approximately 2 g/m 2 native starch were applied per side.
  • the precoat was applied with a solids content of 68.5% and a viscosity of 920 mPas (Brookfield at 100 imp) at a pH of 8.5 with a blade onto this raw base paper.
  • the pre-coat was applied at a coat weight of 13 g/m 2 on each side.
  • the pre-coat layer was dried using conventional infrared drying techniques.
  • the top coat was applied with a solids content of 65.2 % and a viscosity of 1240 mPas (Brookfield at 100 rpm) at a pH of 8-10 with a blade onto the pre-coated paper.
  • the top coat was applied at a coat weight of 13 g/m on each side the top coat layer was dried using conventional infrared drying techniques.
  • the final moisture was in the range of 4.5-5.5%.
  • the final grammage (area weight) of the coated paper was in the range of 170 g/m 2 .
  • the resulting coated paper products showed a surface resistivity (100 V -15 seconds) of 2500 MOhm and a volume resistivity (100 V -15 seconds) of 56 MOhm.
  • the further paper properties are collected in table 2 given below.
  • the coated papers were subjected to a printing process using a liquid toner based digital printing process using an HP Indigo 5000 printer.
  • Table 2 For the printing property reference is made to table 2 below. It was observed that the toner adhesion after 5 minutes, 15 minutes, 1 hour and 24 hours was excellent under CMYK, CMY as well as under K conditions (in each case 100% black). Ink rub values were in the range of 1.1.
  • toner adhesion test papers printed are measured after 5 minutes, 15 minutes, 60 minutes and 24 hours after printing.
  • a piece of 3M drafting tape #230 is applied on the printed area with a roller of 1 kg and stripped off.
  • a ranking is set up for evaluating the tested area; 1 is very good (no ink is stripped off) - 6 is bad (a lot/all ink is stripped off).
  • the resistivities were measured using a Trek Model 152P-CR-1 (Trek Inc. New York).
  • Table 2 results of printing tests and paper properties of the paper according to table 1 two columns.
  • ink-paper adhesion appears to be good every time the combination of a surfactant, in this case specifically Tergitol, and a electroconductivity agent in the form of a salt of a metallic cation with a polymeric anion, in this case specifically Indunal, is used in the recipe.
  • the blanket compatibility is not negatively influenced by the usage of Tergitol.
  • Blanket compatibility is a measure of physical paper-blanket interaction. After 3000 equal prints with a fixed test pattern the quality of the blanket is tested by printing a full colour sheet. The degree in which this sheet shows print gloss differences in the areas of the previously printed test pattern is used as a measure for blanket compatibility. Good blanket compatibility means no gloss differences are seen on this full colour sheet.
  • a further general beneficial property which was observed for the papers according to the present invention was that the printing properties were much less dependent on the moisture content of the paper.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Paper (AREA)

Abstract

La présente invention porte sur un papier couché, qui est en même temps approprié pour une impression au laser à toner sec, ainsi que pour une impression numérique à toner liquide, en particulier pour une impression Indigo numérique. Le papier couché selon l'invention comprend au moins un revêtement supérieur comprenant 100 parties en poids sec d'une partie de pigment, 3 à 10 parties en poids sec d'une partie de liant, 0,3 à 5, de préférence 1 à 5 parties, en poids sec, d'un agent de conductivité électrique, 0 à 1 partie en poids sec d'autres additifs, l'agent de conductivité électrique étant un sel d'un cation métallique comportant un anion polymère.
PCT/EP2011/057779 2010-05-17 2011-05-13 Papier couché et son utilisation Ceased WO2011144534A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP10163008.5 2010-05-17
EP10163008 2010-05-17

Publications (1)

Publication Number Publication Date
WO2011144534A1 true WO2011144534A1 (fr) 2011-11-24

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Application Number Title Priority Date Filing Date
PCT/EP2011/057779 Ceased WO2011144534A1 (fr) 2010-05-17 2011-05-13 Papier couché et son utilisation

Country Status (1)

Country Link
WO (1) WO2011144534A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5614325A (en) * 1992-11-26 1997-03-25 Arjo Wiggins Papiers Couches S.A. Coated paper for machines having sheet and friction feed systems
US5948534A (en) * 1996-02-26 1999-09-07 Kodak Polychrome Graphics Llc Coated paper stocks for use in electrostatic imaging applications
EP1245730A1 (fr) * 2001-03-28 2002-10-02 Oji Paper Company Limited Feuille de papier couchée
EP1300512A1 (fr) * 2000-06-27 2003-04-09 Nippon Paper Industries Co., Ltd. Papier couche d'impression
US20070237910A1 (en) * 2006-04-07 2007-10-11 Xiaoqi Zhou Media sheet
WO2009127598A1 (fr) * 2008-04-15 2009-10-22 Sappi Netherlands Services B.V. Formulation de revêtement pour un papier offset et papier revêtu par celui-ci
WO2010011230A1 (fr) 2008-07-25 2010-01-28 Hewlett-Packard Development Company, L.P. Revêtement composite et substrat utilisés dans l’impression électrophotographique liquide et procédé associé

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5614325A (en) * 1992-11-26 1997-03-25 Arjo Wiggins Papiers Couches S.A. Coated paper for machines having sheet and friction feed systems
US5948534A (en) * 1996-02-26 1999-09-07 Kodak Polychrome Graphics Llc Coated paper stocks for use in electrostatic imaging applications
EP1300512A1 (fr) * 2000-06-27 2003-04-09 Nippon Paper Industries Co., Ltd. Papier couche d'impression
EP1245730A1 (fr) * 2001-03-28 2002-10-02 Oji Paper Company Limited Feuille de papier couchée
US20070237910A1 (en) * 2006-04-07 2007-10-11 Xiaoqi Zhou Media sheet
WO2009127598A1 (fr) * 2008-04-15 2009-10-22 Sappi Netherlands Services B.V. Formulation de revêtement pour un papier offset et papier revêtu par celui-ci
WO2010011230A1 (fr) 2008-07-25 2010-01-28 Hewlett-Packard Development Company, L.P. Revêtement composite et substrat utilisés dans l’impression électrophotographique liquide et procédé associé

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