WO2019122040A2 - Pellicule protectrice destinée à recouvrir un ruban adhésif, ruban adhésif recouvert, bobine pourvue de ce ruban adhésif recouvert et leur procédé de fabrication et d'utilisation - Google Patents

Pellicule protectrice destinée à recouvrir un ruban adhésif, ruban adhésif recouvert, bobine pourvue de ce ruban adhésif recouvert et leur procédé de fabrication et d'utilisation Download PDF

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Publication number
WO2019122040A2
WO2019122040A2 PCT/EP2018/086019 EP2018086019W WO2019122040A2 WO 2019122040 A2 WO2019122040 A2 WO 2019122040A2 EP 2018086019 W EP2018086019 W EP 2018086019W WO 2019122040 A2 WO2019122040 A2 WO 2019122040A2
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WO
WIPO (PCT)
Prior art keywords
adhesive tape
layer
adhesive
liner
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2018/086019
Other languages
German (de)
English (en)
Other versions
WO2019122040A3 (fr
Inventor
Jochen Fiencke
Martin Geelink
Marcus Müller
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
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 Tesa SE filed Critical Tesa SE
Priority to EP18833641.6A priority Critical patent/EP3728505A2/fr
Publication of WO2019122040A2 publication Critical patent/WO2019122040A2/fr
Publication of WO2019122040A3 publication Critical patent/WO2019122040A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B29/005—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B29/007—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to a foam layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/32—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed at least two layers being foamed and next to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/06—Interconnection of layers permitting easy separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C09J7/26—Porous or cellular plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/44—Number of layers variable across the laminate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/12—Coating on the layer surface on paper layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/101—Glass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/107—Ceramic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/08—Closed cell foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/14—Adhesive foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/748—Releasability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2405/00—Adhesive articles, e.g. adhesive tapes
    • 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
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
    • C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape

Definitions

  • the present invention relates to a liner which is suitable for covering an adhesive tape. It further relates to a double-sided tape with a cover and an adhesive tape spool comprising a roll core, and the aforementioned covered tape. The invention further relates to a method for producing such an adhesive tape reel and, finally, to the use of this adhesive tape reel for the production of composite articles such as, for example, adhesive tape profiles.
  • covered tape is meant in the context of this application, an adhesive tape together with its adhering thereto liner.
  • actual tape means the tape after removal of the liner.
  • release agent means the paper with non-stick coating or a low or no adhesive film.
  • Double-sided adhesive tapes and adhesive tape reels are known and often used to bond different materials together. Sometimes an article of low or even non-polar material must be adhered to a higher polarity article. Sometimes an adhesive bond to a material of unfavorable, namely low surface tension must be produced. Adhesive tape manufacturers react to such special requirements with special adhesives; in particular, another adhesive may be used on one side of an adhesive tape than on the other.
  • EP 2 746 356 proposes, in this connection, an adhesive tape spool of foamed acrylate adhesive tape which is heat-sealable on one side.
  • This document claims that prior art tape spools were associated with stability issues, for example, during transport.
  • the inventors of EP 2 746 356 A1 propose the use of different release agents, with which the two adhesive surfaces of the double-sided adhesive tape are covered before winding, one of which on one side of the adhesive tape and one on the other side. It should be one the two release agent - and that on the heat sealable side - extend laterally beyond the edge region of the adhesive tape out.
  • the object of the present invention is therefore to provide an adhesive tape which can be unwound and unwound again with at least a slight tendency to fold and corresponding adhesive tape reels.
  • the present invention provides a fissile liner.
  • the tension-resistant members of the covered tape even on only one of the two sides of the tape, even if some of the covered tape reel needs to be peeled off to serve as a drive means in an unwinding device. Because after the cleavage of the liner, that part which is not in direct contact with the pressure-sensitive adhesive side of the adhesive tape can be used as such a drive means, while the other part of the liner remains on the adhesive tape.
  • the invention further comprises a double-sided adhesive tape covered thereby - and only on one side.
  • This liner should preferably survive over at least one, more preferably over both, end faces of the actual adhesive tape. It is sufficient if one of the two parts, in which the liner is fissile, survives. This should preferably be the part that is not in direct contact with the self-adhesive of the actual adhesive tape.
  • the present invention further provides an adhesive tape spool comprising a roll core and a covered double sided adhesive tape thereon.
  • the adhesive tape spool can be produced in a process comprising the following steps:
  • the present invention further relates to the use of the adhesive tape spool described herein for making a composite article. Also according to the invention is the use of the adhesive tape reel for the bonding of profiles, in particular of a thermoplastic, of ethylene-propylene-diene rubber, or of another rubber-like material.
  • the adhesive tape reel of the present invention is not only associated with high transport and storage stabilities, but that according to the invention a squeezing / leakage of the adhesive can be avoided. Without wishing to be bound by the presumption, the inventors believe that this improvement results from a reduced winding tension with which stable adhesive tape rolls are available.
  • the adhesive tape reel according to the invention ensures a continuous application process, even on a large industrial scale, because the increased stability of the adhesive tape reel is retained even after it has been used.
  • this ensures that an adhesive tape reel can also be used at various intervals, and that, moreover, the use of the adhesive tape reel at the beginning of its use is accompanied by similar insertion parameters (unwinding speed and withdrawal resistance) as after consumption of, for example, half of the adhesive tape.
  • the adhesive tape reel of the present invention comprises a roll core, a release paper, and a double-sided adhesive tape.
  • the roll core of the adhesive tape reel according to the invention is usually made of plastic or of hard cardboard.
  • a suitable plastic are olefinic resins such as polyethylene, polypropylene, ethylene-propylene copolymers, blends of polyethylene with polypropylene, and ethylene-vinyl acetate copolymers and polyvinyl chlorides.
  • the shape of the roll core is not subject to any special Restrictions, but is preferably cylindrical.
  • Corresponding cylinders preferably have a length of 1 to 200 cm and a diameter of 3 mm to 50 cm.
  • the double-sided adhesive tape of the adhesive tape reel according to the invention comprises a first outer pressure-sensitive adhesive side (a) and a second outer side (b), wherein the second outer side (b) of the adhesive tape is preferably heat-activated.
  • a pressure-sensitive adhesive layer or a pressure-sensitively adhesive layer in this invention is understood to mean a layer which, especially at room temperature, is permanently tacky and tacky.
  • Characteristic of such a layer is that it can be applied by pressure to a substrate and adhere there, whereby the pressure to be applied and the duration of this pressure are not defined further.
  • the application of a short-term, minimum pressure that does not exceed a light touch for a brief moment to achieve the adhesion effect is sufficient in other cases may also be a longer-term exposure time of high pressure necessary.
  • Pressure-sensitive adhesive layers or pressure-sensitive adhesive layers have special, characteristic viscoelastic properties, which lead to permanent tackiness and adhesiveness.
  • Characteristic of them is that when they are mechanically deformed, it comes both to viscous flow processes as well as to build elastic restoring forces. Both processes are in a certain proportion to each other in terms of their respective proportions, depending on the exact composition, the structure and the Degree of crosslinking of the pressure-sensitive adhesive layer to be considered as well as the speed and duration of the deformation and the temperature.
  • the proportional viscous flow is necessary to achieve adhesion. Only the viscous portions, caused by macromolecules with relatively high mobility, allow a good wetting and a good flow onto the substrate to be bonded. A high proportion of viscous flow leads to a high pressure tack (also referred to as tack or surface tackiness) and thus often also to a high bond strength. Strongly crosslinked systems, crystalline or glassy solidified polymers are usually not or at least only slightly tacky due to the lack of flowable components.
  • the proportional elastic restoring forces are necessary to achieve cohesion. They are caused for example by very long-chained and strongly entangled as well as by physically or chemically crosslinked macromolecules and allow the transmission of forces acting on an adhesive bond forces. They result in an adhesive bond being able to withstand a sustained load acting on it, for example in the form of a permanent shearing load, to a sufficient extent over a relatively long period of time.
  • G ' storage modulus
  • G " loss modulus
  • DMA dynamic mechanical analysis
  • the sizes can be determined with the help of a rheometer.
  • the layered material to be examined is exposed to a sinusoidally oscillating shear stress in a plate-and-plate arrangement, for example.
  • shear stress controlled devices the deformation as a function of time and the time lag of this deformation are compared with the introduction of the shear stress measured. This time offset is referred to as phase angle d.
  • a fabric and the layer produced therefrom are generally considered to be tacky and are defined as tacky, if at room temperature, here by definition at 23 ° C, at least a portion of the G 'curve lies within the window, through the deformation frequency range including 10 ° to 10 1 rad / sec (abscissa) and the range of G 'values of 10 3 to and including 10 7 Pa (ordinate) is spanned, and if at least a portion of the G "curve also within this Window is located. Substances of this type are sometimes referred to as viscoelastic substances and the layers produced therefrom as viscoelastic layers.
  • the terms tacky and viscoelastic are considered as synonymous terms in this invention.
  • a pressure-sensitive adhesive carrier layer in this invention means a viscoelastic carrier layer within said limits for G 'and G ".
  • the first outer tacky adhesive side (a) is the outside of a chemically crosslinked pressure-sensitive adhesive layer or a chemically crosslinked pressure-sensitive adhesive carrier layer.
  • pressure-sensitive adhesive layer and adhesive layer are used as synonyms for the purposes of the present invention.
  • a chemically crosslinked pressure-sensitive adhesive layer or a chemically crosslinked pressure-sensitively adhesive carrier layer is present when the pressure-sensitive adhesive layer or adhesive-sticky carrier layer has reached a state by chemical reaction with a crosslinker that no longer fuses it and no longer solves it in organic solvents. A liquefaction is then possible only by decomposition, which is irreversible.
  • Suitable crosslinkers are all at least difunctional substances which can undergo chemical crosslinking reactions with the functional groups of the pressure-sensitive adhesive. Their selection depends on the functional groups of the pressure-sensitive adhesive.
  • Carboxyl-bearing pressure-sensitive adhesives are typically crosslinked with di- or polyepoxides, possibly with additional catalysis, for example by tertiary amines, or with metal acetylacetonates, metal alkoxides and alkoxy metal acetylacetonates.
  • diisocyanates or polyisocyanates are suitable for crosslinking pressure-sensitive adhesives bearing hydroxyl groups.
  • thermal initiation refers that the crosslinker or the crosslinking system consisting of crosslinker, accelerator and / or initiator, by the action of temperature, the chemical crosslinking reaction and not by radiation. The chemical crosslinking reaction is accordingly activated and triggered by the action of temperature.
  • crosslinking reactions in this invention are thus initiated neither by actinic nor by ionizing radiation such as UV, X-ray nor electron beams.
  • the pressure-sensitive adhesive side (a) is produced in a hot-melt process, in particular an extrusion process.
  • the pressure-sensitively adhesive material from which the pressure-sensitive adhesive layer chemically crosslinked by thermal initiation or the pressure-sensitive adhesive layer chemically crosslinked by thermal initiation is introduced in the molten state into a continuously operating mixing unit, preferably an extruder.
  • the crosslinking system is further introduced, so that the crosslinking reaction is started. This is followed by the discharge of the not yet cross-linked melt from the mixing unit and the immediate coating and shaping of the pressure-sensitive adhesive layer. Meanwhile, the crosslinking reaction started progressing so that the pressure-sensitive adhesive layer has reached its crosslinked state a short time later.
  • the pressure-sensitive adhesive layer is foamed or has a foam-like consistency.
  • the foam or the foam-like consistency may have been produced by the inputs or by the chemical production of one or more gases in the polymer matrix or by the use of micro-glass beads, hollow glass microspheres and / or micro-plastic balls of all kinds. Mixtures of the substances mentioned can also be used.
  • the microplastic balls can be used pre-expanded or in a non-pre-expanded, expandable form, wherein it comes in the course of the manufacturing process for expansion.
  • the expandable microplastic balls, also called microballoons are elastic hollow spheres which have a thermoplastic polymer shell; they are therefore also referred to as expandable polymeric microspheres.
  • These balls are filled with low-boiling liquids or liquefied gas.
  • polyacrylonitrile, polyvinyldichloride (PVDC), polyvinyl chloride (PVC), polyamides or polyacrylates are used as the shell material.
  • Hydrocarbons of the lower alkanes, for example isobutane or isopentane, which are enclosed in the polymer shell as a liquefied gas under pressure, are particularly suitable as the low-boiling liquid.
  • the outer polymer shell By acting on the microballoons, in particular by a heat - especially by heat or heat generation, for example by ultrasound or microwave radiation - softened on the one hand, the outer polymer shell.
  • the liquid propellant gas in the casing changes into its gaseous state.
  • microballoons For a given pairing of pressure and temperature, referred to herein as critical pairing, the microballoons expand irreversibly and expand three-dimensionally. The expansion is completed when the internal and external pressures equalize. As the polymeric shell is preserved, this results in a closed-cell foam.
  • a variety of microballoon types are commercially available, such as Akzo Nobel's Expancel DU grades (dry unexpanded), which are essentially sized (6 to 45 microns in unexpanded state) and their starting temperature required for expansion (FIG. 75 ° C to 220 ° C) differentiate.
  • unexpanded microballoon types are also obtainable as an aqueous dispersion having a solids or microballoon fraction of about 40 to 45% by weight, and also as polymer-bound microballoons (masterbatches), for example in ethylvinyl acetate having a microballoon concentration of about 65% by weight.
  • masterbatches polymer-bound microballoons
  • microballoon slurry systems are available in which the microballoons are present with a solids content of 60 to 80 wt .-% as an aqueous dispersion.
  • Both the microballoon dispersions, the microballoon slurries and the masterbatches are, like the DU types, suitable for foaming in accordance with the advantageous development of the invention.
  • the foams produced with microballoons Due to their flexible, thermoplastic polymer shell, the foams produced with microballoons have a higher gap bridging capability than those which do not expandable, non-polymeric hollow microspheres (such as glass or ceramic hollow spheres) are filled. Therefore, they are better suited to compensate for manufacturing tolerances, as they occur for example in injection molded parts. Furthermore, such a foam can better compensate for thermal stresses.
  • the mechanical properties of the foam can be further influenced.
  • typical foam properties such as adaptability to rough substrates with a high cohesive strength can be combined for pressure-sensitively adhesive foams.
  • the pressure-sensitive adhesive side (a) of the adhesive tape is the outside of an adhesive layer based on a known, chemically crosslinked by thermal initiation polyacrylate pressure-sensitive adhesive.
  • Suitable crosslinkers for polyacrylate pressure-sensitive adhesives are di- or polyisocyanates, in particular dimerized or trimerized isocyanates, di- or polyepoxide compounds, epoxide-amine crosslinker systems, and for coordinative crosslinking metal acetylacetonates, metal alkoxides and alkoxy-metal acetylacetonates, in each case in the presence of functional groups in the polymer macromolecules which can react with isocyanate groups or epoxide groups and can form coordinative compounds with the metal compounds.
  • the crosslinker or, in the case of crosslinker systems, at least one constituent of the crosslinker system is added to the melt late and mixed in very homogeneously (by an efficient mixing, for example in the extruder) by the residence time of the reactive system in the polymer melt very short and therefore to make the processing time ("pot life") as long as possible.
  • the essential part of the crosslinking reaction takes place only after the formation of the polymer, in particular after its formation to the layer, instead of, preferably at room temperature.
  • Crosslinker system components in the relatively short residence time in the polymer melt prior to coating to actually guarantee a very homogeneously cross-linked end product.
  • crosslinker accelerator system comprising at least one epoxide group-containing substance as crosslinker and at least one at a temperature below the melting temperature of the polyacrylate for the linking reaction accelerating substance as accelerator.
  • Suitable epoxide-containing substances are, for example, multifunctional epoxides, in particular bifunctional or trifunctional (ie those epoxies having two or three epoxide groups), but also higher-functional epoxides or mixtures of differently functional epoxides.
  • accelerators may preferably amines (formally be considered as substitution products of ammonia), for example, primary and / or secondary amines; In particular, tertiary and / or multifunctional amines are used. It is also possible to use those amines which have a plurality of amine groups, where these amine groups may be primary and / or secondary and / or tertiary amine groups, in particular diamines, triamines and / or tetramines. In particular, those amines are selected which undergo no or only minor reactions with the polymer building blocks.
  • an accelerator can continue to be used, for example, those based on phosphate, such as phosphines and / or phosphonium compounds.
  • polymers based on acrylates and / or methacrylates can be both foamed and crosslinked, it being advantageous for at least some of the acrylic esters to contain the functional groups and / or comonomers which have the functional groups to be present.
  • functional groups of the polymer to be crosslinked in particular on (Meth) acrylate, especially acid groups (carboxylic acid, sulfonic acid and / or phosphonic acid groups) and / or hydroxyl groups and / or acid anhydride groups and / or epoxy groups and / or amine groups, selected and in particular adapted to the particular crosslinking agent. It is particularly advantageous if the polymer contains copolymerized acrylic acid and / or methacrylic acid.
  • Formulation ingredients such as fillers, resins, especially tackifying resins, plasticizers, flame retardants, anti-aging agents (antioxidants), light stabilizers, UV absorbers, rheological additives, and other auxiliaries and additives.
  • the second outer side (b) of the adhesive tape described herein may be a pressure-sensitive adhesive side of the double-sided adhesive tape, just like the first outer side (a).
  • the outer side (b) of the double-sided adhesive tape described herein is the outside of a heat-activatable layer and thus heat-sealable.
  • the heat-activatable layer is particularly preferably a layer based on a thermoplastic, preferably a polyolefin or a polyolefin mixture. Thermoplastics form thermoformable, fusible and weldable layers, with the processes of molding, melting and welding being reversible and repeatable.
  • thermoplastics are polyamide, polyester, thermoplastic polyurethane and polyethylene vinyl acetate.
  • EPDM i.e., ethylene-propylene-diene rubber
  • polyolefins or polyolefin copolymers or mixtures of the substances mentioned, in particular polypropylene copolymers are particularly preferred.
  • One for the production of a composite of the adhesive tape according to the invention and a profile of EPDM or another rubber-like material by hot sealing the heat-activatable side of the adhesive tape on the profile particularly preferred ethylene-propylene copolymer has a DSC-determined melting temperature of between 140 ° C and 180 ° C inclusive, preferably between 150 ° C and 170 ° C inclusive.
  • the abbreviation DSC stands for the known thermoanalytical method "differential scanning calorimetry" according to DIN 53765: 1994-03.
  • the adhesive tape is an adhesive tape having a pressure-sensitive adhesive layer based on polyacrylate and a heat-activatable layer, wherein the pressure-sensitive adhesive layer and the heat-activatable layer are in direct contact with one another or are separated from one another by a carrier layer.
  • the heat-activatable layer is in direct contact with the pressure-sensitive adhesive layer based on polyacrylate.
  • the surface of the heat-activatable layer, which in this case is in direct contact with the pressure-sensitive adhesive layer based on polyacrylate, may have been corona or plasma pretreated prior to the production of this contact.
  • a corona pretreatment is a filamentary discharge surface treatment produced by high alternating voltage between two electrodes, the discrete discharge channels meeting the substrate surface to be treated.
  • corona is usually understood to mean a “dielectric barrier discharge” (DBD).
  • the corona pretreatment is well-known as a method for surface pretreatment (see also Wagner et al., Vacuum, 71 (2003), pages 417 to 436) and is widely used industrially. Without further qualification, ambient air is assumed to be the process gas, which is not the case in this invention.
  • process gases other than air such as nitrogen, carbon dioxide or noble gases, is also known in the art.
  • the substrate is placed or passed in the discharge space between an electrode and a counter electrode, which is defined as a direct physical treatment.
  • Web-shaped substrates are typically carried out between an electrode and a grounded roller.
  • the substrate is pressed onto the counter electrode designed as a roller in order to prevent air pockets.
  • the treatment distance is typically about 1 to 2 mm.
  • a fundamental disadvantage of such a two-electrode geometry with a treatment in the space between electrode and counter electrode is the possible backside treatment. With the smallest air or gas inclusions on the back, for example, if the web tension is too low in a roll-to-roll treatment, there is a mostly unwanted corona treatment of the back.
  • corona treatment in air is a technique in which plasma plays a role
  • a plasma treatment at atmospheric pressure is usually understood to mean a narrower definition.
  • a corona treatment at atmospheric pressure in the narrower sense is a homogeneous and discharge-free treatment.
  • noble gases partly with admixtures, such a homogeneous plasma can be produced.
  • the treatment takes place in a two-dimensional reaction chamber homogeneously filled with plasma.
  • the reactive plasma contains radicals and free electrons, which can react quickly with many chemical groups in the substrate surface. This leads to the formation of gaseous reaction products and highly reactive, free radicals in the surface. These free radicals can rapidly react by secondary reactions with other gases and form various chemical functional groups on the substrate surface. As with all plasma techniques, the generation of functional groups is in competition with material degradation.
  • the substrate to be treated can instead of the reaction space of a two-electrode geometry also be exposed only to the discharge-free plasma ("indirect" plasma).
  • the plasma is then usually also in good approximation potential-free.
  • the plasma is usually driven away by a gas flow from the discharge zone and passed to the substrate after a short distance.
  • the lifetime (and thus the usable distance) of the reactive plasma, often called afterglow, is determined by the exact details of the recombination reactions and the plasma chemistry. Usually an exponential decay of reactivity with distance from the discharge source is observed.
  • the nozzle can be round or linear, partially worked with rotary nozzles, without wishing to make a restriction here.
  • a nozzle principle is advantageous because of its flexibility and its inherently one-sided treatment.
  • Such nozzles for example the company Plasmatreat GmbH (Germany), are widely used industrially for the pretreatment of substrates before bonding. Disadvantages are the indirect and less efficient since discharge-free treatment, and thus the reduced web speeds.
  • the usual design of a round nozzle is particularly well suited to treat narrow webs such as an adhesive tape with a width of a few centimeters.
  • a suitable atmosphere in this invention nitrogen, carbon dioxide or a noble gas or a mixture of at least two of these gases has been found.
  • gas for example ethylene
  • liquids as aerosol.
  • the indirect plasma techniques are suitable for the use of aerosols, since there is no risk of contamination of the electrodes.
  • Plasma pretreatment in this invention means an atmospheric pressure plasma pretreatment.
  • an electrically activated, homogeneous, reactive gas is defined, which is not in the thermal equilibrium, with a pressure close to the ambient pressure.
  • the electrical discharges and ionization processes in the electric field activate the gas and generate highly excited states in the gas constituents.
  • the gas or gas mixture used is called process gas. Basically, one can also coat the plasma atmosphere
  • homogeneous indicates that no discrete, inhomogeneous discharge channels strike the surface of the substrate to be treated (even though they may be present in the production space).
  • the restriction "not in thermal equilibrium” means that the ion temperature may differ from the electron temperature. For a thermally generated plasma, they would be in equilibrium (see, for example, Akishev et al., Plasmas and Polymers, Vol. 7, No. 3, Sept. 2002).
  • oxygen contents of not more than 1000 ppm, preferably not more than 100 ppm, more preferably not more than 10 ppm.
  • the corona pretreatment is preferably carried out at a dose of 1 to 150 W-min / m 2 . Particularly preferred are a dose of 10 to 100 W-min / m 2 and in particular a dose of 20 to 80 W-min / m 2 .
  • the pressure-sensitive adhesive layer and the heat-activatable layer are preferably in direct contact with one another. By this is meant that between the corona or plasma pretreated surface of the heat-activatable layer, which is in direct contact with the pressure-sensitively adhesive layer, no additional further substances or layers are applied or are located there. Direct contact accordingly means that no additional adhesive, pressure-sensitive adhesive, adhesion-promoting or other substance is between or introduced into the layers.
  • the direct contact between the layers is made by a conventional laminating or laminating process, preferably at room temperature.
  • the laminating or lamination process is preferably carried out directly after the corona or plasma pretreatment of the surface of the heat-activatable layer. Between the corona or plasma pre-treatment of the surface of the layer and the laminating or laminating process pass ideally
  • the contact between the layers is preferably produced in the already chemically crosslinked state of the pressure-sensitively adhesive layer, ie at a time when the crosslinking reaction proceeding by thermal initiation has already progressed so far that the pressure-sensitive adhesive layer can no longer be melted.
  • networking does not have to be complete at this time, but it can be.
  • Possible carrier layers which separate the heat-activatable layer and the polyacrylate-based pressure-sensitive adhesive layer in an alternative embodiment are not subject to any particular restrictions.
  • films, foams, nonwovens, adhesive layers, foamed adhesives, particularly preferably viscoelastic and foamed adhesives are used.
  • the layer structure of the adhesive tape of the present invention is therefore not limited to a two-layer structure in which an adhesive layer is in direct contact with a heat-activatable layer.
  • the adhesive tape reel of the present invention comprises a release paper.
  • release paper does not depict the present invention on paper in the classical sense. Rather, the present invention uses the term “release paper” as a synonym for the expression of “release liners” or “release liners”.
  • the release paper (release liner) as used herein has a first surface and a second surface, which for the purposes of the present invention are also referred to as release layer (A) and tear layer (B).
  • Tenning layer (A) is in the wound state of the adhesive tape with the outer pressure-sensitive adhesive side (a) in contact; Release layer (B) is in the wound state of the adhesive tape with the outer side (b) of the adhesive tape in contact.
  • a release paper is used according to the invention, which ensures a connection of the outer adhesive side (a) with the second outer side (b) of the double-sided adhesive tape in the wound state.
  • the release paper particularly preferably has a lower carrier layer (U) and an upper carrier layer (O), the separating layer (A) being the outer side of the lower carrier layer (U) and separating layer (B) being the outer side of the upper carrier layer (O).
  • the carrier layers (O) and (U) are separable, more preferably irreversibly separable connected to each other.
  • Suitable carrier layers for the release paper are all known liner materials.
  • the liner material may be flexible or relatively strong, transparent or opaque and, for example, colored.
  • the separating layers (A) and (B) of the release paper are designed to have the desired adhesion to the first outer pressure-sensitive adhesive side (a) (in the case of the release layer (A)) and the desired adhesion to the second outer side (b). (In the case of the release layer (B)) have.
  • release layer (A) therefore, all known for the coverage of PSAs separating materials in question.
  • the release layer (B) preferably consists of a polyolefin, provided that the outer side (b) of the double-sided adhesive tape is heat-activated.
  • the release layer (A) is preferably a siliconized surface.
  • FIG. 1 An exemplary structure (layer structure) of double-sided adhesive tape and release paper in the context of the present invention is shown in FIG. 1.
  • T denotes the release paper; "A” the release liner (A), “B” the release liner (B), “a” the first outer tacky adhesive side (a) of the double-sided adhesive tape, “b” the second outer side (b) of the double-faced adhesive tape; “O” an upper support layer (O); “U” a lower support layer (U); “K” the double-sided adhesive tape; and “psa” a pressure-sensitive adhesive.
  • the release paper T contains so preferably a lower and an upper carrier layer (U), (O).
  • U upper carrier layer
  • the lower carrier layer (U) is joined to the upper carrier layer (O) via a pressure-sensitive adhesive "psa".
  • a release paper is provided, which has separably interconnected carrier layers.
  • the bond between the upper and lower carrier layers ((U), (0)) is not limited to pressure-sensitive adhesives. Rather, other fasteners come into question, for example, curing adhesives such as paints or polymer layers, which are delaminated from the upper or lower carrier layer (O), (U).
  • laminating compounds for bonding upper and lower carrier layers wherein the laminating compound forms a predetermined breaking point.
  • Corresponding laminating compounds are disclosed in EP 2 130 886 A2 and can be provided in the form of full-area or non-full-surface connecting elements.
  • Corresponding connecting elements are described in EP 2 130 886 A2 with regard to their function as "predetermined breaking point". Accordingly, for the connection of the upper and the lower carrier layer, polymers can be used which are preferably selected from the group comprising polyvinyl chlorides, polyvinylidene chloride, polyvinyl alcohols, polyvinyl acetates, polyvinylpyrrolidones, copolymers
  • a preferred polymer disclosed in the above-mentioned document and also excellently usable in the present invention is a repulpable polymer, for example based on polyvinyl alcohol, preferably also comprising one or more plasticizers.
  • Particularly preferred plasticizers are compounds such as polyols (for example diethylene glycol), hydroxy-modified rubbers or a
  • the laminating compounds are preferably selected so that they have no adhesive force in the form of their dried films, even at relatively high temperatures, so that they do not contaminate any machine parts or production goods after the upper and lower carrier layers have been separated.
  • the release paper can also consist of a cleavable carrier which decays without an adhesion-promoting adhesive or a connecting polymer into a lower and an upper carrier layer, if corresponding forces act in the region of the predetermined breaking point.
  • the release paper has an upper and a lower carrier layer ((O), (U)), which are connected to one another in such a way that they can be separated from one another with a splitting force of 0.2 to 200 cN / cm ,
  • At least one of the separating layers (A) and (B) extends over at least one edge region of the adhesive tape.
  • This can be achieved by dimensioning the release paper so that its width is greater than the width of the double-sided adhesive tape.
  • the release paper is dimensioned such that its width exceeds the width of the double-sided adhesive tape by 5% or more, preferably by 10% or more, more preferably by 20% or more preferably the width does not exceed 1, 5 times the tape width.
  • the width of the release paper or the respective release layer (s) exceeds the width of the adhesive tape by 10%, preferably 20% , preferably 40% or more, wherein the total width of the release paper preferably does not exceed twice the width of the adhesive tape.
  • the thickness of the adhesive tape described herein is, for example, 1 ⁇ m to 10 mm, preferably 100 ⁇ m to 5 mm, particularly preferably 200 ⁇ m to 2 mm.
  • Particular embodiments of the adhesive tape reel described herein have a length of the adhesive tape of from 1 to 2000 m, preferably from 10 to 1500 m, more preferably from 200 m to 1000 m.
  • the width of typical adhesive tapes ranges from 1 to 1000 mm.
  • Preferred adhesive tape widths are 10 to 500 mm, more preferably 10 to 200 mm.
  • the present invention relates to a method for producing the described adhesive tape roll.
  • the method according to the invention comprises the following steps:
  • the release paper is preferably radially outward.
  • the adhesive tape is preferably connected via one of the outer sides of the adhesive tape ((a), (b)). It is also possible, however, first the release paper, for example via the release layer (B), i. preferably via the outside of the upper carrier layer (O) to bring into contact with the roll core and to wind accordingly.
  • Typical winding tensions suitable for making the adhesive tape rolls described herein are from 1.4 to 490 cN / cm.
  • a distance of 0.5 mm to 10 mm, preferably 1 mm to 5 mm, particularly preferably from 1, 5 mm to 2.5 mm can be selected between the adjacent turns of a layer of the actual adhesive tape.
  • Winding pitch distance + tape width. Winding pitches preferred according to the invention are 3.5 to 53 mm.
  • the angle should nevertheless be selected as low as possible.
  • This is advantageous in order - depending on the adhesive tape length - to wind up adhesive tape as long as possible and to avoid deformations due to excessive deflections on the coil edges under tension.
  • the angle is given by the circumference of the coil or of the coil core (for example, 6 inches inner diameter, core wall thickness, for example, 5 mm) and the adhesive tape width + turn pitch (also called "installation spacing"). This results in the maximum angle of a coil at the core, which decreases radially outward over the constant laying distance. Typical installation angles vary from 0.1 ° to 6.2 °.
  • the adhesive tape reel according to the invention differs from the prior art by the use of a single release paper and is accompanied by surprising stability values.
  • a single release liner release paper
  • a so-called "drop test” is suitable, as described in EP 2 746 356 A1 (from section [0146]).
  • the use of the release paper described herein, in comparison to adhesive tape rolls with two separate release papers at the same winding tension leads to a lower displacement of adjacent adhesive tape webs in the drop test.
  • the drop test ideally delivers values that are between 0.5 and a maximum of 50 mm.
  • the increase in stability can be further improved by dimensioning the release paper of the adhesive tape reel according to the invention such that at least one of the release layers (A) and (B) of the release paper protrudes beyond both edge regions of the adhesive tape.
  • the release layer (B) extends over both edge regions of the adhesive tape.
  • the separating layer (B) is the outer side of an upper carrier layer (O) and in which the upper carrier layer (O) both over both edge regions of the adhesive tape and over the edge regions of the lower carrier layer (U ) stands out.
  • the upper backing layer (O) has a pressure-sensitive adhesive coating, this coating being applied to the side of the upper backing layer (O) which is bonded to the lower backing layer (U). Since, according to this advantageous embodiment, the upper carrier layer (O) extends over the edge regions of the adhesive tape on the one hand and over the edge regions of the lower carrier layer (U), this pressure-sensitive adhesive layer can impart further stability to the adhesive tape in the wound-up state, ie the adhesive tape roll ,
  • Adhesive tape rolls in which the release paper has tear-resistant layers (A) and (B), which are the outer sides of a lower carrier layer (U) and an upper carrier layer (O), are particularly particularly advantageous in the sense of the present invention and in which the lower carrier layer (U) has the width and dimension of the double-sided adhesive tape, wherein the edge regions of the adhesive tape terminate with the edge regions of the lower carrier layer.
  • the upper carrier layer (O), however, is preferably larger in size.
  • the upper carrier layer (O) preferably extends over both edge regions of the adhesive tape and thus preferably also over both edge regions of the lower carrier layer (U). Also conceivable, however, is an embodiment in which the upper carrier layer extends only on one side over the edge region of the adhesive tape.
  • the invention further teaches a double-sided adhesive tape covered with this liner and a spool of such adhesive tape wound thereon.
  • the liner according to the invention should project beyond at least one of the two edges of the actual adhesive tape.
  • the invention reduces the tendency of the covered tape to drape when winding and unwinding a thick, preferably foamed adhesive tape. It also makes such a coil more stable.
  • the invention also includes a method for producing this adhesive tape reel; and the use thereof for the production of composite articles, in particular for the self-adhesive finishing of profiles.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

La présente invention concerne une pellicule protectrice qui sert à recouvrir un ruban adhésif. Cette pellicule protectrice peut être amovible. L'invention concerne en outre un ruban adhésif à double face recouvert de cette pellicule protectrice et une bobine sur laquelle est enroulé un tel ruban adhésif. La pellicule protectrice selon l'invention doit dépasser au moins un des deux bords du ruban adhésif proprement dit. L'invention réduit la tendance à la draperie lorsqu'un ruban adhésif épais, de préférence expansé, est enroulé et déroulé. Elle rend en outre une telle bobine plus stable. L'invention concerne également un procédé de fabrication de cette bobine de ruban adhésif ; ainsi que l'utilisation de ce dernier pour la fabrication d'objets composites, en particulier pour le traitement autoadhésif de profilés.
PCT/EP2018/086019 2017-12-22 2018-12-19 Pellicule protectrice destinée à recouvrir un ruban adhésif, ruban adhésif recouvert, bobine pourvue de ce ruban adhésif recouvert et leur procédé de fabrication et d'utilisation Ceased WO2019122040A2 (fr)

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EP18833641.6A EP3728505A2 (fr) 2017-12-22 2018-12-19 Pellicule protectrice destinée à recouvrir un ruban adhésif, ruban adhésif recouvert, bobine pourvue de ce ruban adhésif recouvert et leur procédé de fabrication et d'utilisation

Applications Claiming Priority (2)

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DE102017223768.6A DE102017223768A1 (de) 2017-12-22 2017-12-22 Liner zum Eindecken eines Klebebandes, eingedecktes Klebeband, Spule mit diesem eingedeckten Klebeband sowie Verfahren zur Herstellung und zur Verwendung derselben
DE102017223768.6 2017-12-22

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CN116323844A (zh) * 2020-10-09 2023-06-23 德莎欧洲股份公司 具有胶带和两层衬垫的层状构造体

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DE102020215764A1 (de) * 2020-12-11 2022-06-15 Karl Wörwag Lack- Und Farbenfabrik Gmbh & Co. Kg Verfahren zum Aufbringen einer Klebefolie

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