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WO2007033953A2 - Composition de revetement destinee a la production de papier - Google Patents

Composition de revetement destinee a la production de papier Download PDF

Info

Publication number
WO2007033953A2
WO2007033953A2 PCT/EP2006/066474 EP2006066474W WO2007033953A2 WO 2007033953 A2 WO2007033953 A2 WO 2007033953A2 EP 2006066474 W EP2006066474 W EP 2006066474W WO 2007033953 A2 WO2007033953 A2 WO 2007033953A2
Authority
WO
WIPO (PCT)
Prior art keywords
coating composition
composition according
kaolin
barium sulfate
paper
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/EP2006/066474
Other languages
German (de)
English (en)
Other versions
WO2007033953A3 (fr
Inventor
Thomas Rentschler
Michael Stefan
Jochen Winkler
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.)
Venator Germany GmbH
Original Assignee
Sachtleben Chemie 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 Sachtleben Chemie GmbH filed Critical Sachtleben Chemie GmbH
Publication of WO2007033953A2 publication Critical patent/WO2007033953A2/fr
Publication of WO2007033953A3 publication Critical patent/WO2007033953A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the 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
    • 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
    • D21H21/14—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 function or properties in or on the paper
    • D21H21/18—Reinforcing agents
    • 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

Definitions

  • the invention relates to a coating composition for paper coatings, the preparation of this coating composition and their use.
  • European cartonboard production amounts to approximately 12 million tonnes annually with an average growth rate of 2.4%.
  • Customers are placing increasing demands on packaging materials as an advertising medium, which are geared to high whiteness, high line and print gloss, best printability and low odor.
  • Product improvements in cost competition are therefore the daily challenges for manufacturers of papers, board and cardboard.
  • the object of the invention is to provide a coating composition for paper coating slips which overcomes the disadvantages of the prior art.
  • the object of the invention is to provide a coating composition for paper coating inks, which enables a uniform, provided with sharp edges printed image.
  • the object is surprisingly achieved by the features of the main claim. Preferred embodiments can be found in the subclaims.
  • the object is surprisingly achieved by the coating composition according to the invention, which contains both barium sulfate and kaolin.
  • kaolin can be used according to the invention only a kaolin variety or kaolin types.
  • the kaolin preferably has a particle size of 0.4 to 3 ⁇ m.
  • the kaolin is used as a mixture of different kaolin types with different particle sizes.
  • the kaolin is used as a mixture of two kaolin types with different particle sizes.
  • the barium sulfate is preferably synthetic barium sulfate. However, it is also possible according to the invention to use barium sulfate of natural origin, in particular ground baryte.
  • the barium sulfate according to the invention preferably has a particle size of from 0.02 to 10 .mu.m, particularly preferably from 0.4 to 2 .mu.m, very particularly preferably from 0.4 to 1 .mu.m.
  • the coating composition contains 30 to 95, preferably 50 to 95, particularly preferably 70 to 95 wt .-% kaolin, 5 to 30, preferably 7 to 20, particularly preferably 8 to 12 wt .-% barium sulfate and 0 to 65, preferably 1 to 50, more preferably 1 to 5 wt .-% further pigments.
  • titanium dioxide rutile and / or anatase
  • zinc sulfide zinc oxide
  • calcium carbonate ground calcium carbonate (GCC) and / or precipitated calcium carbonate (PCC)
  • talc precipitated calcium carbonate
  • the coating composition is further provided with a binder polymer or a plurality of binder polymers selected from polyacrylate, polystyrene or copolymers such as styrene-acrylonitrile-butadiene or mixtures thereof of two or more of these polymers.
  • a binder polymer or a plurality of binder polymers selected from polyacrylate, polystyrene or copolymers such as styrene-acrylonitrile-butadiene or mixtures thereof of two or more of these polymers.
  • starch can be added to the coating composition.
  • the preparation of the coating composition according to the invention is carried out according to the prior art.
  • the coating composition according to the invention is preferably used for the production of a top coat for paper, board and cardboard, more preferably for the production of a top coat for paper, board and cardboard previously pre-painted at least once, preferably once or twice, preferably with calcium carbonate as pigment.
  • the precoat or precursors are made, for example, with 100 parts of caclium carbonate (GCC, for example Omyalith, Hydrocarb 90, use as a slurry), 10 parts of styrene-acrylate binder, and 3 parts of starch.
  • GCC caclium carbonate
  • the precoat or primer and the top coat are preferably applied according to the invention with about 8 to 9 g / m 2 .
  • the top coat according to the invention preferably consists of 90 parts of kaolin and 10 parts of barium sulfate. Calcium carbonate and barium sulfate can optionally be used as slurry.
  • the coating composition according to the invention is preferably used for producing a top coat for carton boxes as printed, promotional packaging.
  • the coating composition of the invention results in a paper coating having a particularly smooth surface and reduced capillarity. This improves the printability, which is reflected in the fact that the printed image is uniform and provided with sharper edges, but above all, has a significantly reduced cloud formation.
  • the following remarks and examples are intended to illustrate the invention without limiting it thereto.
  • Cardboards are pre-painted twice at 8 g / m 2 using only calcium carbonate (CaCO 3) as the pigment.
  • the topcoat applied with about 9 g / m 2 contains a mixture of 90% by weight of kaolin and 10% by weight of titanium dioxide (TiO 2 ) or the coating composition according to the invention with 90% by weight of kaolin and 10% by weight of Barium sulfate (BaSO 4 ) described above.
  • FIG. 1 (a) shows a scanning electron micrograph of the cross-sectional area of the board coated with the coating composition according to the invention.
  • Fig. 1 (b) shows the distribution of aluminum
  • Fig. 1 (c) that of silicon
  • Fig. 1 (d) that of calcium
  • Fig. 1 (e) that of barium
  • Fig. 1 (b) is shown for better comparability in both the first and second image lines. From Fig. 1 it can be seen that the element peaks of aluminum and silicon, which originate from kaolin, are locally exactly superimposed and are separated from the calcium distribution, which results from the CaCO 3 .
  • the spatial distribution of barium originating from BaSO 4 occurs at the level of calcium and silicon in the kaolin / BaS0 4 topcoat.
  • a barium distribution at the level of calcium, ie also in the pre-coat is also found with practically the same intensity. Overall, the intensities of barium are lower, as well as a much smaller amount of barium was used.
  • BaSO 4 also has to be partially diffused with the liquid into the precoat during coat application.
  • Table 2 Optical data of boxes with different top coat.
  • the subsequently performed test prints differ greatly in their printed image:
  • the cardboard containing TiO 2 has, compared to the cardboard provided with the coating composition according to the invention, a very restless print image with heavy cloud formation.
  • the coating surface is obliquely illuminated from different directions and the light / dark contrasts resulting from the surface topography are recorded with a camera.
  • the relative scar index is a measure of the uniformity of the coating surface.
  • the determined values which are listed in Table 3, show clear differences between the samples.
  • Cardboard provided by the use of the coating composition according to the invention has been able to produce on the board a much more uniform surface with a finer line structure.
  • the quality differences in terms of gloss, color level and optical uniformity (mottling) clearly identified in the two printed samples are the result of this different surface topography and fine structure of the coating.
  • FIG. 2 shows SEM images of the surface of cardboard with kaolin / Ti0 2 (Fig. 2 (a) and (c)) and kaolin / BaS0 4 (Fig. 2 (b) and (d)) in the top coat at different Magnification, wherein the images (a) and (b) or (c) and (d) each have the same magnification.
  • FIG. 3 shows SEM images of the surface of boxes with kaolin / Ti0 2 (FIGS. 3 (a) and (c)) and kaolin / BaS0 4 (FIGS. 3 (b) and (d)) in the top coat at different magnifications. wherein the images (a) and (b) or (c) and (d) each have the same magnification.
  • n-heptane behaves absolutely neutral to natural papers and its ingredients, so that the absorption or penetration of n-heptane characterizes the capillary system and its dynamics.
  • the results of dynamic penetration measurements on coated boxes with n-heptane are plotted in FIG. 4.
  • the increasing deviation over time between the two coated cartons can be clearly seen.
  • the level detected in the sample containing the coating composition of the present invention corresponds to reduced color drift occurring only after a certain time, due to a reduction in capillarity at the interface from the topcoat to the precoat. As a result, the color strikes more slowly into the precoat, so it is more concentrated and more evenly bound in the topcoat, resulting in higher color strength and less cloud formation.

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  • Paper (AREA)

Abstract

La présente invention concerne une composition de revêtement destinée à des peintures d'enduction de papier, la préparation de cette composition de revêtement, et son utilisation.
PCT/EP2006/066474 2005-09-19 2006-09-19 Composition de revetement destinee a la production de papier Ceased WO2007033953A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005044713 2005-09-19
DE102005044713.9 2005-09-19

Publications (2)

Publication Number Publication Date
WO2007033953A2 true WO2007033953A2 (fr) 2007-03-29
WO2007033953A3 WO2007033953A3 (fr) 2007-08-02

Family

ID=37889162

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/066474 Ceased WO2007033953A2 (fr) 2005-09-19 2006-09-19 Composition de revetement destinee a la production de papier

Country Status (1)

Country Link
WO (1) WO2007033953A2 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3567672A (en) * 1967-05-03 1971-03-02 Polymer Corp Coating composition and process comprising calcium sulfoaluminate pigment,a rubbery latex binder and a copolymer of styrene and maleic monomer
FI108283B (fi) * 1997-01-13 2001-12-31 M Real Oyj Menetelmä paperin ja kartongin päällystämiseksi
DE10005685A1 (de) * 2000-02-09 2001-08-23 Sachtleben Chemie Gmbh Bariumsulfat, Verfahren zu dessen Herstellung und dessen Verwendung

Also Published As

Publication number Publication date
WO2007033953A3 (fr) 2007-08-02

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