EP1987195B1 - Papier de base et son procede de fabrication - Google Patents

Papier de base et son procede de fabrication Download PDF

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Publication number
EP1987195B1
EP1987195B1 EP07711648A EP07711648A EP1987195B1 EP 1987195 B1 EP1987195 B1 EP 1987195B1 EP 07711648 A EP07711648 A EP 07711648A EP 07711648 A EP07711648 A EP 07711648A EP 1987195 B1 EP1987195 B1 EP 1987195B1
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EP
European Patent Office
Prior art keywords
coating
microcellulose
paper
water
viscosity
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.)
Not-in-force
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EP07711648A
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German (de)
English (en)
Other versions
EP1987195A2 (fr
Inventor
Harald Schlosser
Marc Mohring
Armin Ungerer
Josef Weigl
Christian Weigl
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.)
J Rettenmaier and Soehne GmbH and Co KG
Original Assignee
J Rettenmaier and Soehne GmbH and Co KG
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Publication of EP1987195A2 publication Critical patent/EP1987195A2/fr
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Publication of EP1987195B1 publication Critical patent/EP1987195B1/fr
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Classifications

    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
    • D21H21/52—Additives of definite length or shape
    • 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
    • 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
    • D21H19/52—Cellulose; Derivatives thereof
    • 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
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/25—Cellulose

Definitions

  • the invention relates to the use of a water-insoluble microcellulose for coating color dispersions for coating printing substrates, in particular for paper and board.
  • coating colors must have a very good running behavior. Not only increasing web speeds but also higher solids contents and novel pigments with rheologically problematic particle morphology (for example PCC) and higher shape factor (for example talcum) make the running behavior extremely difficult and are a real challenge in recipe optimization.
  • PCC rheologically problematic particle morphology
  • shape factor for example talcum
  • the whiteness or brightness of the papers is a key technical parameter of the final product and more than ever a very powerful marketing tool.
  • optical brighteners are increasingly used today.
  • Brighteners are known to be bound to suitable carrier materials (carriers, such as PVA, CMC), but due to a possible increase in viscosity with possible solids content reduction can be used only to a limited extent. In practice, therefore, especially at high brightener quantities - no longer the optimal brightener / carrier ratio can be set, which leads to a poorer whitening effect and to a graying, poorer light fastness and increased bleeding.
  • carriers such as PVA, CMC
  • a microcellulose with a narrow particle distribution which is produced especially for coating colors, very good water retention values and simultaneously higher solids contents of the coating color are obtained even at high web speeds and high temperatures.
  • microcellulose particles result in a barrier layer or rapid immobilization of the coating color on the raw paper interface, which prevents the water from being washed away too quickly and also binders, cobinders and other additives.
  • At high brightener doses can be achieved by partial replacement of PVA by microcellulose without solids content reduction by optimizing the brightener carrier ratio better brightening effect, light fastness with excellent bleeding fastness.
  • the main function of the co-binders and thickeners is to impart to the coating the desired viscosity and water repellency, even at higher temperatures (on-line) and higher shear stresses, i.e., higher production speeds.
  • Casein from cow's milk
  • soy protein from seeds of the soybean plant
  • starch oxidatively or enzymatically degraded starches of different origin
  • HEC hydroxyethylcellulose
  • Both CMC and HEC are obtained by chemical derivatization of the cellulose.
  • Most natural products are supplied in powder or granular form. Often, these products must first be dissolved in separate preparatory steps and only then added to the coating color.
  • Starch, soy protein and casein were used as binders in the early stages of paper coating. These products were characterized by the fact that, in addition to their binding power for the pigments, they also had the necessary thickening effect and water retention. Because of these properties, protein and especially starch are still used today as co-binder in addition to the more modern synthetic binders.
  • Polyvinyl alcohol is prepared by polymerization of vinyl acetate followed by hydrolysis.
  • Acrylate copolymers are produced by polymerization of suitable monomers such as acrylic acid and methacrylic acid and their esters, acrylonitrile, vinyl acetate, etc.
  • the so-called "associative thickeners” are hydrophobically modified acrylate copolymers with some pronounced properties.
  • hydrocolloids To develop their thickening effect, the hydrocolloids must be present in dissolved form.
  • the coating color must also have an overall favorable rheology.
  • modern coating processes with high solids contents and web speeds require pronounced pseudoplasticity, that is, decreasing viscosity at higher shear rates.
  • optical brighteners In order to achieve the highest degrees of whiteness and brightness with a shift in color hue reliably and economically, optical brighteners have become indispensable today.
  • the whiteness-increasing effect of the mostly used derivatives of Diaminöstilbendisulfonklaren based on their ability to absorb light from the non-visible ultraviolet range of daylight (350nm) and at higher wavelengths (440 nm) to emit or fluoresce.
  • the whiteness is also increased by the shift in hue from yellow to bluish.
  • the brightness of the paper is also increased.
  • the lightening effect only occurs when the optical brightener is fixed on a suitable carrier material or carrier or can "wind up".
  • co-binders which, among other properties before attem, perform a "carrier” function are polyvinyl alcohol, carboxymethyl cellulose (CMC), polyethylene glycol (PEG), polyvinyl pyrrolidone (PVP) starch, casein, MF resins and styrene-acrylate copolymers.
  • CMC carboxymethyl cellulose
  • PEG polyethylene glycol
  • PVP polyvinyl pyrrolidone starch
  • casein casein
  • MF resins styrene-acrylate copolymers
  • optical brighteners There are some factors that can seriously affect the optical brighteners in their effect.
  • these water-soluble products can migrate into the raw paper with the water, where they can hardly be reached by the UV rays.
  • the molecules of the optical brightener can attach to each other and "quench" each other, that is to make ineffective. These brightener agglomerates can even shift the color locus to green (graying / greening).
  • EP 0 710 742 A2 is a coating ink for a print carrier by the ink-jet printing method, which is characterized essentially in that a three-layer silicate is modified by acid activation of an alkali or Erdalkalismektits or by incorporation of metal oxide bridges in its layered structure and about 10 -. Parts, preferably 20 to 25 parts by weight of binder and other additives.
  • a coating ink for a printing substrate is known by the ink-jet printing method consisting essentially of a montmorillonite having a high swelling power and optionally containing a high-surface-area pigment such as synthetic silicic acid or calcium carbonate and a water-insoluble binder.
  • the high microcapillarity or specific surface area of the pigment particles results in excellent inkjet printability in the case of color printouts with good color brilliance, optical density of the colors and dot sharpness.
  • These papers are also characterized by a fast color drying and higher water resistance.
  • the acid anionic, water-soluble inks are anchored by inkjet preferably at cationic interfaces by rapid adsorption.
  • the high capillarity of the pigments facilitates the separation of dyes and liquid by chromatographic effect.
  • the larger dye molecules remain on the pigment surface, while smaller molecules, especially water and additives, are drawn into the interior of the pigments by the capillary forces.
  • This requires a high microcapillarity with a defined pore radius and / or improved water resistance. Due to their high specific surface area of the very expensive silicates used today, their binder requirement is very high (up to 30 - 40 parts binder). In turn, binders are also expensive and, in turn, occupy a large portion of the surface, thus reducing the active surface area.
  • a coating dispersion for coating paper and board contains a microcellulose with a narrow particle distribution and an average particle diameter (d 50%) of approx. And a weakly anionic interfacial charge (zeta potentials of -17 to -20 mV) specially developed for the coating process.
  • microcellulose In addition to the high intrinsic water retention of the microcellulose, the water-affluent microcellulose particles result in a barrier layer or rapid immobilization of the coating color on the base paper interface, which prevents the water from being washed away too quickly and also binders and other additives. Like all hydrocolloids, microcellulose binds significant amounts of water molecules to their interface, increasing their diameter and volume and occupying more space in the aqueous phase of the coating.
  • the investigations show that both the viscosity at low shear rates and at higher shear rates (high shear) with microcellulose decreases compared to starch and CMC in the coating color.
  • the investigations also show a lower dynamic viscosity than in formulations with starch and CMC.
  • the oscillatory measurement makes it possible to distinguish between elastic and plastic flow behavior.
  • the stress on the coating color is increased by the above-mentioned increase of the deflection amplitude. As a result, the particles are moved against each other.
  • a fully elastic system shows a shift angle of 0 °; a fully plastic system with a phase shift of 90 °.
  • G ' Low values of G 'correspond to high mobility with significantly reduced forces between the particles.
  • the low storage modulus G ' corresponds to previous experience, that is to say a rapid immobilization and barrier action of the water-insoluble microcellulose at the paper and cardboard interface prevents the coating ink from sagging due to steric hindrance as well as increased penetration of binders and other additives.
  • the remaining coating color over the barrier layer remains mobile, d. H. it is easy to level.
  • microcellulose has a positive effect on the process described by the action mechanism described, even in the case of extremely short effects of pressure pulses.
  • starch products are preferably used for surface sizing. With additional additives, certain effects are sought.
  • the film-forming effect of the starch can be effectively improved by reducing the penetration depth or a saving of the strength can be achieved.
  • the microcellulose Compared to CMC, which has hitherto been used as a regulator for the penetration depth of starch size press formulations, the microcellulose exhibits good water retention even at relatively high temperatures and, in addition, causes a barrier at the paper interface due to steric hindrance of the water-insoluble particles, which leads to increased penetration of the starch into the base paper prevents or controls accordingly.
  • microcellulose has a very high substantivity for optical brightener (carrier effect), very good water resistance and an improvement in abrasion resistance (abrasion resistance).
  • PVA is one of the most widely used carriers in the paper industry because of its excellent carrier effect for optical brighteners, used alone or in combination with CMC.
  • an optimal ratio between whitener and carrier material (carrier) is a prerequisite for the efficient use of optical brighteners. Due to the increasing trend towards higher paper whiteness levels, more and more added amounts of optical brighteners are associated with high carrier application rates, which leads to very high viscosity increases in the coating color. This is currently counteracted by dilution with water (solids content reduction) or often too small amounts of carrier added in relation to the optical brightener to avoid the viscosity increases, but this leads to insufficient utilization of the brightener potential, lack of light fastness and bleeding fastness.
  • microcellulose is not a completely equivalent substitute for PVA, very high carrier amounts and brightener amounts without Viskosefiöhung or dilution of the coating color by the combined use of PVA and microcellulose with the advantages of high lightfastness, a high brightening effect and above all a high bleed fastness can be implemented because the water-insoluble microcellulose for steric reasons, the penetration and migration processes that lead to bleeding can not join.
  • the free optical brighteners which are not bound to a carrier achieve the worst light fastnesses.
  • the CMC is replaced by microcellulose in a combination of PVA and CMC carriers, the brightener effect is improved due to the lower penetration of the brightener into the base paper (barrier effect, higher solids content).
  • coated digital printing papers for example color laser printing papers
  • microcellulose a significant improvement in toner adhesion was observed with appropriate calendering conditions.
  • microcellulose achieves a more open line structure or a faster and more uniform ink strike away from CMC or starch.
  • the more uniform and lower binder migration to the coating surface results in a smoother printed image or less mottling.
  • gravure printing no impairment of printability was observed, while starch and CMC in the form of missing dots had a negative effect.
  • the invention further provides a process for the preparation of a cationic microcellulose dispersion which is preferably used for specialty papers, such as inkjet papers.
  • the process of cationization is carried out by initially introducing the anionic microcellulose in an aqueous medium and adding one or more cationic additives to this medium while stirring, depending on the desired charge density.
  • a zeta potential of + 5 mV to + 90 mV results.
  • the cationic or cationized water-soluble polymers are generally characterized by containing quaternary nitrogen atoms in the main chain and / or in the side chains.
  • polymeric diallyl compounds examples include polymeric diallyl compounds, melamine-formaldehyde resins, epichlorohydrin resins, dicyandiamide resins, quaternary acrylates and inorganic polymers such as Polyaluminum hydroxychloride (PAC), cationically modified polyacrylamides (PAA), polyamidoamines (PAAM), polyamines (PA) and polyethylenimine (PEI).
  • PAC Polyaluminum hydroxychloride
  • PAA cationically modified polyacrylamides
  • PAAM polyamidoamines
  • PA polyamines
  • PEI polyethylenimine
  • poly-DADMAC poly (diallyldimethylammonium chloride)
  • poly-DADMAC which preferably has a molecular weight of 60.00 to 120,000, has proved to be particularly suitable.
  • the cationic microcellulose thus prepared may be applied to the base paper in the present form or may be applied in admixture with various pigments without binder addition such as, for example, kaolin, GCC, PCC, precipitated silicates, bentonites or other pigments.
  • various pigments such as, for example, kaolin, GCC, PCC, precipitated silicates, bentonites or other pigments.
  • cationic formulations up to 100 parts of the cationic microcellulose can be used.
  • the active ingredient content can be set individually according to customer requirements and is 10% dry matter in the application examples.
  • the coating pigments used are commercial pigments and mixtures thereof, such as, for example, kaolin, ground calcium carbonate (GCC), precipitated calcium carbonate (PCC), talc, precipitated silicates, titanium dioxide and aluminum hydroxides.
  • GCC ground calcium carbonate
  • PCC precipitated calcium carbonate
  • talc precipitated silicates
  • titanium dioxide and aluminum hydroxides Both the basic binder and the Spezialbirider are polymer dispersions (manufacturers for example BASF AG or Dow Chemical), which are found on the market with a wide variety of product properties. Combinations and copolymers are found which have been prepared with very different starting materials (monomers) (for example butadiene styrene, acrylic acid ester styrene, acrylic acid ester vinyl acetate, etc.). As Cobinder the products described in the patent can be used.
  • Suitable optical brighteners are derivatives of diaminostilbenesulfonic acids, which are preferably used in the paper industry. There are both disulfo-, tetrasutfo- or Hexasulfoaufheller used (manufacturer Clariant AG, Bayer or Ciba Geigy). As crosslinkers are preferably modified glyoxal products, epoxy resins, urea and melamine-formaldehyde resins and zirconium derivatives used.
  • the classical leveling agents (lubricants) are predominantly dispersions of calcium stearates, ammonium stearates, wax emulsions and PEG.
  • the base paper is wood-free, wood-containing and up to 100% recycled paper containing base paper or paperboard.
  • the print carrier has a basis weight between 30 g / m 2 otro and 350 g / m 2 otro.
  • the application of the coating color dispersion takes place according to the present invention within (online) and / or outside (offline) the paper machine.
  • applicators known from the prior art applicators are used, which, for example. Film presses, curtain coater, spray coating, roller coating, bar coating, blade coater, speed coater, Massey process, flooded nip, and the like.
  • the coating speed of the coating color dispersion takes place at a speed between 150 m / min and 2000 m / min.
  • coated papers lend themselves to a variety of printing processes as known in the art. These may be, for example, the offset printing method, the gravure printing method, inkjet method, flexographic printing method, heat set method, cold set method, laser printing method and the like. Another aspect of the invention is that the coated paper according to the invention has an excellent recycling behavior.
  • a high performance disperser was used to prepare the coating. Binder (BASF), cobinder, microcellulose and other additives were added successively to the GCC slurry (Omya) with stirring, the pH was adjusted with NaOH, and the viscosity was adjusted with residual water.
  • the microcellulose products are described in the company publication J. Rettenmaier u. Sons, Rosenberg described in detail.
  • V1 V2 V3 V4 V5 V6 V7 Pigment CaCO 3 (GCC) 100 100 100 100 100 100 100 100 100 Binder / co-binder Additive synth. binder 9.5 9.5 9.5 9.5 9.5 9.5 PVA (4-98) 0.6 0.6 - 1.0 1.0 - 1.0 CMC 0.45 - - 0.45 - 0.45 - Strength 2 1.5 0.8 2 1.5 2.0 0.8 nitrocellulose - 0.45 0.75 - 0.45 0.75 0.75 stearate 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 optical brightener 0.3 0.3 0.3 0.6 0.6 0.6 0.6 Solids content (%) 68.6 70.2 72.1 67.2 68.8 69.1 69.5 pH 8.8 8.6 8.7 8.8 8.7 8.7 8.8 Viscosity (mPas) 1240 1120 1180 1220 1140 1220 1130 Brookf.
  • the base paper used was a 46 g / m2 wood-containing base paper.
  • the coating is 12 g / m 2 .
  • the smoothness of Bekk sec. was in accordance with DIN 53107.
  • the assessment of the printability was carried out with the test printing device Fa. strigbau (multi-purpose trial printing device).
  • V1 V2 V3 V4 V5 Pigment calcium carbonate 70 70 70 70 70 (GCC) coating kaolin 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 Binder / co-binders additives: (Styrene-acylate) 10 10 9 10 9.5 PVA (4-98) 2.0 2.0 2.0 2.0 1.5 Ca stearate 0.15 0.15 0.15 0.15 0.15 0.15 CMC 0.4 - - - - Strength - - - 3.0 1.0 optical brightener 0.6 0.6 0.6 0.6 0.6.
  • the binder savings which can be up to more than 2 parts binder depending on the formulation and solids content increase, is made possible by the lower penetration of the binder by the higher solids content and by the barrier action of the microcellulose at the paper's interface.
  • Example 2 To prepare the coating colors and the rheological properties, application by hand wringer and calendering the methods mentioned in Example 1 were used. At the same time measurements were carried out with the Haake viscometer in the higher shear range.
  • the rotational viscometer with a coaxial cylinder system enables measurements in the defined shear gap. By choosing the speed of the rotating body and the dimensions of the shear gap can be the shear rate in the wide range up. Max. 4 10 4 s -1 vary.
  • the coat application weight is 10 g / m 2 .
  • V1 V2 V3 V4 Pigment coating kaolin 70 70 70 70 (high aspect ratio) Calcium carbonate (GCC) 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 Binder / co-binders additives Synthetic binders 4.5 4.5 4.5 4.5 4.5 PVA - - 0.8 0.5 nitrocellulose - 0.2 - 0.3 Synthetic thickener 0.5 0.3 0.35 0.2 Ca stearate 0.8 0.8 0.8 0.8 optical brightener - - 0.5 0.5 Solids content% 57.5 58.8 56.2 57.8 Brookfield viscosity 100 rpm (mPas) 950 890 1050 1020 Whiteness R 457 with UV 76.1 75.9 82.6 82.0
  • the Haake viscosity of the individual formulations correlates with the Brookfield viscosity, with the formulations with the microcellulose tending to be slightly lower.
  • Cationic microcellulose Due to the high cationic interfacial charge (zeta potential) and microcapillarity of the microcellulose, the anionic, water-soluble ink ink inks are anchored to the surface by rapid adsorption. In addition, the capillarity of the microcellulose promotes the separation of dyes and liquid by the chromatographic effect. Cationic microcellulose has an excellent water retention capacity, which has a correspondingly positive effect on the quality properties, especially of pigmented cationic streaks.
  • Example 2 For the preparation of the cationic coating colors and measurement of the rheological properties, application by doctor blade and calendering the methods mentioned in Example 1 were used. The charge measurement (zeta potential) was carried out with a zeta meter based on the principle of microelectrophoresis.
  • V1 V2 V3 V4 V5 Coating pigments coating kaolin - - 100 mod. CaCO3 - - - 100 100 Binder / co-binders additives Synth. Binder (cat.) - - - 18 18 nitrocellulose 85 70 35 - 2 cationic agents 15 30 15 9 9 crosslinkers 0.2 0.2 0.2 0.5 0.5 Coating color properties Solids content (%) 10.5 10.0 15.6 26.0 27.2 Viscosity Brookf. 940 640 620 540 450 (MPas) Zeta potential (MV) +64 +90 +93 +82 +85 PH value 7.3 8.2 5.9 8.6 8.7
  • microcellulose cationic coating colors provide excellent inkjet printability in both HP CP 1160, HP 895 Cxi, HP 950, Epson C 80, and Canon J750 inkjet prints that are significantly superior to conventionally coated and surface sized papers on color brilliance, optical density of Distinguish colors, point sharpness, bleeding and mottling.
  • the coating colors are also characterized by rapid color drying (increase in smudge resistance) and higher water resistance. Due to the excellent water retention capacity of cationic microcellulose, even with pigmented, cationic coating colors with high inkjet quality characteristics with 1-2 parts of cationized microcellulose, further quality improvements can be achieved in all printers in terms of color brilliance, bleeding and mottling.
  • the application unit Jetflow F with Stiff Blade was used as the application unit.
  • Coating application weight 12 g / m 2 Coating application weight 12 g / m 2 .
  • attitude 1 2 3 Working speed - 300 m / min 500 m / min Roll temperature H1 / H2 - 90 ° C / 90 ° C 90 ° C / 90 ° C line force - 110 N / mm 300 N / mm nip - 3 11
  • the calendering according to setting 2 corresponded to the calendering conditions of an offset paper and the setting 3 to the calendering conditions of a rotogravure paper.
  • the non-calendered paper pattern (setting 1) was changed to V4, the setting 2 calendered paper samples to V4! as well as the calendered with the setting 3 Textilmusten marked V4II.
  • V1 V2 V3 V4 Pigment Calcium carbonate (GCC) 70 70 70 70 70 coating kaolin 30 30 30 30 30 30 30 30
  • Binder / co-binder additives Synth. Binder 1 12.0 12.0 - - (Styrene-acrylate) Synth. Binder 2 - - 9.0 9.0 (Styrofoam-acrylate) PVA 4-98 - - 2.5 2.5 CMC 0.4 0.4 - - optical brightener 0.5 0.5 0.5 0.5 0.5 0.5 0.5 NaCl - 2.0 - 2.0 nitrocellulose - - 0.5 0.5
  • microcellulose gives rise to advantages in terms of offset in terms of repelling the printing ink. Only with strong gravure inking (V4 II), which are not common in offset, it comes to repel the ink. Despite the stronger thickening effect or stronger Viscosity increase of PVA compared to the synthetic binders there are advantages with solid content development. It can also be deduced from the investigations that the combination PVA / microcellulose has a good degree of whiteness or a good carrier effect for optical brighteners.
  • the printing and processing experiments with the test papers V1-V4 were carried out with a digital printing line of Océ. It can come at 1000 pages per minute with double-sided printing at the offset formulation V1 because of the high static charge to running problems. In particular, the coated papers produced with microcellulose are characterized in terms of toner adhesion.

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Claims (8)

  1. Dispersion de peinture,
    1.1 la dispersion contient de la microcellulose ;
    1.2 la microcellulose présente un diamètre moyen de particules de 10 à 1000 nm et une charge superficielle anionique.
  2. Dispersion selon la revendication 1, caractérisée en ce que le diamètre moyen des particules se situe entre 10 et 500 nm.
  3. Dispersion selon la revendication 1, caractérisée en ce que le diamètre moyen des particules se situe entre 10 et 200 nm.
  4. Dispersion selon l'une des revendications 1 à 3, caractérisée en ce que les particules ont un potentiel zêta de -17 à 20 mV.
  5. Procédé de cationisation de la dispersion selon la revendication 1, caractérisé en ce que la microcellulose anionique se présente dans une substance aqueuse et cette substance est additionnée d'un ou plusieurs additifs cationiques en agitant.
  6. Procédé selon la revendication 5, caractérisé en ce que les particules ont un potentiel zêta de 5 à 90 mV.
  7. Procédé de cationisation de la dispersion selon la revendication 6, caractérisé en ce que les additifs cationiques sont des polymères hydrosolubles.
  8. Procédé de cationisation de la dispersion selon la revendication 7, caractérisé en ce que les polymères hydrosolubles contiennent des atomes d'azote quaternaires dans la chaîne principale et/ou dans les chaînes latérales.
EP07711648A 2006-02-23 2007-02-23 Papier de base et son procede de fabrication Not-in-force EP1987195B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006008982 2006-02-23
PCT/EP2007/001582 WO2007096180A2 (fr) 2006-02-23 2007-02-23 Papier de base et son procede de fabrication

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EP1987195A2 EP1987195A2 (fr) 2008-11-05
EP1987195B1 true EP1987195B1 (fr) 2011-12-21

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EP (1) EP1987195B1 (fr)
AT (1) ATE538246T1 (fr)
WO (1) WO2007096180A2 (fr)

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EP4105380A1 (fr) 2009-03-30 2022-12-21 FiberLean Technologies Limited Procédé de production de suspensions de cellulose nanofibrillaire
EP2805986B1 (fr) 2009-03-30 2017-11-08 FiberLean Technologies Limited Procédé pour la production de gels de cellulose nano-fibrillaire
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PL2386682T3 (pl) 2010-04-27 2014-08-29 Omya Int Ag Sposób wytwarzania materiałów strukturalnych z użyciem nanowłóknistych żeli celulozowych
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PL3362508T3 (pl) 2015-10-14 2019-10-31 Fiberlean Tech Ltd 3D-formowalny materiał arkuszowy
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EP1987195A2 (fr) 2008-11-05
WO2007096180A2 (fr) 2007-08-30
WO2007096180A3 (fr) 2008-01-03

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