EP0705939A1 - Base paper for decorative coating - Google Patents

Base paper for decorative coating Download PDF

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Publication number
EP0705939A1
EP0705939A1 EP95115392A EP95115392A EP0705939A1 EP 0705939 A1 EP0705939 A1 EP 0705939A1 EP 95115392 A EP95115392 A EP 95115392A EP 95115392 A EP95115392 A EP 95115392A EP 0705939 A1 EP0705939 A1 EP 0705939A1
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EP
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Prior art keywords
paper
inorganic particles
base paper
anionic inorganic
filler
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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.)
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EP95115392A
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German (de)
French (fr)
Inventor
Michael Dr. Harms
Christa Dr. Schnieder
Wolf-Dieter Dr. Schröer
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Technocell Dekor GmbH and Co KG
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Technocell Dekor GmbH and Co KG
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Publication of EP0705939A1 publication Critical patent/EP0705939A1/en
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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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays

Definitions

  • the present invention relates to a base paper for decorative coating systems, in particular laminates, decorative films and prepregs.
  • Laminates are laminates that are created by pressing several impregnated, stacked papers and that generally have a melamine or polyester resin surface. This can consist of one or more layers and be anchored on different documents.
  • the classic laminate consists only of paper and resin, whereby the thickness-determining base consists of phenol-impregnated kraft paper.
  • the thickness-determining base consists of phenol-impregnated kraft paper.
  • wood materials for example, hardboard and chipboard as well as plywood are used.
  • Paper laminates generally consist of melamine-coated, transparent overlay paper, melamine-coated, colored and / or printed decorative paper, melamine-coated, opaque barrier paper and phenol-coated kraft paper.
  • Combined laminates usually consist of overlay paper, decorative paper, barrier paper or kraft paper and hardboard or chipboard.
  • Barrier papers are used as barrier layers between the phenolic paper and the decorative top layer to prevent the brown core layer from showing through and the penetration of phenolic resin into the decorative layer. They are made from highly bleached sulphate or sulphite pulps, which in addition to good wet strength and absorbency also require very good opacity.
  • the opacity that is so important for decor papers is achieved through high filler proportions.
  • White pigments such as zinc sulfide and titanium dioxide are suitable as fillers.
  • Other fillers such as calcium carbonate can also be used.
  • Zinc sulfide gives the paper excellent lightfastness (lightfastness). In addition to its relatively poor retention in the paper, there is also the risk of decomposition with elimination of hydrogen sulfide at the usual acidic pH ratios in the paper stock.
  • the rutile type of the various titanium dioxide pigments is particularly suitable.
  • the disadvantage is its high price. With TiO2 contents of up to 45% by weight in the decorative paper, it is therefore particularly important to ensure maximum retention of the pigment.
  • retention aids are added to the paper pulp.
  • retention agents include, for example, polyacrylamide (Khim. Pererabotka Drev. Ref. Inform. No. 12: 9-10, 1967) and polycarboxylic acids.
  • the known papers for laminated materials can still be improved with regard to the requirements placed on them. This also applies to the degree of whiteness, opacity and lightfastness.
  • the object of the present invention is to provide a base paper for decorative coating systems which has excellent properties, in particular with regard to opacity and light resistance.
  • corative coating systems is understood to mean both laminated materials such as decorative papers and barrier papers, and also decorative films and prepregs.
  • a base paper which is formed from a paper pulp which, in addition to at least one filler and a wet-strengthening cationic resin, contains anionic inorganic particles.
  • the anionic inorganic particles can in particular be selected from the group of colloidal silica, colloidal aluminum-modified silica or colloidal sodium- or aluminum-modified silicate.
  • the amount of anionic inorganic particles in the paper pulp can be up to 0.5% by weight.
  • the quantity range from 0.01 to 0.25% by weight is particularly preferred.
  • the quantities given relate to the pulp fiber content.
  • Suitable fillers are, for example, titanium dioxide, zinc sulfide, calcium carbonate, kaolin (china clay), talc or mixtures thereof.
  • a rutile titanium dioxide surface-treated with Al2O3 is used.
  • the amount of titanium dioxide in the paper pulp is between 1 to 55% by weight, but in particular 25 to 45% by weight.
  • Melamine-formaldehyde resins, polyamine or polyamide derivatives can be used as wet strength agents in amounts of 0.3 to 2% by weight.
  • the pulp may also contain other substances such as organic and inorganic colored pigments and dyes, optical brighteners and dispersants.
  • the base papers according to the invention are produced in a known manner using a paper machine in a grammage range from 50 to 200 g / m2.
  • the various components can be added to the pulp suspension in a different order and at different locations known to the paper manufacturer.
  • the anionic inorganic particles are fed to the so-called thin material before the headbox.
  • the retention was determined according to the "Britt" dynamic drainage year method (DDJ method) developed by Paper Research Materials, Inc. The test was carried out on untreated papers.
  • the laminate samples (4.5 x 10 cm) were exposed to radiation with a 1: 1 change from light to dark with the aid of a xenon high-pressure lamp (150,000 lux) for 96 hours.
  • a xenon high-pressure lamp (150,000 lux) for 96 hours.
  • the brightness L according to DIN 6174 was measured before and after the xenon text on the laminate samples. The larger the numerical value L, the higher the brightness.
  • the brightness was measured using the Elephro 2000 color measuring device (Data Color).

Abstract

Base paper (I) for decorative coating systems is made from a paper material contg. cellulose fibres, filler(s) and a cationic resin as wet strength improver, which also contains anionic inorganic particles (II). Also claimed is a process for the prodn. of (I) from the above components and opt. other additives, by adding (II) to the pulp suspension and converting this into paper.

Description

Die vorliegende Erfindung betrifft ein Basispapier für dekorative Beschichtungssysteme, insbesondere Schichtpreßstoffe, Dekorfolien und Vorimprägnate.The present invention relates to a base paper for decorative coating systems, in particular laminates, decorative films and prepregs.

Schichtpreßstoffe sind Laminate, die durch Verpressen mehrerer imprägnierter, aufeinander geschichteter Papiere entstehen und die im allgemeinen eine Melaminharz- oder Polyesterharzoberfläche aufweisen. Diese kann aus einer oder mehreren Schichten bestehen und auf verschiedenen Unterlagen verankert sein. Das klassische Laminat besteht nur aus Papier und Harz, wobei die dickenbestimmende Unterlage aus phenolgetränkten Kraftpapieren besteht. Es ist aber auch bekannt, verschiedene Holzmaterialien als Unterschichten Zu verwenden. Hierfür werden beispielsweise Hartfaser- und Holzspanplatten sowie Sperrholz eingesetzt.Laminates are laminates that are created by pressing several impregnated, stacked papers and that generally have a melamine or polyester resin surface. This can consist of one or more layers and be anchored on different documents. The classic laminate consists only of paper and resin, whereby the thickness-determining base consists of phenol-impregnated kraft paper. However, it is also known to use different wood materials as underlayers. For example, hardboard and chipboard as well as plywood are used.

Papierlaminate bestehen im allgemeinen aus melaminbeharztem, transparentem Overlay-Papier, melaminbeharztem, gefärbtem und/oder bedrucktem Dekorpapier, melaminbeharztem, opakem Barrierepapier und phenolbeharztem Kraftpapier.Paper laminates generally consist of melamine-coated, transparent overlay paper, melamine-coated, colored and / or printed decorative paper, melamine-coated, opaque barrier paper and phenol-coated kraft paper.

Kombinierte Laminate bestehen üblicherweise aus Overlay-Papier, Dekorpapier, Barrierepapier oder Kraftpapier und Hartfaser- oder Spanplatten.Combined laminates usually consist of overlay paper, decorative paper, barrier paper or kraft paper and hardboard or chipboard.

Barrierepapiere werden als Sperrschichten zwischen den Phenolpapieren und der Dekoroberschicht eingesetzt, um das Durchscheinen der braunen Kernschicht sowie das Durchdringen von Phenolharz in die Dekorschicht zu verhindern. Sie werden aus hochgebleichten Sulfat- oder Sulfitzellstoffen hergestellt, wobei neben guter Naßfestigkeit und Saugfestigkeit auch eine sehr gute Opazität verlangt wird.Barrier papers are used as barrier layers between the phenolic paper and the decorative top layer to prevent the brown core layer from showing through and the penetration of phenolic resin into the decorative layer. They are made from highly bleached sulphate or sulphite pulps, which in addition to good wet strength and absorbency also require very good opacity.

Übliche Dekorpapiere werden aus hochweißem Sulfatzellstoff höchster Reinheit hergestellt. Es werden an die Dekorpapiere eine ganze Reihe spezieller Anforderungen gestellt. Hierzu gehören:

  • hohe Opazität, um eine bessere Abdeckung der Unterlage zu gewährleisten,
  • gleichmäßige Formation und Grammatur zur Gewährleistung von gleichmäßiger Harzaufnahme,
  • hohe Reinheit und Gleichmäßigkeit der Farbe zur Gewährleistung einer guten Reproduzierbarkeit des später auf das Dekorpapier aufgedruckten Musters,
  • hohe Lichtbeständigkeit,
  • hohe Naßfestigkeit zur Gewährleistung eines reibungslosen Imprägniervorganges,
  • entsprechende Saugfähigkeit zur Erlangung des erforderlichen Harzsättigungsgrades.
Conventional decorative papers are made from ultra-high-purity white sulfate pulp. A whole series of special requirements are placed on the decorative papers. These include:
  • high opacity to ensure better coverage of the base,
  • uniform formation and grammage to ensure even resin absorption,
  • high purity and uniformity of color to ensure good reproducibility of the pattern later printed on the decorative paper,
  • high lightfastness,
  • high wet strength to ensure a smooth impregnation process,
  • appropriate absorbency to achieve the required degree of resin saturation.

Um alle oben erwähnten Anforderungen zu erfüllen, müssen bei der Herstellung dieser Papiere hochwertige Rohmaterialien, Füllstoffe und Hilfsstoffe eingesetzt sowie entsprechende Produktionsbedingungen eingehalten werden.In order to meet all of the requirements mentioned above, high-quality raw materials, fillers and auxiliary materials must be used in the manufacture of these papers, and corresponding production conditions must be observed.

Die für Dekorpapiere so wichtige Opazität wird durch hohe Füllstoffanteile erreicht. Als Füllstoffe eignen sich Weißpigmente wie Zinksulfid und Titandioxid. Aber auch andere Füllstoffe, wie Calciumcarbonat können eingesetzt werden. Zinksulfid verleiht dem Papier eine ausgezeichnete Lichtechtheit (Lichtbeständigkeit). Neben seiner relativ schlechten Retention im Papier besteht jedoch zusätzlich die Gefahr der Zersetzung unter Schwefelwasserstoffabspaltung bei den üblichen sauren pH-Verhältnissen im Papierstoff.The opacity that is so important for decor papers is achieved through high filler proportions. White pigments such as zinc sulfide and titanium dioxide are suitable as fillers. Other fillers such as calcium carbonate can also be used. Zinc sulfide gives the paper excellent lightfastness (lightfastness). In addition to its relatively poor retention in the paper, there is also the risk of decomposition with elimination of hydrogen sulfide at the usual acidic pH ratios in the paper stock.

Von den verschiedenen Titandioxidpigmenten eignet sich der Rutiltyp besonders gut. Der Nachteil dabei ist sein hoher Preis. Bei TiO₂-Gehalten bis zu 45 Gew.% im Dekorpapier ist es deswegen besonders wichtig, eine maximale Retention des Pigments zu gewährleisten.The rutile type of the various titanium dioxide pigments is particularly suitable. The disadvantage is its high price. With TiO₂ contents of up to 45% by weight in the decorative paper, it is therefore particularly important to ensure maximum retention of the pigment.

Um eine gute Retention der Füllstoffe zu erreichen, werden der Papiermasse verschiedene Retentionsmittel zugegeben. Zu solchen Retentionsmitteln gehören beispielsweise Polyacrylamid (Khim. Pererabotka Drev. Ref. Inform. no. 12: 9-10, 1967) und Polycarbonsäuren.In order to achieve good retention of the fillers, various retention aids are added to the paper pulp. Such retention agents include, for example, polyacrylamide (Khim. Pererabotka Drev. Ref. Inform. No. 12: 9-10, 1967) and polycarboxylic acids.

Die bekannten Papiere für Schichtpreßstoffe sind bezüglich der an sie gestellten Anforderungen immer noch verbesserungsfähig. Dies gilt auch für den Weißgrad Opazität und Lichtbeständigkeit.The known papers for laminated materials can still be improved with regard to the requirements placed on them. This also applies to the degree of whiteness, opacity and lightfastness.

Aufgabe der vorliegenden Erfindung ist es, ein Basispapier für dekorative Beschichtungssysteme zu schaffen, das hervorragende Eigenschaften, insbesondere im Hinblick auf Opazität und Lichtbeständigkeit, aufweist.The object of the present invention is to provide a base paper for decorative coating systems which has excellent properties, in particular with regard to opacity and light resistance.

Darüber hinaus ist es Aufgabe der Erfindung, ein Verfahren zur Herstellung eines Basispapiers für dekorative Beschichtungssysteme vorzuschlagen, nach dem die eingangs beschriebenen Eigenschaften verbessert und eine bessere Retention des Füllstoffs erreicht werden können.In addition, it is an object of the invention to propose a method for producing a base paper for decorative coating systems, according to which the properties described in the introduction can be improved and better retention of the filler can be achieved.

Unter dem Begriff "dekorative Beschichtungssysteme" werden im Rahmen der Erfindung sowohl Schichtpreßstoffe wie Dekorpapiere und Barrierepapiere als auch Dekorfolien und Vorimprägnate verstanden.In the context of the invention, the term “decorative coating systems” is understood to mean both laminated materials such as decorative papers and barrier papers, and also decorative films and prepregs.

Die Aufgabe wird durch ein Basispapier gelöst, das aus einer Papiermasse gebildet ist, die zusätzlich zu wenigstens einem Füllstoff und einem naßfest machenden kationischen Harz anionische anorganische Partikeln enthält.The object is achieved by a base paper which is formed from a paper pulp which, in addition to at least one filler and a wet-strengthening cationic resin, contains anionic inorganic particles.

Die anionischen anorganischen Partikeln können insbesondere aus der Gruppe der kolloidalen Kieselsäure, der kolloidalen aluminiummodifizierten Kieselsäure oder des kolloidalen natrium- oder aluminiummodifizierten Silikats ausgewählt werden.The anionic inorganic particles can in particular be selected from the group of colloidal silica, colloidal aluminum-modified silica or colloidal sodium- or aluminum-modified silicate.

Die Menge der anionischen anorganischen Partikeln in der Papiermasse kann in einer besonderen Ausgestaltung der Erfindung bis zu 0,5 Gew.% betragen. Besonders bevorzugt ist der Mengenbereich 0,01 bis 0,25 Gew.%. Die Mengenangaben beziehen sich auf den Zellstoffaseranteil.In a particular embodiment of the invention, the amount of anionic inorganic particles in the paper pulp can be up to 0.5% by weight. The quantity range from 0.01 to 0.25% by weight is particularly preferred. The quantities given relate to the pulp fiber content.

Als Füllstoff eignen sich beispielsweise Titandioxid, Zinksulfid, Calciumcarbonat, Kaolin (China-Clay), Talkum oder Mischungen daraus.Suitable fillers are, for example, titanium dioxide, zinc sulfide, calcium carbonate, kaolin (china clay), talc or mixtures thereof.

In einer bevorzugten Ausführungsform der Erfindung wird ein mit Al₂O₃ oberflächenbehandeltes Rutil-Titandioxid eingesetzt.In a preferred embodiment of the invention, a rutile titanium dioxide surface-treated with Al₂O₃ is used.

Die Menge des Titandioxids in der Papiermasse beträgt zwischen 1 bis 55 Gew.%, insbesondere aber 25 bis 45 Gew.%.The amount of titanium dioxide in the paper pulp is between 1 to 55% by weight, but in particular 25 to 45% by weight.

Als Naßfestmittel können Melamin-Formaldehyd-Harze, Polyamin- oder Polyamidderivate in Mengen von 0,3 bis 2 Gew.% eingesetzt werden.Melamine-formaldehyde resins, polyamine or polyamide derivatives can be used as wet strength agents in amounts of 0.3 to 2% by weight.

In der Papiermasse können zusätzlich auch noch andere Stoffe wie organische und anorganische Buntpigmente und Farbstoffe, optische Aufheller und Dispergiermittel enthalten sein.The pulp may also contain other substances such as organic and inorganic colored pigments and dyes, optical brighteners and dispersants.

Die erfindungsgemäßen Basispapiere werden in bekannter Weise mit Hilfe einer Papiermaschine in einem Grammaturbereich von 50 bis 200 g/m² hergestellt. Im Rahmen des erfindungsgemäßen Verfahrens können die verschiedenen Komponenten in unterschiedlicher Reihenfolge und an verschiedenen dem Papierhersteller bekannten Stellen der Zellstoffsuspension zugefügt werden. Im Hinblick auf die Erzielung optimaler Ergebnisse werden bei einer bevorzugten Ausführungsform der Erfindung die anionischen anorganischen Partikeln dem sogenannten Dünnstoff vor dem Stoffauflauf zugeführt.The base papers according to the invention are produced in a known manner using a paper machine in a grammage range from 50 to 200 g / m². In the context of the method according to the invention, the various components can be added to the pulp suspension in a different order and at different locations known to the paper manufacturer. With a view to achieving optimal results, in a preferred embodiment of the invention the anionic inorganic particles are fed to the so-called thin material before the headbox.

Die Erfindung wird in den nachfolgenden Beispielen näher erläutert.The invention is explained in more detail in the examples below.

Beispiel 1 und 2Examples 1 and 2

Eine Mischung aus 80 Gew.% Laubholz-Sulfatzellstoff und 20 Gew.% Nadelholz-Sulfatzellstoff wurde bei einer Stoffdichte von 4 % bis zu einem Mahlgrad von 38° SR gemahlen. Der Zellstoffsuspension wurden dann Stoffe entsprechend Tabelle 1 zugesetzt und daraus ein ca. 70 g/m² schweres Basispapier gefertigt.

Figure imgb0001
A mixture of 80% by weight of hardwood sulfate pulp and 20% by weight of softwood sulfate pulp was ground at a consistency of 4% to a freeness of 38 ° SR. Substances corresponding to Table 1 were then added to the pulp suspension and an approximately 70 g / m² base paper was made therefrom.
Figure imgb0001

Die Versuche wurden auch mit anderen Zellstoffsuspensionen durchgeführt. Der erfindungsgemäße Effekt wurde auch hier bestätigt.The tests were also carried out with other pulp suspensions. The effect according to the invention was also confirmed here.

Versuchsbeispiele V1 - V3Experimental examples V1 - V3

Einer Zellstoffsuspension wie in den Beispielen 1 und 2 wurden folgende Stoffe zugesetzt: Tabelle 2 Stoff Papiervariante, Gew.% *) V1 V2 V3 Titandioxid (Rutil) 62,0 62,0 62,0 Polyamid/Polyamin-Epichlorhydrin-Harz 1,05 1,05 1,05 anion. Polyacrylamid - 0,20 - Polycarbonsäure Na-Salz - - 0,20 Nuancierfarbstoff (Eisenoxid) 0,02 0,02 0,02 Daraus wurden 60 g/m² schwere Basispapiere gefertigt. *) Die Mengen beziehen sich auf den Zellstoff The following substances were added to a pulp suspension as in Examples 1 and 2: Table 2 material Paper variant,% by weight *) V1 V2 V3 Titanium dioxide (rutile) 62.0 62.0 62.0 Polyamide / polyamine epichlorohydrin resin 1.05 1.05 1.05 anion. Polyacrylamide - 0.20 - Polycarboxylic acid sodium salt - - 0.20 Shading dye (iron oxide) 0.02 0.02 0.02 60 g / m² base papers were made from it. *) The quantities refer to the pulp

Prüfung der gemäß den Beispielen und Vergleichsbeispielen hergestellten BasispapiereExamination of the base papers produced according to the examples and comparative examples

Von den gefertigten Papierproben wurde jeweils ein Teil unbehandelt belassen und geprüft, ein anderer Teil wurde in bekannter Weise mit Melamin-Formaldehyd-Harz imprägniert, zu entsprechenden Schichtstoff-Mustern verpreßt (1 Lage imprägniertes Basispapier, 4 Lagen Phenolpapier, 1 Lage Gegenzug, 140° C, 900 N/cm²) und untersucht.One part of the paper samples produced was left untreated and tested, another part was impregnated in a known manner with melamine-formaldehyde resin, pressed into corresponding laminate samples (1 layer of impregnated base paper, 4 layers of phenolic paper, 1 layer of counter pull, 140 ° C, 900 N / cm²) and examined.

Zur Bewertung wurden folgende Prüfverfahren herangezogen:The following test methods were used for the evaluation:

Retention (%)Retention (%)

Die Retention wurde nach der von der Fa. Paper Research Materials, Inc. entwickelten "Britt" Dynamic Drainage Jahr Methode (DDJ-Methode) ermittelt. Die Prüfung wurde an unbehandelten Papieren vorgenommen.The retention was determined according to the "Britt" dynamic drainage year method (DDJ method) developed by Paper Research Materials, Inc. The test was carried out on untreated papers.

LichtechtheitstestLight fastness test

Die Schichtstoffmuster (4,5 x 10 cm) wurden mit Hilfe eines Xenon-Hochdruckstrahlers (150 000 Lux) für die Dauer von 96 Stunden einer Bestrahlung mit einem Hell-Dunkelwechsel 1:1 ausgesetzt. Zur Begutachtung der Lichtechtheit wurde an den Schichtstoffmustern die Helligkeit L nach DIN 6174 vor und nach dem Xenon-Text gemessen. Je größer der Zahlenwert L ist, desto höher ist die Helligkeit.The laminate samples (4.5 x 10 cm) were exposed to radiation with a 1: 1 change from light to dark with the aid of a xenon high-pressure lamp (150,000 lux) for 96 hours. To assess the light fastness, the brightness L according to DIN 6174 was measured before and after the xenon text on the laminate samples. The larger the numerical value L, the higher the brightness.

Die Helligkeitsmessung erfolgte mit Hilfe des Elephro 2000 Farbmessgeräts (Fa. Data Color).The brightness was measured using the Elephro 2000 color measuring device (Data Color).

Die Prüfergebnisse sind in Tabelle 3 zusammengestellt. Wie aus der Tabelle ersichtlich, ist die Lichtstabilität ( L) bei den erfindungsgemäßen Basispapieren höher als in den Papieren ohne Zusatz von anionischen anorganischen Partikeln (V1) oder in Papieren mit üblichen Retentionsmitteln (V2, V3).The test results are summarized in Table 3. As can be seen from the table, the light stability (L) is higher in the base papers according to the invention than in the papers without the addition of anionic inorganic particles (V1) or in papers with conventional retention aids (V2, V3).

Auch eine Erhöhung der Gesamtretention und dadurch ein besserer Nutzungsgrad des Füllstoffs und eine daraus folgende sauberere Kreislaufführung kann bei der erfindungsgemäßen Papierherstellung erreicht werden. Tabelle 3 Prüfergebnisse Beispiel Retention % Lichtechtheit*) L1 L2 ΔL 1a 57 87,16 87,08 - 0,08 1b 67 88,40 88,40 0,00 1c 69 88,12 88,08 - 0,04 1d 68 88,10 88,05 - 0,05 2a 65 85,40 85,37 - 0,03 2b 62 84,50 84,42 - 0,08 2c 60 84,52 84,49 - 0,03 V1 54 87,22 86,99 - 0,23 V2 55 87,16 86,84 - 0,32 V3 55 83,68 83,38 - 0,30 *) L₁ - Helligkeit vor Belichtung mit Xenon-Lampe L₂ - Helligkeit nach Belichtung mit Xenon-Lampe An increase in the overall retention and thereby a better degree of utilization of the filler and a consequent cleaner circulation can also be achieved in the paper production according to the invention. Table 3 Test results example Retention% Lightfastness *) L1 L2 ΔL 1a 57 87.16 87.08 - 0.08 1b 67 88.40 88.40 0.00 1c 69 88.12 88.08 - 0.04 1d 68 88.10 88.05 - 0.05 2a 65 85.40 85.37 - 0.03 2 B 62 84.50 84.42 - 0.08 2c 60 84.52 84.49 - 0.03 V1 54 87.22 86.99 - 0.23 V2 55 87.16 86.84 - 0.32 V3 55 83.68 83.38 - 0.30 *) L₁ - brightness before exposure with xenon lamp L₂ - brightness after exposure with xenon lamp

Claims (10)

Basispapier für dekorative Beschichtungssysteme, das aus einer Papiermasse gebildet ist, die neben Cellulosefasern wenigstens einen Füllstoff und ein naßfest machendes kationisches Harz enthält, dadurch gekennzeichnet, daß die Papiermasse zusätzlich anionische anorganische Partikeln enthält.Base paper for decorative coating systems, which is formed from a paper pulp which, in addition to cellulose fibers, contains at least one filler and a wet-strengthening cationic resin, characterized in that the paper pulp additionally contains anionic inorganic particles. Basispapier nach Anspruch 1, dadurch gekennzeichnet, daß die anionischen anorganischen Partikeln eine kolloidale Kieselsäure, eine kolloidale aluminiummodifizierte Kieselsäure oder ein natrium- oder aluminiummodifiziertes Silikat sind.Base paper according to claim 1, characterized in that the anionic inorganic particles are a colloidal silica, a colloidal aluminum-modified silica or a sodium- or aluminum-modified silicate. Basispapier nach Anspruch 1 und 2, dadurch gekennzeichnet, daß die Menge der anionischen anorganischen Partikeln bis 0,5 Gew.%, insbesondere 0,01 bis 0,25 Gew.%, beträgt, bezogen auf den Zellstoffaseranteil.Base paper according to Claims 1 and 2, characterized in that the amount of the anionic inorganic particles is up to 0.5% by weight, in particular 0.01 to 0.25% by weight, based on the cellulose fiber content. Basispapier nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß der Füllstoff Titandioxid, Calciumcarbonat, Kaolin, China-Clay, Talkum oder eine Mischung daraus ist.Base paper according to claims 1 to 3, characterized in that the filler is titanium dioxide, calcium carbonate, kaolin, china clay, talc or a mixture thereof. Basispapier nach Anspruch 4, dadurch gekennzeichnet, daß die Menge des Titandioxids in der Papiermasse zwischen 1 bis 55 Gew.%, insbesondere 25 bis 45 Gew.%, beträgt.Base paper according to claim 4, characterized in that the amount of titanium dioxide in the paper pulp is between 1 to 55% by weight, in particular 25 to 45% by weight. Verfahren zur Herstellung eines Baispapiers für dekorative Beschichtungssysteme aus einer Zellstoff, Füllstoff, wenigstens ein naßfest machendes kationisches Harz sowie gegebenenfalls weitere Zusatzstoffe enthaltenden Papierstoffsuspension, dadurch gekennzeichnet, daß der Papierstoffsuspension anionische anorganische Partikeln zugesetzt werden und aus dieser Suspension ein Papier gefertigt wird.A process for the production of a base paper for decorative coating systems from a cellulose, filler, at least one cationic resin which strengthens the wet strength and optionally also paper pulp suspension containing further additives, characterized in that anionic inorganic particles are added to the paper pulp suspension and a paper is made from this suspension. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß der Füllstoff Titandioxid, Calciumcarbonat, Kaolin, China-Clay, Talkum oder eine Mischung daraus ist.A method according to claim 6, characterized in that the filler is titanium dioxide, calcium carbonate, kaolin, china clay, talc or a mixture thereof. Verfahren nach Anspruch 6 und 7, dadurch gekennzeichnet, daß die anionischen anorganischen Partikeln eine kolloidale Kieselsäure, eine kolloidale aluminiummodifizierte Kieselsäure oder ein kolloidales natrium- oder aluminiummodifiziertes Silikat sind.Process according to Claims 6 and 7, characterized in that the anionic inorganic particles are a colloidal silica, a colloidal aluminum-modified silica or a colloidal sodium or aluminum-modified silicate. Verfahren nach Anspruch 6 bis 8, dadurch gekennzeichnet, daß die anionischen anorganischen Partikeln im Dünnstoff und/oder kurz vor dem Stoffauflauf zugesetzt werden.Process according to Claims 6 to 8, characterized in that the anionic inorganic particles are added in the thin material and / or shortly before the headbox. Verfahren nach Anspruch 6 bis 8, dadurch gekennzeichnet, daß die anionischen anorganischen Partikeln im Dickstoff zugesetzt werden.Process according to Claims 6 to 8, characterized in that the anionic inorganic particles are added in the thick material.
EP95115392A 1994-10-05 1995-09-29 Base paper for decorative coating Withdrawn EP0705939A1 (en)

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