WO2007079913A1 - Pellicule de protection a structures superficielles fines pour eviter la formation de bulles d'air lors de l'application de produits adhesifs - Google Patents

Pellicule de protection a structures superficielles fines pour eviter la formation de bulles d'air lors de l'application de produits adhesifs Download PDF

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Publication number
WO2007079913A1
WO2007079913A1 PCT/EP2006/012178 EP2006012178W WO2007079913A1 WO 2007079913 A1 WO2007079913 A1 WO 2007079913A1 EP 2006012178 W EP2006012178 W EP 2006012178W WO 2007079913 A1 WO2007079913 A1 WO 2007079913A1
Authority
WO
WIPO (PCT)
Prior art keywords
adhesive
cover
adhesive layer
structures
raised
Prior art date
Application number
PCT/EP2006/012178
Other languages
German (de)
English (en)
Inventor
Hansjörg Ander
Rolf Becher
Thomas Fogel
Margret Haag
Ulrich Neitzert
Heinz Josef RÖSER
Michael SCHÜRMANN
Cornelia Sundrum
Original Assignee
Lohmann Gmbh & Co. Kg
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 Lohmann Gmbh & Co. Kg filed Critical Lohmann Gmbh & Co. Kg
Publication of WO2007079913A1 publication Critical patent/WO2007079913A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/40—Adhesives in the form of films or foils characterised by release liners
    • C09J7/403—Adhesives in the form of films or foils characterised by release liners characterised by the structure of the release feature

Definitions

  • the invention relates to a cover for covering adhesive products, such as adhesive tapes or adhesive films, which has fine surface structures, by means of which the tendency to form air bubbles when applying the adhesive tapes or adhesive films to substrate surfaces can be reduced.
  • the invention further relates to the use of such covers for covering adhesive products such as adhesive tapes or adhesive films, as well as adhesive products which are covered with the covers according to the invention, and to processes for the production of the coverings and adhesive products according to the invention.
  • Adhesive products such as adhesive tapes or adhesive films, which are generally composed of a carrier layer and an adhesive layer coated thereon, are used in a wide variety of applications for joining or joining objects, or as a protective or decorative material for covering surfaces of objects.
  • the surface of the adhesive layer intended to produce the adhesive bond is usually covered with a cover, also called a release liner, which is removable and is removed from the adhesive layer before the adhesive product is used.
  • the adhesive layer surface is not completely smooth, but has recesses which facilitate the escape of air during the bonding process.
  • This can be achieved, in particular, by covering the surface of the adhesive layer with a cover which, on the side facing the adhesive layer, has corresponding three-dimensional relief-like raised surface structures which can form a regular or irregular pattern.
  • the cover is placed on an adhesive layer and pressed, the surface structures are embossed in the adhesive layer, so that there corresponding complementary (or negative) surface structures are formed, which form a corresponding complementary pattern.
  • Release liners with textured surfaces are commercially available.
  • the height of these structures is 20 to 50 microns or more, which in the
  • Adhesive layers corresponding complementary structures are generated with a depth of about 20 to 50 microns.
  • a cover for adhesive layers of adhesive products which has at least one surface which is connectable to an adhesive layer and is removable from this again.
  • the said surface of the cover has at least a three-dimensional, raised structure. This can be formed for example from a plurality of individual raised, interconnected structures.
  • the three-dimensional raised surface structure causes a corresponding complementary pattern of recesses in the release layer releasably connected to the cover by embossing the raised structures into the surface of the adhesive layer.
  • a complementary embossed structure is formed.
  • the mentioned three-dimensional surface structure of the cover forms in the adhesive layer a complementary embossing structure in the form of an open channel structure, wherein the depth of the channels formed in the adhesive layer is at most 4 ⁇ m.
  • a channel structure with the features described above is suitable to significantly reduce the formation of air pockets during the application process.
  • even a maximum depth of only 3 microns is still sufficient to effectively suppress the formation of air bubbles in the application.
  • the height of the raised structure (s) is preferably at most 4 ⁇ m, in particular at most 3 ⁇ m, each measured from the surface of the cover in the immediate vicinity of the respective raised structure.
  • the invention is not limited to the prevention of air inclusions; it also extends to inclusions of other gaseous and / or liquid substances or mixtures of substances and allows the discharge of liquid and / or gaseous substances or mixtures into the environment, as described above for the example of air pockets.
  • the area ratio of the raised surface structure (s) is preferably in the range of 0.1 to 50%, in particular in the range of 1 to 10%, based on the total area of the cover or a randomly selected surface portion.
  • the covers according to the invention have at least one surface which can be connected to an adhesive layer and is subsequently removable from it.
  • Materials suitable for this purpose are known to the person skilled in the art and are available on the market; Covers of the following materials are particularly suitable: polyolefins (polyethylene, polypropylene), polyvinyl chloride, ethylene-vinyl acetate copolymers, ethylene-vinyl alcohol copolymers, polycarbonate, polyethylene terephthalate, fluorinated thermoplastics, polyurethanes, polyamides, polyimides, paper, polyethylene coated paper, silicone-coated polymer materials, as well as laminates and co-extrudates of the abovementioned rials.
  • the application of adhesion-reduced (dehesive) coatings can take place before or after the embossing of the cover.
  • the surface of the cover provided with said raised structures in this case has a corresponding dehesive coating.
  • the surface structure present on the surface of the cover is thus shaped such that it can form an open channel structure in an adhesive surface which is covered by such a cover.
  • An open channel structure is understood to mean a coherent system or network of channels or trenches which allows the outward flow of air (or other gaseous or liquid substances), ie. H. towards the edges of the adhesive layer.
  • the channel structure (or the corresponding surface structure) in plan view forms an irregular geometric surface pattern, or it is composed in an irregular arrangement of a plurality of geometric shapes, preferably in the form of an irregular honeycomb or lattice structure.
  • the surface structure of the cover is a structure produced by an embossing process, preferably using an embossing roll or embossing plate.
  • the covers according to the invention can be produced simply and cost-effectively, since they can be produced by known embossing methods from known and generally available starting materials.
  • the channel structure (or the corresponding three-dimensional surface structure) forms a regular geometric surface pattern, or it is in a regular arrangement composed of a plurality of geometric shapes, each of which may be the same or different, preferably in the form of a regular honeycomb or lattice structure.
  • the invention encompasses embodiments in which the channel structure (or the corresponding three-dimensional surface structure) forms an irregular geometric surface pattern.
  • an adhesive product eg, adhesive tape
  • an adhesive product eg, adhesive tape
  • the said raised structures of the three-dimensional pattern, or at - At least a part of these structures are designed in such a way that the structure produced in the adhesive layer is wholly or partially complementary to the three-dimensional (relief-like) structure of the object to be bonded.
  • the surface structure forms a repeating unit, wherein two or more of these repeating units can be arranged side by side and / or in a row.
  • the raised structures of a repeat unit have substantially the same height.
  • the repeating units arranged next to each other and / or in succession each contain substantially the same surface structure or the same regular or irregular arrangement of individual interconnected raised structures.
  • repeat units can be effected, for example, by means of an embossing roller or embossing plate, the length or width of the repetition unit being be determined by the size and width of the embossing roll or by the length and width of the embossing plate used in each case.
  • the repeating units arranged side by side and / or one after another have substantially the same geometric shape and surface area, preferably rectangular or square, with a surface area in the range of 10 cm 2 to 1 m 2 , in particular 25 cm 2 to 250 cm 2 .
  • the surface has one or more elongate raised structures, preferably in the form of ridges or beads, wherein one or more main channels are formed by impressing the elongate raised structures in the adhesive layer be formed, which are in communication with said open channel structure.
  • the main channels are the depressions formed by the elongated structures. The main channels ensure a particularly efficient discharge of the air during the gluing process.
  • the said elongated raised structures preferably extend in a straight line, for example in a parallel arrangement.
  • an arrangement in the longitudinal direction (based on the adhesive tape or on the stripping direction of the cover) is preferred.
  • said elongated raised structures extend in a straight line and in a lattice-like arrangement, preferably in a rectangular or diamond-shaped arrangement.
  • the height of the elongated, raised structures is preferably at most 4 ⁇ m, in particular at most 3 ⁇ m, in each case measured from the surface of the cover in the lower part. indirect environment of the respective raised structure (ie in a region in which the surface of the cover has no raised structures).
  • the elongate raised structures may protrude higher (and form correspondingly deeper main channels in the adhesive layer) than the raised structures of said pattern, the height of the elongated raised structures then being preferably maximally 50 ⁇ m , in particular at most 10 .mu.m, in each case measured from the plane of the surface region which directly surrounds the raised structure.
  • the lateral distance between adjacent (eg, parallel) elongate raised structures is preferably 0.5-100 cm, more preferably 10-200 mm.
  • the elongate raised structures preferably have a width in the range of 10 ⁇ m to 1 mm, more preferably 50 to 100 ⁇ m (each measured at the widest point).
  • the said elongated raised structures preferably have a length in the range of 0.5 cm to 2 m, in particular in the range of 10 cm to 50 cm.
  • the elongate raised structures, or at least some of these structures extend to an outer edge of the cover, for example over the entire width of a cover.
  • the surface of the cover has two or more repeating units arranged side by side or in succession with a three-dimensional surface structure (as described above), wherein between the adjacent repeating units elongate raised structures, such as mentioned above, are attached.
  • a stamping plate having a corresponding raised peripheral edge.
  • embossing roll which has on its lateral surface one (or more) axis-parallel, raised edge (s) or strip (s), and on the two sides a circumferential raised edge.
  • the invention further extends to adhesive products having an adhesive layer covered with a cover of the type described above, as well as to adhesive products which have been covered with such a cover and in the surface of which the said complementary complementary surface (s).
  • Embossed structure is embossed / are. This means that even after the cover has been detached from the adhesive layer, the embossed structure is retained at least temporarily in the adhesive layer.
  • the surface of the adhesive layer has, after peeling off the cover, a cohesive channel system which is produced by the impressing of the said pattern and which permits extremely effective removal of air (or other gaseous substances, or of liquids) ensures the edges of the adhesive layer, so that the formation of air bubbles or trapped air (or other gaseous inclusions or liquid-filled inclusions) is avoided.
  • the adhesive products according to the invention have one or more of said elongate main channels, which extend to an outer edge of the adhesive layer.
  • the adhesive products according to the invention are, in particular, adhesive tapes or adhesive films, which may each be single-sided or double-sided adhesive.
  • the adhesive products may additionally have a carrier layer on which the adhesive layer is applied and with which this is firmly connected.
  • the carrier layer can be made, for example, from materials such as paper, fleece, films, fabrics or foams; suitable materials for this purpose are known in the art.
  • the covers according to the invention are also suitable for use in carrier-free adhesive products (transfer adhesive tapes, transfer adhesive films).
  • composition of the adhesive layer of the adhesive products according to the invention is preferably selected so that the flow properties of the adhesive layer are such that the complementary embossed structures (ie depressions) embossed by the cover remain intact even after the cover has been detached from the adhesive layer preferably at least for a period of 5 minutes after peeling, more preferably at least for a period of 30 minutes after peeling, each at an ambient temperature of 15 to 25 ° C.
  • Adhesives and adhesive layers contemplated for the purposes of the present invention are also known to those skilled in the art and are available on the market. Preference is given to using pressure-sensitive adhesives and pressure-sensitive adhesive layers, solvent-based pressure-sensitive adhesives, water-based pressure-sensitive adhesives (eg dispersions), solvent-free pressure-sensitive adhesives or hot-melt pressure-sensitive adhesives of very different composition being suitable, for example polyacrylate-based pressure-sensitive adhesives, silicone pressure-sensitive adhesives, PSAs based on adhesives of synthetic rubber, pressure-sensitive adhesives based on natural rubber, PSAs based on cellulose derivatives, and combinations thereof.
  • each repeat unit having an open channel structure having. Between the adjoining repeating units are formed one or more main channels communicating with said open channel structure.
  • the invention also extends to methods for producing covers of the type described above.
  • the inventive methods are based on the fact that a surface of a material web is provided with at least one three-dimensional, raised structure.
  • This structure (s) is / are generated in such a manner that its height is at most 4 ⁇ m, preferably at most 3 ⁇ m, each measured from the surface of the cover in the immediate vicinity of the respective raised structure.
  • the said surface of the material web is additionally provided with one or more elongated raised structure (s), preferably in the form of ridges or beads, said elongate raised structures being produced in such a way as to conform to the said three-dimensional surface structure related.
  • said raised structures are produced by embossing methods, in particular using an embossing roll (rotary embossing) or a stamping plate (master embossing).
  • embossing methods in particular using an embossing roll (rotary embossing) or a stamping plate (master embossing).
  • embossing tools which are suitable for forming the structures mentioned in the form of repeating units, as described above.
  • the embossing of the cover preferably takes place from the side opposite to the side intended for contact with the adhesive layer.
  • the raised structures may also be produced by other known methods be, for example, by printing process or roller application or by etching.
  • said three-dimensional surface structure is formed in the form of a plurality of repeat units, wherein one or more of said elongate raised structures are formed between each adjacent repeat units.
  • the manufacturing method according to the invention may comprise a further step in which the side of the cover intended for contact with an adhesive layer is treated by means of siliconization or fluorosiliconization. This step can be done either before or after the embossing process.
  • the present invention further extends to the use of the covers described above for the production of single- or double-sided adhesive products, preferably of adhesive tapes or adhesive films, as well as to a method for reducing the risk of the formation of inclusions of gaseous or liquid substances, in particular air pockets. when bonding an adhesive product to a substrate.
  • This procedure includes the following steps:
  • adhesive products e.g., single-sided or double-sided adhesive tapes or labels
  • adhesive products can be made by placing or pressing an embossed cover onto the adhesive surface of a previously formed adhesive product.
  • the preparation may also be carried out by applying a liquid adhesive composition (eg, adhesive solution, dispersion, melt) to the surface of the cover provided with the three-dimensional raised structure (s) (e.g. B. by doctor blade application).
  • a liquid adhesive composition e.g, adhesive solution, dispersion, melt
  • the described open channel structure is formed in the adhesive layer.
  • the cover used in the manufacture can either remain on the adhesive layer (until applied), or it can be peeled off and replaced with a conventional cover (with a smooth surface). In the latter case, the cover according to the invention is used only as a process foil during manufacture to produce said channel structure in the adhesive layer.
  • an adhesive product is carried out in such a way that initially produces an adhesive layer or loading is provided, which is covered on one of the two surfaces with a cover which is smooth on the adhesive layer side facing or at least does not have a three-dimensional, raised structure, which is suitable in the adhesive layer, an open channel structure with a maximum depth of 4 microns to build.
  • the cover may be laminated to a previously prepared adhesive layer, or the adhesive layer may be formed by direct coating on the cover.
  • the cover connected to the adhesive layer is provided with the said raised structures from the free side (facing away from the adhesive layer) of the cover, preferably by embossing. By the embossed pattern in the cover at the same time a corresponding embossing of the adhesive layer connected to the cover is effected.
  • Fig. 1 shows - in plan view - an area of a cover (1) with a first raised surface structure (10), which forms an irregular geometric cluster. Between the raised areas of the surface structure (10) are island-like surface areas (15) which are not raised, but lie in the plane of the surface of the cover.
  • Fig. 2 shows the cover (1) shown in Fig. 1 in a sectional view.
  • the raised structure (10) protrudes from the surface (2) of the cover (1).
  • the height h of the structure, measured from the surface (2) of the cover, is 1-4 ⁇ m.
  • FIG. 3 shows-in plan view-a surface area of an adhesive layer (20) in which, by pressing on the surface shown in FIG. showed cover (1) on the adhesive layer surface and by subsequent detachment of this cover a correspondingly complementary embossing pattern (10 ') was generated.
  • This embossing pattern represents an open channel structure, ie the channels (11, 12) lead to an outer edge of the adhesive layer.
  • Fig. 4 shows - in plan view - a modification of the cover shown in Fig. 1.
  • the surface of the cover additionally has an array of elongate raised ones
  • FIG. 5 shows-in plan view-a surface area of a cover according to the invention with successive repeat units (50, 51, 52), each repeat unit having substantially the same embossing pattern (10) (not shown). Between the repeating units and at their lateral edges there are elongate raised structures (33, 33 ", 33", 34, 34 ') for forming said main channels.
  • the longitudinal direction is indicated by the arrow (a), the width is denoted by (B).
  • FIG. 6 shows-in section-an adhesive tape according to the invention with a removable cover (1), a carrier (70), and an intermediate adhesive layer (80) which is permanently connected to the carrier.
  • the cover (1) has an embossed, raised surface structure (10) which leaves corresponding complementary recesses in the adhesive layer (80) after detachment of the cover (1), the depth of which is 1-4 ⁇ m, measured from flat adhesive surface , which is bounded by the surface (2) of the cover (1).
  • the covers according to the invention are advantageously suitable for use in the production of adhesive products of various kinds.
  • a commercially available release liner of polyethylene-coated, siliconized paper with smooth surfaces is used as a starting material for the production of a cover according to the invention.
  • the thickness of the paper layer is about 0.1 mm; the polyethylene layer has a thickness of about 30 ⁇ m.
  • the embossing is carried out by means of a heated (about 70-90 0 C), embossing roller (steel) equipped with a relief structure and a likewise heated, rubberized counter-pressure roller, so that on the PE-coated, siliconized side of the liner, a raised relief structure is generated (as shown in Fig. I and Fig. 2) with a height of 3-4 microns.
  • the examination of the embossed structure produced can be done for example by interferometric methods, laser profilometry, microscopy or with the help of Rauheitsmeßtechnikn.
  • an adhesive tape a solution of an acrylate pressure-sensitive adhesive is applied to the structured surface of the liner using a doctor blade applicator and dried, so that a basis weight of 80-100 g / m 2 results.
  • the free surface of the dried adhesive layer is covered with a carrier layer (eg PET film, 15 ⁇ m).
  • a carrier layer eg PET film, 15 ⁇ m.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Adhesive Tapes (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne une pellicule de protection (1) destinée aux couches adhésives de produits adhésifs et comprenant au moins une surface qui peut être fixée de manière détachable à une couche adhésive. Selon l'invention, cette surface (2) présente au moins une structure en relief tridimensionnelle (10) servant à réaliser, dans une couche adhésive fixée de manière détachable à la pellicule de protection, une structure gaufrée complémentaire correspondante par incrustation de la ou des structures en relief (10) dans la surface de la couche adhésive. Cette structure gaufrée forme une structure ouverte de conduits dans la couche adhésive, la profondeur des conduits réalisés dans la couche adhésive ne dépassant pas 4 µm.
PCT/EP2006/012178 2005-12-23 2006-12-18 Pellicule de protection a structures superficielles fines pour eviter la formation de bulles d'air lors de l'application de produits adhesifs WO2007079913A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005061766A DE102005061766A1 (de) 2005-12-23 2005-12-23 Abdeckung mit feinen Oberflächenstrukturen zur Verminderung der Luftblasenbildung bei der Applikation klebender Erzeugnisse
DE102005061766.2 2005-12-23

Publications (1)

Publication Number Publication Date
WO2007079913A1 true WO2007079913A1 (fr) 2007-07-19

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PCT/EP2006/012178 WO2007079913A1 (fr) 2005-12-23 2006-12-18 Pellicule de protection a structures superficielles fines pour eviter la formation de bulles d'air lors de l'application de produits adhesifs

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DE (1) DE102005061766A1 (fr)
WO (1) WO2007079913A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2251391A1 (fr) 2009-05-14 2010-11-17 tesa SE Bande adhésive détectable optiquement ayant des propriétés de brillance réduites
JP2011518063A (ja) * 2008-04-22 2011-06-23 スリーエム イノベイティブ プロパティズ カンパニー 接着物品
CN104861883A (zh) * 2014-02-26 2015-08-26 凯孚尔有限公司 配备胶粘剂层压膜的方法和涂抹圆柱形热熔胶的方法
WO2018203260A1 (fr) * 2017-05-05 2018-11-08 3M Innovative Properties Company Films profilés

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DE102008062562A1 (de) * 2008-12-16 2010-06-24 Funkwerk Information Technologies Karlsfeld Gmbh Haft- oder Klebestreifen, -band und -folie, Verfahren und Vorrichtung zum Vorformen von Haft- oder Klebestreifen, -bändern und -folien sowie dessen/deren Verwendung
JP4831840B2 (ja) * 2009-02-25 2011-12-07 株式会社村上開明堂 車両用ミラーおよびその製造方法
WO2019193501A1 (fr) * 2018-04-04 2019-10-10 3M Innovative Properties Company Structures non continues chaotiques utiles pour les systèmes adhésifs fonctionnels
US20210095166A1 (en) * 2018-04-04 2021-04-01 3M Innovative Properties Company Transfer tape with fluid egress channels

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WO2002013980A1 (fr) * 2000-08-15 2002-02-21 3M Innovative Properties Company Pellicule detachable structuree et procede de revetement de cette derniere
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US6759110B1 (en) * 2000-08-15 2004-07-06 3M Innovative Properties Company Structured release liners with improved adhesion to adhesive articles
US6838142B2 (en) * 2001-05-18 2005-01-04 3M Innovative Properties Company Specular laminates
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WO1993003107A1 (fr) * 1991-08-05 1993-02-18 Minnesota Mining And Manufacturing Company Bande de support souple nervuree recouverte d'une couche de silicone sur certaines surfaces predeterminees
WO1998029231A1 (fr) * 1996-12-31 1998-07-09 Minnesota Mining And Manufacturing Company Bandes a gaufrage par phases multiples
WO2002013980A1 (fr) * 2000-08-15 2002-02-21 3M Innovative Properties Company Pellicule detachable structuree et procede de revetement de cette derniere
DE202004001802U1 (de) * 2004-02-06 2004-04-22 Ludwig, Peter Substrat für einen Trennschichtträger

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011518063A (ja) * 2008-04-22 2011-06-23 スリーエム イノベイティブ プロパティズ カンパニー 接着物品
JP2014177123A (ja) * 2008-04-22 2014-09-25 3M Innovative Properties Co 接着物品
EP2251391A1 (fr) 2009-05-14 2010-11-17 tesa SE Bande adhésive détectable optiquement ayant des propriétés de brillance réduites
DE102009021381A1 (de) 2009-05-14 2010-11-18 Tesa Se Optisch detektierbares Klebeband mit verminderten Glanzeigenschaften
US8252402B2 (en) 2009-05-14 2012-08-28 Tesa Se Optically detectable adhesive tape with reduced gloss properties
CN104861883A (zh) * 2014-02-26 2015-08-26 凯孚尔有限公司 配备胶粘剂层压膜的方法和涂抹圆柱形热熔胶的方法
WO2018203260A1 (fr) * 2017-05-05 2018-11-08 3M Innovative Properties Company Films profilés
US11597183B2 (en) 2017-05-05 2023-03-07 3M Innovative Properties Company Profiled films

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