WO2020104316A1 - Composition pour un revêtement de séparation à faible coefficient de frottement - Google Patents

Composition pour un revêtement de séparation à faible coefficient de frottement

Info

Publication number
WO2020104316A1
WO2020104316A1 PCT/EP2019/081466 EP2019081466W WO2020104316A1 WO 2020104316 A1 WO2020104316 A1 WO 2020104316A1 EP 2019081466 W EP2019081466 W EP 2019081466W WO 2020104316 A1 WO2020104316 A1 WO 2020104316A1
Authority
WO
WIPO (PCT)
Prior art keywords
release
weight
adhesive
composition
silicone
Prior art date
Application number
PCT/EP2019/081466
Other languages
German (de)
English (en)
Inventor
Tobias Winkler
Alexander Bamberg
Björn Zeysing
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 EP19808717.3A priority Critical patent/EP3884005A1/fr
Publication of WO2020104316A1 publication Critical patent/WO2020104316A1/fr

Links

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
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/201—Adhesives in the form of films or foils characterised by their carriers characterised by the release coating composition on the carrier layer
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/12—Polysiloxanes containing silicon bound to hydrogen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • 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
    • C09J2483/00—Presence of polysiloxane
    • C09J2483/005—Presence of polysiloxane in the release coating

Definitions

  • the present invention relates to addition-crosslinking silicone compositions which contain at least one monoalkenyl-functionalized polydimethylsiloxane and, after crosslinking, have a reduced coefficient of friction, a limited silicone transfer and a smooth surface structure. Furthermore, the present invention relates to a release liner which contains the crosslinked silicone composition and an adhesive tape in which the PSA is covered on one or both sides with the release liner according to the invention. Finally, the present invention relates to the use of monovinyl-functionalized polydimethylsiloxanes in silicone-containing release liners to reduce the coefficient of friction of the separating layer.
  • Adhesive tapes which are coated on one or both sides with adhesives, are usually wound into a roll in the form of an Archimedean spiral at the end of the manufacturing process.
  • various procedures are known in the prior art.
  • adhesive compositions can be used which have differently strong adhesions and can therefore be detached from one another again even after direct contact (see US Pat. No. 6,274,213 B1).
  • the adhesive tapes can be applied to a covering material (also referred to as a separating material) before winding, which is wound up together with the adhesive tape.
  • a covering material also referred to as a separating material
  • liners are also used to cover labels.
  • Adhesive tapes are also possible, in which the liner is not equipped with two liners, but with a single liner that separates on both sides. The Adhesive tape web is then covered on its upper side with one side of a liner equipped with double-sided separation, its underside with the back of the liner equipped with double-sided separation. This is particularly the case with an adjacent turn on a bale or roll.
  • the liner (release paper, release film) is not part of an adhesive tape or label, but only an aid for its production, storage or for further processing by e.g. Punching. If a double-sided adhesive tape equipped with a liner is unrolled, it is usually glued to a surface with the open, i.e. liner-free, adhesive side. The other PSA side still adheres to the coated surface of the liner to a sufficient extent to allow handling of the adhesive tape. However, the liner must be peelable from the adhesive tape in order to allow gluing on the second side of the double-sided adhesive tape. Therefore, unlike an adhesive tape carrier, the liner must not be firmly attached to the adhesive layer of the adhesive tape or label.
  • the adhesive strength of the PSA must not be significantly impaired for later use by the liner itself or by peeling off the liner.
  • the stability of the release effect of the release coating on the liner i.e. the abhesiveness, is important over long periods of time in order to ensure the function of this coating and the properties of the PSA covered with the liner.
  • a liner according to the prior art consists of at least one adhesive layer, also referred to as a “release layer”, in order to reduce the tendency of adhesive products to adhere to these surfaces (release-effective function).
  • This layer can be applied to a carrier material.
  • papers or foils can be used as the carrier material of the liner.
  • the films used are preferably those made from biaxially stretched polyethylene terephthalate, polybutene, polypropylene, polyethylene, monoaxially stretched polypropylene, biaxially stretched polypropylene or polyethylene, particularly preferably polyolefin films (polypropylene and polyethylene films) or polyester films. You can also find polymer-coated papers or nonwovens.
  • the material of the adhesive release layer is preferably selected from the group comprising silicones, fluorinated silicones, silicone copolymers, waxes, carbamates, fluoropolymers, poly- and oligoacrylates equipped with hydrophobic side chains, polyolefins and mixtures of two or more of the above Fabrics.
  • Crosslinkable silicone systems are often used as the separating layer. These include mixtures of crosslinking catalysts and so-called thermally curable condensation, addition or free radical crosslinking polysiloxanes.
  • condensation-crosslinking silicone systems tin compounds, such as dibutyltin diacetate, are frequently present in bulk as crosslinking catalysts.
  • Silicone-based release coatings based on addition crosslinking can be hardened by hydrosilylation.
  • These separation systems usually comprise the following components: an alkenylated polydiorganosiloxane (in particular linear polymers with terminal alkenyl groups or terminal and internal vinyl groups and branched silicones with terminal vinyl groups), a polyorganohydrogensiloxane crosslinking agent and a hydrosilylation catalyst.
  • Platinum or platinum compounds such as the Karstedt catalyst [a Pt (0) complex compound]
  • rhodium catalysts have become established as catalysts for addition-crosslinking silicone systems.
  • photoactive catalysts can also be used in combination with UV-curable, cationically crosslinking siloxanes based on epoxy and / or vinyl ether, or UV-curable, radically crosslinking siloxanes, such as acrylate-modified siloxanes. It is also possible to use electron-curable silicone acrylates.
  • Corresponding systems can also contain other additives such as stabilizers, pigments, antistatic additives or leveling agents, depending on the intended use. Additives are also used to improve the anchoring of the silicone layer on the carrier material.
  • organopolysiloxane compositions which crosslink by heating or irradiation are also known.
  • Masses such as are described, for example, in DE 600 01 779 T2, which crosslink by addition reaction, namely by heat treatment of a mixture of an organopolysiloxane with hydrogen atoms bonded directly to the silicon atoms and an organopolysiloxane with vinyl groups bonded directly to the silicon atoms in the presence a hydrosilylation catalyst.
  • Photopolymerizable organopolysiloxane compositions can also be used. Examples include compositions which are crosslinked in the presence of a photosensitizer as a result of the reaction between organopolysiloxanes which have (meth) acrylate groups substituted with (meth) acrylate groups and which are bonded directly to the silicon atoms (see EP 0 168 713 B1 or DE 38 20 294 C1). Also usable are compositions in which the crosslinking reaction between organopolysiloxanes which have hydrocarbon substituted with mercapto groups bonded directly to the silicon atoms and organopolysiloxanes with vinyl groups bonded directly to the silicon atoms is brought about in the presence of a photosensitizer. Such masses are described, for example, in US Pat. No. 4,725,630 A1.
  • Organopolysiloxane compositions which have hydrocarbon radicals which are substituted by epoxy groups and are bonded directly to the silicon atoms, the crosslinking reaction is induced by the release of a catalytic amount of acid which is obtained by photodecomposition of added onium salt catalysts.
  • Other organopolysiloxane compositions curable by a cationic mechanism are materials which have, for example, propenyloxysiloxane end groups.
  • silicone systems are polysiloxane block copolymers, for example with urea block, as are offered by Wacker under the trade name Geniomer, or separation systems made of fluorosilicones, which are used in particular in adhesive tapes with silicone adhesives.
  • Waxes, fluorinated or partially fluorinated polymers or polyolefins, in particular polyethylene block copolymers, as described in EP 2 025 07 B1 or WO 2010/022154 A2, and carbamates can also be used as the separating layer.
  • a series of adhesive tapes coated on both sides are unwound and applied with the release liner contained in the product, which covers the second layer of adhesive.
  • the adhesive of the adhesive tape is brought into contact with the surface by hand over the release liner.
  • This painting which is carried out under pressure, there is strong contact between the release liner of the product and the hand.
  • the mostly used release liners have a blunt surface with a high coefficient of friction due to the release material used. In this case, painting the product is uncomfortable to painful - especially if this is done frequently and / or at high speed.
  • Unmodified silicone systems such as those formed by crosslinking solvent-free, functionalized siloxanes, have very good release properties, but have a high coefficient of friction.
  • solvent-containing addition- or condensation-curing silicone systems instead of the solvent-free silicone addition systems that are mainly used industrially, the coefficient of friction is lower.
  • these release silicones are characterized by a pronounced transfer of non-crosslinked silicone components to the adhesive, which leads to a reduction in the adhesive force.
  • the condensation systems use almost exclusively toxic tin catalysts.
  • the coefficient of friction of separation systems can also be added by adding oils or substances that are involved in the crosslinking of the separation system expand the structures formed, are degraded. However, this means that the proportion of migrable substances in the separation system increases. These can reduce their adhesive strength by being deposited on a PSA in contact with the separation system.
  • EP 0 903 385 B1 describes the reduction of the friction of radiation-crosslinking silicone systems by adding spherical silicone particles which are produced by controlled hydrolysis of methyltrimethoxysilane.
  • the complex and inflexible manufacturing process prevents the use of porous or hollow additives, which is particularly advantageous in one aspect of the invention there.
  • US 2005/0074573 A1 describes the production of release liners which have a structured surface to reduce the coefficient of friction. This structured surface is created in a complex process by a cooling roller during the production of the release liners.
  • the coefficient of friction of silicone-containing release liners can be reduced by the addition of powdered polymer particles.
  • the release liner has a surface structure which can be transferred as a microstructure to the PSA.
  • a surface structure can lead to difficulties in the processing process and when using the adhesive tape.
  • the object of the present invention was therefore to provide a separating layer composition and separating layers produced therefrom, the separating layers having a low coefficient of friction. Furthermore, these release layers are said to cause little or no reduction in the adhesive force by transferring some components of the release coating to the adhesive after contact. In addition, these separating layers should have a smooth surface structure, be toxicologically safe and easy to handle in terms of process technology. In general, the present invention is intended to overcome the disadvantages of the prior art.
  • composition for producing a release coating in particular for finishing a release liner, comprising:
  • the object is further achieved by a release liner containing a crosslinked composition according to the invention as a separating layer.
  • the object is achieved by an adhesive tape containing at least one PSA and at least one release liner according to the invention, the PSA being covered on one or both sides with the release liner.
  • the object is achieved by using monovinyl-functionalized polydimethylsiloxane in silicone-containing release liners to reduce the coefficient of friction of the separating layer.
  • release liners made from solvent-free silicone coatings have only a slight migration of constituents of the silicone coating onto the PSA of the adhesive tape and thus only a slight reduction in the adhesive force (adhesive force depression, KKD).
  • the surface of these release liners has a high coefficient of friction, so that painting the adhesive tape on the surface is uncomfortable to painful - especially if this is done frequently and / or at high speed.
  • the coefficient of friction can be reduced by adding long-chain, weakly functionalized silicone compounds or by adding particles.
  • the invention is based on the knowledge that the addition of monoalkenyl-functionalized polydimethylsiloxane generates the freely movable silicone segments in the separating layer, which bring about the low coefficient of friction, by partially reacting the hydrogen-containing compound with the reactive polydimethylsiloxane in situ.
  • the release layers produced in this way have a smooth surface structure, so that a structural transfer to the PSA of the adhesive tape provided with the release layer is avoided.
  • the use of the reactive polydimethylsiloxane ensures an almost complete reaction during crosslinking, so that the formation of migratable silicone components from unreacted polydimethylsiloxane and the associated increase in silicone transfer from the silicone containing release liner layer on the PSA of the adhesive tape, which produces an undesirable adhesive force depression, does not take place or only takes place to a small extent.
  • a reduction in the separation value can be achieved by using, in particular, linear monoalkenyl-functionalized polydimethylsiloxanes. This reduction in the separation value is surprising in that, in the prior art, alkenly group-containing silicone compounds with a low molecular weight compared to polymer a), in particular silicone resins, are used to increase the separation value.
  • composition according to the invention contains at least one special organopolysiloxane a) as the first mandatory component.
  • Linear, cyclic or branched polydialkylsiloxanes can be used as organopolysiloxanes a).
  • Branched polydimethylsiloxanes which contain terminal alkenyl groups are particularly preferably used as component a).
  • the organopolysiloxane a) has a weight-average molecular weight M w of 1,000 to 60,000 g / mol.
  • the data of the average molecular weight M w in this document relate to the determination by gel permeation chromatography in toluene at 23 ° C. and a flow rate of 1.0 ml / min using a modified styrene-divinylbenzene copolymer network as the column material and polydimethylsiloxane as the internal standard as described in the example section
  • the composition according to the invention contains at least one monoalkenyl-functionalized polydimethylsiloxane as a further mandatory component.
  • the monoalkenyl-functionalized polydimethylsiloxane c) is a linear or branched, in particular linear, monovinyl-functionalized polydimethylsiloxane.
  • the use of linear, monovinyl-functionalized polydimethylsiloxanes leads to a reduction in the coefficient of friction.
  • the low inclination of the component can also be advantageous a) largely retained for silicone transfer.
  • a reduction in the separation value can be achieved when using linear polydimethylsiloxanes.
  • the surface friction of the composition can be adapted to the respective requirements by varying the proportion of the monoalkenyl-functionalized polydimethylsiloxane c).
  • the surface friction can be reduced by increasing the proportion of monoalkenyl-functionalized polydimethylsiloxane c), in particular linear, monovinyl-functionalized polydimethylsiloxane, but without adversely affecting the reduction in the release value or the low silicone transfer. In this way, a simple adaptation of the composition to the surface friction required for the respective application is possible.
  • the composition therefore preferably contains component c) in a vinyl fraction of 0.01 to 10 mol%, preferably 0.02 to 8 mol%, preferably 0.03 to 5 mol%, in particular 0, 1 to 4 mol%, based in each case on the molar total vinyl group content of components a) and c).
  • the composition contains components a), b) and c) in certain total amounts.
  • the composition therefore preferably contains component a) in a total amount of 72 to 91 parts by weight, component b) in a total amount of 3 to 8 parts by weight and component c) in a total amount of 1 to 23 parts by weight, in each case based on the sum of the components a), b) and c) of 100 parts by weight.
  • the above-mentioned components a), b) and c) are crosslinked by hydrosilylation reaction between the alkenyl-functionalized organopolysiloxanes (component a), the corresponding SiH-functionalized organopolysiloxanes (component b) and the monoalkenyl-functionalized polydimethylsiloxane (component c).
  • this hydrosilylation reaction is accelerated by the use of catalysts.
  • Platinum or rhodium catalysts are used in particular as catalysts.
  • the platinum or rhodium catalyst is preferably used in a total amount of 40 to 600 ppm, calculated as platinum or rhodium metal and based on the sum of components a), b) and c) of 100 parts by weight is used.
  • the crosslinking reaction is preferably carried out at elevated temperatures of 90 to 200 ° C.
  • composition according to the invention can be solvent-containing or solvent-free.
  • the composition is preferably solvent-free.
  • Solvent-free compositions contain 0 to 1% by weight, in particular 0% by weight, based on the total weight of the composition, of solvents.
  • solvent is to be understood as a compound which can dissolve or dilute liquids or solids without chemical reactions occurring between the solute and the solvent during the entire processing process.
  • the composition according to the invention can also contain further additives.
  • additives are chosen in particular in such a way that the separation values achieved, the surface friction and the silicone transfer of the coating are not negatively influenced.
  • the following additives can be used, for example:
  • Fillers such as silicon dioxide, glass (ground or in the form of spheres), aluminum oxides and zinc oxides,
  • optionally further polymers of preferably elastomeric nature for example based on pure hydrocarbons such as chemically essentially saturated elastomers (saturated ethylene-propylene copolymers, ⁇ -olefin copolymers, polyisobutylene, butyl rubber) and chemically functionalized hydrocarbons (halogen-containing, acrylate-containing or vinyl ether-containing polyolefins),
  • pure hydrocarbons such as chemically essentially saturated elastomers (saturated ethylene-propylene copolymers, ⁇ -olefin copolymers, polyisobutylene, butyl rubber) and chemically functionalized hydrocarbons (halogen-containing, acrylate-containing or vinyl ether-containing polyolefins),
  • Plasticizers such as liquid resins, plasticizer oils or low molecular weight liquid polymers (low molecular weight silicone oils with weight average molecular weights M w of less than 1,500 g / mol).
  • Another object of the invention is a release liner containing a crosslinked composition according to the invention as a separating layer.
  • This separation layer is preferably on a carrier material (TS) applied, it being possible to use all coating processes familiar to the person skilled in the art.
  • TS carrier material
  • the carrier material (TS) can be coated on one or both sides with the composition according to the invention as a separating layer. Liners coated on both sides are particularly suitable for an adjacent winding on a bale or roll.
  • papers or foils are used as the carrier material (TS).
  • the films used are preferably those made from polyether sulfones, polysulfones, polyolefins and polyesters, in particular from biaxially stretched polyethylene terephthalate, polybutene, polypropylene, polyethylene, monoaxially stretched polypropylene and biaxially stretched polypropylene or polyethylene.
  • polyolefin films (polypropylene and polyethylene films) or polyester films are particularly preferably used as the carrier material (TS).
  • Polymer-coated papers or nonwovens can also be used.
  • the separating layer has a layer thickness of 0.1 to 5.0 pm, preferably 0.2 to 2.5 pm, in particular 0.4 to 2.0 pm.
  • the separating layer In order to enable the releasability of the release liner from the PSA of an adhesive tape, the separating layer must have a low surface energy. The release properties or cohesion must therefore be matched to the adhesive properties of the PSA of the adhesive tape.
  • the pull-off force serves as the central parameter that describes the detachment behavior. In order to achieve adequate adhesion of the release liner separating layer while handling the adhesive tape, pulling forces of at least 3 cN / cm are required. If the pulling force is lower, the liner may come off unintentionally during manufacture, storage and handling. On the other hand, however, a simple replacement of the release liner from to ensure the PSA, the release force must not be too high.
  • the separating layer has a pull-off force of 3 to 80 cN / cm, preferably of 4 to 40 cN / cm, in particular of 5 to 30 cN / cm, the pull-off force on a PE carrier plate by a Tensile test (machine speed 300 mm / min, pull angle 180 °, tesa 7475 or tesa 7476) is determined.
  • the deduction force is determined in the same way as the separation force described in the example section. However, in the case of the pull-off force, a pull-off angle of 180 ° is used.
  • the separating layer In order to prevent structuring of the surface of the PSA of an adhesive tape, which is connected to the surface of the liner, the separating layer must not have any surface structure.
  • the use of particles known in the prior art to reduce surface friction leads to a surface structure of the liner.
  • the addition of the monoalkenyl-functionalized polydimethylsiloxane in compositions for the production of release liners also results in reduced surface friction without surface structuring occurring.
  • Release liners preferred according to the invention are therefore characterized in that the separating layer has no surface structure.
  • Another object of the present invention is an adhesive tape containing at least one PSA and at least one release liner according to the invention, the PSA being covered on one or both sides with the release liner.
  • adhesive tape encompasses all flat structures as in two Dimensions of extended geometries, tapes of extended length and limited width, tape sections, labels, die cuts and the like.
  • the adhesive tape according to the invention can be designed to be strapless or with at least one carrier material. If a backing material is present, it can be provided with the PSA on one or preferably both sides or consist of it.
  • the carrier material comprises all flat structures, for example foils or foil sections expanded in two dimensions, ribbons with extended length and limited width, ribbon sections, die-cuts (for example in the form of borders or boundaries of an (opto) electronic arrangement), multilayer arrangements and the like.
  • substrates such as foils, fabrics, nonwovens and papers can be combined with the adhesives for various applications.
  • polymer films, film composites or films or film composites provided with organic and / or inorganic layers are preferably used as the carrier material of the adhesive tape.
  • Such films / film composites can consist of all of the common plastics used for film production, examples being: polyethylene, polypropylene - in particular the oriented polypropylene (OPP) produced by mono- or biaxial stretching, cyclic olefin copolymers (COC), polyvinyl chloride (PVC), polyester - In particular polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), ethylene vinyl alcohol (EVOH), polyvinylidene chloride (PVDC), polyvinylidene fluoride (PVDF), polyacrylonitrile (PAN), polycarbonate (PC), polyamide (PA), polyether sulfone (PES) or polyimide (PI ).
  • the carrier can also be combined with organic or inorganic coatings or layers. This can be done using conventional methods such as painting, printing, vapor deposition, sputtering, co-extrusion or lamination. Examples include oxides or nitrides of silicon and aluminum, indium tin oxide (ITO) or sol-gel coatings.
  • organic or inorganic coatings or layers This can be done using conventional methods such as painting, printing, vapor deposition, sputtering, co-extrusion or lamination. Examples include oxides or nitrides of silicon and aluminum, indium tin oxide (ITO) or sol-gel coatings.
  • ITO indium tin oxide
  • a pressure-sensitive adhesive is present in the adhesive tape as an adhesive, so that a one-sided adhesive tape results, in which the coating acts as a release agent.
  • Pressure-sensitive adhesives are adhesives that allow a permanent connection to the adhesive base even under relatively weak pressure and can be removed from the adhesive base after use, essentially without residue.
  • Pressure-sensitive adhesives have a permanent pressure-sensitive adhesive at room temperature, that is to say they have a sufficiently low viscosity and high tack, so that they wet the surface of the respective adhesive base even with slight pressure.
  • the adhesiveness of the adhesives is based on their adhesive properties and the releasability on their cohesive properties.
  • Various connections can be used as the basis for PSAs.
  • PSAs as advantageous in the sense of this invention: acrylate, silicone, natural rubber, synthetic rubber,
  • Styrene block copolymer compositions with an elastomer block made of unsaturated or hydrogenated polydiene blocks (polybutadiene, polyisoprene, copolymers of both and other elastomer blocks known to the person skilled in the art) and further pressure-sensitive adhesive compositions which are known to the person skilled in the art, for which in particular silicone-containing release coatings can be used.
  • elastomer block made of unsaturated or hydrogenated polydiene blocks (polybutadiene, polyisoprene, copolymers of both and other elastomer blocks known to the person skilled in the art) and further pressure-sensitive adhesive compositions which are known to the person skilled in the art, for which in particular silicone-containing release coatings can be used.
  • pressure-sensitive adhesives based on acrylate are mentioned, then pressure-sensitive adhesives based on methacrylates and on the basis of acrylates and methacrylates are included without explicit mention, unless expressly described otherwise.
  • the carrier of the adhesive tape is coated on one side with the preferred pressure sensitive adhesive from solution or dispersion or 100% (for example melt) or by coextrusion. Alternatively, coating by transfer of an adhesive layer by lamination is possible.
  • the adhesive layer (s) can be cross-linked by heat or high-energy radiation.
  • the self-adhesive used with one or more additives such as tackifiers (resins), Plasticizers, fillers, pigments, UV absorbers, light stabilizers, anti-aging agents, cross-linking agents, cross-linking promoters or elastomers can be mixed.
  • tackifiers resins
  • Plasticizers fillers, pigments, UV absorbers, light stabilizers, anti-aging agents, cross-linking agents, cross-linking promoters or elastomers
  • the amount of the adhesive layer is preferably 10 to 120 g / m 2 , preferably 25 to 100 g / m 2 (what is meant is the amount after removal of water or solvent that may be necessary; the numerical values also correspond approximately to the thickness in pm).
  • a physical pretreatment of the carrier side to be coated with pressure-sensitive adhesive is advantageous in order to improve the adhesion, for example by flame, plasma or corona treatment.
  • a primer layer in particular solvent-free, such as by coextrusion, can be applied to the carrier before the pressure-sensitive adhesive layer is applied, so that a primer layer is located between the carrier layer and a pressure-sensitive adhesive layer.
  • the known dispersion and solvent systems can be used as primers, for example based on isoprene- or butadiene-containing rubbers and / or cyclo-rubbers. Isocyanates or epoxy resins as additives improve the adhesion and in some cases also increase the shear strength of the pressure-sensitive adhesive. Physical surface treatments such as flame treatment, corona or plasma or coextrusion layers are also suitable for improving the adhesion.
  • the PSA has an adhesive strength depression (KKD) of 0 to 30%, preferably 0 to 20%, in particular 0 to 15%, the adhesive strength depression (KKD) on a steel surface a reference sample by a Tensile test (machine speed 300 mm / min, pull angle 180 °) using the following formula
  • the reference sample is a pressure sensitive adhesive which, prior to determining the adhesive strength by means of a tensile test, was not in contact with the release coating of the release liner.
  • the present invention also relates to the use of monovinyl-functionalized polydimethylsiloxane in silicone-containing release liners to reduce the coefficient of friction of the separating layer.
  • the present invention relates to a composition for producing a release coating, in particular for finishing a release liner, comprising:
  • the present invention relates to a composition according to embodiment 1, characterized in that the organopolysiloxane a) has a weight-average molecular weight M w of 1,000 to 60,000 g / mol, the weight-average molecular weight M w by gel permeation chromatography in toluene at 23 ° C and a flow rate of 1.0 ml / min using a modified styrene-divinylbenzene copolymer network as the column material and polydimethylsiloxane as the internal standard
  • the present invention relates to a composition according to one of the embodiments 1 or 2, characterized in that the monoalkenyl-functionalized polydimethylsiloxane c) is a linear or branched, in particular linear, monovinyl-functionalized polydimethylsiloxane.
  • the present invention relates to a composition according to one of the preceding embodiments, characterized in that the composition contains component c) in a vinyl content of 0.01 to 10 mol%, preferably 0.02 to 8 mol% , preferably from 0.03 to 5 mol%, in particular from 0.1 to 4 mol%, in each case based on the molar total vinyl group content of components a) and c).
  • the present invention relates to a composition according to one of the preceding embodiments, characterized in that the composition comprises component a) in a total amount of 72 to 91 parts by weight, component b) in a total amount of 3 to 8 parts by weight and component c ) in a total of 1 to 23 parts by weight, based in each case on the sum of components a), b) and c) of 100 parts by weight.
  • the present invention relates to a composition according to one of the preceding embodiments, characterized in that the catalyst is selected from platinum or rhodium catalysts and preferably in a total amount of 40 to 600 ppm, calculated as platinum or rhodium metal and based on the Sum of components a), b) and c) of 100 parts by weight is used.
  • the catalyst is selected from platinum or rhodium catalysts and preferably in a total amount of 40 to 600 ppm, calculated as platinum or rhodium metal and based on the Sum of components a), b) and c) of 100 parts by weight is used.
  • the present invention relates to a composition according to one of the preceding embodiments, characterized in that the composition is solvent-free.
  • the present invention relates to a release liner containing a crosslinked composition according to at least one of the preceding claims as a separating layer.
  • the present invention relates to a release liner according to embodiment 8, characterized in that the separating layer has a layer thickness of 0.1 to 5.0 pm, preferably 0.2 to 2.5 pm, in particular 0.4 to 2 , 0 pm.
  • the present invention relates to a release liner according to one of the embodiments 8 or 9, characterized in that the separating layer has a pull-off force of 3 to 80 cN / cm, preferably 4 to 40 cN / cm, in particular 5 to 30 cN / cm, the pull-off force on a PE carrier plate being determined by a tensile test (machine speed 300 mm / min, pull-off angle 180 °, tesa 7475 or tesa 7476).
  • the present invention relates to a release liner according to one of the embodiments 8 to 10, characterized in that the separating layer has no surface structure.
  • the present invention relates to an adhesive tape containing at least one PSA and at least one release liner according to one of the embodiments 8 to 11, the PSA being covered on one or both sides with the release liner.
  • the present invention relates to an adhesive tape according to embodiment 12, characterized in that the PSA has an adhesive force depression (KKD) of 0 to 30%, preferably 0 to 20%, in particular 0 to 15%, the Adhesive force depression (KKD) on a steel surface compared to a reference sample by means of a tensile test (machine speed 300 mm / min, peel angle 180 °) using the following formula
  • the present invention relates to the use of monovinyl-functionalized polydimethylsiloxane in silicone-containing release liners to reduce the coefficient of friction of the separating layer.
  • Release liners were produced on a glassine paper (Silca ind. 2S white SCO 90 g from Ahlström) by applying the release coating compositions specified below using a laboratory coating system.
  • the coating weight was 1.0 g / m 2 .
  • the separation systems were crosslinked in a forced air oven at 160 ° C for 30 s.
  • the release liners produced in this way were examined with regard to their surface friction, the adhesive force depression, the change in the peel forces (tesa® 7475 and tesa® 7476) as well as the liner structure and the structure transfer to the PSA of the adhesive tape.
  • the tesa® 7475 test tape is a 36 ⁇ m thick PET carrier coated with 95 g / m 2 of a resin-modified acrylate PSA.
  • the tesa® 7476 test tape uses a mass application of 130 g / m 2 of a natural rubber pressure sensitive adhesive on a 160 g / m 2 thick backing.
  • the release liners produced were stuck with two different adhesive tapes. For this purpose, 20 mm wide and 300 mm long strips of the tesa® 7475 and tesa® 7476 test tapes were glued to the respective release liner. For each sample, 3 laminates of liner with tesa® 7475 test tape and liner with tesa® 7476 test tape were stored under pressure and temperature for 24 hours. The temperature during storage was 40 ° C. for the tesa® 7476 test tape and 70 ° C. for the tesa® 7475 test tape. The pressure was 4 N / cm 2 in both cases. After the subsequent storage of the samples for 2 hours in an air-conditioned measuring room at 23 ° C.
  • the respective sample was clamped in a tensile testing machine (BZ2.5 / TN1 S, from Zwick).
  • the extended end of the mounting material was clamped in the upper jaw and pulled off at a machine speed of 300 mm / min at an angle of 90 °.
  • a test tape was tesa 7475, which previously to measure the release behavior for 24 h at pressure and temperature, with the liner mounted also adhered to steel and the adhesive strength measured by a tensile test (corresponds to the value Klebkraftp robe).
  • the adhesive force depression (KKD) was then calculated using the following equation: 100%
  • the samples coated with the separation system were evaluated in a direct comparison by five test subjects.
  • the basis for the evaluation is the feeling on the skin when the liner coated with the separating system is applied by hand under greater pressure - in other words, the usual methods for applying pressure-sensitive adhesives known to the person skilled in the art.
  • the rating scale goes from 1 to 6, with a lower score means a more pleasant feeling on the skin.
  • Each test person should rate the sample with the most pleasant skin feeling with 1 and the sample with the most unpleasant skin feeling with 6. All other samples are evaluated relative to these according to the respective skin feel. The mean of the ratings of the various test subjects was calculated for evaluation.
  • GPC Gel Permeation Chromatography
  • the weight-average molecular weights (M w ) of the organopolysiloxanes and silicone resins used can be determined by means of GPC. The following settings were used for the determination: eluent toluene; Measuring temperature 23 ° C; Guard column PSS-SDV, 5 pm, 10 2 A (10 nm), ID 8.0 mm x 50 mm; Separation: columns PSS-SDV, 5 pm, 10 2 A (10 nm), and 10 3 A (100 nm), and 10 6 A (105 nm), each with ID 8.0 mm x 300 mm; Sample concentration 3 g / l, flow rate 1.0 ml per minute; Polydimethylsiloxane standards.
  • Example 1 Silicone systems with and without monovinyl-functionalized polydimethylsiloxane
  • Addition-crosslinking silicone systems were used as silicone systems, which include a PDMS-based release base polymer (SL 100 or SL 200 - component a), an Si-H crosslinker (Syl-Off 7672 - component b) and a platinum catalyst (Syl-Off 4000 - component d) included.
  • a PDMS-based release base polymer SL 100 or SL 200 - component a
  • an Si-H crosslinker Syl-Off 7672 - component b
  • a platinum catalyst Syl-Off 4000 - component d
  • Different proportions of monovinyl-functionalized polydimethylsiloxane (component c) - additive A or B) were added to each of these systems (see Table 1) and the mixtures obtained were homogenized. All silicone compositions were coated on a glassine paper (Silca ind. 2S white SCO 90 g from Ahlström) using a laboratory coating machine with a silicone application of 1.0 g /
  • A linear, monovinyl functionalized polydimethylsiloxane
  • B branched monovinyl functionalized polydimethylsiloxane
  • Grade 1 very pleasant skin feeling
  • Grade 6 very uncomfortable skin feeling
  • Silicone system S1 contains 9.03 g PDMS-based release base polymer SL 100 (component a), 0.77 g Si-H crosslinker Syl-Off 7672 (component b) and 0.20 g platinum catalyst Syl-Off 4000 ( Component d). 0.22 g of PMMA particles were added to this system and the mixture was homogenized.
  • Silicone system S2 contains 9.34 g PDMS-based release base polymer SL 200 (component a), 0.46 g Si-H crosslinker Syl-Off 7672 (component b) and 0.20 g platinum catalyst Syl-Off 4000 ( Component d). 0.23 g of PMMA particles were added to this system and the mixture was homogenized.
  • Table 3 Results of the determination of surface friction and adhesive force depression as well as the change in the peel forces (tesa 7475 and tesa 7476) as a function of the additive content
  • Grade 1 Grade 1: very pleasant skin feeling
  • Grade 6 very uncomfortable skin feeling
  • the addition of the additive not in accordance with the invention in the form of PMMA particles leads to a reduced coefficient of friction and to a low adhesive force depression, but due to the use of particles the liners have a structure which is transferred to the PSA of the adhesive tape and in the processing process or during the application is undesirable.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Adhesive Tapes (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention concerne des compositions silicone à réticulation par addition qui contiennent au moins un polydiméthylsiloxane à fonctionnalité monoalkényle. La présente invention concerne en outre une pellicule de protection anti-adhérente qui contient la composition silicone réticulée ainsi qu'un ruban adhésif pour lequel la matière auto-adhésive est revêtue d'un côté ou des deux côtés par la pellicule de protection anti-adhérente selon l'invention. Enfin, la présente invention concerne l'utilisation de polydiméthylsiloxanes à fonctionnalité monovinyle dans des pellicules de protection auto-adhérentes à base de silicone pour réduire le coefficient de frottement de la couche de séparation.
PCT/EP2019/081466 2018-11-23 2019-11-15 Composition pour un revêtement de séparation à faible coefficient de frottement WO2020104316A1 (fr)

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DE102018220199.4A DE102018220199A1 (de) 2018-11-23 2018-11-23 Zusammensetzung für eine Trennbeschichtung mit niedrigem Reibungskoeffizienten
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US4725630A (en) 1987-06-01 1988-02-16 Wacker Silicones Corporation α, β-unsaturated carbonyl-functional silicone compositions
DE3820294C1 (fr) 1988-06-15 1989-10-05 Th. Goldschmidt Ag, 4300 Essen, De
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WO2010022154A2 (fr) 2008-08-19 2010-02-25 3M Innovative Properties Company Matériaux de libération
EP2025507B1 (fr) 2007-08-13 2010-12-22 Tesa Se Produit de séparation à base de blocs multiples de copolymères d'éthylène
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EP0168713B1 (fr) 1984-07-14 1991-09-11 Th. Goldschmidt AG Organopolysiloxanes modifiés avec des esters d'acide (meth)acrylique, leur préparation et application comme compositions de revêtement décollables
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DE3820294C1 (fr) 1988-06-15 1989-10-05 Th. Goldschmidt Ag, 4300 Essen, De
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WO2010022154A2 (fr) 2008-08-19 2010-02-25 3M Innovative Properties Company Matériaux de libération
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US20120322937A1 (en) 2011-06-17 2012-12-20 Tesa Se Release coating with low friction coefficient
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DE102018220199A1 (de) 2020-05-28

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