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EP0396789B1 - Process for making release paper with a special surface coating - Google Patents

Process for making release paper with a special surface coating Download PDF

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Publication number
EP0396789B1
EP0396789B1 EP89108274A EP89108274A EP0396789B1 EP 0396789 B1 EP0396789 B1 EP 0396789B1 EP 89108274 A EP89108274 A EP 89108274A EP 89108274 A EP89108274 A EP 89108274A EP 0396789 B1 EP0396789 B1 EP 0396789B1
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EP
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Prior art keywords
platinum
process according
complexes
catalysts
added
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EP89108274A
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German (de)
French (fr)
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EP0396789A1 (en
Inventor
Bernd Dr. Ing. Reinhardt
Leif Dipl. Ing. Frilund
Volker Viehmeyer
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Kammerer GmbH
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Kammerer GmbH
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Priority to EP89108274A priority Critical patent/EP0396789B1/en
Priority to AT89108274T priority patent/ATE84087T1/en
Priority to DE8989108274T priority patent/DE58903181D1/en
Priority to ES198989108274T priority patent/ES2036746T3/en
Publication of EP0396789A1 publication Critical patent/EP0396789A1/en
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Publication of EP0396789B1 publication Critical patent/EP0396789B1/en
Priority to GR920300096T priority patent/GR920300096T1/el
Priority to GR930400643T priority patent/GR3007456T3/el
Anticipated expiration legal-status Critical
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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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • D21H19/824—Paper comprising more than one coating superposed two superposed coatings, both being non-pigmented
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/001—Release paper

Definitions

  • the invention relates to a process for the production of release paper, in which the paper is coated with a suspension of film-forming substances before the application of a silicone coating.
  • Release papers can also be coated with pigment-binder combinations with the application devices already mentioned.
  • pigment-binder combinations mainly latices are used as binders and white pigments such as kaolin and / or calcium carbonate (see “Coating” (1987), No. 10, pp. 366-372 and (1987), No. 11, pp. 396 - 398).
  • aqueous silicone systems emulsions
  • PVA or CMC aqueous film formers and thickeners
  • the silicone resin used always forms the main component, since it primarily influences the adhesive effect of the papers coated in this way with a special purpose (for example baking release papers, sack papers with hydrophobic properties, etc.).
  • the aqueous silicone systems contain organopolysiloxanes, e.g. Polydimethylsiloxanes, to which catalysts, crosslinking agents (e.g. based on methylhydrogen siloxanes), optionally also adhesives (e.g. water-soluble reactive silane esters) and controlled release additives are added (see “Adhesion” (1973), No. 7).
  • organopolysiloxanes e.g. Polydimethylsiloxanes
  • crosslinking agents e.g. based on methylhydrogen siloxanes
  • adhesives e.g. water-soluble reactive silane esters
  • controlled release additives controlled release additives are added (see "Adhesion" (1973), No. 7).
  • the manufacturers of these aqueous silicone systems predominantly already offer the base polymer with crosslinker or catalyst additive (crosslinker or catalyst emulsions).
  • the further components are then added by the processor shortly before use (raw paper coating) in order to achieve the desired
  • the object of the present invention is Release papers with special surface coatings, but without producing any additional abhesive effects, which enable better adhesion and faster crosslinking of subsequent, conventional, separate coatings with a wide variety of silicone resins.
  • This object of producing release papers of the type described at the outset is achieved in that the suspension contains up to 25% (calculated) catalysts for crosslinking the silicone coating in the form of an aqueous emulsion.
  • z. B As a catalyst or as a catalyst component for the aqueous emulsion, z. B. the following substances are used: Finely divided platinum, ruthenium, rhodium, palladium, iridium and compounds or complexes of these elements, in particular platinum halides such as PtCl4 platinum (IV) chloric acid and Na2PtCl n ⁇ 4H2O, platinum-olefin complexes, platinum-alcohol or platinum-alcoholate complexes, Platinum-ether complexes, platinum-aldehyde complexes, platinum-ketone complexes and platinum-vinyl-siloxane complexes; also iron, nickel and cobalt carbonyls.
  • platinum halides such as PtCl4 platinum (IV) chloric acid and Na2PtCl n ⁇ 4H2O
  • platinum-olefin complexes platinum-alcohol or platinum-alcoholate complexes
  • the coated paper was placed on a metal sieve in a forced air oven operated at 150 ° C.
  • the crosslinking time was set differently in order to follow the influence of the catalyst emulsions on the crosslinking and anchoring process.
  • Table 1 only the shortest crosslinking times are recorded, during which complete hardening and anchoring (adhesion) of the silicone layer is still guaranteed.
  • a paper As a reference paper (blank), i.e. a paper without the addition of catalysts, a paper was used which had also gone through the treatment steps described above, but contained no further additives in the PVA / CMC solution.
  • Example 1 The procedure of Example 1 was repeated. After the catalyst emulsion had been added, however, the pH was raised to 9.0 using ammonia. The results of the crosslinking tests are shown in Table 1 below.
  • Example 1 The procedure of Example 1 was repeated, but instead of coating the test paper with the solvent-free silicone system described in part b) of Example 1, a solvent-containing system with the following composition was chosen: 74 parts white spirit 20 parts of base polymer silicone 0.2 parts crosslinker 0.8 parts catalyst The siliconization was carried out analogously to Example 1, part b) using a laboratory doctor device, the silicon application again being approximately 1 g / m 2 (calculated). The shortest networking times determined are shown in Table 1.
  • Example 2 The procedure of Example 2 was repeated. However, the laboratory siliconization was carried out using the solvent-containing silicone systems described in Example 3. The minimum required networking times are shown in Table 1.
  • Example 1 The procedure of Example 1 was repeated. However, instead of 3 g, this time 6 g of catalyst emulsion was added to the solution of 22 g of polyvinyl alcohol and 3 g of carboxymethyl cellulose in 475 g of water. The pH of this mixture was again adjusted to 4.0 with sulfuric acid. The further processing corresponded to the procedure described in Example 1. The results of the crosslinking test are summarized in Table 1.
  • Example 5 The procedure of Example 5 was repeated, but the pH of the coating mixture was raised to 9.0 with ammonia. The results of the crosslinking test are shown in Table 1.
  • Example 5 The procedure of Example 5 was repeated. However, the test paper was coated with a solvent-containing silicone system from ICI. The composition of this coating composition has already been described in Example 3. The results of the crosslinking test are shown in Table 1.
  • Example 6 The procedure of Example 6 was repeated. However, laboratory siliconization was carried out using the solvent-containing silicone system described in Example 3. The shortest networking times required can be found in Table 1.

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Abstract

A process for modifying the surface of raw release papers is described, in which a suspension of film-forming substances is applied within or outside the paper machine by means of conventional applicators to the paper web, if appropriate with the addition of a white pigment, which suspension already contains a fraction of up to 25% of a catalyst in the form of an aqueous emulsion.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von Trennrohpapieren, bei dem vor dem Auftragen einer Silikonbeschichtung das Papier mit einer Suspension filmbildender Substanzen beschichtet wird.The invention relates to a process for the production of release paper, in which the paper is coated with a suspension of film-forming substances before the application of a silicone coating.

Es ist bekannt, Trennrohpapiere innerhalb der Papiermaschine zu beschichten. Dazu werden übliche Imprägnier- oder Oberflächenlösungen aus Polyvinylalkohol (PVA), Stärkederivaten, Carboxymethylcellulose (CMC), Alginat, Protein u.a.m. sowie Polymerdispersionen (Latices) allein oder in Kombination mit bekannten Auftragsvorrichtungen wie Walzen-, Klingen- oder Luftbürsten-Auftragswerke oder Tauchimprägniervorrichtungen auf die Papieroberfläche aufgetragen. Je nach Konzentration, Temperatur und Viskosität dieser Beschichtungsmassen, wird eine reine Oberflächenabdeckung des Papieres, eine teilweise oder vollständige Penetration der Beschichtungsmassen in das Rohpapier erreicht (s. "Coating" (1986), Nr. 7, S. 218 - 221 sowie (1986), Nr. 8, S. 262 - 268).It is known to coat release papers within the paper machine. Common impregnation or surface solutions made from polyvinyl alcohol (PVA), starch derivatives, carboxymethyl cellulose (CMC), alginate, protein etc. are used. as well as polymer dispersions (latices) applied to the paper surface alone or in combination with known application devices such as roller, blade or air brush application devices or immersion impregnation devices. Depending on the concentration, temperature and viscosity of these coating materials, a pure surface covering of the paper, a partial or complete penetration of the coating materials into the base paper is achieved (see "Coating" (1986), No. 7, pp. 218-221 and (1986 ), No. 8, pp. 262 - 268).

Trennrohpapiere können aber auch mit Pigment-ßindemitteln Kombinationen mit den bereits genannten Auftragsvorrichtungen beschichtet werden. Dazu werden vorwiegend Latices als Bindemittel und Weißpigmente wie Kaolin und/oder Calciumcarbonat verwendet (s. "Coating" (1987), Nr. 10, S. 366 - 372 und (1987), Nr. 11, S. 396 - 398).Release papers can also be coated with pigment-binder combinations with the application devices already mentioned. For this purpose, mainly latices are used as binders and white pigments such as kaolin and / or calcium carbonate (see "Coating" (1987), No. 10, pp. 366-372 and (1987), No. 11, pp. 396 - 398).

Es ist weiterhin bekannt, Trennrohpapiere innerhalb der Papiermaschine mit wäßrigen Silikonsystemen (Emulsionen) zur Erzielung einer gewissen Abhäsivwirkung zu beschichten, wobei diesen wäßrigen Silikonsystemen verschiedene Filmbildner und Verdickungsmittel, meist PVA oder CMC, zugemischt werden können. Das verwendete Silikonharz bildet dabei aber immer die Hauptkomponente, da es die Abhäsivwirkung der so beschichteten Papiere mit speziellem Verwendungszweck (z.B. Backtrennpapiere, Sackpapiere mit hydrophoben Eigenschaften u.a.m.) primär beeinflußt.It is also known to coat release papers within the paper machine with aqueous silicone systems (emulsions) to achieve a certain abhesive effect, whereby Various aqueous film formers and thickeners, usually PVA or CMC, can be added to these aqueous silicone systems. However, the silicone resin used always forms the main component, since it primarily influences the adhesive effect of the papers coated in this way with a special purpose (for example baking release papers, sack papers with hydrophobic properties, etc.).

Diese so beschichteten Papiere sind jedoch nicht für den technischen Sektor mit dem dort geforderten streng definierten und reprodzierbaren Trennkraftniveau einsetzbar. Dafür muß auf separaten Beschichtungsanlagen eine Silikonisierung, u.a. mit Silikonemulsionen, erfolgen. Die meist 40..50 %igen wäßrigen, thermisch vernetzbaren Emulsionen werden dann mit bekannten Auftragsvorrichtungen, wie z.B. der Rasterwalze, auf das Rohpapier aufgetragen.However, these papers coated in this way cannot be used for the technical sector with the strictly defined and reproducible release force level required there. For this, siliconization must be carried out on separate coating systems, e.g. with silicone emulsions. The usually 40..50% aqueous, thermally crosslinkable emulsions are then applied using known application devices, such as e.g. the anilox roller, applied to the base paper.

Die wäßrigen Silikonsysteme enthalten als Basispolymer Organopolysiloxane, z.B. Polydimethylsiloxane, denen Katalysatoren, Vernetzer (z.B. auf der Basis von Methylwasserstoffsiloxanen), gegebenenfalls noch Haftmittel (z.B. wasserlösliche reaktive Silanester) sowie "Controlled Release"-Additive zugesetzt werden (s. "Adhäsion" (1973), Nr. 7). Die Hersteller dieser wäßrigen Silikonsysteme bieten vorwiegend bereits das Basispolymer mit Vernetzer- oder Katalysatorzusatz an (Vernetzer- bzw. Katalysatoremulsionen). Die weiteren Komponenten werden dann erst kurz vor der Verwendung (Rohpapierbeschichtung) vom Verarbeiter zugesetzt, um die gewünschten Abhäsiveigenschaften der so beschichteten Papiere zu erreichen.The aqueous silicone systems contain organopolysiloxanes, e.g. Polydimethylsiloxanes, to which catalysts, crosslinking agents (e.g. based on methylhydrogen siloxanes), optionally also adhesives (e.g. water-soluble reactive silane esters) and controlled release additives are added (see "Adhesion" (1973), No. 7). The manufacturers of these aqueous silicone systems predominantly already offer the base polymer with crosslinker or catalyst additive (crosslinker or catalyst emulsions). The further components are then added by the processor shortly before use (raw paper coating) in order to achieve the desired abhesive properties of the papers coated in this way.

Aufgabe der vorliegenden Erfindung ist es jedoch, Trennrohpapiere mit speziellen Oberflächenstrichen, aber ohne irgendwelche zusätzlichen Abhäsivwirkungen herzustellen, die eine bessere Haftung und schnellere Vernetzung nachfolgender üblicher, separater Beschichtungen mit den unterschiedlichsten Silikonharzen ermöglichen.However, the object of the present invention is Release papers with special surface coatings, but without producing any additional abhesive effects, which enable better adhesion and faster crosslinking of subsequent, conventional, separate coatings with a wide variety of silicone resins.

Gelöst wird diese Aufgabe der Herstellung von Trennrohpapieren der eingangs beschriebenen Art dadurch, daß die Suspension bis 25 % (fest gerechnet) Katalysatoren zur Vernetzung der Silikonbeschichtung in Form einer wäßrigen Emulsion enthält.This object of producing release papers of the type described at the outset is achieved in that the suspension contains up to 25% (calculated) catalysts for crosslinking the silicone coating in the form of an aqueous emulsion.

Überraschenderweise wurde gefunden, daß ein relativ geringer Zusatz von Katalysatoren in Form von wäßrigen Katalysatoremulsionen zu üblicherweise verwendeten Oberflächenpräparationen für Trennrohpapiere zu Verbesserungen der Haftung und Vernetzung nachfolgender separater Silikonaufträge unterschiedlichen chemischen Aufbaus führt, ohne daß dem so erfindungsgemäß oberflächenbehandelten (primergestrichenen) Trennrohpapier dadurch zusätzliche abhäsive Eigenschaften verliehen worden wären.Surprisingly, it was found that a relatively small addition of catalysts in the form of aqueous catalyst emulsions to customarily used surface preparations for release base papers leads to improvements in the adhesion and crosslinking of subsequent separate silicone applications of different chemical compositions, without the release agent paper thus surface-treated (primer-coated) in this way having additional adhesive properties would have been awarded.

Als Katalysator bzw. als Katalysatorkomponente für die wäßrige Emulsion, können z. B. folgende Substanzen eingesetzt werden:
   Feinteiliges Platin, Ruthenium, Rhodium, Palladium, Iridium und Verbindungen oder Komplexe dieser Elemente, insbesondere Platinhalogenide wie PtCl₄ Platin(IV)-chlorsäure und Na₂PtCln ·4H₂O, Platin-Olefin-Komplexe, Platin-Alkohol- oder Platin-Alkoholat-Komplexe, Platin-Äther-Komplexe, Platin-Aldehyd-Komplexe, Platin-Keton-Komplexe und Platin-Vinyl-Siloxan-Komplexe; ferner Eisen-, Nickel- und Kobaltcarbonyle.As a catalyst or as a catalyst component for the aqueous emulsion, z. B. the following substances are used:
Finely divided platinum, ruthenium, rhodium, palladium, iridium and compounds or complexes of these elements, in particular platinum halides such as PtCl₄ platinum (IV) chloric acid and Na₂PtCl n · 4H₂O, platinum-olefin complexes, platinum-alcohol or platinum-alcoholate complexes, Platinum-ether complexes, platinum-aldehyde complexes, platinum-ketone complexes and platinum-vinyl-siloxane complexes; also iron, nickel and cobalt carbonyls.

Weitere Merkmale des Verfahrens sind in den Unteransprüchen gekennzeichnet.Further features of the method are characterized in the subclaims.

Nachfolgende Beispiele verdeutlichen diese unerwarteten Reaktionen besser.The following examples illustrate these unexpected reactions better.

Beispiel 1example 1

  • a) Es wird eine Mischung aus 22 g Polyvinylalkohol und 3 g Carboxymethylcellulose in 475 g Wasser in einem Glasbehälter angesetzt und im Wasserbad auf 90 °C aufgewärmt. Die Kochzeit der PVA-CMC-Suspension beträgt 20 min, wobei sich CMC und PVA völlig im Wasser lösten. Nach dem Kochvorgang wird unter Rühren 3 g von mindestens 3 Si-gebundenen Wasserstoffatomen je Molekül aufweisenden Organopolysiloxan als Basispolymer mit einem Zusatz von Pt-Katalysator in Form einer 40 %igen Emulsion zugegeben. Die pH-Wert-Einstellung dieser Mischung auf 4,0 erfolgte mit Schwefelsäure.
    Die auf diese Weise hergestellte Dispersion, wird mit einer Laborleimpresse auf ein unsatiniertes Silikonrohpapier mit einem Flächengehalt von 66 g/m² aufgetragen. Das Auftragsgewicht ist etwa 1,5 g/m² (fest gerechnet). Das ungestrichene Rohpapier wies eine Porosität nach Schopper von ca. 60 ccm³/min und einen Leimungsgrad nach Cobb-Unger von 50 g/m² auf. Nach erfolgter Trocknung und Wiederbefeuchtung wurde das damit oberflächenbehandelte Papier in einem Zweiwalzen-Laborkalander satiniert. Der Liniendruck betrug dabei 4000 dN/cm. Die Oberflächentemperatur der Stahlwalze betrug 100 °C.    a) A mixture of 22 g of polyvinyl alcohol and 3 g of carboxymethyl cellulose in 475 g of water is prepared in a glass container and heated to 90 ° C. in a water bath. The cooking time of the PVA-CMC suspension is 20 minutes, with the CMC and PVA completely dissolving in the water. After the cooking process, 3 g of at least 3 Si-bonded hydrogen atoms per molecule containing organopolysiloxane are added as the base polymer with the addition of Pt catalyst in the form of a 40% emulsion. The pH of this mixture was adjusted to 4.0 using sulfuric acid.
    The dispersion produced in this way is applied with a laboratory size press to unsatinated silicone base paper with a surface area of 66 g / m². The application weight is about 1.5 g / m² (calculated). The uncoated base paper had a Schopper porosity of approx. 60 ccm³ / min and a Cobb-Unger degree of sizing of 50 g / m². After drying and rewetting, the paper treated with it was satinized in a two-roll laboratory calender. The line pressure was 4000 dN / cm. The surface temperature of the steel roller was 100 ° C.
  • b) Das so erhaltene Papier wurde in einem Laborverfahren silikonisiert. Die Silikonisierung erfolgte mit einem Rakelauftragsgerät des Typs KCC 302, das mit Hilfe verschiedener drahtumwickelter Metallstäbe das jeweilige Silikon mit konstanter Geschwindigkeit auf die Papierbogen aufträgt. Für die Silikonbeschichtung wurde ein herkömmliches lösungsmittelfreies Polysiloxansystem mit folgender Zusammensetzung eingesetzt:
       100 Teile Basispolymer-Silikon der Fa. Wacker
       80 Teile Testbenzin (Siedebereich 60-80 °C)
       2,5 Teile Vernetzer
       1,0 Teile Katalysator
    Die Silikonauftragsmenge betrug etwa 1 g/m² (fest gerechnet).    b) The paper thus obtained was siliconized in a laboratory process. Siliconization was carried out using a KCC 302 squeegee applicator, which uses various wire-wrapped metal rods to apply the respective silicone to the paper sheets at a constant speed. A conventional solvent-free polysiloxane system with the following composition was used for the silicone coating:
    100 parts of base polymer silicone from Wacker
    80 parts white spirit (boiling range 60-80 ° C)
    2.5 parts of crosslinker
    1.0 part catalyst
    The amount of silicone applied was about 1 g / m² (calculated).

Zur Vernetzung der aufgetragenen Silikonschicht wurde das beschichtete Papier in einem bei 150 °C betriebenen Umluftofen auf ein Metallsieb gelegt.To crosslink the applied silicone layer, the coated paper was placed on a metal sieve in a forced air oven operated at 150 ° C.

Die Vernetzungszeit wurde unterschiedlich eingestellt, um den Einfluß der Katalysatoremulsionen auf den Vernetzungs- und Verankerungsvorgang zu verfolgen. In der nachstehenden Tabelle 1 sind nur die kürzesten Vernetzungszeiten aufgezeichnet, bei denen noch eine völlige Aushärtung und Verankerung (Haftung) der Silikonschicht gewährleistet ist.The crosslinking time was set differently in order to follow the influence of the catalyst emulsions on the crosslinking and anchoring process. In Table 1 below, only the shortest crosslinking times are recorded, during which complete hardening and anchoring (adhesion) of the silicone layer is still guaranteed.

Die bei verschiedenen Zeiten gehärteten Papiermuster wurden sofort einem Rubbeltest unterworfen, wobei mit dem Finger 8-10 mal über den Silikonfilm gerieben wird. Der Druck wird so gewählt, daß sich die Fingerspitze beim Reiben deutlich erwärmt. Eine Störung in der Silikonbeschichtung zeigt sich in Form von abgeriebenen Wülsten ("rub off") und als matte Stelle ("smear"), wenn man den Papierbogen unter dem Schräglicht betrachtet.The paper samples hardened at different times were immediately subjected to a scratch test, with the finger being rubbed 8-10 times over the silicone film. The pressure is selected so that the fingertip heats up significantly when rubbed. A disturbance in the silicone coating shows itself in the form of rubbed off beads ("rub off") and as a matt spot ("smear") if you look at the sheet of paper under the bevel.

Als Vergleichspapier (Nullprobe), d.h. ein Papier ohne Zusatz von Katalysatoren, wurde ein Papier eingesetzt, das ebenfalls die oben beschriebenen Behandlungsstufen durchlaufen hatte, aber keine weiteren Zusätze in der PVA/CMC-Lösung enthielt.As a reference paper (blank), i.e. a paper without the addition of catalysts, a paper was used which had also gone through the treatment steps described above, but contained no further additives in the PVA / CMC solution.

Beispiel 2Example 2

Die Arbeitsweise des Beispiels 1 wurde wiederholt. Nach Zugabe der Katalysatoremulsion wurde jedoch der ph-Wert mit Hilfe von Ammoniak auf 9,0 angehoben. Die Ergebnisse der Vernetzungstests sind aus der nachfolgenden Tabelle 1 zu entnehmen.The procedure of Example 1 was repeated. After the catalyst emulsion had been added, however, the pH was raised to 9.0 using ammonia. The results of the crosslinking tests are shown in Table 1 below.

Beispiel 3Example 3

Die Arbeitsweise des Beispiels 1 wurde wiederholt, aber anstelle einer Beschichtung des Versuchspapiers mit dem in Teil b) des Beispiels 1 beschriebenen lösungsmittelfreien Silikonsystem wurde ein lösungsmittelhaltiges System mit folgender Zusammensetzung gewählt:
   74 Teile Testbenzin
   20 Teile Basispolymer-Silikon
   0,2 Teile Vernetzer
   0,8 Teile Katalysator
Die Silikonisierung erfolgte analog Beispiel 1, Teil b) mit einem Laborrakelgerät, wobei der Silikonauftrag wiederum etwa 1 g/m² (fest gerechnet) betrug. Die ermittelten kürzesten Vernetzungszeiten sind der Tabelle 1 zu entnehmen.The procedure of Example 1 was repeated, but instead of coating the test paper with the solvent-free silicone system described in part b) of Example 1, a solvent-containing system with the following composition was chosen:
74 parts white spirit
20 parts of base polymer silicone
0.2 parts crosslinker
0.8 parts catalyst
The siliconization was carried out analogously to Example 1, part b) using a laboratory doctor device, the silicon application again being approximately 1 g / m 2 (calculated). The shortest networking times determined are shown in Table 1.

Beispiel 4Example 4

Die Arbeitsweise des Bespiels 2 wurde wiederholt. Die Laborsilikonisierung erfolgte jedoch mit dem in Beispiel 3 beschriebenen lösungsmittelhaltigen Silikonsystemen. Die minimal erforderlichen Vernetzungszeiten sind der Tabelle 1 zu entnehmen.The procedure of Example 2 was repeated. However, the laboratory siliconization was carried out using the solvent-containing silicone systems described in Example 3. The minimum required networking times are shown in Table 1.

Beispiel 5Example 5

Die Arbeitsweise des Beispiels 1 wurde wiederholt. Zu der Lösung aus 22 g Polyvinylalkohol und 3 g Carboxymethylcellulose in 475 g Wasser wurde jedoch unter Rühren statt 3 g diesmal 6 g Katalysatoremulsion zugegeben. Der ph-Wert dieser Mischung wurde wiederum mit Schwefelsäure auf 4,0 eingestellt. Die weitere Verarbeitung entsprach der in Beispiel 1 beschriebenen Arbeitsweise. Die Ergebnisse des Vernetzungstests sind in der Tabelle 1 zusammengestellt.The procedure of Example 1 was repeated. However, instead of 3 g, this time 6 g of catalyst emulsion was added to the solution of 22 g of polyvinyl alcohol and 3 g of carboxymethyl cellulose in 475 g of water. The pH of this mixture was again adjusted to 4.0 with sulfuric acid. The further processing corresponded to the procedure described in Example 1. The results of the crosslinking test are summarized in Table 1.

Beispiel 6Example 6

Die Arbeitsweise des Beispiels 5 wurde wiederholt, der ph-Wert der Strichmischung jedoch mit Ammoniak auf 9,0 angehoben. Die Ergebnisse der Vernetzungsprüfung gehen aus der Tabelle 1 hervor.The procedure of Example 5 was repeated, but the pH of the coating mixture was raised to 9.0 with ammonia. The results of the crosslinking test are shown in Table 1.

Beispiel 7Example 7

Die Arbeitsweise des Beispiels 5 wurde wiederholt. Das Versuchspapier wurde jedoch mit einem lösungsmittelhaltigen Silikonsystem der Firma ICI beschichtet. Die Zusammensetzung dieser Beschichtungsmasse ist bereits in Beispiel 3 beschrieben worden. Die Ergebnisse der Vernetzungsprüfung sind in der Tabelle 1 dargestellt.The procedure of Example 5 was repeated. However, the test paper was coated with a solvent-containing silicone system from ICI. The composition of this coating composition has already been described in Example 3. The results of the crosslinking test are shown in Table 1.

Beispiel 8Example 8

Die Arbeitsweise des Beispiels 6 wurde wiederholt. Die Laborsilikonisierung erfolgte jedoch mit dem in Beispiel 3 beschriebenen lösungsmittelhaltigen Silikonsystem. Die erforderlichen kürzesten Vernetzungszeiten sind in der Tabelle 1 zu entnehmen.The procedure of Example 6 was repeated. However, laboratory siliconization was carried out using the solvent-containing silicone system described in Example 3. The shortest networking times required can be found in Table 1.

Beispiele 9 - 12Examples 9-12

Als Vergleich (Nullprobe) wurden Papierproben herangezogen, die mit einer Mischung, bestehend aus 22 g Polyvinylalkohol und 3 g Carboxymethylcellulose in 475 g Wasser, ober ohne jegliche Zugabe von Katalysatoremulsion, oberflächenveredelt worden waren. Die ph-Werte dieser Oberflächenpräparationen wurden sowohl auf 4,0 als auch auf 9,0 eingestellt. Die Laborsilikonisierung erfolgte mit den im Teil b) des Beispiels und im Beispiels 3 beschriebenen Katalysatoremulsionen. Die erforderliche minimale Vernetzungskraft ist aus der Tabelle 1 zu entnehmen. Tabelle 1 Beispiel ph-Wert der präparation Oberflächen kürzeste Vernetzungszeit in s, bei der eine völlige Aushärtung gegeben ist (150 °C) 4,0 9,0 LF* LH* 1 x 5 2 x 5 3 x 5 4 x 10 5 x 3 6 x 3 7 5 8 10 9,10 (Nullprobe) x 10 20 11,12 (Nullprobe) x 15 20 *LF= lösungsmittelfreies Silikonsystem ) jeweils ca. 1g/m² (fest)
LH= lösungsmittelhaltiges Silikonsystem) Silikonauftrag As a comparison (zero sample), paper samples were used which had been surface-finished with a mixture consisting of 22 g of polyvinyl alcohol and 3 g of carboxymethyl cellulose in 475 g of water, without the addition of any catalyst emulsion. The pH values of these surface preparations were set to both 4.0 and 9.0. The laboratory siliconization was carried out using those in part b) of the example and in example 3 described catalyst emulsions. The minimum crosslinking force required can be found in Table 1. Table 1 example pH value of the preparation surfaces shortest crosslinking time in s, at which a complete hardening is given (150 ° C) 4.0 9.0 LF * LH * 1 x 5 2nd x 5 3rd x 5 4th x 10th 5 x 3rd 6 x 3rd 7 5 8th 10th 9.10 (blank) x 10th 20th 11.12 (blank) x 15 20th * LF = solvent-free silicone system) each approx. 1g / m² (solid)
LH = solvent-containing silicone system) silicone application

Claims (10)

  1. Process for the production of release papers, wherein, before the application of a silicone coating, the paper is coated with a suspension of film-forming substances, characterized in that the suspension contains up to 25% (solid weight) of catalysts for cross-linking the silicone coating in the form of an aqueous emulsion.
  2. Process according to Claim 1, characterized in that there are used as catalysts, platinum, ruthenium, rhodium, palladium, iridium and compounds or complexes of these elements, such as platinum halide, platinum (IV)-chloric acid and Na₂PtCLn·4H₂O, platinum-olefin complexes, platinum-alcohol or alcoholate complexes, platinum-ether complexes, platinum-aldehyde complexes, platinum-ketone complexes and platinum-vinyl siloxane complexes; furthermore, iron, nickel and cobalt carbonyls.
  3. Process according to Claim 2, characterized in that platinum tetrachloride is used as platinum halide.
  4. Process according to Claims 1 to 3, characterized in that these catalysts are added in the form of aqueous emulsions in proportions of 1 to 25% (solid weight) of usual surface preparations of film-forming substances for release papers, alone or in combinations, in a pH range of 2 to 11.
  5. Process according to Claim 4, characterized in that the catalysts are added in the form of aqueous emulsions in proportions of 3-10% (solid weight) and that polyvinyl alcohol, carboxymethylcellulose, starch derivatives, alginate or polymer dispersions are used as film-forming substances, at a pH value in the range of 4 to 9.5.
  6. Process according to Claims 1 to 5, characterized in that pigmented coating compositions of binding agents, alone or in combination with white pigments, are added to these catalysts in the form of the aqueous emulsions, in the pH range from 5 to 11, preferably 7 to 9.5.
  7. Process according to Claim 6, characterized in that the pigmented coating compositions, to which the catalysts are added in the form of their aqueous emulsions, contain as binding agents copolymer dispersions (latexes) on the bases of acrylic acid, acrylic acid ester, acrylonitrile, vinyl acetate and carboxymethylcellulose.
  8. Process according to Claim 7, characterized in that kaolin, calcium carbonate and titanium dioxide, alone or in combination, are added as white pigment in the coating compositions.
  9. Process according to Claims 1 to 8, characterized in that the surface application is carried out by means of conventional application devices onto an already formed paper sheet having a residual humidity of between 1 and 14%, preferably between 2 and 8%.
  10. Use of a release paper, produced by the method according to one of Claims 1 to 9, as packaging material for sticky goods, for bakery products, as foodstuffs packaging, for plastics laminates, so-called laminated sheets, chipboards and for the self-adhesive sector.
EP89108274A 1989-05-09 1989-05-09 Process for making release paper with a special surface coating Expired - Lifetime EP0396789B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP89108274A EP0396789B1 (en) 1989-05-09 1989-05-09 Process for making release paper with a special surface coating
AT89108274T ATE84087T1 (en) 1989-05-09 1989-05-09 PROCESS FOR THE MANUFACTURE OF RELEASE PAPER WITH SPECIAL SURFACE COATINGS.
DE8989108274T DE58903181D1 (en) 1989-05-09 1989-05-09 METHOD FOR PRODUCING SLEEPING PAPER PAPERS WITH SPECIAL SURFACE COATINGS.
ES198989108274T ES2036746T3 (en) 1989-05-09 1989-05-09 PROCEDURE FOR PREPARING PAPERS SEPARATION SUPPORT WITH SPECIAL SURFACE COATINGS.
GR920300096T GR920300096T1 (en) 1989-05-09 1993-02-17
GR930400643T GR3007456T3 (en) 1989-05-09 1993-03-24

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP89108274A EP0396789B1 (en) 1989-05-09 1989-05-09 Process for making release paper with a special surface coating

Publications (2)

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EP0396789A1 EP0396789A1 (en) 1990-11-14
EP0396789B1 true EP0396789B1 (en) 1992-12-30

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EP89108274A Expired - Lifetime EP0396789B1 (en) 1989-05-09 1989-05-09 Process for making release paper with a special surface coating

Country Status (5)

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EP (1) EP0396789B1 (en)
AT (1) ATE84087T1 (en)
DE (1) DE58903181D1 (en)
ES (1) ES2036746T3 (en)
GR (2) GR920300096T1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0697484A1 (en) 1994-07-21 1996-02-21 Kämmerer Gmbh Release paper having a primer containing silicate

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19512663A1 (en) * 1995-04-05 1996-10-10 Kaemmerer Gmbh Release papers with pigment coats based on aluminum hydroxides
FI19992251A7 (en) * 1999-10-18 2001-04-19 Upm Kymmene Corp Method for providing a release coating, release material and backing material for the release material
FI116087B (en) * 2000-01-26 2005-09-15 Upm Kymmene Corp Base paper, process for its preparation and release paper

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE536477A (en) * 1954-03-15 1900-01-01

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0697484A1 (en) 1994-07-21 1996-02-21 Kämmerer Gmbh Release paper having a primer containing silicate
US5807781A (en) * 1994-07-21 1998-09-15 Kammerer Gmbh Release base paper having silicate-containing primer coats

Also Published As

Publication number Publication date
GR3007456T3 (en) 1993-07-30
EP0396789A1 (en) 1990-11-14
ES2036746T3 (en) 1993-06-01
DE58903181D1 (en) 1993-02-11
GR920300096T1 (en) 1993-02-17
ATE84087T1 (en) 1993-01-15

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