WO2016071232A1 - Procédé de traitement par plasma indirect de couches anti-adhérentes - Google Patents

Procédé de traitement par plasma indirect de couches anti-adhérentes Download PDF

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Publication number
WO2016071232A1
WO2016071232A1 PCT/EP2015/075282 EP2015075282W WO2016071232A1 WO 2016071232 A1 WO2016071232 A1 WO 2016071232A1 EP 2015075282 W EP2015075282 W EP 2015075282W WO 2016071232 A1 WO2016071232 A1 WO 2016071232A1
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WO
WIPO (PCT)
Prior art keywords
release
release layer
plasma gas
plasma
adhesive
Prior art date
Application number
PCT/EP2015/075282
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German (de)
English (en)
Inventor
Nikolay BELOV
Marcel Hähnel
Arne Koops
Hermann Neuhaus-Steinmetz
Dennis Perlbach
Tobias Winkler
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 EP15797025.2A priority Critical patent/EP3215581A1/fr
Publication of WO2016071232A1 publication Critical patent/WO2016071232A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
    • H01J37/32357—Generation remote from the workpiece, e.g. down-stream
    • 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
    • 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
    • C09J7/401—Adhesives in the form of films or foils characterised by release liners characterised by the release coating composition
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/47—Generating plasma using corona discharges
    • 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 a process for the indirect plasma treatment of a release layer, comprising the steps of (i) introducing a plasma gas into a discharge space; (ii) exciting the plasma gas into a plasma state by discharge;
  • the present invention further relates to release layers obtainable by the method described herein, as well as release liners comprising a support and the release layer. Also described are adhesive tapes comprising the release liner described herein and an adhesive.
  • Adhesive tapes are often wound into a roll in the form of an Archimedean spiral at the end of the manufacturing process.
  • the adhesive is covered before winding the adhesive tape with a release liner (also referred to as release or covering).
  • Release liners are also used for covering flat goods such as labels.
  • release liners can be adjusted in such a way that one side of the adhesive tape is first exposed during the unwinding of the tape. This is possible if the release values between the respective release layer and the adhesive on the individual sides of the double-sided adhesive tape differ from one another.
  • release liners paper or film carriers are used, which are equipped with a release layer in order to reduce the adhesion tendency of adhering products to these surfaces (release-effective function).
  • the release agents used are various substances such as silicones, fluorinated silicones, fluorinated alkanes and polyolefins, silicone copolymers, carbamates, waxes or mixtures thereof. Silicones have largely prevailed over the last few years due to their good processability and advantageous release properties. Due to the large number of different compositions, silicones can also be used to adjust the release values of release liners.
  • the level of the respective peel force of a pressure-sensitive adhesive of a silicone-based release liner is usually adjusted by silicone resins and in particular by so-called MQ resins. D.
  • a specific silicone composition must be selected for each desired release force coated on a carrier and cured. This makes it necessary to use and also stockpile multiple release liners with different MQ resin contents when there is a need for different release properties. Due to the large variety of different adhesive composition such storage is hardly feasible. Furthermore, the use of many different coating compositions can lead to increased waste material, since the individual coating compositions can not be permanently stored. Instead, the particular coating composition must be prepared just prior to application.
  • the separation force profile is the dependence of the release force on the withdrawal speed of the release liner from the adhesive.
  • the force required to remove a release liner from an adhesive increases (or decreases) in the range of low take-off speeds (from 0 to, for example, 20 m / min) with increasing take-off speed before a release force sets in which is only slightly lower than the take-off force depends.
  • the release force increases in the range of low take-off speeds (rising profile) or decreases (sloping profile) depends on the content of MQ resin in the formulation. For high resin contents, sloping profiles are often observed and for low resin contents frequently rising profiles.
  • the separating force profile may be reversed in the release force profile.
  • the profile of the release force profile in silicone resin-containing formulations is difficult to predict, especially in the range of low take-off speeds. For example, it has been observed that in the low pull-off rate range of 0-20 m / min, the release values are high in the case of high MQ resin concentration and decrease with increasing drawdown speed, although the release values are low at low draw speeds for low MQ resin or resin free formulations and usually increase slightly with increasing take-off speed.
  • the object of the present invention is to address the disadvantages of the prior art and to provide an improved physical process by means of which the release values of release liners can be adjusted in a targeted manner even for strongly tacky products , without there being a significant change in the course of the release force profile over one untreated liner (reference liner) or excessive interaction between the corona-treated surface and the adhesive due to over-treatment.
  • the present invention addresses this problem and the problems of the prior art by providing a physical process for the indirect plasma treatment of a release layer, comprising the steps of: introducing a plasma gas into a discharge space;
  • the indirect plasma treatment in relation to the standard plasma treatment has a very low efficiency, which can be reduced by suitable measures again.
  • the indirect plasma treatment is particularly suitable for the generation of low treatment effects.
  • the blowing out of the plasma gas takes place in a plasma state from the discharge space by a plasma gas flow.
  • the plasma gas is excited into a plasma state via an electrical high voltage having a frequency of 2000 to 100,000 Hz, wherein the high voltage is switched on and off with a switching frequency of 30 to 5000 Hz.
  • the present invention further relates to a release layer obtainable by the process according to the invention; Release liner, comprising a support and the release layer obtainable by the process according to the invention; and an adhesive tape comprising the release liner and an adhesive in contact with the release liner release layer.
  • a plasma gas is excited with a high voltage electrical discharge.
  • an electrode or an electrode system by a high-frequency generator with an AC voltage of about 5-50 kV, and a frequency between 2 and 100 kHz, preferably supplied between 18-100 kHz.
  • the high-voltage discharge occurs in a discharge space between an electrode system lying at a high electrical potential (also referred to below as the electrode system) and a counterelectrode, which is usually at ground potential.
  • the discharge space is understood to be the region between the electrode system and the counterelectrode.
  • either the electrode system or the counter electrode is coated with a high-voltage resistant insulator.
  • an insulator is preferably a layer of silicone rubber, ceramic or glass in question.
  • both the electrode system and the counter electrode can be coated with such a high-voltage resistant insulator.
  • the inventive method for indirect plasma treatment is preferably carried out at atmospheric pressure.
  • atmospheric pressure the present invention means a pressure of 0.5 to 2 times the ambient pressure, preferably 0.75 to 1.5 times, more preferably 0.9 to 1.2 times the ambient pressure
  • the present invention also speaks of indirect “atmospheric pressure plasma treatment”, which is also referred to herein as indirect “corona treatment”.
  • the plasma gas is blown out of the discharge space after being excited, in order to expose a release layer to the plasma gas in a plasma state.
  • the blowing out takes place in this case preferably by a stream of the plasma gas.
  • the plasma gas is thus preferably first passed into the discharge space between the electrode system and the counter electrode, excited in a plasma state and then led out in a plasma state from the discharge space.
  • the introduction of the plasma gas takes place in the electrode space and carrying out the plasma gas after exciting in a plasma state from the electrode chamber preferably continuously.
  • the electrons emerging from the electrode experience a high acceleration in the electric field between the electrode system and the counter electrode. It is assumed that portions of the energy in collisions are delivered to the molecules of the plasma gas, in the case of air as a plasma gas so mainly to oxygen and nitrogen molecules. In the case of air, this leads to a dissociation or ionization of mainly oxygen and nitrogen molecules.
  • corona discharge When the plasma gas is excited into a plasma state by discharge (also referred to as "corona discharge” in the case of atmospheric pressure plasma treatment), a plurality of arcs are produced
  • the corona discharge which occurs when the plasma gas is excited into a plasma state as a result of discharge, is therefore also referred to as a barrier discharge.
  • the plasma gas in a plasma state is passed out of the discharge space through an opening, for example through a slot, the opening preferably extending over the entire width of the release layer to be treated.
  • An opening extending across the width of the surface to be treated has the advantage that a uniform treatment over the entire width of the surface can be ensured.
  • the intensity of the treatment effect can also be varied.
  • the intensity of the treatment effect can also be determined by the distance between the outlet opening of the plasma gas in a plasma state from the discharge space and the surface of the plasma control the release layer to be treated.
  • the distance between the outlet opening and the release layer to be treated is about 1 -10 mm.
  • web speed is understood to mean the speed at which the release layer to be treated is passed through the plasma gas blown out of the discharge space.
  • the web speed may be zero or may be in a range of greater than zero to 500 m / min and more.
  • a facility for handling a release layer is designed so that it is not the rate-limiting factor in an overall facility.
  • the release layer applied, for example, to a support can be guided through the treatment zone without a counter-roller on the back of the support, so that the side of the release layer facing the discharge opening of the discharge space is treated.
  • the treatment effect is much lower than when a guide of the carrier on a counter-roller through the treatment room, which is contrary to a desired low treatment effect.
  • a release layer also experiences a treatment on the side of the carrier facing away from the discharge opening of the discharge space, but this treatment is always significantly lower than the release layer facing the discharge opening of the discharge space.
  • the release layer applied, for example, to a carrier can be guided over a roller so that the release layer facing the outlet opening of the discharge space is treated.
  • Air between the roller and the carrier can also cause an undesirable treatment effect on the back of the carrier.
  • the plasma gas is excited into a plasma state via an electrical high voltage having a frequency of 2000 to 100,000 Hz, wherein the high voltage is switched on and off with a switching frequency of 30 to 5000 Hz.
  • the invention strives for uniform treatment effects over the entire electrode width of the corona or plasma system.
  • a relatively high minimum electrical power P m in is needed for a uniform discharge across the width of the electrodes in the case of a pulsed excitation of the plasma gas.
  • This minimum electrical power is typically one-fifth to one-tenth of the maximum useful generator power for a particular electrode design.
  • the treatment effect in the case of release layers despite the indirect plasma treatment in a continuous plasma discharges sometimes at low web speeds without the measures described above at the exit slit to reduce the treatment effect is still so pronounced that even at the lowest possible treatment strength separation forces against strongly pressure-sensitive adhesives
  • strongly tacky acrylate adhesives are achieved which make it difficult to use the treated surface as a release layer with particularly low release forces for such an adhesive, in particular if a larger speed range is to be covered.
  • the power of the corona generator must also change by a factor for a constant treatment dose.
  • Normal unpulsed treatment stations can only cover a factor of 5 to 10 in the power range. Often there is also the requirement that even with a train stop no over- and no sub-treatments arise, whereby the required power range is again significantly expanded to very small benefits.
  • This aspect of the invention is based on the finding that the limit for the minimum treatment effect can be reduced by pulses (rapid periodic switching on and off) of the high-frequency discharge, preferably by pulsing the corona discharge.
  • an electrical power P is set equal to or above the minimum power of the plasma unit Pmin during the switch-on, so that during this time a homogeneous discharge, preferably a homogeneous corona discharge, is ensured across the width of the electrodes.
  • Pulses can be used to reduce the minimum effective electrical power for uniform treatment across the web width to less than 1% of the minimum electrical power without pulses. In the unpulsed state, the power in a treatment station can be varied by a factor of 5 -10 for sensible use.
  • the effective power can be varied by a factor of about 500.
  • a safe ignition over the entire web width occurs at each pulse, as long as the power during the on-time is at least as large as the minimum power Pmin for a uniform treatment across the web width.
  • the effective electric power Peffective of a pulsed discharge results from the ratio of the turn-on ti to repetition time T and from the power P during the turn-on time.
  • the repetition time T is varied at a fixed on-time ti for adjusting the effective power.
  • the repetition time T can be varied at a fixed switch-on time ti.
  • both the on time and the reheat time are varied simultaneously.
  • the discharge i. the excitation of the plasma gas in a plasma state
  • pulse width modulated In the case of pulse width modulation ("PWM"), the on-time t.sub.i is varied at a fixed recovery time T.
  • the on-time t.sub.i is preferably 0.002 to 33 ms.
  • the dose can be regulated at a certain engine speed so that the resulting dose D corresponds to the target dose D so n.
  • the dose to which the release layer is exposed in the method according to the invention is 0.01 -6, preferably 0.01-3 W * min / m 2 .
  • the separation behavior of the release layers described herein can be adjusted in a targeted manner, without reversing the course of the release force profile in the region of low take-off speeds.
  • the release force of the treated release layer with respect to a particular adhesive surface increases with increasing treatment dose.
  • the inventive method allows the treatment of release layers with a plasma discharge such that the treated release layers are also suitable as release materials against strongly adhesive surfaces such as acrylate-based PSAs.
  • the method according to the invention allows the provision of release layers whose release forces are in the range from 2 to 100 cN / cm in relation to strongly adhesive adhesives.
  • an atmosphere also referred to herein generally as a "plasma atmosphere” and, in the case of corona treatment, as a “corona atmosphere"
  • a plasma atmosphere also referred to herein generally as a "plasma atmosphere” and, in the case of corona treatment, as a “corona atmosphere”
  • the inventive method allows a particularly gentle, yet uniform treatment of the release layer. Such a gentle treatment with a comparatively low treatment effect would not be possible in the case of an unpulsed conventional plasma treatment and would not allow the provision of release layers with particularly low separation forces.
  • the plasma gas consists of nitrogen, carbon dioxide, argon, helium, air or a mixture of two or more of these gases.
  • the plasma gas may further contain hydrogen.
  • the release layer is applied to a carrier.
  • the support is over the entire surface, ie covering and not only selectively covered by the release layer, so that the thickness of the release layer is preferably in a range of 0.05 - 5 ⁇ .
  • the release layer contains at least one silicone, at least one fluorinated silicone, at least one fluorinated or partially fluorinated alkane or polyolefin, at least one silicone copolymer, at least one carbamate, at least one wax, or mixtures of two or more of the mentioned substances.
  • the release layer is particularly preferably silicone-based.
  • silicone-based in the sense of the present invention means that the release layer contains at least one silicone-based polymer (hereinafter also "base polymer").
  • the base polymers used are polysiloxanes, preferably functionalized and unfunctionalized polydimethylsiloxanes.
  • the composition underlying the release layer contains up to 80 parts by weight, more preferably up to 40 parts by weight of a silicone resin, based on 100 parts by weight of silicone resin and base polymer.
  • Suitable silicone resins are known resins, preferably MQ resins. Suitable resins are described in D. Statas in: Handbook of Pressure Sensitive Adhesive Technology, 3rd Edition, page 664. Commercially available examples of particularly preferred resins are RCA 395 from Bluestar Silicones, Syl- Off® SL 40 from Dow Corning, and CRA® 17 from Wacker Silicones.
  • the composition underlying the release layer is free of silicone resins.
  • the release layer to be treated by the method according to the invention can be based on solvent-containing and / or solvent-free systems.
  • a "solvent-containing system” means that the system concerned is applied as an actual solvent-containing system, after which, however, only a maximum of traces of the solvent in the release layer are present after thermally initiated drying and crosslinking System "and thus indicates the special properties of such a solvent-based release layer.
  • the composition on which the release layer is based can be radiation-crosslinking (UV or electron beam), condensation-curing or addition-crosslinking.
  • the composition which forms the release layer to be treated is preferably addition-curing.
  • the composition underlying the release layer is preferably a crosslinkable silicone system.
  • crosslinkable silicone system include mixtures of crosslinking catalysts, so-called thermally curable condensation or addition-crosslinking polysiloxanes and crosslinking component.
  • crosslinking catalysts so-called thermally curable condensation or addition-crosslinking polysiloxanes
  • crosslinking component for condensation-crosslinking silicone systems, tin compounds such as dibutyltin diacetate are frequently included in the composition as crosslinking catalysts.
  • composition underlying the release layer is particularly preferably an addition-crosslinking silicone system.
  • Silicone-based release coatings on addition-curing basis can be cured by hydrosilylation.
  • These release agents usually comprise the following components:
  • alkenylated polydiorganosiloxane especially linear and branched polymers containing terminal and non-terminal alkenyl groups
  • hydrosilylation catalyst • a hydrosilylation catalyst.
  • platinum or platinum compounds such as, for example, the Karstedt catalyst (a Pt (O) complex compound) have prevailed.
  • Karstedt catalyst a Pt (O) complex compound
  • rhodium compounds can be used.
  • photoactive catalysts so-called photoinitiators
  • UV-curable cationically crosslinking siloxanes based on epoxide and / or vinyl ethers
  • UV-curable free-radical crosslinking siloxanes such as acrylate-modified siloxanes.
  • electron beam curable silicones e.g., silicone acrylates
  • Corresponding systems may also contain other additives, such as stabilizers or leveling agents, depending on the intended use.
  • compositions in which the crosslinking reaction between organopolysiloxanes having hydrocarbyl substituted with mercapto groups bonded directly to the silicon atoms and organopolysiloxanes having vinyl groups bonded directly to the silicon atoms are described for example in US 4,725,630 A1.
  • organopolysiloxane compositions described, for example, in DE 33 16 166 C1 which have epoxy groups substituted hydrocarbon radicals bonded directly to the silicon atoms
  • the crosslinking reaction is induced by release of a catalytic amount of acid which is obtained by photodecomposition of added onium salt catalysts.
  • Other cationic-mechanism-curable organopolysiloxane compositions are materials having, for example, propenyloxysiloxane end groups.
  • composition on which the release layer to be treated according to the invention is based further constituents such as anchoring aids; organic and / or inorganic pigments; Fillers such as carbon black and organic and / or inorganic particles (eg polymethylmethacrylate (PMMA), barium sulphate or titanium oxide ( ⁇ 2)); and organic and / or inorganic antistatics such as ionic polyelectrolytes, organic salts, ionic liquids, metal powders (eg silver powder), graphite and carbon nanotubes may be included.
  • anchoring aids eg polymethylmethacrylate (PMMA), barium sulphate or titanium oxide ( ⁇ 2)
  • organic and / or inorganic antistatics such as ionic polyelectrolytes, organic salts, ionic liquids, metal powders (eg silver powder), graphite and carbon nanotubes
  • the composition on which the release layer to be treated according to the invention is based in each case independently 0 to 5 parts by weight of one or more anchoring aids, one or more pigments, one or more fillers, and one or more antistatic agents, respectively based on 100 parts by weight of base polymer and silicone resin.
  • the inventive method is suitable for targeted adjustment of the release forces of release liners.
  • the indirect plasma treatment as described herein, makes it possible to increase the separation forces without significantly changing the release force profile, ie the course of the release force as a function of the withdrawal speed, of the (untreated) release layer.
  • the method according to the invention allows the provision of release liners in which the absolute release force values can be set without significant change in the release force profile as a function of the dose.
  • the present invention also relates to release layers, which are obtainable by the process according to the invention, and release liners, comprising a support and a release layer.
  • this support is selected from the group consisting of polyethylene terephthalate (PET), polybutylene, polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC) and paper.
  • Particularly preferred supports are glassine papers, clay-coated papers, Kraft papers, machine-grade papers and polyolefin-coated papers, and biaxially stretched PET, mono- and biaxially drawn PP, cast PP (extruded PP), HDPE and LDPE.
  • suitable carriers which are provided with a release layer and are particularly suitable for treatment with the method according to the invention are siliconised glassine papers from Mondi (G-Liner), siliconized polyolefin-coated papers from Loparex (Polyslik TM), siliconized PET films from Siliconature (SILPHAN S), siliconized mono- and biaxially stretched PP films, as well as cast aluminum films from Siliconature (SILPROP S, SILPROP M, SILPROP K) and siliconized HDPE and LDPE films from the company Mondi.
  • the present invention relates to adhesive tapes comprising a release liner whose release layer has been treated by the method described herein.
  • at least one side of the adhesive of the adhesive tape is in contact with the release layer obtainable by the process according to the invention.
  • the present invention relates to adhesive tapes in which the adhesive which is in contact with the release liner of the invention comprises an acrylate-based adhesive, preferably an acrylate-based adhesive having a bond strength to steel of 1 to 20, particularly preferably 5 Is -15 N / cm.
  • the coating weight of the adhesive is 50 g / m 2.
  • the adhesive forces on steel mentioned herein are as follows determined: A 2 cm wide and 25 cm longer strip of adhesive tape is glued on the test plate by five times double rollover with the winding speed of 10 m / min using a 4 kg roll. The test plate is clamped in the lower clamping jaw of the tensile testing machine (BZ2.5 / TN1 S Zwick) and the adhesive tape is stretched over its free end by means of a tensile testing machine (BZ2.5 / TN1 S Zwick) at a peeling angle of 180 ° at a speed of 300 mm / min deducted. The necessary force is determined. The measurement results are averaged over three measurements and normalized to the width of the strip in N / cm.
  • the adhesive which is in contact with the release liner of the release liner of the adhesive tape described herein has a maximum proportion of acrylic acid and methacrylic acid (hereinafter also “(meth) acrylic acid content”) 5, preferably 3, more preferably 1 percent by weight, based on the total composition of the adhesive, by which is meant that the proportion of acrylic acid and methacrylic acid units in the adhesive composition together does not exceed the stated values.
  • Units “includes both copolymerized acrylic acid and methacrylic acid within possible (sticky) sticky polymers of the adhesive as well as a possible (residual) monomer content of acrylic acid and methacrylic acid in the composition. In other words, the proportion of polymerized acrylic acid and methacrylic acid units and possible residual monomers in its sum does not exceed the maximum proportions mentioned.
  • a double-sided siliconized PE-coated glassine release paper with a width of 330 mm was used on a plasma system from VITO for indirect plasma treatment (Plasma line), in which the discharge is generated between two electrodes arranged above the treated silicone layer of the release paper, exposed to a plasma gas in a plasma state.
  • the flow of the plasma gas was adjusted so that the plasma gas (nitrogen with a residual oxygen content of 5 ppm) after being excited into a plasma state is pressed out of the discharge space in the direction of the release paper arranged below the electrodes.
  • the release paper was moved at a web speed of 12 m / min to 100 m / min relative to the exit port of the plasma gas in a plasma state.
  • the power of the corona system was set to 1000 watts for this indirect treatment.
  • the gap between the housing with the electrodes and the release paper was 6 or 8 mm.
  • the calculation of the treatment dose is carried out according to the formula (1).
  • the release force of the pretreated release papers is determined by bonding with three test strips each 20 mm wide.
  • the test strips used are test tapes with the product numbers tesa 7475 and tesa 7476.
  • Tesa 7475 is an adhesive tape with a PET film as a carrier, on which an acrylate compound is applied (adhesion to steel 12.5 N / cm).
  • Tesa 7476 is an adhesive tape with a fabric tape as a support on which a natural rubber adhesive is applied (bond strength to steel 8 N / cm).
  • the samples are stored for 24 hours at 70 ° C for tesa 7475 and at 40 ° C for tesa 7476 under a weight load of the bond of 2 N / cm 2 before the measurement.
  • test strips are cut to a length of 220 mm and stored for two hours under test conditions.
  • the upper test strip of the bond is clamped in the upper jaw of a tensile testing machine, as used in AFERA 4001.
  • the lower test strip is clamped in the lower jaw.
  • the jaw distance is 50 mm.
  • the measurement is made at a speed of 300 mm / min, with which the jaws are moved apart.
  • the mean value, determined over a distance of 100 mm, from three measurements of the force required for the separation of the bond corresponds to the release force.
  • the measurements are carried out at a test climate of 23 ⁇ 1 ° C and 50 ⁇ 5% rel. Humidity carried out.
  • the measured release force of the indirect corona treated release paper is shown in Table 1.
  • Table 1 Release force against acrylic adhesive tape tesa 7475 and natural rubber adhesive tape tesa 7476.
  • a double-sided siliconized glassine release paper with a width of 300 mm was applied to a corona system from VITO for indirect plasma treatment (plasma line), in which the discharge is produced between two electrodes arranged above the silicon layer of the release paper to be treated, a plasma gas Exposed to plasma state.
  • the flow of the plasma gas was adjusted so that the plasma gas (nitrogen with a residual oxygen content of 5 ppm) after being excited into a plasma state is pressed out of the discharge space in the direction of the release paper arranged below the electrodes.
  • the release paper was moved at a web speed of 25 m / min to 200 m / min relative to the exit port of the plasma gas in a plasma state.
  • the performance of the corona plant was for this indirect treatment is set to 1000 watts.
  • the gap between the housing with the electrodes and the release paper was 4 mm.
  • the calculation of the treatment dose is carried out according to the formula (1).
  • the measurement of separation forces was carried out as described for Examples 1-8. The measured separation forces are listed in Table 2.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Analytical Chemistry (AREA)
  • Adhesive Tapes (AREA)

Abstract

L'invention concerne un procédé de traitement par plasma indirect d'une couche anti-adhérente, comprenant les étapes consistant à : introduire un gaz plasmagène dans une chambre de décharge ; exciter le gaz plasmagène à un état de plasma par décharge ; évacuer le gaz plasmagène à un état de plasma de la chambre de décharge ; et exposer la couche anti-adhérente au gaz plasmagène à un état de plasma après évacuation du gaz plasmagène de la chambre de décharge. L'invention concerne également des couches anti-adhérentes, qui peuvent être obtenues selon ledit procédé ; des films protecteurs comprenant un support et une telle couche anti-adhérente ; ainsi que des rubans adhésifs comprenant le film protecteur selon l'invention et au moins une masse adhésive.
PCT/EP2015/075282 2014-11-06 2015-10-30 Procédé de traitement par plasma indirect de couches anti-adhérentes WO2016071232A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15797025.2A EP3215581A1 (fr) 2014-11-06 2015-10-30 Procédé de traitement par plasma indirect de couches anti-adhérentes

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014222723.2 2014-11-06
DE102014222723.2A DE102014222723A1 (de) 2014-11-06 2014-11-06 Verfahren zur indirekten Plasmabehandlung von Release-Schichten

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DE102016220691A1 (de) * 2016-10-21 2018-04-26 Tesa Se Mehrlagenverklebung
DE102018116748A1 (de) * 2018-07-11 2020-01-16 Infiana Germany Gmbh & Co. Kg Lokal deaktivierte Releasebeschichtung

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WO2004067663A1 (fr) * 2003-01-29 2004-08-12 Tesa Ag Bande adhesive et son utilisation pour coller des blanchets

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EP3415580A1 (fr) * 2017-06-14 2018-12-19 tesa SE Procédé d'encapsulation par plasma de bord simultanée d'au moins deux faces de bande adhésive

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