DE102013204835A1 - Multi-layer laminate - Google Patents

Abstract

The invention relates to a multilayer laminate (10) comprising a layer material (1) and at least two pressure-sensitive adhesive layers (12, 14), the pressure-sensitive adhesive layers (12, 14) each comprising a pressure-sensitive adhesive composition, an intermediate layer (12, 14) between the pressure-sensitive adhesive layers (12, 14). 16), the intermediate layer (16) comprising an interposer composition comprising one or more binders, and the interlayer having a glass transition temperature greater than 0 ° C.

Description

The invention relates to a multilayer laminate of a viewing material and at least two pressure-sensitive adhesive layers. The pressure-sensitive adhesive layers each comprise a pressure-sensitive adhesive composition.

Pressure-sensitive adhesives are used for the production of self-adhesive articles, such as labels, adhesive tapes or self-adhesive films. As a rule, the self-adhesive articles consist of several layers, in particular a viewing material, a pressure-sensitive adhesive layer and a detachable non-stick layer which protects the layer of pressure-sensitive adhesive until it is used.

In addition, it is also known to provide multilayer adhesive structures. For example, describes the EP 0 781 198 B1 a multilayer adhesive construction comprising a viewing material, a barrier layer on the viewing material and an adhesive layer on the barrier layer, said adhesive layer comprising a polymer composition containing at least one migrating organic substance, and the barrier layer comprises a pressure sensitive adhesive and adapted to prevent migration of the migrating organic material Minimized compound from the adhesive layer to the viewing material.

Furthermore, also describes the EP 0 793 542 B1 a removable pressure-sensitive adhesive construction with a back and two pressure-sensitive adhesive layers, namely a layer with a permanent pressure-sensitive adhesive and a layer with a removable pressure-sensitive adhesive, which are applied directly from a double nozzle, wherein the application is carried out on a release liner and then this substructure consisting of release surface and the two pressure-sensitive adhesive layers is laminated on a back. Alternatively, an application of the adhesive layers on the back can be done and a later lamination of the release liner.

The application of two pressure-sensitive adhesive layers in one process step, as described in the two cited references, also results from the DE 19 28 031 as well as the US 3,508,947.

Basically, it is known in the prior art, aufzubeschichten in such a high-speed coating devices corresponding pressure sensitive adhesives on a release or visual position, this low-cost systems are often used. From an ecological point of view and also for safety aspects, aqueous systems, eg. As acrylate, preferably used. Here, in the production of pressure-sensitive adhesive labels, various methods are used, such as pressure chamber doctor blade or curtain coater. Usually only one layer of a pressure-sensitive adhesive composition is coated on it. The disadvantage here, however, in the use of the abovementioned acrylate dispersions, that due to their structure, only a limited mechanical, thermal and chemical resistance results.

Finally, out of the EP 2 018 411 B1 the production of a double-sided adhesive tape is known in which a multilayer laminate consisting of two pressure-sensitive adhesive layers and a lying between the pressure-sensitive adhesive layers carrier layer is prepared in a coating process, wherein the glass transition temperature Tg of the carrier polymers of the composition of the carrier layer is greater than 0 ° C. On both pressure-sensitive adhesive layers is then applied on the side that does not interact with the carrier layer, then a release or release liner.

In general, pressure-sensitive adhesives often contain small molecules capable of migrating, that is to say molecules with a size of <1000 daltons, which can migrate from a pressure-sensitive adhesive layer into the visible material and lead there to undesired effects. For example, this may be the reduction of the thermal sensitivity of thermal papers, the reduction of the opacity of papers, but the viewing material may also become stained or yellow due to a changed refractive index over the viewing material or the vision material may partially swell.

Thermodynamic effects may be considered as a driving force, e.g. the diffusion due to thermal influences. Furthermore, the migration of the molecules can be caused by an existing concentration gradient, different solubility parameters or osmotic effects. Furthermore, components which adversely affect the pressure-sensitive adhesive layer or adversely affect the substrate to be adhered can be migrated from the viewing material or printed and / or coated viewing materials through the viewing material. Especially when pasting food or pharmaceutical products is a migration of any migratory shares on or in the adherend to be regarded as negative.

The barrier layers known in the prior art, which are applied in the direction of the pressure-sensitive adhesive layer on the viewing material, can not adequately remedy the problem, since the visible material manufacturer is often insufficiently familiar with the migratable parts of both the visible material layer and the adhesive layer and thus the barrier layer is not sufficiently matched to the migratory particles and the most impenetrable barrier layer, the adhesion and anchoring of the pressure sensitive adhesive on the barrier layer is usually worse than on the uncoated viewing material.

Starting from the known prior art, it is now an object of the invention to provide a multilayer laminate, wherein the laminate is to be used in particular for a pressure-sensitive adhesive label, in which the migration of migratory components between the visual material and pressure-sensitive adhesive layer prevents and at the same time the adhesion to the visual material is not impaired.

The object is achieved by a multilayer laminate having the features of claim 1 and a method having the features of claim 21 and a use having the features of claim 22.

It is provided that the multilayer laminate consists of two pressure-sensitive adhesive layers and an intermediate layer arranged between the pressure-sensitive adhesive layers, wherein the intermediate layer comprises an interlayer composition with one or more binders and the pressure-sensitive adhesive layers each comprise a pressure-sensitive adhesive composition. The pressure-sensitive adhesive composition of the first pressure-sensitive adhesive layer disposed adjacent to the face sheet is a permanent pressure-sensitive adhesive composition, and in the second pressure-sensitive adhesive layer disposed adjacent to the liner and having a free side, the pressure-sensitive adhesive composition is permanent or peelable.

The individual layers preferably have the same extent in the surface direction and cover each other over the entire surface.

A pressure-sensitive adhesive is a permanently adhesive at room temperature (21 ° C, 50% relative humidity).

The provision of two adhesive layers separated by the intermediate layer makes it possible to optimize the anchoring to the layer of visible material, while at the same time making sure that the composition is as low in migraine as possible, and at the same time also the functional pressure-sensitive adhesive layer which comes into contact with a substrate to be bonded with respect to the adhesive properties can be adjusted to the best possible substrate. The intermediate layer assumes the function of the barrier layer. This can in particular be easily exchanged and optimized with regard to migrants existing in the second pressure-sensitive adhesive layer.

Permanent pressure-sensitive adhesives usually have an adhesion which, at the use temperature (usually 21 ° C. and 50% relative humidity on the substrate to be bonded according to instructions, results in the pressure-sensitive laminate thus finished no longer having a short contact time (less than one hour) This may be due to cracking or splitting of the layer of visible material, partial or total failure of the adhesion between the layer of visible material and the adhesive layer associated therewith, because the adhesion to the substrate to be adhered is greater than the adhesion to the visible layer, or failure of the inner layer Strength of the pressure-sensitive adhesive (cohesive failure).

Detachable pressure-sensitive adhesives have a lower adhesion, which even after prolonged contact time, d. H. greater than one hour (t> 1 h), a residue-free detachment allows. For this purpose, adhesion-reducing additives, such as plasticizers or wax, are often used.

In general, pressure-sensitive adhesives are considered peelable if their adhesion at a coating weight of 18 g / m ² on a PET (30 μm thick) viewing material when adhered to steel or glass according to Finat Test Method No. 1 (FTM 1) at 23 ° C and 50% relative humidity does not exceed a liability of 7.5 N / 25 mm.

In this case, the multilayer laminate according to the invention contains at least two pressure-sensitive adhesive layers, wherein each of the pressure-sensitive adhesive layers has a pressure-sensitive adhesive composition which contains at least one pressure-sensitive adhesive polymer. The terms pressure sensitive adhesives and pressure sensitive adhesive compositions have been used synonymously. A pressure sensitive adhesive is a permanently tacky adhesive at room temperature (21 ° C). Each of the pressure-sensitive adhesive layers but also the intermediate layer can itself have several layers.

The following explanations apply to the pressure-sensitive adhesive compositions of both layers, unless specific reference is made to one of the layers.

As a basis for the pressure-sensitive adhesive composition, free-radically polymerized polymers, polyesters or polyadducts come into consideration, particularly preferably polymers obtainable by emulsion polymerization.

Typical polymer compositions for acrylate dispersions are known, for example, from US Pat DE 2 459 160 , of the EP 0 625 557 B1 as well as the EP 0 952 199 the content of which is the subject of the present disclosure.

Furthermore, synthetic and natural rubber systems can also be used. Further, pressure-sensitive adhesive compositions whose Properties by photochemical crosslinking, eg. B. by irradiation with electron radiation or UV light, can be adjusted, for. B. acResin ^® BASF, Ludwigshafen, Germany company.

Other possible polymers are in the prior art z. In Benedek, Feldstein: Technology of Pressure Sensitive Adhesives and Products, 1-1ff, Tailor and Francis Group 2009, and Satas (Et), Handbook of Pressure Sensitive Adhesive Technology, Chapters 10-16, van Nostrand, 1982 , known.

The essential properties of a pressure-sensitive adhesive or a pressure-sensitive adhesive composition are the tackiness, ie the adhesion, and the internal strength, namely the cohesion of the same.

The pressure-sensitive adhesive composition may consist solely of the one or more pressure-sensitive adhesive polymer (s) or further additives. These are usually used to set the desired processing and / or application properties. For this purpose u. a. Substances used to increase the adhesion, so-called tackifiers, or regulate, for. As plasticizer. Preferred tackifiers are natural or chemically modified rosin resins. Rosin resins consist predominantly of abietic acid or abietic acid derivatives. These can in their salt form, with z. B. mono- or polyvalent counterions (cations), or preferably in their esterified form, are present. Alcohols that can be used for esterification may be monovalent or polyvalent. Examples are methanol, ethanol, diethylene glycol, triethylene glycol, 1,2,3-propane triol, pentaerythritol. Other tackifiers can also be synthetic systems.

Other additives which may be added to the pressure-sensitive adhesive composition are e.g. As antioxidants, fillers, dyes, thickeners and leveling agents.

The pressure-sensitive adhesive composition of the first pressure-sensitive adhesive layer, which is in contact with the visual material, is, apart from water or other solvents, in particular more than 70 wt .-%, more preferably more than 80 wt .-% and more preferably more than 90% by weight of the pressure-sensitive adhesive polymer, which also includes mixtures of different pressure-sensitive adhesive polymers. The further, in particular the second pressure-sensitive adhesive layer consists, apart from water or other solvents, in particular more than 40 wt .-%, particularly preferably more than 60 wt .-% and more preferably more than 80 wt .-% of the Pressure-sensitive adhesive polymer, which also mixtures of different pressure-sensitive adhesive polymers are to be understood.

It is known to the person skilled in the art how the respectively desired pressure-sensitive adhesive properties can be adjusted. The use of crosslinked pressure-sensitive adhesive polymers increases the internal strength of the pressure-sensitive adhesive or adhesive composition, generally to the detriment of tackiness. Self-adhesive articles, which are coated with such pressure-sensitive adhesive compositions, are usually removable again without residue. Other pressure-sensitive adhesive compositions have a very high tack by the concomitant use of very polar monomers and optionally larger amounts of tackifier. Such finished articles can hardly be peeled off again without being damaged so that they can be termed permanent pressure-sensitive adhesive compositions. In addition, the use of crosslinked systems also changes the mechanical, thermal and chemical resistance of the pressure-sensitive adhesive composition.

The first layer of pressure-sensitive adhesive facing the layer of visible material is formulated in such a way that it has a very good anchoring to the visible material and, at the same time, contains only a minimal or preferably no proportion of substances which are considered capable of migration, ie molecules with a size of <1000 Dalton.

The second functional pressure sensitive adhesive layer, which interacts with a later adherend substrate, can be selected from the full range of available pressure sensitive adhesive systems.

If more than one intermediate layer or intermediate layer is provided, one or more further pressure-sensitive adhesive layers or pressure-sensitive adhesive layer layers may be provided between the intermediate layers or intermediate layer layers. These can serve the liability mediation or the compatibility improvement.

The glass transition temperature of pressure-sensitive adhesive polymers which are part of the pressure-sensitive adhesive composition, preferably less than or equal to + 21 °, more preferably less than or equal to 0 ° C and particularly preferably less than or equal to -10 ° C and particularly preferably less than or equal to -20 ° C or especially preferably less than or equal to -30 ° C. The lower limit is -70 ° C for the glass transition temperature.

In this case, the glass transition temperature of the polymers, both the pressure-sensitive adhesive layers and the intermediate layer, with the usual methods such as differential thermal analysis or Differentialscanningkalometrie, z. B. after ASTM 3418/82 , so-called "midpoint temperature".

According to the invention, any pressure-sensitive adhesives can be combined with one another. That is, all pressure-sensitive adhesive layers may be releasable or permanent pressure-sensitive adhesive compositions. However, it is also possible to combine permanent pressure-sensitive adhesive layers with detachable ones.

In general, pressure-sensitive adhesives are considered peelable if their adhesion at a coat weight of 18 g / m2 on a PET (30 μm) gauge when bonded with steel or glass in accordance with FINAT Test Method No. 1 (FTM 1) at 23 ° C and 50 ° % RH does not exceed a liability of 7.5 N / 25mm. Permanent pressure-sensitive adhesives are thus those which have an adhesion greater than 7.5 N / 25 mm under these conditions. This definition is also used in the present invention.

The layer thickness of the pressure-sensitive adhesive layers may be 1 to 100 .mu.m, preferably at least 3 .mu.m and more preferably at least 5 .mu.m, wherein the maximum layer thickness is preferably less than 60 .mu.m and more preferably less than 50 .mu.m and more preferably less than 40 microns.

The intermediate layer or barrier layer according to the invention consists essentially of one or more binders.

The binders are selected to effectively minimize or prevent the migration of migrants occurring or occurring in the particular case.

The one or more layers of the intermediate layer may be pressure-sensitive or preferably not pressure-sensitive.

Therefore, particularly preferred are binders whose glass transition temperature is preferably above the application temperature of the later product. In this case, the mobility of the molecules and thus the permeability of the intermediate layer is significantly reduced. The glass transition temperature Tg is preferably greater than 0 ° C., more preferably greater than 20 ° C., and particularly preferably greater than 35 ° C.

Furthermore, it is preferred that the interlayer binders, which consist of polymers, are crosslinked, so that they are preferably elastomeric binders. This also reduces the permeability to migratory substances.

Also, an increased crystalline content of the intersheet polymers is beneficial to increase the barrier effect.

Depending on the expected migrating substances, it may be provided to increase the polarity of the intermediate layer, e.g. impede nonpolar migrants in the movement. Or the intermediate layer can be designed so that the at least one migrant has a low solubility product in the intermediate layer. Also, the liner can be designed so that there is little interaction between migrant and liner.

The binders of the intermediate layer are in the reacted state, i. in the finished product preferably barely, in particular non-adhesive and therefore it is preferably not a pressure-sensitive adhesive.

Particularly advantageous is the design according to the invention with intermediate layer, since the intermediate layer is without influence on the anchoring to the viewing material out. In addition, the intermediate layer can be selected and designed based on the specific choice of the two pressure-sensitive adhesive layers, so that the influence on the second, functional pressure-sensitive adhesive layer can also be minimized. In particular, the pressure-sensitive adhesive layers can be selected, due to their desired properties and the intermediate layer can be customized. The second functional pressure-sensitive adhesive layer is independent of the first pressure-sensitive adhesive layer, so that both layers can be selected or adjusted separately based on the desired properties.

A preferred intermediate layer e.g. for mineral oils is, for example, Epotal A 816 BASF SE, BASF AG, Ludwigshafen, Germany.

The thickness of the intermediate layer can be 1 to 100 microns and depends inter alia on the type and amount of existing migrants, in particular, it is at least 2 microns and more preferably at least 4 microns and in general, the thickness is not greater than 80 microns, more preferably not larger than 40 μm, and more preferably not larger than 20 μm.

The pressure-sensitive adhesive composition and interposer composition are preferably liquid at room temperature. It can be 100% systems, a solution in water or organic solvent, a dispersion or a plastisol. 100% systems are compositions which are liquid in the processing state and which react with one another without release of a component of the composition with an increase in viscosity and / or the elastic fraction.

In this case, one of the pressure-sensitive adhesive layers is in particular permanent, d. H. insoluble, anchored on a viewing material. The viewing material consists in particular of paper or foil and preferably has a thickness of less than 200 microns.

The multilayer laminate preferably contains further layers. In particular, the pressure-sensitive adhesive layers can be covered with an antiadhesive layer or else a release layer in which a non-adhesive, ie detachable, side faces the pressure-sensitive adhesive layer. The non-stick or release liner is in particular a siliconized paper or a siliconized film. The non-stick or release liner is designed to protect the pressure-sensitive adhesive layer until it is used. Immediately before use, the non-stick or release liner is removed.

In addition, it can be provided that the second, free adhesive layer, which faces away from the viewing material is not covered, so that can be dispensed with a non-stick layer, since the free adhesive layer occurs during rolling in contact with the viewing material and this then protects both pressure-sensitive adhesive layers ,

The multilayer laminate has a thickness of 30 .mu.m-2 mm, preferably 50 .mu.m-500 .mu.m and more preferably of 60 .mu.m-250 .mu.m, but this includes all layers without release layers, if provided.

It should also be noted that in the case of an elastomeric intermediate layer and with knowledge of its flow properties, an increase in the load capacity (mechanical, thermal, chemical) depends strongly on the elastic component (storage modulus G '). Usually, an increase of the elastic portion leads to the improvement of said load capacities.

As a feature of the effectiveness of the invention, the proportion of the storage modulus G 'in the overall system is accordingly crucial. Frequently in rheological experiments the loss factor tanδ is used for the assessment. This represents a ratio between the viscous portion (loss modulus G ") and the elastic portion (storage modulus G '). Defined as tanδ = G" / G'. That is, the smaller the tanδ, the higher the elastic fraction.

The measurement of the tanδ is carried out as follows: introduction of a dry sample of the interposition composition into an 8 mm diameter plate / plate geometry (rheometer with suitable measurement accuracy, Anton Paar, MCR 301), layer thickness 50 to 500 μm. Temper the test setup and sample to 20 ° C ± 0.1 ° C, relative humidity 50% ± 5%. Measurement with an angular frequency ω = 100 to 1 rad / sec.

The person skilled in the art is aware that the measurement is permissible only with a suitable small amplitude or in the linear-viscoelastic range. This must be determined beforehand via an amplitude sweep. A suitable method is z. B. in the DIN 51810 described. According to the invention, the interlayer composition has in the state of use after the above measurement setup or measurement sequence at 20 ° C. in the frequency range ω = 100 to 1 rad / sec. a loss factor of tanδ of preferably less than 0.8, more preferably less than 0.4, and most preferably less than 0.3.

The multi-layer adhesive composite is obtainable by a coating process in which pressure-sensitive adhesives and interlayer composition are present and coated as an aqueous dispersion, solution or 100% liquid system. Preferably, the coating is applied to a non-stick layer, z. As a siliconized paper or film and then drying the coating. The coating of the pressure-sensitive adhesive layers and the intermediate layer is preferably carried out in one operation. Subsequently, the lamination with the viewing material then takes place.

For this purpose, a multiple cascade nozzle can be used.

A suitable coating method is for example from the US 3,508,947 previously known.

The multilayer laminate is preferably produced by a process in which the at least three flowable compositions (two pressure-sensitive adhesive compositions and one interposition composition) are continuously coated onto a web-shaped substrate, preferably a non-stick or release liner. The coating is carried out using a multiple cascade. The coating speed is preferably 30 to 1500 m / min, particularly preferably 150 to 1200 and very particularly preferably 300 to 1200 m / min.

The pressure-sensitive adhesive composition and the interlayer composition are in different containers and are fed from these as a liquid film.

An essential feature of the multi-cascade nozzle is that a total film is formed from the individual films to be coated. In this overall film, the individual films are in the spatial arrangement desired later in the multilayer laminate. The total film is fed from the multiple cascade nozzle onto the moving web-shaped carrier.

Preferably, the process is a slide coating process. In slidecoating, the overall film slides over a surface, e.g. B. metal surface (sliding) and is then deposited on the substrate.

In contrast, in a slot coating process, the entire film is fed directly from a slit or nozzle onto the substrate, ie without sliding.

It is furthermore preferably a curtain coating process. The curtain coating process deposits a free-falling film curtain on the substrate. In order for the film curtain to fall freely, the distance between the nozzle or other outlet opening and the moving substrate must be greater than the layer thickness to be coated.

Particularly preferred is a slide coating process in combination with a curtain coating process.

Alternatively, however, the coating of pressure-sensitive adhesive layers and interlayer layer can also be applied in several operations, e.g. be applied one after the other. However, the application in one operation is preferred.

The multilayer laminate is suitable as a self-adhesive article, in particular as a label or adhesive tape.

The invention allows the production of self-adhesive articles, in particular labels, but also adhesive tapes, and adhesive films, which have very good and constant adhesive properties. The multi-ply leads to an increase in the final adhesion for permanent pressure-sensitive adhesives and, in the case of removable pressure-sensitive adhesives, to an improvement and to long-term constant low adhesion values and thus permanent and residue-free removability.

In the drawing, an inventive structure is shown.

Showing:

1 a construction according to the prior art,

2 a construction according to the invention comprising a multilayer laminate with two pressure-sensitive adhesive layers, which are separated by an intermediate layer,

3 a sketch of the operation of a multilayer laminate according to the invention,

4 a possible application of a corresponding label and

5 in various representations possible constructions of the various pressure-sensitive adhesive layers and liners.

1 shows a three-layer structure of a conventional label with a viewing material 1 , a pressure-sensitive adhesive layer 2 and a cover material 3 with separation layer 4 ,

2 now show a structure in which a multilayer laminate 10 and a cover material 3 with separation layer 4 are provided. The multilayer laminate 10 includes a Sichtmateriallage 1 and instead of the pressure-sensitive adhesive layer 2 is a construction consisting of two pressure-sensitive adhesive layers 12 . 14 and an interposed intermediate layer 16 intended.

3 shows a multi-layer laminate according to the invention with a view material layer 1 and first adhesive layer 12 , a second layer of pressure-sensitive adhesive 14 , which is connected as a functional pressure-sensitive adhesive layer with a later substrate and an intermediate layer arranged therebetween 16 , where in 3 the second pressure-sensitive adhesive layer 14 on a substrate to be bonded 20 is applied.

In addition, on the viewing material 1 a print 22 with a migratory substance 24 arranged, with the migratory substance 24 partly within the visual material 1 as well as within the first pressure-sensitive adhesive layer 12 is shown. Due to the intermediate layer formed as a barrier layer, the migratable substance passes 24 not in the second pressure-sensitive adhesive layer 14 and therefore not in the substrate to be bonded 20 ,

4 shows a further application, in which case the multilayer laminate with the reference numeral 10 is provided and from a Sichtmateriallage 1 , a first layer of pressure-sensitive adhesive 12 , a liner 16 and a second pressure-sensitive adhesive layer 14 is formed, with a corresponding separation layer 3 already removed. The multilayer laminate 10 is here about the opening 32 an example aluminum container 30 glued, thus preventing the escape of volatile or migratory substances and at the same time contamination from the outside. D. h., Volatile substances within the container, although, for example, in the pressure-sensitive adhesive layer 14 penetrate, but do not get into the liner 16 and, in the same way, external substances may optionally be incorporated in the visual material 1 and in the first pressure-sensitive adhesive layer 12 penetrate, but also do not happen the liner 16 ,

5 now shows in various representations possible embodiments of the various layers. Thus, illustration a) shows a pressure-sensitive adhesive layer 12 consisting of two pressure-sensitive adhesive layers 12a and 12b and Representation b) an intermediate layer 16 consisting of two layers of intermediate layers 16a and 16b ,

Presentation c) shows an intermediate layer 16 consisting of a first layer of interlayer 16a and a second liner layer 16b and a pressure-sensitive adhesive layer disposed therebetween 16c whereas representation d) is also an intermediate layer 16 shows with a first liner layer 16a a pressure-sensitive adhesive layer 16c as well as two further layers of interlayer 16b and 16d ,

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 0781198 B1 [0003]
• EP 0793542 B1 [0004]
• DE1928031 [0005]
• US 3508947 [0005, 0061]
• EP 2018411 B1 [0007]
• DE 2459160 [0023]
• EP 0625557 B1 [0023]
• EP 0952199 [0023]

Cited non-patent literature

• Benedek, Feldstein: Technology of Pressure Sensitive Adhesives and Products, 1-1ff, Tailor and Francis Group 2009, and Satas (Et), Handbook of Pressure Sensitive Adhesive Technology, Chapters 10-16, van Nostrand, 1982 [0025 ]
• ASTM 3418/82 [0035]
• DIN 51810 [0058]

Claims (20)

Multilayer laminate ( 10 ) from a visual material ( 1 ) and at least two pressure-sensitive adhesive layers ( 12 . 14 ), the pressure-sensitive adhesive layers ( 12 . 14 ) each comprise a pressure-sensitive adhesive composition, characterized in that between the pressure-sensitive adhesive layers ( 12 . 14 ) an intermediate layer ( 16 ), the intermediate layer ( 16 ) comprises an interposer composition with one or more binders, and in that the interlayer has a glass transition temperature Tg greater than 0 ° C. Multilayer laminate according to claim 1, characterized in that the glass transition temperature Tg of the intermediate layer ( 16 ) is greater than or equal to 20 ° C, and in particular greater than or equal to 35 ° C. Multilayer laminate according to one of the preceding claims, characterized in that the glass transition temperature of at least one of the pressure-sensitive adhesive layers ( 12 . 14 ) is less than or equal to + 10 ° C, and in particular less than or equal to 0 ° C and in particular less than or equal to -20 ° C, in particular less than or equal to -30 ° C. Multilayer laminate according to one of the preceding claims, characterized in that the glass transition temperature of at least one of the pressure-sensitive adhesive layers ( 12 . 14 ) is greater than or equal to -70 ° C Multilayer laminate according to claim 1, characterized in that the glass transition temperature of the intermediate layer ( 16 ) above the application temperature of the multilayer laminate ( 10 ). Multilayer laminate according to one of the preceding claims, characterized in that the pressure-sensitive adhesive layers ( 12 . 14 ) and / or the intermediate layer ( 16 ) each consist of several pressure-sensitive adhesive layers and / or intermediate layer layers. Multilayer laminate according to one of the preceding claims, characterized in that the at least one binder of the intermediate layer ( 16 ) are not sticky at room temperature. Multilayer laminate according to one of the preceding claims, characterized in that as a binder of the intermediate layer ( 16 ) (Poly) acrylates, (poly) urethanes, isocyanates, epoxies, amines, (poly) esters, (poly) alcohols, (poly) carboxylic acids or mixtures thereof are provided. Multilayer laminate according to claim 8, characterized in that the binder polymers are crosslinked. Multilayer laminate according to one of the preceding claims, characterized in that the interlayer composition has a tan δ <0.8, in particular tan δ <0.4 and particularly preferably tan δ <0.3 at ω = 0-100-1 rad / s. Multilayer laminate according to one of the preceding claims, characterized in that the layer thickness of each of the pressure-sensitive adhesive layers ( 12 . 14 ) Is 1-50 μm, preferably at least 2 μm and more preferably at least 4 μm, and the maximum layer thickness is preferably less than 30 μm and more preferably less than 20 μm and particularly preferably less than 10 μm. Multilayer laminate according to one of the preceding claims, characterized in that the layer thickness of the intermediate layer ( 16 ) Is 1-100 μm, preferably at least 2 μm and more preferably at least 4 μm, and the maximum layer thickness is preferably less than 50 μm and more preferably less than 30 μm. Multilayer laminate according to one of the preceding claims, characterized in that the laminate ( 10 ) consisting of visual material and the pressure-sensitive adhesive layers and the intermediate layer ( 16 ) together have a thickness of 25 microns to 2 mm, preferably from 30 microns to 500 microns and more preferably from 40 microns to 200 microns. Multilayer laminate according to one of the preceding claims, characterized in that the pressure-sensitive adhesive composition and / or both, preferably one or more synthetic and / or natural polymers as a pressure-sensitive adhesive polymer, and in particular tackifiers, antioxidants, fillers, dyes, thickeners and / or flow control agents includes. Multilayer laminate according to one of the preceding claims, characterized in that the pressure-sensitive adhesive composition consists of at least 40%, preferably at least 70% and more preferably at least 80% and more preferably at least 90% of one or more pressure-sensitive adhesive polymers. Multilayer laminate according to one of the preceding claims, characterized in that the laminate ( 10 ) further layers, in particular a removable release layer ( 3 ) on the one free side of the second pressure-sensitive adhesive layer ( 14 ) owns. Multilayer laminate according to one of the preceding claims, characterized in that the visual material ( 1 ) insoluble with the first pressure-sensitive adhesive layer ( 12 ) connected is. Multilayer laminate according to one of the preceding claims, characterized in that the visual material ( 1 ) from a foil or a Paper consists and in particular has a maximum thickness of 200 microns. Multilayer laminate according to one of the preceding claims, characterized in that the laminate ( 10 ) can be prepared by coating the pressure-sensitive adhesive compositions and the interposition composition with a multi-cascade nozzle in one process step. Multilayer laminate according to one of the preceding claims, characterized in that the pressure-sensitive adhesive composition and the interlayer composition are in the form of an aqueous dispersion, solution or 100% liquid system. Process for producing a multilayer laminate according to one of the preceding claims from at least one viewing material ( 10 ) and two pressure-sensitive adhesive layers ( 12 . 14 ), the pressure-sensitive adhesive layers ( 12 . 14 ) each comprise a pressure-sensitive adhesive composition, characterized in that between the pressure-sensitive adhesive layers ( 12 . 14 ) comprises an interlayer composition comprising one or more binders, and the intermediate layer ( 16 ) has a glass transition temperature Tg less than 0 ° C. Use of a multilayer laminate according to one of the preceding claims as a label or as an adhesive tape or as an adhesive film.

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