WO2016071256A1 - Traitement de couches anti-adhérentes par plasma - Google Patents

Traitement de couches anti-adhérentes par plasma Download PDF

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Publication number
WO2016071256A1
WO2016071256A1 PCT/EP2015/075400 EP2015075400W WO2016071256A1 WO 2016071256 A1 WO2016071256 A1 WO 2016071256A1 EP 2015075400 W EP2015075400 W EP 2015075400W WO 2016071256 A1 WO2016071256 A1 WO 2016071256A1
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WO
WIPO (PCT)
Prior art keywords
release
release layer
plasma
adhesive
silicone
Prior art date
Application number
PCT/EP2015/075400
Other languages
German (de)
English (en)
Inventor
Nikolay BELOV
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 EP15797026.0A priority Critical patent/EP3215582A1/fr
Publication of WO2016071256A1 publication Critical patent/WO2016071256A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/40—Adhesives in the form of films or foils characterised by release liners
    • 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
    • H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
    • H05H1/4645—Radiofrequency discharges
    • H05H1/466—Radiofrequency discharges using capacitive coupling means, e.g. electrodes
    • 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
    • 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
    • H05H2242/00—Auxiliary systems
    • H05H2242/20—Power circuits
    • H05H2242/22—DC, AC or pulsed generators

Definitions

  • the present invention relates to a process for the 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; and (iii) exposing the release layer to the plasma gas in a plasma state, wherein the plasma gas is excited into a plasma state via a high voltage electrical power having a frequency of 2000 to 100,000 Hz and the high voltage is pulsed at a switching frequency of 30 to 5000 Hz.
  • 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 therefore to address the disadvantages of the prior art and to provide an improved process with which the release values of release liners can be adjusted in a targeted manner, even for strongly tacky products, in a simple manner. without there being any significant change in the course of the release force profile compared to an 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 process for the plasma treatment of a release layer, comprising the steps of: introducing a plasma gas into a discharge space;
  • 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.
  • the release layer is exposed to a high voltage electrical discharge.
  • 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 between the lying at a high electrical potential electrode system and a counter electrode to ground potential.
  • the counterelectrode at ground potential is preferably a roller having a metal body which is grounded. If the electrodes are not coated with a high voltage resistant insulator, the backing roll must be coated with a high voltage resistant layer, such as a layer of silicone rubber, ceramic or glass. Alternatively, bare metal rolls or rolls with conductive coatings may be used when the electrodes are coated with a high voltage resistant insulator. Furthermore, both the electrodes and the counter-roller can be coated with a high-voltage resistant insulator.
  • the distance between the electrode system, which is preferably configured in the form of electrodes arranged parallel to the roller, and the track surface is typically between approximately 1 and 2 mm.
  • segment electrodes with fold-back individual segments which typically have a width of 5 to 20 mm.
  • the treatment width can be adjusted by folding back the segments in the side areas as needed.
  • the release layer applied to a support can be guided over a grounded treatment roller, so that the side of the release layer facing the electrode is treated.
  • Air between the treatment roller and the carrier may also cause a treatment effect on the back of the carrier.
  • Air between the treatment roller and the carrier may also cause a treatment effect on the back of the carrier.
  • the air before the treatment gap i. before the gap between the electrodes and the release layer to be treated, by means of a pressure roller, an air nozzle, by electrostatic application, e.g. be extruded by means of a charging electrode R130 Fa. Eltex, or another measure.
  • the carrier is thus guided over a treatment roller and pressed before the treatment gap on the treatment roller.
  • ambient air can be passed through the electrode housing or even through the electrodes themselves during discharge in air for cooling and to remove the ozone created.
  • the 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 from 0.9 to 1 .2 times the ambient pressure.
  • the present invention also speaks of "atmospheric pressure plasma treatment", which is also referred to herein as "corona treatment”.
  • 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 by discharging, is therefore also referred to as a barrier discharge
  • uniform treatment effects are sought over the entire electrode width of the corona or plasma system .
  • P m For a uniform discharge over the width of the electrodes is a relatively high minimum electrical power P m in needed. This means that a certain minimum treatment effect at a certain speed under normal conditions not substeps n
  • 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 is so pronounced that even with the smallest possible treatment strength separating forces against strongly pressure-sensitive adhesives, for example strong sticky acrylate adhesives are achieved, which no longer allow use of the treated surface as a release layer for such an adhesive.
  • a conventional, ie unpulsed, plasma treatment is not suitable for producing release layers with low release values in a range from 2 to 100 cN / cm in contrast to strongly pressure-sensitive adhesives.
  • the invention is based on the finding that the limit for the minimum treatment effect can be broken by pulsing (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 (see FIG. 1), so that a homogeneous discharge, preferably a homogeneous corona discharge, across the width of the electrodes is ensured during this time.
  • 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.
  • 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 electrical power Pet Stammiv a pulsed discharge results from the ratio of the on time ti to repetition time T and from the power P during the on-time.
  • P Pmin during the on-time an effective power of:
  • 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 machine speed so that the resulting dose D corresponds to the target dose Dsoii.
  • the pulsing of the high-frequency discharge is carried out according to the invention with a switching frequency of 30 to 5000 Hz. This ensures that the release layer can be exposed to a dose of 0.01 -6 W * min / m 2 .
  • 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 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.
  • Excitation of the plasma gas into a plasma state by discharge creates an atmosphere (also referred to herein generally as the "plasma atmosphere” and in the case of the corona).
  • the method according to the invention enables a gentle treatment of the release layer, which is suitable for the plasma 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 low release 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 area, i. 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 said 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”).
  • base polymers are silicone-based polymers.
  • Polysiloxanes preferably functionalized and unfunctionalized polydimethylsiloxanes used.
  • 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 release layer underlying composition 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. These include mixtures of crosslinking catalysts, so-called thermally curable condensation or addition-crosslinking polysiloxanes and crosslinking component. For condensation-crosslinking silicone systems, tin compounds such as dibutyltin diacetate are frequently included in the composition as crosslinking catalysts.
  • the 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: ⁇ an alkenylated polydiorganosiloxane (especially linear and branched polymers having 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 pulsed plasma treatment 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 siliconised glassine release paper G-Liner 1 12660 from Mondi Rheinlich GmbH with a width of 300 mm was used on a corona system with different thicknesses Web speeds of 10 m / min to 50 m / min treated.
  • the very low required generator power of the corona system, type Corona Plus of the company Vetaphone was with the built-in pulse width modulation function to 10 watts and over the web speeds of 10-50 m / min to corresponding doses of 0.4-2 W min / m2 set.
  • the gap between the electrodes and the release layer to be treated was set to 2 mm.
  • the electrode width was 500 mm.
  • the treatment of the release paper has been carried out in a nitrogen atmosphere with a residual oxygen content of less than 50 ppm.
  • the same release paper was treated on the same equipment with the pulse width modulation function switched off at the manufacturer's determined and specified minimum corona power without pulses of 500 W for a homogeneous treatment effect across the web width without pulse width modulation.
  • the calculation of the treatment dose is carried out according to the formula (1).
  • (1) D P / (v * b)
  • 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 three measurements of the force required for the separation of the bond corresponds to the separation 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 pulsed corona treated release paper is in Table 1. shown.
  • Table 1 Release force of untreated and treated Glassine release paper against acrylic adhesive tape tesa 7475 and natural rubber tape tesa 7476 with an electrode width of 500 mm.
  • the minimum increase in release force with a classic corona treatment to 151 cN / cm against tesa 7475 is too strong even at web speeds of 50 m / min in corona treatment to be suitable for release application be.
  • the increase of the separation force can be adjusted from small increases. In the example, at a web speed of 50 m / min (0.4 W min / m 2 at 10 W), an increase from 6 to 10 cN / cm was achieved against tesa 7475. With a possible reduction in power to about 1 W even smaller increases in the separation forces are possible. Examples 7-12
  • a double-sided siliconised PE-Coated release paper Poly Slik 603/80 gloss / gloss sf from Loparex BV with a width of 300 mm was treated on a corona machine with web speeds of 10 m / min to 50 m / min.
  • the performance of the Corona system has been reduced to 10 watts and corresponding doses of 0.4-2 Wmin / m2 compared to classical corona treatment by a generator with built-in pulse width modulation function.
  • the gap between the electrodes and the surface to be treated was set to 2 mm.
  • the electrode width was 500 mm.
  • the treatment of the release paper has been carried out in a nitrogen atmosphere, with a residual oxygen content of less than 50 ppm.
  • the same release paper was treated on the same equipment with pulse width modulation function switched off at the minimum corona power of 500 W for a homogeneous treatment effect across the web width without pulse width modulation.
  • the calculation of the treatment dose is carried out according to the formula (1).
  • the measurement of the separation forces was carried out as described for Examples 1-6. The measured separation forces are listed in Table 2.
  • the minimum increase in release force with a classic corona treatment to 124 cN / cm vs tesa 7475 is too strong even at web speeds of 50 m / min in the corona treatment to be suitable for release application.
  • the increase of the separation force can be adjusted from small increases. In the example, at a web speed of 50 m / min (0.4 W min / m 2 at 10 W), an increase from 3 to 6 cN / cm was achieved with respect to tesa 7475. With a possible reduction in power to about 1 W even smaller increases in the separation forces can be achieved.

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

Abstract

L'invention concerne un procédé de traitement d'une couche anti-adhérente par plasma, comprenant les étapes consistant à (i) introduire un gaz plasmagène dans une chambre de décharge ; (ii) exciter le gaz plasmagène à un état de plasma par décharge ; et (iii) exposer la couche anti-adhérente au gaz plasmagène à un état de plasma, l'excitation du gaz plasmagène à un état de plasma étant produite au moyen d'une haute tension électrique ayant une fréquence comprise entre 2 000 et 100 000 Hz et la haute tension étant pulsée avec une fréquence de commutation de 30 à 5 000 Hz. L'invention concerne également des couches anti-adhérentes, qui peuvent être obtenues selon le procédé décrit, ainsi que des films protecteurs comprenant un support et la couche anti-adhérente. L'invention porte en outre sur des rubans adhésifs comprenant le film protecteur décrit et une masse adhésive.
PCT/EP2015/075400 2014-11-06 2015-11-02 Traitement de couches anti-adhérentes par plasma WO2016071256A1 (fr)

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DE102014222724.0 2014-11-06
DE102014222724.0A DE102014222724A1 (de) 2014-11-06 2014-11-06 Plasmabehandlung von Release-Schichten

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019154976A1 (fr) 2018-02-09 2019-08-15 Coating Plasma Innovation Film de protection a base de silicium pour adhesif, son procede de fabrication et ses utilisations

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016220687A1 (de) * 2016-10-21 2018-04-26 Tesa Se Plasmabehandlung einer Mehrlagenverklebung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3632386A (en) * 1968-10-31 1972-01-04 Arbco Inc Treated silicone surface
DE3316166A1 (de) 1982-05-06 1983-11-10 General Electric Co., Schenectady, N.Y. Organopolysiloxane, verfahren zu ihrer herstellung und die verwendung dieser verbindungen
US4725630A (en) 1987-06-01 1988-02-16 Wacker Silicones Corporation α, β-unsaturated carbonyl-functional silicone compositions
US5106383A (en) * 1989-07-28 1992-04-21 Minnesota Mining And Manufacturing Company Closure systems for diapers and method of preparation
WO2004067663A1 (fr) * 2003-01-29 2004-08-12 Tesa Ag Bande adhesive et son utilisation pour coller des blanchets

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10011274A1 (de) * 2000-03-08 2001-09-13 Wolff Walsrode Ag Plasmabehandelte bahnförmige Werkstoffe
KR100672857B1 (ko) * 2005-06-13 2007-01-22 도레이새한 주식회사 실리콘 이형조성물 및 이를 이용한 실리콘 이형 플라스틱필름
DK1978067T3 (da) * 2007-04-02 2010-04-26 Nitto Europe Nv Slipforing

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3632386A (en) * 1968-10-31 1972-01-04 Arbco Inc Treated silicone surface
DE3316166A1 (de) 1982-05-06 1983-11-10 General Electric Co., Schenectady, N.Y. Organopolysiloxane, verfahren zu ihrer herstellung und die verwendung dieser verbindungen
US4725630A (en) 1987-06-01 1988-02-16 Wacker Silicones Corporation α, β-unsaturated carbonyl-functional silicone compositions
US5106383A (en) * 1989-07-28 1992-04-21 Minnesota Mining And Manufacturing Company Closure systems for diapers and method of preparation
WO2004067663A1 (fr) * 2003-01-29 2004-08-12 Tesa Ag Bande adhesive et son utilisation pour coller des blanchets

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
D. SATAS: "Handbook of Pressure Sensitive Adhesive Technology, 3rd ed.", pages: 664

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019154976A1 (fr) 2018-02-09 2019-08-15 Coating Plasma Innovation Film de protection a base de silicium pour adhesif, son procede de fabrication et ses utilisations

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