EP1152837A1 - Method for producing a coating of solvent-free adhesive systems on especially release-coated substrates - Google Patents

Method for producing a coating of solvent-free adhesive systems on especially release-coated substrates

Info

Publication number
EP1152837A1
EP1152837A1 EP00907535A EP00907535A EP1152837A1 EP 1152837 A1 EP1152837 A1 EP 1152837A1 EP 00907535 A EP00907535 A EP 00907535A EP 00907535 A EP00907535 A EP 00907535A EP 1152837 A1 EP1152837 A1 EP 1152837A1
Authority
EP
European Patent Office
Prior art keywords
roller
pressure
sensitive adhesive
adhesive
substrate
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.)
Granted
Application number
EP00907535A
Other languages
German (de)
French (fr)
Other versions
EP1152837B1 (en
Inventor
Lars Guldbrandsen
Ralf Hirsch
Dieter Müller
Hermann Neuhaus-Steinmetz
Stefan Schulz
Jörg SPEER
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.)
Tesa SE
Original Assignee
Beiersdorf AG
Tesa SE
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 Beiersdorf AG, Tesa SE filed Critical Beiersdorf AG
Publication of EP1152837A1 publication Critical patent/EP1152837A1/en
Application granted granted Critical
Publication of EP1152837B1 publication Critical patent/EP1152837B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/10—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an adhesive surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0813—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line characterised by means for supplying liquid or other fluent material to the roller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • B05D1/286—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers using a temporary backing to which the coating has been applied

Definitions

  • the invention is concerned with a method for producing a coating of solvent-free PSA systems on, in particular, release-coated substrates, the coating process running over a roller.
  • the pre-metered adhesive film is reduced in thickness, so that thin pressure-sensitive adhesive layers can be transferred to substrates.
  • a disadvantage of the known method is that pressure-sensitive layers from untreated smooth rollers can only be removed from substrates that are not coated with a release, or that the roller coated with the pressure-sensitive adhesive must have a release effect which can be produced via a fluorocarbon or tefion layer.
  • This release layer subsides over the course of its lifetime and is sensitive to external influences such as wear, dirt and mechanical damage.
  • release rollers made with fluorocarbon or Teflon coatings are not sufficiently releasable compared to acrylate hotmelt adhesives in the event of machine downtimes, so that a robust process without lengthy cleaning efforts of the coated roller combined with downtimes is not possible.
  • the anilox roller coating method with pre-dosed hot melt adhesives is also known from the prior art.
  • the disadvantage of the anilox roller method is that, depending on the type of hot melt adhesive, the structure of the anilox roller surface is drawn on the adhesive film when the adhesive layer is transferred to a substrate.
  • Another disadvantage of the anilox roller coating process is that at higher coating speeds it is not possible to completely empty the anilox structures, and this can result in an uneven application of adhesive. Furthermore, it is also difficult to remove the adhesive film with release-coated substrates from structured roller surfaces.
  • the object of the present invention is to provide a method for producing a solvent-free PSA coating, in particular on release-coated substrates, which avoids the disadvantages of the prior art.
  • the invention describes a method for producing a coating of solvent-free PSA systems on, in particular, release-coated substrates, a fluid film being applied to a rotating roller by means of a fluid applicator, and the PSA system being applied to the fluid film in one or more layers by means of an adhesive applicator, so that the fluid film is located between the roller and the pressure-sensitive adhesive system, and the substrate is led to the roller, so that the pressure-sensitive adhesive system is transferred from the roller to the substrate (release-coated and non-release-coated).
  • the substrate is brought in in particular via a second roller. Papers, foils, nonwovens and release-coated materials such as release papers, foils and the like are used as substrates.
  • the second roller also referred to as the contact roller, is preferably provided with a rubber coating and is preferably pressed against the roller with a line pressure of 50 to 500 N / mm, in particular with 100 to 200 N / mm.
  • the contact roller preferably has a Shore hardness (A) of 40-100, in particular a Shore hardness of 60-80 shore (A).
  • the substrate is preferably fed to the roller in such a way that the speed of the roller surface matches that of the substrate.
  • the substrate can also have a higher speed.
  • the roller is a steel roller, a chrome-plated steel roller, a rubber roller or a silicone rubber roller and / or the roller is made of elastic material. Furthermore, the roller can be smooth or have a slightly structured surface.
  • the smooth roller can preferably have a chrome layer.
  • the chrome-plated steel roller can optionally have a highly polished surface with a roughness depth of R 2 ⁇ +/- 1 ⁇ m.
  • the coating roller can, however, also be rubberized, preferably with a rubber hardness of 40 to 100 shore (A), in particular with a hardness of 60-80 shore (A).
  • the roller cover can be made of EPDM, Viton or silicone rubber or other elastic materials.
  • the roller can be tempered, preferably in a range from -10 ° C. to 200 ° C., very particularly preferably from 2 ° C. to 50 ° C.
  • the pressure-sensitive adhesive system is placed on the roller in particular with the aid of a mono- or multi-channel nozzle or a slot nozzle.
  • the roller loaded with fluid is preferably coated without contact with the adhesive film emerging from the nozzle.
  • the distance from the nozzle to the roller can preferably be 0 to 60 mm, in particular 1 to 10 mm.
  • the fluid applicator should also be temperature-controllable in order to bring agents contained in the adhesive formulation that are insensitive to the adhesive formulation to temperatures with the desired fluid properties.
  • the fluid can be wiped or applied, but it is also possible for the fluid to be brought onto the roller without contact, for example by spraying.
  • the pressure-sensitive adhesive film is crosslinked before the transfer to the substrate, in particular by means of electron beams, UV rays or a combination of the two methods.
  • Typical radiation devices which are used in the embodiment of the method according to the invention are linear cathode systems, scanner systems or multi-longitudinal cathode systems, provided that the accelerator is an electron beam.
  • the acceleration voltages are in the range between 40 kV and 350 kV, preferably 80 kV to 300 kV.
  • the dose rates range between 5 to 150 kGy, in particular 20 to 90 kGy.
  • two medium pressure mercury lamps with an output of 120 W / cm or one medium pressure mercury lamp with an output of 240 W / cm can be used as UV crosslinking systems.
  • 10 to 300 mJ / cm 2 are preferably set as doses.
  • the PSA film can be crosslinked thermally via the roller temperature of the coated roller, and the thermal crosslinking can also be used in addition.
  • the fluid film is preferably water and / or distilled water, optionally with additives such as alcohol, wetting agents and / or agents that are insensitive to adhesive formulations such as plasticizers or liquid anti-aging agents.
  • additives such as alcohol, wetting agents and / or agents that are insensitive to adhesive formulations such as plasticizers or liquid anti-aging agents.
  • the surface tension of the fluid should be less than the surface tension of the roller to be wetted.
  • Acrylic, natural rubber, synthetic rubber or EVA adhesives are used in particular as the pressure-sensitive adhesive system.
  • the acrylate hotmelts can furthermore be mixed with one or more additives such as anti-aging agents, crosslinking agents, light stabilizers, anti-ozone agents, fatty acids, resins, plasticizers and accelerators.
  • additives such as anti-aging agents, crosslinking agents, light stabilizers, anti-ozone agents, fatty acids, resins, plasticizers and accelerators.
  • fillers such as fibers, carbon black, zinc oxide, solid microbeads, silica, silicates and chalk, it also being possible to add non-blocking isocyanates.
  • rubbers can be added to improve the processability, thermoplastic elastomers in a weight fraction of 10 to 50 wt .-%, based on the total elastomer fraction.
  • SIS styrene-isoprene-styrene
  • SBS styrene-butadiene-styrene
  • All of the previously known adhesive resins described in the literature can be used as the tackifying resins to be added. Representative are the rosins, their disproportionated, hydrogenated, polymerized, esterified derivatives and salts, the aliphatic and aromatic hydrocarbon resins, terpene resins and terpene-phenolic resins. Any combination of these and other resins can be used to adjust the properties of the resulting adhesive as desired. Attention is drawn to the presentation of the state of knowledge in the "Handbook of Pressure Sensitive Adhesive Technology" by Donatas Satas (van Nostrand, 1989).
  • plasticizing substances known from adhesive tape technology can also be used as plasticizers to be added. These include, among others the paraffinic and naphthenic oils, (functionalized) oligomers such as oligobutadienes, isoprene, liquid nitrile rubbers, liquid terpene resins, vegetable and animal oils and fats, phthalates, functionalized acrylates.
  • paraffinic and naphthenic oils such as oligobutadienes, isoprene, liquid nitrile rubbers, liquid terpene resins, vegetable and animal oils and fats, phthalates, functionalized acrylates.
  • the nozzle (1) coats the hotmelt adhesive (11) on a roller (3), which can be designed as a smooth roller or a structured roller.
  • a roller (3) which can be designed as a smooth roller or a structured roller.
  • slot nozzles or multi-channel nozzles with, for example, three or more individual layers can also be used.
  • the roller (3) is designed as a chrome-plated steel roller with a highly polished surface, with a roughness depth R z ⁇ +/- 1 ⁇ m.
  • the fluid film (21) is preferably applied to the roller (3) in a pre-metered manner by means of a roller applicator (2) designed according to the prior art.
  • the roller (3) loaded with fluid (21) is coated with the adhesive film (11) emerging from the nozzle (1), preferably without contact.
  • the distance between the nozzle (1) and the roller (3) is 5 mm.
  • the adhesive film (11) floating on the roller (3) is then removed from the roller (3) with the aid of an application roller (6).
  • the contact roller (6) is provided with a rubber coating and is pressed against the roller (3) with a line pressure of 150 N / mm.
  • a release paper having release material is fed to the contact roller and the adhesive film (11) is thus transferred to the substrate (7).
  • an acrylic hot melt adhesive as described in DE 39 42 232 or DE 43 13 008, was used at a temperature of 90 ° C with the help of a mono nozzle (manufacturer Breyer), working width 350 mm, coated on a smooth roller.
  • the fluid wetting the smooth roller was water.
  • the temperature of the smooth roller was 20 ° C.
  • An adhesive film with a thickness of 20 g / m 2 was placed on the smooth roller and then removed from the roller with a corona-pretreated PET film (12 ⁇ m). The coating speed was 70 m / min. The uncovered adhesive side was then laminated with a release paper. The amount of fluid present on the uncovered adhesive side was so small that the subsequent lamination with release paper did not cause any damage to the free adhesive side.
  • the composite produced in this way was coated a second time on the free film side and rolled up.
  • the acrylate hotmelt adhesive mentioned in Example 1 was coated under the conditions mentioned in Example 1 in a layer thickness of 130 g / m 2 onto a smooth roller.
  • the decreasing substrate in this case was a silicone release paper with a release value of 5 - 25 cN / cm.
  • the fluid on the open adhesive side was dried by means of IR rays shortly before being rolled up.
  • Example 4 The acrylate hotmelt adhesive mentioned in Example 1 was removed under the conditions mentioned in Example 2 in a layer thickness of 50 g / m 2 against a release-coated PETP film with a release value of 5-9 cN / cm and rolled up.
  • Example 4
  • a natural rubber hot melt adhesive was coated onto the smooth roller at a temperature of 120 ° C. using the nozzle.
  • a water / alcohol mixture was used as the fluid.
  • the transfer took place on a creped paper, which was equipped with an impregnation, a primer and a release in an upstream operation.
  • a three-layer, self-adhesive product structure was extruded onto a smooth roller.
  • the hotmelt adhesive the type described in Example 1 was extruded onto the top and bottom of a rubber-elastic middle layer support using the multi-channel die.
  • This self-adhesive composite was placed on the smooth roller covered with water and transferred against a release paper with separation forces of 5 to 30 cN / cm and rolled up.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Adhesive Tapes (AREA)

Abstract

The invention relates to a method for producing a coating of solvent-free adhesive systems on especially release-coated substrates. According to the inventive method, a fluid film is applied onto a rotating roller (3) using a fluid application device (2). The adhesive system (11) is applied onto said fluid film in one or more layers using an adhesive application device (1). The substrate (7) is contacted with the roller (6) so that the adhesive system (11) is transferred from the roller (3) to the substrate (7).

Description

Beschreibung description
Verfahren zur Herstellung einer Beschichtung von lösungsmittelfreien Haftklebesystemen auf insbesondere releasebeschichteten SubstratenProcess for producing a coating of solvent-free PSA systems, in particular on release-coated substrates
Die Erfindung beschäftigt sich mit einem Verfahren zur Herstellung einer Beschichtung von lösungsmittelfreien Haftklebesystemen auf insbesondere releasebeschichteten Substraten, wobei der Vorgang der Beschichtung über eine Walze läuft.The invention is concerned with a method for producing a coating of solvent-free PSA systems on, in particular, release-coated substrates, the coating process running over a roller.
Aus der EP 0 622 127 B1 ist bekannt, daß über eine Walze druckempfindliche, lösungsmittelfreie Klebstoffschichten auf ein Substrat aufgelegt werden. Als Auftragswerk kommen Ein- oder Mehrkanaldüsen zum Einsatz.It is known from EP 0 622 127 B1 that pressure-sensitive, solvent-free adhesive layers are placed on a substrate by means of a roller. Single or multi-channel nozzles are used as the application.
Hervorgerufen durch eine angelegte Differenzgeschwindigkeit zwischen der beschichteten Walze oder dem abnehmenden Substrat wird der vordosierte Klebstoffilm in seiner Dicke reduziert, so daß dünne Haftklebeschichten auf Substrate transferiert werden können.Caused by an applied differential speed between the coated roller or the decreasing substrate, the pre-metered adhesive film is reduced in thickness, so that thin pressure-sensitive adhesive layers can be transferred to substrates.
Nachteilig ist dem bekannten Verfahren, daß haftklebrige Schichten von unbehandelten Glattwalzen nur gegen nicht releasebeschichtete Substrate abgenommen werden können beziehungsweise die mit dem Haftkleber beschichtete Walze einen Releaseeffekt aufweisen muß, der über eine Fluorcarbon- oder Tefionschicht hergestellt werden kann. Diese Releaseschicht läßt im Laufe ihrer Lebenszeit nach und ist empfindlich gegen äußere Einflüsse wie Abnutzung, Schmutz und mechanische Beschädigungen. Des weiteren sind Releasewalzen, hergestellt mit Fluorcarbon oder Teflonüberzügen, gegenüber Acrylathaftschmelzklebstoffen im Falle von Maschinenstillständen nicht ausreichend releasefähig, so daß ein robuster Prozeß ohne langwierige Reinigungsaufwendungen der beschichteten Walze verbunden mit Stillstandzeiten nicht gegeben ist. Nach dem Stand der Technik ist ebenfalls das Rasterwalzenbeschichtungsverfahren mit über einer Düse vordosierten Heißschmelzklebstoffen bekannt.A disadvantage of the known method is that pressure-sensitive layers from untreated smooth rollers can only be removed from substrates that are not coated with a release, or that the roller coated with the pressure-sensitive adhesive must have a release effect which can be produced via a fluorocarbon or tefion layer. This release layer subsides over the course of its lifetime and is sensitive to external influences such as wear, dirt and mechanical damage. Furthermore, release rollers made with fluorocarbon or Teflon coatings are not sufficiently releasable compared to acrylate hotmelt adhesives in the event of machine downtimes, so that a robust process without lengthy cleaning efforts of the coated roller combined with downtimes is not possible. The anilox roller coating method with pre-dosed hot melt adhesives is also known from the prior art.
Der Nachteil des Rasterwalzenverfahrens besteht jedoch darin, daß je nach Schmelz- klebstofftyp beim Übertragen der Klebstoffschicht auf ein Substrat die Struktur der Rasterwalzenoberfläche auf dem Klebstoffilm abgezeichnet ist. Ein weiterer Nachteil des Rasterwalzenbeschichtungsverfahrens besteht darin, daß bei höheren Beschichtungs- geschwindigkeiten ein vollständiges Entleeren der Rasterstrukturen nicht möglich ist und es somit zu einem ungleichmäßigen Klebstoffauftrag kommen kann. Des weiteren ist ein Abnehmen des Klebstoffilms mit releasebeschichteten Substraten von strukturierten Walzenoberflächen ebenfalls nur schwer möglich.However, the disadvantage of the anilox roller method is that, depending on the type of hot melt adhesive, the structure of the anilox roller surface is drawn on the adhesive film when the adhesive layer is transferred to a substrate. Another disadvantage of the anilox roller coating process is that at higher coating speeds it is not possible to completely empty the anilox structures, and this can result in an uneven application of adhesive. Furthermore, it is also difficult to remove the adhesive film with release-coated substrates from structured roller surfaces.
Aufgabe der vorliegenden Erfindung ist es, ein Verfahren zur Herstellung einer lösemittelfreien Haftklebebeschichtung auf insbesondere releasebeschichteten Substraten zur Verfügung zu stellen, das die Nachteile des Standes der Technik vermeidet.The object of the present invention is to provide a method for producing a solvent-free PSA coating, in particular on release-coated substrates, which avoids the disadvantages of the prior art.
Gelöst wird diese Aufgabe durch ein Verfahren, wie es im Hauptanspruch niedergelegt ist. Vorteilhafte Ausführungsformen des Verfahrens sind Gegenstand der Unteransprüche.This problem is solved by a method as set out in the main claim. Advantageous embodiments of the method are the subject of the dependent claims.
Demgemäß beschreibt die Erfindung ein Verfahren zur Herstellung einer Beschichtung von lösungsmittelfreien Haftklebesystemen auf insbesondere releasebeschichtete Substrate, wobei auf eine rotierende Walze mittels eines Fluidauftragswerk ein Fluidfilm aufgetragen wird, auf den Fluidfilm das Haftklebesystem in einer oder mehreren Lagen mittels eines Klebstoffauftragswerks aufgebracht wird, so daß sich der Fluidfilm zwischen Walze und Haftklebesystem befindet, und an die Walze das Substrat herangeführt wird, so daß das Haftklebesystem von der Walze auf das Substrat (releasebeschichtete und nicht releasebeschichtete) transferiert wird.Accordingly, the invention describes a method for producing a coating of solvent-free PSA systems on, in particular, release-coated substrates, a fluid film being applied to a rotating roller by means of a fluid applicator, and the PSA system being applied to the fluid film in one or more layers by means of an adhesive applicator, so that the fluid film is located between the roller and the pressure-sensitive adhesive system, and the substrate is led to the roller, so that the pressure-sensitive adhesive system is transferred from the roller to the substrate (release-coated and non-release-coated).
Das Heranführen des Substrats geschieht insbesondere über eine zweite Walze. Als Substrate finden Papiere, Folien, Non-Wovens und releasebeschichtete Materialien wie Trennpapiere, Folien und dergleichen Verwendung. Die zweite Walze, auch als Anlegewalze bezeichnet, ist vorzugsweise mit einem Gummiüberzug versehen und wird vorzugsweise mit einem Liniendruck von 50 bis 500 N/mm, insbesondere mit 100 bis 200 N/mm an die Walze angepreßt. Die Anlegewalze hat vorzugsweise eine Shore-Härte (A) von 40 - 100, insbesondere eine Shore-Härte von 60 - 80 shore (A).The substrate is brought in in particular via a second roller. Papers, foils, nonwovens and release-coated materials such as release papers, foils and the like are used as substrates. The second roller, also referred to as the contact roller, is preferably provided with a rubber coating and is preferably pressed against the roller with a line pressure of 50 to 500 N / mm, in particular with 100 to 200 N / mm. The contact roller preferably has a Shore hardness (A) of 40-100, in particular a Shore hardness of 60-80 shore (A).
Das Substrat wird bevorzugt so an die Walze angeführt, daß die Geschwindigkeit der Walzenoberfläche mit der des Substrats übereinstimmt. Sollte jedoch mit der Abnahme des Klebstoffilms eine Dickenverringerung angestrebt werden, kann das Substrat auch eine höhere Geschwindigkeit aufweisen.The substrate is preferably fed to the roller in such a way that the speed of the roller surface matches that of the substrate. However, if the aim is to reduce the thickness of the adhesive film, the substrate can also have a higher speed.
In einer ersten vorteilhaften Ausführungsform ist die Walze eine Stahlwalze, eine verchromte Stahlwalze, eine Gummiwalze oder eine Silikongummiwalze und/oder ist die Walze aus elastischem Material gefertigt. Des weiteren kann die Walze glatt oder eine gering strukturierte Oberfläche aufweisen.In a first advantageous embodiment, the roller is a steel roller, a chrome-plated steel roller, a rubber roller or a silicone rubber roller and / or the roller is made of elastic material. Furthermore, the roller can be smooth or have a slightly structured surface.
Die Glattwalze kann vorzugsweise eine Chromschicht aufweisen. Optional kann die verchromte Stahlwalze eine hochglanzpolierte Oberfläche besitzen mit einer Rauhtiefe R2 < +/- 1 μm.The smooth roller can preferably have a chrome layer. The chrome-plated steel roller can optionally have a highly polished surface with a roughness depth of R 2 <+/- 1 μm.
Die Beschichtungswalze kann aber auch gummiert sein, vorzugsweise mit einer Gummihärte von 40 bis 100 shore (A), insbesondere mit einer Härte von 60 - 80 shore (A). Der Walzenbezug kann gemäß dem Stand der Technik aus EPDM, Viton oder Silikongummi oder anderen elastischen Materialien bestehen.The coating roller can, however, also be rubberized, preferably with a rubber hardness of 40 to 100 shore (A), in particular with a hardness of 60-80 shore (A). According to the state of the art, the roller cover can be made of EPDM, Viton or silicone rubber or other elastic materials.
Weiterhin als vorteilhaft hat sich erwiesen, wenn die Walze temperierbar ist, und zwar bevorzugt in einem Bereich von -10 °C bis 200 °C, ganz besonders bevorzugt von 2 °C bis 50 °C.It has also proven to be advantageous if the roller can be tempered, preferably in a range from -10 ° C. to 200 ° C., very particularly preferably from 2 ° C. to 50 ° C.
Das Auflegen des Haftklebesystems auf die Walze erfolgt insbesondere mit Hilfe einer Mono- oder Mehrkanaldüse oder einer Schlitzdüse.The pressure-sensitive adhesive system is placed on the roller in particular with the aid of a mono- or multi-channel nozzle or a slot nozzle.
Die mit Fluid beaufschlagte Walze wird mit dem aus der Düse austretenden Klebstoffilm vorzugsweise berührungsfrei beschichtet. Der Abstand der Düse zur Walze kann vorzugsweise 0 bis 60 mm betragen, insbesondere 1 bis 10 mm.The roller loaded with fluid is preferably coated without contact with the adhesive film emerging from the nozzle. The distance from the nozzle to the roller can preferably be 0 to 60 mm, in particular 1 to 10 mm.
Das Fluidauftragswerk sollte des weiteren noch temperierbar sein, um in der Klebstoffrezeptur enthaltene, klebstoffrezepturunempfindliche Agenzien auf Temperaturen mit gewünschten Fluideigenschaften zu bringen. Das Fluid kann dabei angewischt oder angetragen werden, es ist aber auch möglich, daß das Fluid berührungslos auf die Walze gebracht wird, zum Beispiel durch Aufsprühen.The fluid applicator should also be temperature-controllable in order to bring agents contained in the adhesive formulation that are insensitive to the adhesive formulation to temperatures with the desired fluid properties. The fluid can be wiped or applied, but it is also possible for the fluid to be brought onto the roller without contact, for example by spraying.
In einer weiteren vorteilhaften Ausführungsform der Erfindung wird der Haftklebefilm vor der Transferierung auf das Substrat vernetzt wird, insbesondere mittels Elektronenstrahlen, UV-Strahlen oder einer Kombination der beiden Verfahren.In a further advantageous embodiment of the invention, the pressure-sensitive adhesive film is crosslinked before the transfer to the substrate, in particular by means of electron beams, UV rays or a combination of the two methods.
Typische Bestrahlungsvorrichtungen, die bei der erfindungsgemäßen Ausgestaltung des Verfahrens zum Einsatz kommen, stellen Linearkathodensysteme, Scannersysteme beziehungsweise Multilängskathodensysteme dar, sofern es sich um Elektronenstrahl- beschleunigem handelt.Typical radiation devices which are used in the embodiment of the method according to the invention are linear cathode systems, scanner systems or multi-longitudinal cathode systems, provided that the accelerator is an electron beam.
Die Beschleunigungsspannungen liegen im Bereich zwischen 40 kV und 350 kV, vorzugsweise 80 kV bis 300 kV. Die Dosisleistungen bewegen zwischen 5 bis 150 kGy, insbesondere 20 bis 90 kGy.The acceleration voltages are in the range between 40 kV and 350 kV, preferably 80 kV to 300 kV. The dose rates range between 5 to 150 kGy, in particular 20 to 90 kGy.
Als UV-Vernetzungsanlagen können insbesondere zwei Quecksilbermitteldruckstrahler mit jeweils einer Leistung von 120 W/cm beziehungsweise ein Quecksilbermitteldruckstrahler mit einer Leistung von 240 W/cm zum Einsatz kommen. Als Dosen werden bevorzugt 10 bis 300 mJ/cm2 eingestellt.In particular, two medium pressure mercury lamps with an output of 120 W / cm or one medium pressure mercury lamp with an output of 240 W / cm can be used as UV crosslinking systems. 10 to 300 mJ / cm 2 are preferably set as doses.
Die Vernetzung des Haftklebefilms kann thermisch über die Walzentemperatur der beschichteten Walze erfolgen, wobei die thermische Vernetzung auch ergänzend eingesetzt werden kann.The PSA film can be crosslinked thermally via the roller temperature of the coated roller, and the thermal crosslinking can also be used in addition.
Der Fluidfilm ist vorzugsweise Wasser und/oder destilliertes Wasser, gegebenenfalls mit Zusätzen wie Alkohol, Benetzungsmitteln und/oder klebstoffrezepturunempfindliche Agenzien wie Weichmachern oder flüssigen Alterungsschutzmitteln Zur Erreichung einer gleichmäßigen Benetzung sollte die Oberflächenspannung des Flui- des kleiner sein als die Oberflächenspannung der zu benetzenden Walze.The fluid film is preferably water and / or distilled water, optionally with additives such as alcohol, wetting agents and / or agents that are insensitive to adhesive formulations such as plasticizers or liquid anti-aging agents. In order to achieve uniform wetting, the surface tension of the fluid should be less than the surface tension of the roller to be wetted.
Als Haftklebesystem werden insbesondere eingesetzt Acrylat-, Naturkautschuk-, Synthesekautschuk- oder EVA-Kleber.Acrylic, natural rubber, synthetic rubber or EVA adhesives are used in particular as the pressure-sensitive adhesive system.
Beispielsweise kommen als niedermolekulare Acrylathotmelts Copolymerisate aus (Meth)acryisäure und deren Estern mit 1 bis 25 C-Atomen, Malein-, Fumar- und/oder Itaconsäure und/oder deren Estern, substituierten (Meth)acrylamiden, Maleinsäureanhy- drid und anderen Vinylverbindungen, wie Vinylestem, insbesondere Vinylacetat, Vinyl- alkoholen und/oder Vinylethem zum Einsatz.For example, copolymers of (meth) acrylic acid and their esters with 1 to 25 carbon atoms, maleic, fumaric and / or itaconic acid and / or their esters, substituted (meth) acrylamides, maleic acid anhy. drid and other vinyl compounds, such as vinyl esters, in particular vinyl acetate, vinyl alcohols and / or vinyl ethers.
Die Acrylathotmelts können des weiteren mit einem oder mehreren Additiven wie Alterungsschutzmitteln, Vernetzern, Lichtschutzmitteln, Ozonschutzmitteln, Fettsäuren, Harzen, Weichmachern und Beschleunigern abgemischt sein.The acrylate hotmelts can furthermore be mixed with one or more additives such as anti-aging agents, crosslinking agents, light stabilizers, anti-ozone agents, fatty acids, resins, plasticizers and accelerators.
Weiterhin können sie mit einem oder mehreren Füllstoffen wie Fasern, Ruß, Zinkoxid, Mikrovollkugeln, Kieselsäure, Silikaten und Kreide gefüllt sein, wobei auch der Zusatz von blockierungsfreien Isocyanaten möglich ist.Furthermore, they can be filled with one or more fillers such as fibers, carbon black, zinc oxide, solid microbeads, silica, silicates and chalk, it also being possible to add non-blocking isocyanates.
Bei Kautschuk/Synthesekautschuk als Ausgangsmaterial für den Kleber sind weite Variationsmöglichkeiten gegeben, sei er aus der Gruppe der Naturkautschuke oder der Synthesekautschuke oder sei er aus einem beliebigen Blend aus Naturkautschuken und/oder Synthesekautschuken, wobei der Naturkautschuk oder die Naturkautschuke grundsätzlich aus allen erhältlichen Qualitäten wie zum Beispiel Crepe-, RSS-, ADS-, TSR- oder CV-Typen, je nach benötigtem Reinheits- und Viskositätsniveau, und der Synthesekautschuk oder die Synthesekautschuke aus der Gruppe der statistisch copolymerisierten Styrol-Butadien-Kautschuke (SBR), der Butadien-Kautschuke (BR), der synthetischen Polyisoprene (IR), der Butyl-Kautschuke (IIR), der halogenierten Butyl-Kautschuke (XIIR), der Acrylatkautschuke (ACM), der Etylen-Vinylacetat-Copolymeren (EVA) und der Polyurethane und/oder deren Blends gewählt werden können.When it comes to rubber / synthetic rubber as a starting material for the adhesive, there are wide variations, be it from the group of natural rubbers or synthetic rubbers or from any blend of natural rubbers and / or synthetic rubbers, whereby natural rubber or natural rubbers are basically of all available qualities such as for example crepe, RSS, ADS, TSR or CV types, depending on the required level of purity and viscosity, and the synthetic rubber or the synthetic rubbers from the group of randomly copolymerized styrene-butadiene rubbers (SBR), the butadiene Rubbers (BR), synthetic polyisoprenes (IR), butyl rubbers (IIR), halogenated butyl rubbers (XIIR), acrylate rubbers (ACM), ethylene-vinyl acetate copolymers (EVA) and polyurethanes and / or whose blends can be selected.
Weiterhin vorzugsweise können Kautschuken zur Verbesserung der Verarbeitbarkeit thermoplastische Elastomere mit einem Gewichtsanteil von 10 bis 50 Gew.-% zugesetzt werden, und zwar bezogen auf den Gesamtelastomeranteil.Further preferably, rubbers can be added to improve the processability, thermoplastic elastomers in a weight fraction of 10 to 50 wt .-%, based on the total elastomer fraction.
Stellvertretend genannt seien an dieser Stelle vor allem die besonders verträglichen Sty- rol-lsopren-Styrol- (SIS) und Styrol-Butadien-Styrol (SBS) -Typen. Als zuzusetzende klebrigmachende Harze sind ausnahmslos alle vorbekannten und in der Literatur beschriebenen Klebharze einsetzbar. Genannt seien stellvertretend die Kolophoniumharze, deren disproportionierte, hydrierte, polymerisierte, veresterte Derivate und Salze, die aliphatischen und aromatischen Kohlenwasserstoffharze, Terpenharze und Terpenphenolharze. Beliebige Kombinationen dieser und weiterer Harze können eingesetzt werden, um die Eigenschaften der resultierenden Klebmasse wunschgemäß einzustellen. Auf die Darstellung des Wissensstandes im „Handbook of Pressure Sensitive Adhesive Technology" von Donatas Satas (van Nostrand, 1989) sei ausdrücklich hingewiesen.The particularly compatible types of styrene-isoprene-styrene (SIS) and styrene-butadiene-styrene (SBS) are particularly worth mentioning here. All of the previously known adhesive resins described in the literature can be used as the tackifying resins to be added. Representative are the rosins, their disproportionated, hydrogenated, polymerized, esterified derivatives and salts, the aliphatic and aromatic hydrocarbon resins, terpene resins and terpene-phenolic resins. Any combination of these and other resins can be used to adjust the properties of the resulting adhesive as desired. Attention is drawn to the presentation of the state of knowledge in the "Handbook of Pressure Sensitive Adhesive Technology" by Donatas Satas (van Nostrand, 1989).
Als ebenfalls zuzusetzende Weichmacher können alle aus der Klebebandtechnologie bekannten weichmachenden Substanzen eingesetzt werden. Dazu zählen unter anderem die paraffinischen und naphthenischen Öle, (funktionalisierte) Oligomere wie Oligobuta- diene, -isoprene, flüssige Nitrilkautschuke, flüssige Terpenharze, pflanzliche und tierische Öle und Fette, Phthalate, funktionalisierte Acrylate.All plasticizing substances known from adhesive tape technology can also be used as plasticizers to be added. These include, among others the paraffinic and naphthenic oils, (functionalized) oligomers such as oligobutadienes, isoprene, liquid nitrile rubbers, liquid terpene resins, vegetable and animal oils and fats, phthalates, functionalized acrylates.
Im folgenden soll anhand einer Figur sowie mehrerer Beispiele die Erfindung näher dargelegt, ohne damit diese aber unnötig einschränken zu wollen.The invention is to be explained in more detail below with the aid of a figure and several examples, but without wishing to restrict it unnecessarily.
In der Figur 1 ist eine vorteilhafte Ausführungsform des Verfahrens gezeigt. Die Düse (1 ) beschichtet den Haftschmelzklebstoff (11 ) auf eine Walze (3), die als Glattwalze oder eine strukturierte Walze ausgeführt sein kann. Neben dem Einsatz der hier gezeigten Monodüse (1) können auch Schlitzdüsen oder Mehrkanaldüsen mit zum Beispiel drei oder mehreren Einzelschichten eingesetzt werden.An advantageous embodiment of the method is shown in FIG. The nozzle (1) coats the hotmelt adhesive (11) on a roller (3), which can be designed as a smooth roller or a structured roller. In addition to the use of the mono nozzle (1) shown here, slot nozzles or multi-channel nozzles with, for example, three or more individual layers can also be used.
Die Walze (3) ist als verchromte Stahlwalze mit einer hochglanzpolierten Oberfläche ausgeführt, und zwar mit einer Rauhtiefe Rz < +/-1 μm.The roller (3) is designed as a chrome-plated steel roller with a highly polished surface, with a roughness depth R z <+/- 1 μm.
Der Fluidfilm (21 ) wird vorzugsweise über ein gemäß dem Stand der Technik ausgeführtes Walzenauftragswerk (2) gleichmäßig über die Beschichtungsbreite an die Walze (3) vordosiert angetragen. Die mit Fluid (21 ) beaufschlagte Walze (3) wird mit dem aus der Düse (1 ) austretenden Klebstoffilm (11 ) vorzugsweise berührungsfrei beschichtet. Der Abstand der Düse (1) zur Walze (3) beträgt 5 mm.The fluid film (21) is preferably applied to the roller (3) in a pre-metered manner by means of a roller applicator (2) designed according to the prior art. The roller (3) loaded with fluid (21) is coated with the adhesive film (11) emerging from the nozzle (1), preferably without contact. The distance between the nozzle (1) and the roller (3) is 5 mm.
Der auf die Walze (3) schwimmend aufgelegte Klebstoffilm (11) wird anschließend mit Hilfe einer Anlegewalze (6) von der Walze (3) abgenommen. Die Anlegewalze (6) ist mit einem Gummiüberzug versehen und wird mit einem Liniendruck von 150 N/mm an die Walze (3) angepreßt.The adhesive film (11) floating on the roller (3) is then removed from the roller (3) with the aid of an application roller (6). The contact roller (6) is provided with a rubber coating and is pressed against the roller (3) with a line pressure of 150 N / mm.
Als den Haftklebstoffilm abnehmendes Substrat (7) wird ein releaseaufweisendes Trennpapiere der Anlegewalze zugeführt und der Klebstoffilm (11 ) somit auf das Substrat (7) übertragen.As the substrate (7) which removes the pressure-sensitive adhesive film, a release paper having release material is fed to the contact roller and the adhesive film (11) is thus transferred to the substrate (7).
Zum besseren Verständnis der Erfindung dienen folgende Beispiele: Beispiel 1The following examples serve to better understand the invention: example 1
Mit Hilfe eines Einschneckenextruders (L/D:27) wurde ein Acrylathaftschmelzklebstoff, wie in der DE 39 42 232 oder der DE 43 13 008 beschrieben, bei einer Temperatur von 90° C mit Hilfe einer Monodüse (Fabrikat Breyer), Arbeitsbreite 350 mm, auf eine Glattwalze beschichtet. Das Fluid, welches die Glattwalze benetzte, war Wasser. Die Temperatur der Glattwalze betrug 20 °C.With the help of a single-screw extruder (L / D: 27) an acrylic hot melt adhesive, as described in DE 39 42 232 or DE 43 13 008, was used at a temperature of 90 ° C with the help of a mono nozzle (manufacturer Breyer), working width 350 mm, coated on a smooth roller. The fluid wetting the smooth roller was water. The temperature of the smooth roller was 20 ° C.
Es wurde ein Klebstoffilm mit einer Dicke von 20 g/m2 auf die Glattwalze gelegt und anschließend mit einer Corona vorbehandelten PET-Folie (12 μm) von der Walze abgenommen. Die Beschichtungsgeschwindigkeit betrug 70 m/min. Anschließend wurde die nicht abgedeckte Klebstoffseite mit einem Trennpapier kaschiert. Die auf der nicht abgedeckten Klebstoffseite vorhandene Fluidmenge war so gering, daß die anschließende Kaschierung mit Trennpapier keinerlei Beschädigung der freien Klebstoffseite hervorrief.An adhesive film with a thickness of 20 g / m 2 was placed on the smooth roller and then removed from the roller with a corona-pretreated PET film (12 μm). The coating speed was 70 m / min. The uncovered adhesive side was then laminated with a release paper. The amount of fluid present on the uncovered adhesive side was so small that the subsequent lamination with release paper did not cause any damage to the free adhesive side.
Der so hergestellte Verbund wurde ein zweites Mal auf die freie Folienseite beschichtet und aufgerollt.The composite produced in this way was coated a second time on the free film side and rolled up.
Beispiel 2Example 2
Der in Beispiel 1 erwähnte Acrylathaftschmelzklebstoff wurde unter den im Beispiel 1 genannten Bedingungen in einer Schichtdicke von 130 g/m2 auf eine Glattwalze beschichtet. Das abnehmende Substrat war in diesem Fall ein Silikontrennpapier mit einem Releasewert von 5 - 25 cN/cm. Das auf der offenen Klebstoffseite vorhandene Fluid wurde mittels IR-Strahlen kurz vor der Aufrollung getrocknet.The acrylate hotmelt adhesive mentioned in Example 1 was coated under the conditions mentioned in Example 1 in a layer thickness of 130 g / m 2 onto a smooth roller. The decreasing substrate in this case was a silicone release paper with a release value of 5 - 25 cN / cm. The fluid on the open adhesive side was dried by means of IR rays shortly before being rolled up.
Beispiel 3Example 3
Der in Beispiel 1 erwähnte Acrylathaftschmelzklebstoff wurde unter den in Beispiel 2 genannten Bedingungen in einer Schichtdicke von 50 g/m2 gegen eine beidseitig releasebeschichtete PETP-Folie mit einem Releasewert von 5 - 9 cN/cm abgenommen und aufgerollt. Beispiel 4The acrylate hotmelt adhesive mentioned in Example 1 was removed under the conditions mentioned in Example 2 in a layer thickness of 50 g / m 2 against a release-coated PETP film with a release value of 5-9 cN / cm and rolled up. Example 4
Ein Naturkautschukhotmeltklebstoff wurde bei einer Temperatur von 120 °C mit Hilfe der Düse auf die Glattwalze beschichtet. Als Fluid kam ein Wasser/Alkoholgemisch zum Einsatz. Die Transferierung erfolgte auf ein gekrepptes Papier, welches mit einer Imprägnierung, einem Primer und einem Release in einem vorgeschalteten Arbeitsgang ausgerüstet wurde.A natural rubber hot melt adhesive was coated onto the smooth roller at a temperature of 120 ° C. using the nozzle. A water / alcohol mixture was used as the fluid. The transfer took place on a creped paper, which was equipped with an impregnation, a primer and a release in an upstream operation.
Beispiel 5Example 5
Mit Hilfe einer Mehrkanaldüse wurde ein dreilagiger, beidseitig selbstklebender Produktaufbau auf eine Glattwalze extrudiert. Als Haftschmelzklebstoff wurde der in Beispiel 1 beschriebene Typ auf die Ober- und Unterseite eines gummielastischen Mittelschichtträgers mit Hilfe der Mehrkanaldüse extrudiert. Dieser selbstklebende Verbund wurde auf die mit Wasser belegte Glattwalze aufgelegt und gegen ein Trennpapier mit Trennkräften von 5 - 30 cN/cm transferiert und aufgerollt. With the help of a multi-channel nozzle, a three-layer, self-adhesive product structure was extruded onto a smooth roller. As the hotmelt adhesive, the type described in Example 1 was extruded onto the top and bottom of a rubber-elastic middle layer support using the multi-channel die. This self-adhesive composite was placed on the smooth roller covered with water and transferred against a release paper with separation forces of 5 to 30 cN / cm and rolled up.

Claims

Patentansprüche claims
1. Verfahren zur Herstellung einer Beschichtung von lösungsmittelfreien Haftklebesystemen auf insbesondere releasebeschichtete Substrate, wobei auf eine rotierende Walze mittels eines Fluidauftragswerks ein Fluidfilm aufgetragen wird, auf den Fluidfilm das Haftklebesystem in einer oder mehreren Lagen mittels eines1. A method for producing a coating of solvent-free pressure-sensitive adhesive systems on, in particular, release-coated substrates, a fluid film being applied to a rotating roller by means of a fluid applicator, and the pressure-sensitive adhesive system in one or more layers by means of a
Klebstoffauftragswerks aufgebracht wird, an die Walze das Substrat herangeführt wird, so daß das Haftklebesystem von derAdhesive applicator is applied to the roller, the substrate is brought so that the pressure sensitive adhesive system of the
Walze auf das Substrat transferiert wird.Roll is transferred to the substrate.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß die Walze eine Stahlwalze, eine verchromte Stahlwalze, eine Gummiwalze oder eine Silikongummiwalze ist und/oder daß die Walze aus elastischem Material gefertigt ist.2. The method according to claim 1, characterized in that the roller is a steel roller, a chrome-plated steel roller, a rubber roller or a silicone rubber roller and / or that the roller is made of elastic material.
3. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß die Walze temperierbar ist bevorzugt in einem Bereich von -10 °C bis 200 °C, ganz besonders bevorzugt von 2 °C bis 50 °C.3. The method according to claim 1, characterized in that the roller can be tempered preferably in a range from -10 ° C to 200 ° C, very particularly preferably from 2 ° C to 50 ° C.
4. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß das Auflegen des Haftklebesystems auf die Walze mit Hilfe einer Mono- oder Mehrkanaldüse oder einer Schlitzdüse erfolgt4. The method according to claim 1, characterized in that the application of the pressure-sensitive adhesive system to the roller takes place with the aid of a mono- or multi-channel nozzle or a slot nozzle
5. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß das Fluidauftragswerk temperierbar ist5. The method according to claim 1, characterized in that the fluid applicator is heatable
6. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß der Haftklebefilm vor der Transferierung auf das Substrat vernetzt wird, insbesondere mittels Elektronenstrahlen, UV-Strahlen oder einer Kombination der beiden und/oder thermisch.6. The method according to claim 1, characterized in that the pressure-sensitive adhesive film is crosslinked before the transfer to the substrate, in particular by means of electron beams, UV rays or a combination of the two and / or thermally.
7. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß als Haftklebesystem eingesetzt werden Acrylat-, Naturkautschuk-, Synthesekautschuk- oder EVA-Kleber.7. The method according to claim 1, characterized in that acrylate, natural rubber, synthetic rubber or EVA adhesive are used as the pressure-sensitive adhesive system.
8. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß der Fluidfilm besteht aus Wasser und/oder destilliertem Wasser, gegebenenfalls mit Zusätzen wie Alkohol, Benetzungsmitteln und/oder klebstoffrezepturunempfindlichen Agenzien wie Weichmachern oder flüssigen Alterungsschutzmitteln. 8. The method according to claim 1, characterized in that the fluid film consists of water and / or distilled water, optionally with additives such as alcohol, wetting agents and / or agents not sensitive to adhesive formulations, such as plasticizers or liquid anti-aging agents.
EP00907535A 1999-02-12 2000-02-10 Method for producing a coating of solvent-free adhesive systems on especially release-coated substrates Expired - Lifetime EP1152837B1 (en)

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DE19905935 1999-02-12
DE19905935A DE19905935A1 (en) 1999-02-12 1999-02-12 Process for producing a coating of solvent-free PSA systems, in particular on release-coated substrates
PCT/EP2000/001062 WO2000047336A1 (en) 1999-02-12 2000-02-10 Method for producing a coating of solvent-free adhesive systems on especially release-coated substrates

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