EP3830208A1 - Klebeband zur verklebung von niederenergetischen oberflächen - Google Patents
Klebeband zur verklebung von niederenergetischen oberflächenInfo
- Publication number
- EP3830208A1 EP3830208A1 EP19749341.4A EP19749341A EP3830208A1 EP 3830208 A1 EP3830208 A1 EP 3830208A1 EP 19749341 A EP19749341 A EP 19749341A EP 3830208 A1 EP3830208 A1 EP 3830208A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- adhesive
- adhesive tape
- psa
- light
- block copolymer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
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- 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
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/385—Acrylic polymers
-
- 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
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
-
- 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
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
-
- 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
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/08—Homopolymers or copolymers of acrylic acid esters
-
- 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
- C09J153/00—Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
- C09J153/02—Vinyl aromatic monomers and conjugated dienes
-
- 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
- C09J7/10—Adhesives in the form of films or foils without carriers
-
- 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
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/387—Block-copolymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/416—Additional features of adhesives in the form of films or foils characterized by the presence of essential components use of irradiation
-
- 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
- C09J2423/00—Presence of polyolefin
-
- 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
- C09J2433/00—Presence of (meth)acrylic polymer
-
- 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
- C09J2453/00—Presence of block copolymer
-
- 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
- C09J2493/00—Presence of natural resin
Definitions
- the present invention relates to an adhesive tape for bonding low-energy
- PSAs are known which are based on solvent-free acrylate adhesives.
- the acrylic adhesives are applied to a carrier by a hot melt process via a nozzle and then crosslinked with UV-C light. This allows a layer of a
- PSA or a backing coated with a PSA can be obtained, which can function as adhesive tapes.
- building blocks containing photoactive side chains are polymerized into acrylic copolymers.
- Crosslinking of the acrylate copolymers can be brought about under irradiation with UV light.
- the crosslinking ensures the cohesion of the adhesive, which is sufficient for the respective application.
- cohesion refers to the forces that hold the adhesive together, while adhesion is understood to mean the adhesion of adhesive layers to the surfaces of the parts to be joined.
- the coordinated ratio of cohesive and adhesive forces determines the strength of the respective bond against mechanical stress.
- the process of UV crosslinking can also be referred to as curing.
- the semi-finished product Before being cross-linked, the semi-finished product is in the form of a low-viscosity film. After crosslinking, the semi-finished product forms an adhesive tape.
- UV-C light it is common to use UV-C light to crosslink acrylic glass adhesives. This has a wavelength in the range of 200-280 nm, in which the absorption maximum of the acrylate adhesives lies.
- Relatively complex UV lamps are used to provide UV-C light needed in the form of discharge lamps.
- discharge lamps has the disadvantage that a comparatively high radiant heat arises, which must be dissipated in order not to damage the material to be crosslinked.
- Another disadvantage is the limited penetration depth of UV-C radiation, which limits the possible layer thickness of the semi-finished products to be irradiated. So the networking process comes through one-sided
- rosin ester resins (Foral 85 E, Foral 105 E) are mainly used to modify the acrylate adhesives.
- adhesive tape means any form of flat adhesive systems, not just adhesive tapes in the narrower sense, but also adhesive films, adhesive strips, adhesive plates or adhesive die-cut parts.
- Adhesive is the term used for adhesive bonds in which the two joining partners are connected to one another by an adhesive layer in between and under pressure. The connection is reversible in such a way that it can be released again without damaging the two joining partners, because the adhesive seam is the weakest point in the joining connection.
- UV crosslinking describes a process in which materials are converted from a low-molecular to a high-molecular state with the help of high-energy radiation.
- UV (ultraviolet) radiation is understood to mean “UVA” or “UVC” light.
- UV-A radiation is in the wave range of approx. 315 to 400 nanometers (nm)
- UV-C radiation is in the wave range of approx. 200 to 280 nm. In general, both are
- UVA light the energy input is approx. 3.26 to 3.95 electron volts (eV), with UVC light approx. 4.43 to 12.40 eV.
- an adhesive tape for bonding low-energy surfaces which comprises a UV-crosslinked PSA comprising polyacrylate, a linear or branched vinylaromatic block copolymer, and at least one adhesive resin.
- the UV crosslinking of the PSA is based on irradiation with light comprising UV-A.
- nn * transitions are understood to mean electronic excitations from non-binding orbitals (n orbitals) to antibonding orbitals (n * orbitals), whereby these suggestions are actually spin-prohibited, but made possible by a sufficiently high spin-orbit coupling become.
- n-n * transitions generally require less energy for excitation than the permitted TT-TT * transitions, which are responsible for the absorption maximum. According to statistical thermodynamics, n-n * transitions are very unlikely. Irradiation of the acrylic adhesive with UV-A light has several advantages.
- UV-A light irradiation With UV-A light irradiation, higher penetration depths can be achieved, since UV-A light is less susceptible to absorption than UV-C light when it passes through the acrylate adhesive. This is due, among other things, to the fact that most resins are slightly yellowish to yellow and thus absorb light in the UV range. The shorter the wavelength of UV light, the stronger the absorption. Because of this, the selection of the sufficiently transparent resins in the UV-A range much larger than in the UV-C range. There are also light and colorless resins that are more transparent in the UV-A range, but may already appear to be less transparent in the UV-C range and may therefore allow for a lower penetration depth. Yellow resins (containing double bonds and aromatics and fused aromatics) often become colorless resins by partial and full hydrogenation. In contrast to UV-C light, the high wavelengths of UV-A light in the range of 320-400 nm thus enable the use of a broad spectrum of adhesive resins.
- the irradiation of the acrylate adhesive with UV-A light enables an increased addition of adhesive resins.
- This enables the provision of adhesive tapes, which enable adhesion on difficult substrates, low-energy substrates, and / or low-surface energy (LSE) surfaces (ie, difficult-to-bond, low-energy surfaces such as PTFE, PP or PE) that can be bonded with pure Acrylic adhesives or with
- LSE low-surface energy
- Acrylic adhesives that have fewer adhesive resins cannot be achieved.
- Such surfaces are, for example, car paints or polyethylene surfaces.
- Low-energy surfaces have a critical interfacial energy in the range of 15 to 45 mN / m.
- the interfacial energy can take place according to the measurement methods according to DIN 53 364 or ASTM 2578-84.
- UV-A light is more suitable for penetrating modified acrylic adhesive compositions which have been modified, for example, by adding adhesive resins.
- adhesive resins it was only possible to modify the acrylate adhesives by means of adhesive resins if the adhesive resins are compatible with the acrylate adhesive, that is to say they can be dissolved therein.
- the adhesive resins were only able to act as tackifiers with a homogeneous adhesive.
- acrylate adhesives have mainly been used with rosins (rosin esters, hydrogenated, disproportionated). These resins are relatively polar and are therefore well compatible with the polar acrylic adhesive.
- acrylic adhesive is not very wide.
- Acrylic PSAs or other types of hot melt acrylates (without UV crosslinking).
- Acrylic rubber blends have particularly good adhesive properties on low-energy surfaces.
- Known and suitable rubbers are, for example, styrene block copolymers (SBCs).
- SBCs styrene block copolymers
- the acrylate phase and the SBC phase are separate.
- adhesive resins polar, but also non-polar resins are used. These blends are used today, for example, on adhesive tapes for bonding to car paint.
- modified acrylate adhesives in the form of acrylate-rubber blends. This allows the advantages of acrylic hotmelt adhesives (simple coating, as solvent-free, small system, fast UV crosslinking) to be combined with the modification options of blends, for example for the bonding of difficult substrates.
- non-polar adhesive resins such as Polyterpene resins in all variations or fully synthetic C5 and C9 resins in all
- Blends are not homogeneous, but consist of two phases: acrylate + adhesive resins and rubber + adhesive resins.
- the adhesive resins are distributed according to their compatibility, the polymers (acrylate, rubber) do not mix.
- the PSA of the adhesive tape can be completely crosslinked by UV-A light at a Gardner color number of 1 to 2 to a depth of 150 pm. Accordingly, adhesive tapes with a thickness of up to 150 pm can be completely crosslinked. In this way, compared to adhesive tapes based on UV-B curing, higher layer thicknesses can be completely cross-linked by one-sided radiation. By means of irradiation on both sides, comparatively thicker adhesive tapes can be completely cross-linked.
- the PSA has an application weight in the range from 20 g / m 2 to 150 g / m 2 , preferably 70 g / m 2 and a Gardner color number of 1 to 2.
- Such a PSA can be completely crosslinked by irradiation with light comprising UV-A.
- higher layer thicknesses can thus be completely cross-linked by one-sided irradiation.
- the adhesive tape comprises 30-75% by weight of the UV-crosslinked PSA, 2-40% by weight of the linear or branched vinylaromatic block copolymer, and 4-40% by weight of the at least one adhesive resin.
- the UV-crosslinked PSA comprises one in the
- Polyacrylate chain polymerized UV initiator In the case of the raw material of UV crosslinking Adhesive can be, for example, a hot melt acrylate. Due to the polymerized UV initiator, the PSA can be cured in a few seconds by irradiation with UV light.
- the acResin product range from BASF is an example of UV-crosslinkable PSAs with polymerized UV initiators.
- the vinylaromatic block copolymer comprises soft blocks, the homo- and copolymers of butadiene, isoprene, ethylbutadiene and partially or fully hydrogenated variants thereof, and hard blocks comprising homo- and copolymers of styrene, alpha-methylstyrene and their derivatives.
- the hard block preferably comprises polystyrene and the soft block polyisoprene or polybutadiene.
- the at least one adhesive resin from the group of non, partially, selectively or completely hydrogenated hydrocarbon resins based on C5, C5 / C9 or C9 monomers, and / or from the group of polyterpene resins based on alpha- Pinene and / or beta-pinene and / or delta-limonene, where the resins can also be derivatized with phenol. Mixtures of the above resins are also possible. Partially hydrogenated or fully hydrogenated resins have a comparatively lower Gardner color number, which leads to less absorption during UV crosslinking.
- the adhesive tape comprises antioxidants, fillers, dyes, rheological additives and / or UV protection agents.
- the PSA is foamed.
- a foamed adhesive has a greater thickness than a comparable unfoamed adhesive with the same weight.
- hollow glass spheres can be mixed into a starting adhesive.
- expanding microballoons can be mixed into the starting adhesive.
- the foaming of the adhesive then takes place with an increased temperature treatment.
- a method for producing an adhesive tape for bonding low-energy surfaces comprises the following steps: a) melting a vinylaromatic block copolymer and an adhesive resin; b) stirring the Vinyl aromatic block copolymer and the adhesive resin; c) Add a UV cross-linkable
- Vinyl aromatic block copolymer, adhesive resin and pressure sensitive adhesive on a sheet material e) irradiating the blend in particular with UV-A light to provide a UV-crosslinked adhesive tape.
- the blend is completely crosslinked with a Gardner color number from 1 to 2 to a depth of 150 pm by means of light comprising UV-A. This allows you to compare to
- Adhesive tapes which are based on curing by UV-B, higher layer thicknesses are completely cross-linked by one-sided radiation. By means of irradiation on both sides, comparatively thicker adhesive tapes can be completely cross-linked.
- the UV-crosslinkable PSA has an application weight in the range from 20 g / m 2 to 150 g / m 2 , preferably 70 g / m 2 , and the blend is a Gardner for the complete cross-linking of the blend by means of light comprising UV-A - Color number from 1 to 2.
- higher layer thicknesses can thus be completely cross-linked by one-sided irradiation.
- the radiation has a photon energy of 3.26 to 3.94 eV.
- the vinylaromatic block copolymer and the adhesive resin are melted at a temperature between 70-170 ° C., preferably 80-160 ° C. for the application according to step a).
- the above temperature range enables the blend to melt and at the same time prevents the components from gelling.
- LEDs are used to irradiate the blend with UV-A light. In comparison to discharge lamps, which are used for the irradiation with UV-C light, LEDs have a significantly higher efficiency.
- LED UV systems have a high radiation intensity combined with low heat radiation.
- the method is solvent-free.
- the method can be designed to be comparatively environmentally friendly and inexpensive. Detailed description of preferred embodiments
- SAFT Shear strength test
- Peel strength on steel and polyethylene is measured in accordance with DIN ISO 1939 in a standard climate (23 ° C, 50% relative humidity).
- a substrate is wiped off with a cloth soaked in gasoline. If the gasoline has evaporated, it is a sample strip (adhesive layer, which was laminated onto an etched PET film, thickness 50 mm) was applied to the substrate with a width of 25 mm and then rolled twice over the sample strip (5 m / min) using a roller (weight 5 kg)
- the test specimen thus produced is conditioned for 24 hours in a standard climate (23 ° C, 50% humidity) and then the force is measured which has to be applied at a pull-off angle of 180 ° at a speed of 300 mm / min in order to remove the test strip from The value given corresponds to the average of three measurements.
- stainless steel accordinging to Afera standard 4001 or polyethylene (test plates from Rocholl) can be used as the substrate.
- the fracture pattern is assessed. AF stands for adhesion breakage to the substrate, CF for cohesion breakage and AFCa for adhesion breakage for the etched PET film. If the fracture pattern is CF, i.e. if the layer of adhesive splits into itself, this indicates that the adhesive is not sufficiently cross-linked. 90 ° peel strength on lacquered sheet:
- the measurement of the 90 ° peel strength on painted sheet is based on DIN ISO 1939 in a standard climate (23 ° C, 50% relative humidity).
- the lacquered sheet consists of a steel sheet with a three-layer paint structure: filler, basecoat and as clearcoat: 2K clearcoat Supermar from Axalta, drying conditions: 20 min at 140 ° C.
- the test strip is a PE foam adhesive tape, consisting of a polyethylene foam as carrier (Alveolit TMA SRZ 801 from Sekusui Alveo), which is pretreated on both sides with corona radiation, and on both sides of the adhesive film (application weight 70 g / m 2 , is laminated on siliconized PET film).
- the paint plate is wiped with a cloth soaked in petrol. Once the petrol has evaporated, the test strip (width 25 mm) is glued on one side after removal of the siliconized PET film.
- the PET film on the back is replaced by an unsiliconized, etched PET film (thickness 50 pm).
- the composite is then rolled on with a roll (weight 5kg, 5 m / min).
- the test specimen is conditioned for 24 hours in a standard climate (23 ° C, 50% humidity) and then the force is measured, which is applied at a pull-off angle of 90 °
- Speed of 100 mm / min must be used in order to detach the sample strip or the adhesive tape from the substrate.
- the specified value corresponds to the average of three measurements.
- the Gardner color number provides a measure of the yellow color of a resin.
- a corresponding Gardner color scale ranges from 1 to 18 and is determined either by color comparison with cobalt chloride solutions of different concentrations or in accordance with DIN EN 4630 with spectroscopic methods at 380-720 nm. 1 means crystal clear, 3 is slightly yellowish, 5 is already clearly yellow to amber. Due to the spectral proximity, a strong yellowing in the visible range can also be used as a measure of the absorption of UV light in the UV-A range (320 to 400 nm).
- the Gardner color number of a solution of the resin in toluene (50%) is given by the adhesive resin manufacturers in the data sheet. A clear difference can be seen in particular between color numbers 4 and 5. While color number 4 still leads to yellowish-colored adhesives, resins with color number 5 already produce clearly dark-colored adhesives. materials
- styrene block copolymer and resin are melted at a temperature of 165 ° C. and stirred until a uniform, clear melt is formed. The mixture is then cooled to 150 ° C. and UV acrylate hotmelt is added until a quasi-homogeneous white mixture is formed.
- the mixture is coated in a hot melt coating device between two waves (temperature 145 ° C.) on siliconized polyester film.
- the gap setting between the two shafts is chosen so that the resulting application quantity is 70 g / m 2 .
- Coating is cooled.
- a cloudy transfer film is obtained which is used for the measurement.
- the cloudiness indicates that it is a blend adhesive.
- the transfer films are then irradiated under UV light. There are two types of radiation:
- UV-C Irradiation with a laboratory radiation device UV mini laboratory dryer BE 7/1 from Beltron. The full UV intensity is set, belt speed 6 m / min.
- UV-A Irradiation in a Hönle LEDcube100 irradiation chamber with Hönle LEDpowerdrive 40 control unit, wavelength 365 nm, duration 20 seconds.
- the radiation intensities in both devices are measured using the same UV measuring device, namely the Power Puck II from EIT Instrument Markets Group. In doing so separately measured the intensities at UVC, UVB and UVA.
- the different irradiations in the times listed lead to the following intensities:
- Examples B1 to B5 show the adhesive composition of the various test specimens:
- Examples B1 to B5 are compared to comparative examples VB1 to VB3.
- Test specimens of comparative examples VB1 to VB3 have the following recipe:
- test specimens transfer films
- test specimens PE foam adhesive tape
- Comparative example VB1 which has a pure acrylate hotmelt adhesive, is also crosslinked under UV-A light (high SAFT value), but the peel strengths on low-energy substrates such as polyethylene or lacquered sheet are very much lower than in examples B1 to B5 ,
- Comparative example VB3 has a strongly yellow resin with a Gardner color number of 5. No crosslinking takes place here even under UV-A conditions. This is because the UV light cannot penetrate deeper due to the strong color and therefore does not cause crosslinking.
- Example B1 is crosslinked very well under UV-A radiation and has a high peel strength on polyethylene and on coated sheet metal.
- formulations B1 to B5 can be adequately crosslinked by means of UV-A light irradiation and the adhesive tapes which can thus be produced have very good bond strengths on low-energy substrates.
- all individual features that are shown in the exemplary embodiments can be combined and / or exchanged with one another without leaving the scope of the invention.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Adhesive Tapes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102018118972.9A DE102018118972B4 (de) | 2018-08-03 | 2018-08-03 | Klebeband zur Verklebung von PTFE, PE, PP und Autolacken und Verfahren zur Herstellung |
PCT/EP2019/070909 WO2020025800A1 (de) | 2018-08-03 | 2019-08-02 | Klebeband zur verklebung von niederenergetischen oberflächen |
Publications (1)
Publication Number | Publication Date |
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EP3830208A1 true EP3830208A1 (de) | 2021-06-09 |
Family
ID=67539516
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP19749341.4A Withdrawn EP3830208A1 (de) | 2018-08-03 | 2019-08-02 | Klebeband zur verklebung von niederenergetischen oberflächen |
Country Status (4)
Country | Link |
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US (1) | US20210230456A1 (de) |
EP (1) | EP3830208A1 (de) |
DE (1) | DE102018118972B4 (de) |
WO (1) | WO2020025800A1 (de) |
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DE10149084A1 (de) * | 2001-10-05 | 2003-06-18 | Tesa Ag | UV-vernetzbare Acrylathaftschmelzhaftkleber mit enger Molekulargewichtsverteilung |
US7238732B2 (en) * | 2004-02-18 | 2007-07-03 | Eastman Chemical Company | Radiation-curable adhesive compositions |
US20070264487A1 (en) * | 2006-05-12 | 2007-11-15 | Dean Georgiades | Treated film strips |
DE102007063021A1 (de) * | 2007-12-21 | 2009-06-25 | Tesa Ag | Corona-behandelte Klebemassen |
DE102008028427A1 (de) * | 2008-05-23 | 2009-11-26 | Tesa Se | Klebeband mit textilem Träger für die Kabelbandagierung |
JP2010126697A (ja) * | 2008-11-28 | 2010-06-10 | Three M Innovative Properties Co | 粘着剤組成物および粘着テープ |
DE102009046625A1 (de) * | 2009-11-11 | 2011-05-12 | Tesa Se | Etikett mit Effektpigmenten |
EP2682444A1 (de) * | 2012-07-06 | 2014-01-08 | Bostik SA | Verwendung einer Haftzusammensetzung zur Bereitstellung einer Klebung in einer nassen Umgebung |
DE102013000995A1 (de) | 2012-08-16 | 2014-02-20 | Lohmann Gmbh & Co. Kg | Klebemittel mit Klebstoffblend aus Acrylat und Styrol-Block-Copolymer |
WO2015164856A2 (en) * | 2014-04-25 | 2015-10-29 | Firestone Building Products Co., LLC | Construction materials including a non-woven layer of pressure-sensitive adhesive |
TWI679259B (zh) * | 2014-08-11 | 2019-12-11 | 德商漢高智慧財產控股公司 | 光學透明的熱熔黏著劑及其用途 |
DE102016212483A1 (de) * | 2016-07-08 | 2018-01-11 | Tesa Se | Gewebeklebeband |
CN111448278B (zh) * | 2017-12-11 | 2022-01-25 | 3M创新有限公司 | 抗冲击拉伸-剥离粘合剂 |
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2018
- 2018-08-03 DE DE102018118972.9A patent/DE102018118972B4/de active Active
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2019
- 2019-08-02 EP EP19749341.4A patent/EP3830208A1/de not_active Withdrawn
- 2019-08-02 US US17/265,447 patent/US20210230456A1/en not_active Abandoned
- 2019-08-02 WO PCT/EP2019/070909 patent/WO2020025800A1/de unknown
Also Published As
Publication number | Publication date |
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DE102018118972B4 (de) | 2024-02-01 |
US20210230456A1 (en) | 2021-07-29 |
WO2020025800A1 (de) | 2020-02-06 |
DE102018118972A1 (de) | 2020-02-06 |
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