DE202010014075U1 - Technical adhesive tape for bonding foils or nonwovens in the construction sector - Google Patents

Abstract

Technical adhesive tape, in particular for bonding foils or nonwovens in the construction sector, with a tape-shaped carrier made of plastic and with a pressure-sensitive adhesive coating applied on at least one side and consisting of a pressure-sensitive adhesive and applied with a weight per unit area of at least 100 g / m2 , characterized in that the carrier comprises a cast polyolefin film and is so elastically and plastically stretchable that a difference value Δε between the percentage total elongation under load and the percentage permanent elongation after subsequent relief is in the range of 15 to 50 percent, with the measurement In accordance with DIN 53360 on 25 mm wide and at least 250 mm long sample strips taken along the direction of production of the film, the total elongation is determined under a static load of 1 kg applied for 30 minutes and the permanent elongation takes place 30 minutes after the sample has been relieved is determined.

Description

The present invention relates to a technical adhesive tape, in particular for bonding films or nonwovens in the construction sector, with a band-shaped carrier consisting of plastic and having a pressure-sensitive adhesive coating applied at least on one side and applied at a basis weight of at least 100 g / m ² .

In the construction sector, in the case of external insulation of structures, very permeable materials are generally preferred in order to rapidly allow any moisture that has penetrated to evaporate again. If such large-area, vapor-permeable roof underlays are glued only at the joints, a diffusion-inhibiting or diffusion-tight bonding does not have a negative effect due to the comparatively small surface area. The situation is different with the bonding of joints and connections in confined spaces and corners, such as in the area of window installations. Here, the proportion of bonded surfaces is often 50% or more and thus has a significant impact on the overall diffusion behavior of the roof seal. In such areas, therefore, vapor-permeable adhesive tapes are preferred.

An adhesive tape of the type mentioned is from the EP 1 548 080 B1 known. In order to give this adhesive tape a low adhesion on rough substrates, it is provided that the adhesive coating has an application weight of 120-250 g / m ² and is applied and crosslinked in such a way that the adhesive tape has a certain initial adhesion to steel as well has a certain bond strength and shear strength. As support materials of the known adhesive tape commercial papers, films or textiles are mentioned. Papers can preferably be provided with water repellency by means of a PE coating or a wax layer, while PE or PP films can preferably be reinforced with a scrim to improve the tensile strength. The adhesives used for the adhesive coating based on polyacrylates, a high aging and moisture stability can be ensured. The EP 1 548 080 B1 describes in particular the use of a UV-crosslinked acrylate adhesive for binders of the type mentioned above. Such an adhesive contains no emulsifiers and has a high water resistance. Such tapes are therefore basically suitable for moisture-stressed areas in terms of the adhesive used.

The CH 687 328 A5 describes an adhesive tape with a coated paper backing for bonding roofing membranes. A PE (polyethylene) coating "controls" the vapor diffusion capacity of the paper. However, since moisture-stable materials are needed for insulation outdoors, such tapes are generally not used outdoors.

Furthermore, also describes the CH 686 673 A5 an adhesive tape with a PE film carrier which should also be "vapor permeable". Adhesive tapes with such paper or foil coatings are also usually used only in the interior of the house for sealing vapor barrier films or vapor barriers. As they are often based on dispersion-based acrylate adhesives, their use according to the manufacturer is restricted to dry indoor areas.

In none of the three documents mentioned are measurement methods for determining the vapor permeability nor values of this size for the claimed binders.

For the description of the diffusivity of a material, however, for example, the water vapor diffusion current density V - in g / m ² · days - according to DIN EN ISO 7783-1 certainly. The weight loss of a filled with a saline solution and covered with the test specimen container is determined over time. A common indication is also that of the water vapor diffusion equivalent air layer thickness s _d - given in m -, which eats calculated from the water vapor diffusion current density. For this is the Standard DIN 52615 binding. In the art, materials with an s _d value ≤ 0.5 m are usually referred to as diffusion-open, those with an s _d value of 0.5 m-1500 m as diffusion-inhibiting and materials with an s _d value> 1500 m as diffusion-tight ,

The EP 1 847 577 A2 describes an adhesive tape with a film carrier made of EVA (ethyl vinyl acetate) and TPE-E (ether-ester block copolymer) for the vapor-permeable bonding of roofing membranes above the insulating layer. In addition to a low s _d value of ≤ 12 m, a special elongation behavior is emphasized. For this purpose, a difference value between the percentage total strain under load and the percentage permanent strain after stress (in the following: strain parameter) is introduced as a characteristic parameter. This parameter, for which, based on the Standard DIN 53360 a special method of detection is described, according to the EP 1 847 577 A2 between 6 and 80 percent.

To determine the elastic elongation properties, a determination based on the DIN standard DIN 53360 a change in length from a 25 mm wide sample strip under a static load of 1 kg for 30 minutes and a change in length after discharge of the sample strip are determined. From these two values, the difference between the total strain and the residual strain can be calculated as a parameter.

In detail, 3 specimens of 25 mm width and at least 250 mm length are taken in each case for carrying out the measurements from carrier material samples along the direction of production. On the specimens, a gauge length of 100 ± 0.5 mm is drawn with two thin markers. The marked marks must lie on the specimens at the same distance from the specimen ends. At the marks the course of the longitudinal axis is to draw.

The total strain of a specimen is the ratio of the total length change to the original gauge length of the specimen. The total length change is the difference between the measuring length at constant tensile stress after the stress duration and the original measuring length of the test specimen.

The permanent strain is the ratio of the permanent change in length to the original gauge length of the specimen. The permanent change in length after relief is the difference between the measuring length after the test specimen has been relieved, d. H. after removal of the tensile stress after the specified period of time and the original measuring length of the test specimen.

The tests are carried out at a condition of 23 ± 2 ° C and a relative humidity of 50%. The samples are to be acclimatised for 24 hours in the same climate before the measurements. The 25 mm wide test strips are clamped to an upper jaw, the lower end is loaded with a clamp and a weight of 1 kg. After 30 minutes, the distance between the measuring marks, under tension, is read. After discharge, d. H. Removing the 1 kg weight, the strain is measured again after another 30 minutes. From these values, the total strain and the permanent strain in percent can be calculated. Then the difference between the total strain (static strain) and the residual strain is determined.

Prior art PE and PS (polystyrene) film supports were prepared according to the EP 1 847 577 A2 Parameter values in the range of 0.13 to 5.13 percent determined. These carriers are considered unsuitable.

The document contains no quantitative information on the grammage of the adhesive coating. The required extensibility in combination with a low s _d value in this case also have tapes with perforated PE film as a carrier. The disadvantage here can be a possible adhesive breakdown through the perforation holes.

Permeable are also known from the trade tapes with paper or nonwoven backing (Tyvek ^®), but which have a very low extensibility in the rule.

In addition to the requirements for the diffusion properties and the extensibility of the adhesive tapes, manual tear properties are often preferred because of the desirability of being handled easily on construction sites. This is especially true for the processing in the roof area, where it is often not practical to handle with additional cutting tools.

Contrary to this requirement behaves that to the film carrier of said tapes and certain minimum requirements with respect to a z. B. after DIN ISO 7765-2 to be determined puncture resistance.

Finally, it should be noted that outside the glued tapes are at least temporarily exposed to direct sunlight. This is especially true when - as is often the case in the roof area - the roofing membranes are dyed black. For the interior designed foil tapes as used in the CH 686 673 A5 and their support as "typical PE films" in the comparative examples in the EP 1 847 577 A2 are described, it comes when heated in the bonded state due to the lack of flexibility above about 80 ° C to a drape. Although this goes back after cooling back, but it may remain residual openings, which later affect the tightness.

The present invention has for its object to develop a, especially in the outdoor use of buildings usable, adhesive tape of the type mentioned, which is both waterproof, as well as flexible to tear by hand but has a high puncture resistance and at high temperature loads in Bonded state elastic shrinkage and stretching processes can follow, without causing wrinkles. In a particular embodiment, this adhesive tape should also be open to diffusion.

This object is achieved on the one hand with an adhesive tape of the type mentioned, in which the carrier consists of a cast polyolefin film and is elastically and plastically extensible, that a difference Δε between the total percentage strain during loading and the percentage permanent elongation after subsequent relief in the field from 15 to 50 percent, with the measurement being based on DIN 53360 on 25 mm wide and at least 250 mm long test strips taken along the direction of manufacture of the film under a static load of 1 kg applied for 30 minutes, the total elongation is determined and the residual elongation is determined 30 minutes after the sample strip has been relieved.

In the case of a vapor-permeable adhesive tape, on the other hand, this object is achieved with an adhesive tape of the type mentioned above, in which the support is made of polyurethane film and is elastically and plastically extensible such that a difference Δε between the total percentage elongation under load and the percentage permanent elongation subsequent relief in the range of 100 to 500 percent is in the measurement based on DIN 53360 on 25 mm wide and at least 250 mm long test strips taken along the direction of manufacture of the film under a static load of 1 kg applied for 30 minutes, the total elongation is determined and the residual elongation is determined 30 minutes after the sample strip has been relieved.

A significant difference between adhesive tapes according to the invention and those known to be used consists, in particular in the material structure of the support according to the invention, of a cast polyolefin film or of a polyurethane film.

Polyolefin films, especially polyethylene films, are usually made by either blown extrusion or by casting. Both cast films and blown films can be produced as coextruded films with up to seven different layers.

In blown extrusion, the molten polymer mass exiting an extruder is formed into a tube by an annular die. This tube is stretched in length and width, so that the resulting film is stretched in the longitudinal and transverse directions. The tube is cooled by an inner and an outer air flow, laid flat and cut into two film webs.

In the casting or flat film method used according to the invention for the production of the polyolefinic adhesive tape carrier, the molten polymer composition is applied to a chill roll through a slot die. The roller speed is usually higher than the exit speed at the nozzle. As a result, the thickness of the resulting film is adjusted and the film itself oriented in the longitudinal direction. The chill roll may have an embossment, which then finds itself as a pattern in the film.

Cast films have a lower crystallinity than blown films due to their faster cooling and thus a higher smoothness. Surprisingly, it has been shown that for a polyolefin film produced in this way, in particular when it has a polyethylene content of at least 50%, multiply higher values of the difference Δε between the total percentage elongation under load and the percentage permanent elongation after subsequent relief can be achieved. In particular, values in the range from 15 percent to 50 percent, preferably from 20 percent to 30 percent, can be set for this parameter, which predestines the film for the adhesive tape backing of the invention.

The water vapor diffusion equivalent air layer thickness s _d can be in the range of 15 m after DIN 52615 lie, in particular in a range of 15 m to 20 m. The carrier is thus diffusion-inhibiting.

In order to achieve a good anchoring of polar adhesives (acrylates) on the initially non-polar film for a self-adhesive equipment of the carrier, the film can be exposed to one or both sides of an electrical discharge (corona) before coating with the adhesive with advantage.

With a carrier according to the invention consists of a - preferably produced as a blown film - PUR film, instead, a high water vapor permeability with a water vapor diffusion equivalent air layer thickness s _d of ≤ 0.5 m, in particular in the range of 0.2 m to 0.4 m, after DIN 52615 be set. The carrier is therefore open to diffusion.

PUR films are UV and weather resistant and are known to be used, for example, in sports and weatherproof clothing in the form of thin, breathable membranes. A use as a protective film in the automotive sector or for wind turbines is from the EP 1 004 608 B1 known. For medical purposes, self-adhesive polyurethane films are used, for example, for plasters and wound dressings. Another advantage is the well-known high elasticity of such dressings. The invention - as a tape backing for bonding films or nonwovens in the construction sector - a completely new field of application is thereby opened up these films.

For the difference value Δε between the percentage total elongation under load and the percentage permanent elongation after subsequent relief, values in the range from 130 percent to 250 percent, particularly preferably in the range from 150 percent to 210 percent, can preferably be set for the PUR adhesive tape backing according to the invention.

It has been found that when such a film is made from aromatic polyurethanes, yellowing can occur quite rapidly under UV radiation. By contrast, aliphatic PUR films are largely lightfast and are therefore preferred.

In addition, with advantage in that the polyurethane film preferably consists of a polyether polyurethane, the film can be provided with a higher hydrolysis resistance than a film of a polyester polyurethane.

As can be seen from the examples below, both bands according to the invention with PE cast film carrier as well as tapes with PUR film can be designed as a carrier without perforation hand-tearable, but at the same time have a high puncture resistance and shrinkage even at high temperature loads in the bonded state - And stretching processes can follow elastically, without causing wrinkles.

The tear strength can be easily tested on the one hand in the subjective test. However, a better comparability provides an examination EN 12025 with the so-called Elmendorf pendulum. Adhesive tapes have proved to be readily tearable in practice, the tear propagation force of which according to Elmendorf is not more than 15 N, preferably not more than 10 N.

As already mentioned, the puncture resistance of film webs after the DIN ISO 7765-2 certainly. Using electronics, a deformation occurring up to bursting - indicated in mm - and the work required for this - indicated in J - are measured. In the case of PUR adhesive tapes according to the invention, deformation values in the range from 10 mm to 28 mm, preferably from 15 mm to 25 mm, are adjustable, the values for the work required for puncturing preferably being in the range from 0.4 J to 1.8 J in the range of 0.7 J to 1.0 J, ie ≥ 0.6 J.

The thickness of the carrier can be in the range from 30 μm to 200 μm, preferably in the range from 50 μm to 80 μm, both for the polyolefinic cast film adhesive tape and for the polyurethane adhesive tape.

For adhesive tapes according to the invention for roofing, acrylate-based pressure-sensitive adhesives may preferably be used because of their good resistance to aging. As a rule, these acrylate adhesives can be applied either as a dispersion or as hotmelts to be crosslinked by means of UV radiation. In principle, the use of solvent acrylates or the use of acrylate monomer mixtures or acrylate prepolymers, which are polymerized after the coating either thermally or by means of UV radiation, is also possible. In addition, the use of other pressure-sensitive adhesive classes such. As adhesives based on synthetic rubber such as SIS (styrene-isoprene-styrene copolymer) or SBS (styrene-butadiene rubber) or adhesives on silicone or polyurethane-based possible.

As a cover for the adhesive tape according to the invention, for example, one or both sides of siliconized papers or films can be used, which may preferably be additionally filmed on one or both sides with PE. The films are usually made of PE, PP (polypropylene) or corresponding coextrudates. In general, the adhesive is coated on this cover, then dried, crosslinked or polymerized and only then brought in a lamination onto the substrate. It is also possible Silicone coating on the back of the carrier, so that the tape can be wrapped on itself without additional liner.

To limit the stretching can be incorporated between the adhesive and the carrier or within the adhesive layer a scrim. Its tensile strength should be below that of the actual carrier material. Such a construction initially allows a low-strain processing; but if the application requires an elongation, the scrim is severed with little effort without immediately entrain the carrier material. An effect on the temperature behavior of the tape was not found in the presence of such a gel. At the same time, such a scrim supports the rupture of the tape.

Further advantageous embodiments of the invention are contained in the subclaims and the following specific description. On the basis of several embodiments, the invention will be explained in more detail.

example 1

A double-sided siliconized glassine paper having a weight per unit area of 90 g / m ² was coated with a dispersion acrylate adhesive Acronal V210 from BASF and dried by means of warm air and / or IR radiation so that an application weight of 200 g / m ² remained after drying. The coated web was cooled and a cast PE film (thickness: 70 μm, grammage: 65 g / m ² ) was laminated as a carrier. Hereinafter, this adhesive tape or its carrier is marked with the letter D.

Example 2

A one-sided siliconized glassine paper having a weight per unit area of 90 g / m ² was provided with a coating of 200 g / m ^{2 of} Acylate AcResin 250 from BASF, which was crosslinked directly afterwards by means of UV radiation. The UV-C dose (measured with Power-Puck ^™ from EIT, Sterling, Virginia) was 70 mJ / cm ² . The coated web was cooled and in one operation a PET (polyethylene terephthalate) scrim (4 threads / cm in the machine direction, 2 threads / cm across the machine direction, thread size 78 dtex) and as a tape carrier a cast, micro-embossed LDPE Foil (thickness: 70 microns, grammage: 50-55 g / m ² ) laminated. Subsequently, this tape or his carrier is marked with the letter E.

Example 3

A double-sided siliconized glassine paper having a weight per unit area of 90 g / m ² was provided with a coating of 200 g / m ^{2 of} Acylate AcResin 250 from BASF, which was then crosslinked directly by means of UV radiation. The UV-C dose (measured with Power-Puck ^™ from EIT, Sterling, Virginia) is 70 mJ / cm ² . The coated web was cooled, and in one pass, a PET scrim (4 strands / cm in the machine direction, 2 strands / cm across, 90 dtex) and an aromatic polyether polyurethane film 50 microns thick and 50 grams in weight / m ² laminated. Hereinafter, this adhesive tape or its carrier is marked with the letter F.

Comparative Examples

A

– kunststoffbeschichteter Papierträger wie in der CH 687 328 A5 mit einem UV-Acrylatklebstoff (UV-A),

B

– LDPE-Folienträger (Blasfolie, Grammatur: 70 g/m²) wie in der CH 686 673 A5 , mit einem Fadengelege und einem UV-Acrylatklebstoff (UV-A),

C

– EVA/TPE-Folienträger (Grammatur: 70 g/m²) wie in der EP 1 847 577 A2 , mit einem Fadengelege und einem Dispersionsacrylatklebstoff (D-A),

G

– Träger aus perforierter PE-Folie (70 g/m²), mit einem Fadengelege und einem UV-Acrylatklebstoff (UV-A),

H

– PE-Vliesträger (Tyvek^®) (Grammatur: 60 g/m²) mit einem UV-Acrylatklebstoff (UV-A).

Adhesive tapes according to the prior art were used as comparative examples. These adhesive tapes or their carriers are designated as follows:

A

Plastic coated paper carrier as in CH 687 328 A5 with a UV acrylate adhesive (UV-A),

B

- LDPE film carrier (blown film, grammage: 70 g / m ² ) as in CH 686 673 A5 , with a scrim and a UV-acrylate adhesive (UV-A),

C

- EVA / TPE film carrier (grammage: 70 g / m ² ) as in EP 1 847 577 A2 , with a scrim and a dispersion acrylate adhesive (DA),

G

- carrier made of perforated PE film (70 g / m ² ), with a scrim and a UV-acrylate adhesive (UV-A),

H

- Non-woven polyethylene (Tyvek ^® ) (grammage: 60 g / m ² ) with a UV acrylic adhesive (UV-A).

To assess the hand tearability, the tear strength of Elmendorf was first determined on adhesive tapes of width 60 mm. The values shown in Table 1 were determined. Table 1: Tensile strength of various adhesive tapes according to Elmendorf duct tape Elmendorf force in N A 3-4 B 8-15 C 7-9 D 5-7 e 6-8 F 7-10

To assess the diffusion behavior, the s _d values shown below in Table 2 were then determined on adhesive tape samples having a sample area of 20 cm ² .

The flexibility of the carrier of the aforementioned adhesive tapes (without scrim and adhesive layer) was under the above conditions or as described in the EP 1 847 577 A2 determined from the difference in percent of total elongation at 30 minutes loading of a 25 mm wide strip with a mass of 1 kg and the percent residual elongation after release. This resulted in the values listed in Table 3. Table 2: Water vapor diffusibility of various adhesive tapes duct tape s _d value in m A 2-3 B 20-25 G 1-2 H 0.2-0.4 C 1-2 e 15-20 F 0.2-0.4 Table 3: Expansion behavior of various adhesive tape carriers duct tape Strain value Δε in% A 0-1 H 1-2 B 5-10 D 20-30 G 25-30 C 50-60 F 170-210

The data show that the tapes of the invention have a significantly higher flexibility than conventional LDPE blown films, as paper and PE nonwovens. The PUR film carrier according to the invention is even significantly more flexible than that in FIG EP 1 847 577 A2 claimed carrier material.

When bonding the adhesive tapes produced from the carrier materials listed in Table 3 to black roofing membranes, the advantages of high flexibility clearly showed on exposure to heat: while the strip with the conventional PE blown film exhibited a marked drapery, the bonds of tapes according to the invention made of film carriers remained higher Strain parameters unchanged.

The puncture resistance of various adhesive tapes was different from the DIN ISO 7765-2 with sample dimensions 60 mm x 60 mm. The results are shown in Table 4. Table 4: puncture resistance and deformability of various adhesive tapes duct tape Puncture deformation in mm Puncture work in J A 5-8 0.2-0.3 B 9-11 0.2-0.3 C 10-13 0.4-0.5 F 18-25 0.7-1.1

The data show that a band according to the invention having a PUR support has a significantly higher deformability and a higher puncture resistance, in spite of the good tear tearability in accordance with Table 1.

The following Table 5 shows the values of the example bands and those of two comparison bands corresponding to the bands of the CH 686 673 A5 and the EP 1 847 577 A2 Table 5: Technical data for various adhesive tapes A C D e F Carrier film material PE EVA / PE PE PE PURE Manufacturing blown cast cast blown Thickness [μm] 70 70 70 70 50 Adhesive material UV-A THERE THERE UV-A UV-A Grammage [g / m ² ] 200 230 200 200 200 scrim Yes Yes No Yes Yes s _d 20-25 1-2 15-20 15-20 0.2-0.4 Δε [%] 5-10 50-60 20-30 20-30 170-210 TV1 wrinkles - - - - TV2 wrinkles - - - - EK [N] 8-15 7-9 5-7 6-8 7-10 _WDS [J] 0.2-0.3 0.4-0.5 0.2-0.3 0.2-0.3 0.7-1.1 BK [N / cm] 20-25 20-25 10-15 20-25 35-45 RD [%] 350-400 550-600 250-300 250-300 500-550 KK [N / cm] 18-20 12-15 12-15 18-20 18-20

Δε

– der Dehnungsparameter,

TV1

– das Temperaturverhalten der verklebten Folie auf schwarzer Vliesunterspannbahn nach 10 min bei 85°C,

TV2

– das Temperaturverhalten der verklebten Folie auf schwarzer PUR-Dachbahn nach 10 min bei 85°C,

EK

– die Elmendorfkraft nach EN 12025 ,

W_DS

– die Durchstoßarbeit nach DIN ISO 7765-2 ,

BK

– die Bruchkraft nach DIN EN 14410 ,

RD

– die Reißdehnung nach DIN EN 14410 ,

KK

– die Klebkraft (auf Stahl) nach DIN EN 1939 .

In Table 5, mean:

Δε

- the expansion parameter,

TV1

The temperature behavior of the bonded film on a black fleece underlay after 10 minutes at 85 ° C.,

TV2

The temperature behavior of the bonded film on a black PUR roofing sheet after 10 minutes at 85 ° C.,

EK

- the Elmendorf force after EN 12025 .

W _DS

- the puncture work after DIN ISO 7765-2 .

BK

- the breaking force after DIN EN 14410 .

RD

- the elongation at break after DIN EN 14410 .

KK

- the bond strength (on steel) after DIN EN 1939 ,

"Fold" means for TV1 and TV2 that a strong wrinkle occurred, while "-" means that no wrinkles formed. Both the tapes according to the invention with PE cast film carrier and the belt with PUR film as carrier showed no wrinkling under temperature stress. All tapes were easy to tear by hand.

The invention is not limited to the described embodiments, but also includes all the same in the context of the invention embodiments. Thus, the skilled person can supplement the invention by additional advantageous measures, without departing from the scope of the invention. Such measures are, for example, the production of a double-sided adhesive tape or the use of a multi-layered carrier.

Furthermore, the invention is not limited to the feature combinations defined in claims 1 and 15, but may also be defined by any other combination of particular features of all the individual features disclosed overall. This means that each individual feature of the independent claims can be omitted or replaced by at least one feature disclosed elsewhere. In this respect, the claims are to be understood merely as a first formulation attempt for an invention.

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 1548080 B1 [0003, 0003]
• CH 687328 A5 [0004, 0046]
• CH 686673 A5 [0005, 0019, 0046, 0054]
• EP 1847577 A2 [0008, 0008, 0014, 0019, 0046, 0049, 0050, 0054]
• EP 1004608 B1 [0031]

Cited non-patent literature

• DIN EN ISO 7783-1 [0007]
• Standard DIN 52615 [0007]
• Standard DIN 53360 [0008]
• DIN standard DIN 53360 [0009]
• DIN ISO 7765-2 [0018]
• DIN 53360 [0021]
• DIN 53360 [0022]
• DIN 52615 [0028]
• DIN 52615 [0030]
• EN 12025 [0036]
• DIN ISO 7765-2 [0037]
• ISO 7765-2 [0052]
• EN 12025 [0055]
• DIN ISO 7765-2 [0055]
• DIN EN 14410 [0055]
• DIN EN 14410 [0055]
• DIN EN 1939 [0055]

Claims (14)

Technical adhesive tape, in particular for bonding films or nonwovens in the construction sector, with a band-shaped carrier made of plastic and with a pressure-sensitive adhesive coating composed of a pressure-sensitive adhesive applied at least on one side and applied at a weight per unit area of at least 100 g / m ² characterized in that the support comprises a cast polyolefin film and is elastically and plastically extensible such that a difference Δε between the total strain at load and the percent elongation after subsequent relief is in the range of 15 to 50 percent; Measurement in accordance with DIN 53360 on 25 mm wide and at least 250 mm long, taken along the direction of manufacture of the film sample strip under a applied for 30 minutes static load of 1 kg, the determination of the total elongation occurs and the permanent elongation 30 minutes after unloading g of the sample strip is determined. Adhesive tape according to claim 1, characterized in that the polyolefin film has a Polyethlyenanteil of at least 50%. Adhesive tape according to claim 1 or 2, characterized by a water vapor diffusion equivalent air layer thickness s _d of> 15 m according to DIN 52615. Adhesive tape according to the preamble of claim 1, characterized in that the carrier comprises a polyurethane film and is elastically and plastically extensible such that a difference Δε between the percentage total strain under load and the percentage permanent elongation after subsequent relief in the range of 100 to 500 percent with the measurement based on DIN 53360 on 25 mm wide and at least 250 mm long, taken along the direction of manufacture of the film sample strip under a static load of 1 kg applied for 30 minutes, the determination of the total elongation and the permanent elongation 30 minutes is determined after relieving the sample strip. Adhesive tape according to claim 4, characterized in that the carrier consists of an aliphatic polyurethane. Adhesive tape according to claim 4 or 5, characterized in that the carrier consists of a polyether polyurethane. Adhesive tape according to one of claims 4 to 6, characterized by a water vapor diffusion equivalent air layer thickness s _d of ≤ 0.5 m according to DIN 52615. Adhesive tape according to one of claims 4 to 7, characterized by a puncture work of ≥ 0.6 J according to DIN ISO 7765-2. Adhesive tape according to one of claims 1 to 8, characterized in that between the carrier and adhesive coating or within the adhesive coating a scrim is arranged. Adhesive tape according to one of Claims 1 to 9, characterized in that the adhesive coating consists of an acrylate adhesive, preferably of a UV-crosslinked or UV-polymerized acrylate adhesive. Adhesive tape according to one of claims 1 to 10, characterized in that the tape is rupturable by hand, wherein it has a tensile strength according to Elmendorf of ≤ 15 N, preferably ≤ 10 N. Adhesive tape according to one of Claims 1 to 11, characterized in that the thickness of the support is in the range from 30 μm to 200 μm, preferably in the range from 50 μm to 80 μm. Adhesive tape according to one of claims 1 to 12, characterized in that the carrier is coated on both sides with a pressure-sensitive adhesive. Adhesive tape according to one of Claims 1 to 13, characterized in that the carrier has a multilayer structure.