Sealing tape

Abstract

The invention relates to a foam sealing tape, for example for sealing between two construction parts, in particular between a frame component and the masonry associated with the frame component, wherein the sealing tape has opposite broad sides that can be associated with the construction parts and narrow sides extending perpendicularly to the broad sides and is permeable to water vapor diffusion from one of the narrow sides to the other narrow side and wherein furthermore the sealing tape has a barrier layer made of a material that is different from the foam sealing tape material and that extends at least partially across the cross-section of the water vapor diffusion path. The barrier layer is made at least partially of a material that reversibly changes the resistance of said material to water vapor diffusion with the humidity.

Description

[0001] The invention relates to a foam sealing tape, for example for sealing between two building parts, in particular between a frame component and the masonry associated therewith, wherein the sealing tape has opposite broad sides which can be associated with the building parts and narrow sides running transversely to these, wherein the sealing tape is further designed to be permeable to water vapor diffusion from one of the narrow sides to the other, forming a water vapor diffusion path, and wherein the sealing tape further has a barrier layer made of a material different from the foam sealing tape material, which barrier layer extends at least partially or completely over the cross section of the water vapor diffusion path.

[0002] Such sealing tapes are used in a variety of ways to seal building joints. The barrier layer is usually positioned on the inside of the room in the installed position of the sealing tape, so that the sealing tape is sealed according to the principle "tighter on the inside than on the outside" (referring to the water vapor diffusion resistance of the sealing tape). This creates a corresponding diffusion gradient due to the different water vapor diffusion resistances of the individual sealing tape areas, and the water vapor entering the sealing tape on the inside can be dissipated from the sealing tape to the outside. The barrier layer can be designed, for example, as a separate film or as a coating; reference is made, for example, to EP 1 811 111 A1, EP 2 309 090 A1, or DE 196 41 415 C2 or similar documents.

[0003] The sealing tape is designed to fulfil its intended function in a variety of indoor climates as well as in varying weather conditions outside the room, with regard to the removal of water vapor to the outside of the room. Furthermore, moisture should not accumulate in the sealing tape area, for example on the structural surfaces enclosing the sealing tape, but should be removed as water vapor via the sealing tape to the outside of the room. This is intended to prevent, for example, condensation from forming on the structural surfaces enclosing the sealing tape, which could lead to structural damage in the long term. Conventional sealing tapes, however, only partially meet these requirements. If, for example, the barrier layer has a comparatively low water vapor permeability, only a very small amount of air humidity inside the room can be removed as water vapor via the sealing tape.On the other hand, if the barrier layer has a comparatively high water vapor permeability, there is a risk of condensation forming in the area of the sealing tape, particularly at very cold outside temperatures, and thus of damage to the masonry, frame component or the sealing tape.

[0004] DE 200 09 674 U1 describes a multi-layer sealing tape with several interconnected layers of foam, each with a different density, with an airtight barrier layer provided between two layers.

[0005] The invention is based on the object of providing a foam sealing tape which at least largely prevents moisture accumulation in the area of the sealing tape even at low outside temperatures, but has sufficient water vapor permeability.

[0006] This object is achieved by a sealing tape according to claim 1 and a wall structure according to claim 12.

[0007] According to the invention, the barrier layer consists at least partially of a material whose water vapor diffusion resistance (WDP) reversibly changes with the air humidity (the barrier layer thus increases the WDP resistance compared to the foam material, but is still permeable to water vapor diffusion), with the further features of claim 1. This allows water vapor to pass through the barrier layer and the sealing tape in a controlled manner depending on the air humidity. If, for example, the air humidity inside the room is relatively high, the water vapor diffusion resistance of the barrier layer can change, for example, decrease, so that moisture inside the room can more easily diffuse outward through the barrier layer and excessive room humidity can be avoided.If the air humidity inside the room - and therefore also at the barrier layer - is relatively low, the water vapor diffusion resistance (s D value) of the barrier layer increases, for example, and less water vapor passes through the barrier layer from the inside of the room. Any moisture present in the sealing tape area, for example on the component surfaces bordering the sealing tape on its broad sides, can then be reliably dissipated via the sealing tape, since additional exposure of the sealing tape to water vapor from the inside of the room is limited by the increase in the water vapor diffusion resistance of the barrier layer. The moisture that may accumulate on the building components can be due to condensation, for example, but also to water absorbed in the masonry, for example in building components made of porous material such as porous stone, aerated concrete or the like.These changes in air humidity, which require a change in the setting of the s D value of the barrier layer, can occur depending on the time of day (change from day to night) or depending on the weather or season, so that over a certain period of time, removal of the moisture present in the sealing tape area can be ensured by the barrier layer according to the invention.

[0008] In the context of the invention, the "wide side" is generally the sealing tape side that is designed or intended to engage the components forming the joint. The wide side is generally (but not necessarily) wider than the adjacent "narrow side." This can apply independently to the fully relaxed state of the sealing tape or its arrangement within the joint, whereby a compression of 30% of the initial volume or height of the fully relaxed sealing tape is used as the reference point.

[0009] Preferably, the barrier layer consists at least partially of a material whose thermal conductivity decreases with increasing humidity. This prevents unwanted accumulation of humidity inside the sealing tape or on the adjacent side surfaces of the structural components at relatively high humidity levels inside the room, and enables controlled removal of humidity by diffusion through the sealing tape. At low humidity levels inside the room, moisture can then be (increasedly) removed from the sealing tape area, e.g., the masonry areas adjacent to the sealing tape.

[0010] The area of the barrier layer, which consists of the material whose WDD resistance reversibly changes with the air humidity (rev.WDD material), is arranged so that it partially or preferably completely penetrates the water vapor diffusion path. The rev.WDD material preferably predominantly penetrates the water vapor diffusion path, i.e. to ≥ 50-75% or ≥ 80-90% or particularly preferably ≥ 95% up to 100% of its cross-section (if necessary also to ≥ 20-35%). This can in each case also correspond to the extension of the barrier layer over the sealing tape cross-section. The sealing tape cross-section without a barrier layer can correspond to ≥ 1-2% or ≥ 3-5% of the sealing tape cross-section, if necessary also ≥ 7-10% of the same. If the tape is only partially penetrated by the barrier layer, if the rev.WDD material has a not too high WDD resistance, the water vapor diffusion through the sealing tape is at least predominantly determined by the WDD resistance of the polymer material. When selecting a rev. WDD material with a comparatively high WDD resistance, the water vapor diffusion can be essentially determined by the permeability of the remaining web (or generally the barrier-free area), so that in this way, namely by the properties of the barrier layer and its extension across the tape cross-section, the WDD resistance of the tape can be specifically adjusted. For example, the WDD resistances of a barrier layer at different air humidity levels can be selected such that at air humidity with low WDD resistance (e.g. high air humidity), the diffusion permeability of the barrier layer is significantly (e.g. predominantly) determined by the barrier layer, while at high WDD resistance (e.g.At lower humidity levels (e.g., at low air humidity), the same barrier layer then increases the diffusion permeability to a greater extent, for example, predominantly or almost entirely through the barrier-free cross-sectional area of the sealing tape. This also allows the properties of the sealing tape to be specifically adjusted.

[0011] The rev.WDD material preferably forms a layer of the barrier layer, preferably a continuous layer (hereinafter referred to as "barrier layer").

[0012] The barrier layer extends (if necessary in combination with the above) over preferably ≥ 30-40%, particularly preferably predominantly, i.e. ≥ 50-75% or ≥ 80-90%, particularly particularly preferably ≥ 95% to practically 100% of the sealing tape cross-section, relative to the sealing tape cross-section where the barrier layer is located. This can refer to the maximum relaxed state of the sealing tape in the joint (i.e., with uniform relaxation and complete filling of the joint) or the completely relaxed state of the sealing tape in a free arrangement.

[0013] The barrier layer is preferably designed as a continuous layer or film. This is preferably continuous across its surface without any perforations, i.e., preferably impermeable to air flow or air pressure (under the measurement conditions for the a-value according to DIN EN ISO 1026). However, such perforations can be provided if necessary, preferably completely covered by a material that has a water vapor diffusion resistance that does not change with air humidity or—if only partially extended—can be water vapor-tight. This material can, for example, also be layered and laminated with the layer of material with a reversibly changing water vapor diffusion resistance, or it can simply fill the perforations.This allows, for example, a minimum value of the water vapor diffusion resistance to be created by the additional layer with a constant water vapor diffusion resistance, allowing the sealing tape to be adapted to different requirements and environmental conditions. This additional layer can, for example, consist of a plastic material, in particular an air-impermeable material (impermeable to air flow).

[0014] The barrier layer particularly preferably has an s D value of 0.05 m to 100 m, preferably from 0.1 m to 25 m or from 0.2 m to 15 m (at 25% relative humidity (rel. LF), (the testing of the s D value is carried out as generally within the scope of the invention according to DIN EN ISO 12572) in order to be able to sufficiently control the water vapor diffusion. The s D value of the barrier layer is preferably ≥ 0.2-0.5 m or ≥ 1-2 m, the s D value can be ≤ 15-20 or ≤ 5-10 m, in each case at 25% rel. LF, in particular the s D value can be in the range of 0.5 m - 20 m or 1 - 10 m. Independently of this or in combination therewith, the barrier layer can have an s D value of 0.02 m - 10 m or 0.03 m - 6 m or 0.05 m - 2 m at 72.5% rel. humidity, according to DIN EN ISO 12572. For example, the sD value can be in the range of 1 - 10 m at 25% rel. humidity and in the range of 0.1 - 5 m at 72.5% rel. humidity.Unless otherwise specified in DIN EN ISO 12572, the s D values generally refer to a temperature of 20°C within the scope of the invention.

[0015] The sD value (water vapor diffusion value based on an air layer thickness in meters) of the barrier layer at 25% on the one hand and at 72.5% relative humidity on the other (each at 20°C) preferably differs by a factor of ≥ 1.1-1.2, preferably ≥ 1.5-2, optionally up to a factor of 3 to 5 or up to 10 to 20 or even up to 50 or up to 100 or 150 or more, thereby defining the dependence of the water vapor diffusion of the barrier layer on the air humidity. The difference between the two sD values of the barrier layer at the two specified relative humidities can be ≥ 0.25 m or ≥ 0.5 m or preferably ≥ 0.75-1 m, for example up to 5-10 m or up to 20-25 m or more.This results in a sufficient dependence of the water vapor diffusion resistance on different ambient conditions, for example, in summer or winter or in different climate zones, to achieve sufficient adaptation of the water vapor diffusion resistance to the ambient conditions, even with varying relative humidity. The sD value at 25% relative humidity is preferably the higher value than that at 72.5% relative humidity.

[0016] Preferably, the barrier layer consists at least partially of a synthetic, water-swellable polymer as rev.WDD material.

[0017] Particularly preferably, the barrier layer or a layer thereof consists at least partially of an ionomer material as a rev. WDD material. It has been found that, with such ionomer materials, the WDD resistance of the barrier layer, depending on the water vapor content typically encountered in the indoor climate inside buildings and / or in the atmospheric climate (outside the room), exhibits a sufficiently high dependence of the WDD resistance on the air humidity to achieve a sufficiently sensitive adjustment of the barrier effect during the changes in air humidity commonly encountered in practice.Furthermore, such layers of ionomer material have sufficient flexibility and sufficiently low flexural rigidity so that they can be folded easily enough and offer little or no resistance to relaxation of the foam material of the sealing tape from a compressed state (preferably a self-relaxation due to elastic restoring forces), thus at least not significantly impairing recovery (with regard to recovery time and / or recovery height).

[0018] According to another preferred embodiment, the rev.WDD material of the barrier layer consists of a polyamide material or EVOH (ethylene vinyl alcohol), although ionomer materials are generally preferred, particularly in view of the sensitivity of the material's WDD resistance to humidity. The rev.WDD materials can also be present as copolymers, for example, in the form of a polyether copolymer with incorporated ionomer components or a copolymer with polyethylene-polyacrylic acid copolymer components (particularly in the form of a polyether copolymer). The rev.WDD material can also consist of combinations of the aforementioned materials.

[0019] Such barrier layer materials which can be used according to the invention and have a moisture-dependent water vapor diffusion resistance are known, for example, from DE 19902102B4, DE 19514420 C1, DE 10239985 A1, DE 102008037292 A1, EP 1372956 A1, US 2005 / 0284096 A1, the disclosure content of which is hereby incorporated in its entirety by reference.

[0020] "Ionomer material" is understood to mean a polymeric material in which the polymer material contains ionic groups, in particular acrylate or methacrylate groups, which are each linked by chemical valence bonds to side chains or the backbone of the polymeric material. The polymer backbone is thus preferably negatively charged. The countercations to the polymer backbone are preferably selected from the group consisting of ammonium, lithium, sodium, potassium, magnesium, calcium, or zinc, or mixtures thereof, particularly preferably sodium and / or potassium, especially preferably sodium.

[0021] Specifically, with regard to the definition of the term "ionomers," reference is made to Römpp's Chemie-Lexikon, 9th edition, 1990, which defines these as random thermoplastic copolymers of (i) a monoolefin, (ii) a monoolefinic unsaturated acid, (iii) optionally further comonomers for modifying the chemical and physical properties of these copolymers, and (iv) the acidic groups of these copolymers are completely or partially neutralized with inorganic cations. By extension, this definition also includes non-random copolymers, for example, block polymers of a monoolefin and a monoolefinic unsaturated acid whose acidic groups are completely or partially neutralized with inorganic cations.It is understood that the terms "a monoolefin" and "a monoolefinic saturated acid" are to be understood independently of each other as meaning "at least one" and also include mixtures and / or copolymers thereof.

[0022] The ionomers used in the invention particularly preferably contain i) 50-99 mol% ethylene and ii) 1-50 mol% methacrylic acid, wherein iv) the acidic groups of these copolymers are neutralized by 0.5-100%, preferably 10-70%, with counterions.

[0023] The ionomer material used preferably contains no amide and / or urethane groups, which is ecologically preferable, for example, when the material is disposed of by incineration, with regard to the material's UV resistance, and with regard to a more highly adjustable dependence of the water vapor diffusion resistance on humidity, which is preferred for many applications with regard to sealing the wall construction area. The ionomer material is particularly preferably free of nitrogen or contains nitrogen at ≤ 3-5 wt.% or ≤ 0.5-1 wt.%, preferably ≤ 0.1-0.25 wt.%, based on the components released during combustion of the material in excess oxygen at 300°C (this is intended to distinguish it from polyamide or polyurethane materials, in which the water vapor diffusion resistance also changes with the relative humidity).

[0024] The barrier layer made of the rev.WDD material, in particular ionomer material, can have a thickness of 1 µm to 1 mm, preferably a thickness of 1-500 µm or 2-250 µm, particularly preferably in the range of 5-100 µ or 5-50 µ.

[0025] If necessary, the ionomer layer can also be present as a sheet-like impregnating material in which the amount of ionomers is 1-500 g / m2, preferably 2-100 g / m2.

[0026] The barrier layer can be multi-layered, in particular a multi-layer composite layer. At least one layer of at least one further material can be arranged on one or both sides of the ionomer layer or the rev.WDD layer. The one or both further layers, which partially or completely cover the ionomer layer or generally the rev.WDD layer, can protect and support the ionomer or rev.WDD layer and increase the stability of the barrier layer. The individual layers can each consist of the same or different materials, in particular on both sides of the ionomer or rev.WDD layer. The barrier layer preferably has an s D value that is below the lowest s D value of the ionomer layer or rev.WDD layer. If necessary, further layers of water vapor-permeable framework and / or processing aids can be provided.

[0027] The layers arranged on one or both sides of the ionomer or rev. WDD layer can, in particular, be nonwovens, woven fabrics, or grids made of inert materials such as polyethylene, polypropylene, polyester, glass fibers, or viscose, and optionally also perforated films, especially those made of polyethylene, polypropylene, or polyester. The layers can generally consist of any suitable material in layered form, preferably with s D values no higher than those of the ionomer layer or rev. WDD layer.

[0028] The ionomer material can be present as a blend or copolymer with other polymeric materials such as polyesters, polyamides, vinyl acetates, etc., as described, for example, in EP 1372956 A1. The proportion of ionomers in the blend can be 20-99.5 wt.%, for example, 25-95 wt.%, or pure ionomer can be used as the layer material.

[0029] The thickness of the layers of the barrier layer surrounding the ionomer material layer or rev.WDD layer can be a total of 10 - 2,000 µm, preferably 10 - 500 µm, in particular 10 - 250 µm, particularly preferably 10 - 90 µm, on each side independently of one another.

[0030] Within the scope of the invention, the ionomer layer or rev.WDD layer generally preferably forms a continuous, non-porous, and non-perforated layer; more preferably, it is at least substantially air-impermeable. The air permeability of the barrier layer or barrier layer can be ≤ 2-5 l / m2s or preferably ≤ 0.5-1 l / m2s or ≤ 0.1-0.25 l / m2s or particularly preferably ≤ 0.01-0.05 l / m2s according to DIN EN ISO 9237; test area 100 cm2 at a measuring pressure (negative pressure) of 0.5 mbar, test device Frank 21443, or it can be unmeasurable. These values can also apply at a negative pressure of 2 mbar. The specified standard and test conditions apply to all further air permeability measurements unless otherwise stated. The barrier layer, in particular in the form of an air-impermeable continuous layer, can at least substantially determine the tear strength and / or extensibility of the barrier layer (iethis layer alone has ≥ 50-75% or preferably ≥ 85-90% of the tensile strength and / or elastic modulus of the barrier layer as a whole).

[0031] The air permeability of the foam material forming the sealing tape body is preferably in the range of 5-1000 1 / m 2< s or 25-800 1 / m 2< s, which in combination with the barrier layer with rev.WDD material has proven to be particularly suitable with regard to the diffusion properties, preferably in the range of or 50-600 1 / m 2< s or 100-450 1 / m 2< s, if necessary also up to 2000 l / m 2< s. The air permeability specified in each case refers to the standard conditions (see above) of a 10 mm thick piece of foam (fully relaxed).

[0032] The barrier layer can be arranged or attached to the sealing tape in different ways.

[0033] According to the invention, the barrier layer is arranged in a notch in the foam material, so that the area of the barrier layer arranged within the notch is therefore arranged within the cross-section of the sealing tape. The barrier layer is thus protected within the notch from damage caused by external interventions to the sealing tape. Furthermore, the barrier layer can be easily attached to the sealing tape. In particular, this also allows the position of the barrier layer within the joint to be adapted to the respective requirements when the sealing tape is installed. For example, the barrier layer can be arranged at a distance from the side surfaces of the sealing tape facing the inside and outside of the room, so that the outside of the sealing tape is not influenced by the material properties of the barrier layer.Alternatively, the barrier layer can be arranged in a desired cross-sectional area of the sealing tape, for example, in its central region or adjacent to the side surface facing the inside of the room. This allows the water vapor diffusion characteristics of the sealing tape to be adjusted in relation to the joint depth, particularly with regard to the removal of water vapor from the masonry reveal or the like. The incision in the sealing tape therefore does not completely sever the sealing tape, but rather leaves a connecting foam web in the sealing tape, which integrally connects the two sealing tape areas opposite the incision. This also makes the sealing tape easy to manufacture, since a preform of the sealing tape foam body can be easily provided with the incision and the barrier layer can be inserted into it to produce the sealing tape.By closing the incision, the barrier layer is pre-attached to the sealing tape. This eliminates the need to handle multiple foam blocks that would have to be joined together to create the sealing tape (although this is possible in principle). Furthermore, the position of the incision can be varied in a variety of ways and adapted to specific requirements. Furthermore, the remaining sealing tape web acts as a kind of bypass to the barrier layer with regard to water vapor diffusion, which can be advantageous under certain conditions, such as temporarily very high water vapor exposure.

[0034] at an angle of ≤ ± 60° or ≤ ± 45°, preferably ≤ ± 30° to the normal, or at least essentially perpendicular to this, e.g. at an angle ≤ ± 10-15° or approx. 0° to it. The normal starts at the beginning of the incision (seen from the outside of the sealing tape). If the incision is arranged essentially vertically or has a slight transverse inclination, the barrier layer can also be introduced into the incision particularly easily, since the sealing tape can be laid down in a curve for this purpose. The incision is arranged on the outside of the curve so that it opens automatically due to the curved shape of the sealing tape. If the sealing tape is then arranged stretched out, the incision closes again, fixing the barrier layer.

[0035] Generally within the scope of the invention, the barrier layer can be fixed in position to the sealing tape by fastening means, for example by an adhesive, double-sided adhesive tape, suitable adhesives, mechanical means such as sewing, thermal fixing in the presence of thermoplastic fixing materials or the like.

[0036] Preferably, the incision is made on one of the wide sides of the foam strip, so that the incision can extend essentially along the height of the sealing strip (e.g., parallel to the side surfaces). The overall thermal conductivity of the sealing strip can thus be easily adjusted by the barrier layer.

[0037] If necessary, the incision can also be made on a narrow side of the sealing tape. This means that the barrier layer is subjected to pressure less in the planar direction of the layer and more in a direction perpendicular to the layer when the sealing tape is prefabricated or partially compressed in the joint. This allows the barrier layer to exhibit greater rigidity than in the above embodiment with the barrier layer extending with an incision on the wide side.

[0038] Furthermore, it is disclosed, but not according to the invention, that alternatively or optionally in combination with the further embodiments within the scope of the invention, in particular with the embodiments described above, the barrier layer can be arranged in a cut-through of the foam body, so that the foam body is therefore formed in at least two parts. The cut-through can extend in particular from broad side to broad side or from narrow side to narrow side or also from corner region to corner region (diagonal) of the foam body. In this case, the barrier layer can extend completely over the cut-through with respect to the sealing tape cross-section or only over a partial region thereof, leaving an area of the sealing tape free of a barrier layer.

[0039] For example, but also not according to the invention, the barrier layer can also completely penetrate the sealing strip from narrow side to narrow side, so that the foam body of the sealing strip can be composed of two parts.

[0040] In combination with the further embodiments within the scope of the invention, in particular with the embodiments described above, the barrier layer can at least partially cover a side surface of the sealing tape, i.e., be arranged on the outside of the sealing tape, which is particularly easy to implement in terms of manufacturing technology. The barrier layer can extend over ≥ 20-30% or over the majority of the sealing tape's side surface (i.e., ≥ 50-75% or ≥ 80-90%, or particularly preferably ≥ 95-100%).

[0041] Furthermore, in each case, with respect to the embodiments according to the invention, the barrier layer can additionally partially or completely cover at least one broad side of the sealing tape adjacent to the side surface. This can improve the attachment of the barrier layer to the foam body, particularly since the broad side is subjected to pressure when the sealing tape is mounted between the adjacent joint walls.

[0042] The barrier layer arranged in an incision of the sealing tape can also extend partially on the outside over the sealing tape side provided with the incision, for example the wide side provided with the incision or the narrow side provided with the incision.

[0043] The barrier layer section arranged on the outside of the sealing tape can be bonded to the sealing tape, for example, by adhering it to it using an adhesive layer, thus providing improved positional fixation of the barrier layer to the sealing tape. This can apply to the barrier layer section arranged on a narrow side and / or a wide side of the sealing tape (especially the latter).

[0044] Alternatively, the barrier layer can also at least partially cover the outside of the sealing tape. The barrier layer can here be part of a preferably openable wrapping that completely encloses the sealing tape. The barrier layer can here form the openable wrapping, i.e. completely enclose the sealing tape, optionally with an extension of the sealing tape at the connection point of the opposite sections of the barrier layer, between which the sealing tape is enclosed. The barrier layer can also be part of a multi-part wrapping, for example part of a wrapping film with other film sections than those from the barrier layer, wherein these other sections with a non-reversibly changing water vapor diffusion resistance depending on the air humidity can in particular cover the respective wide sides of the sealing tape, and optionally also the narrow side opposite the barrier layer.The barrier layer can also be part of a casing consisting of different sections, each of which is preferably arranged in different peripheral sections of the foam body. The different casing sections can be made of different materials and / or have different layer thicknesses. For example, one of the sections for fastening the sealing tape to a structural component such as a frame part can be designed or have a different function. This fastening region of the casing can have a higher rigidity than adjacent regions thereof, in particular than the casing section comprising the barrier layer. The foam body can be fixed in position in the casing, for example by means of an adhesive layer, which is preferably arranged in a region of the casing that does not comprise, or only partially comprises, the barrier layer.

[0045] The barrier layer, which at least partially covers the side surface, can also extend at least partially over the two adjacent broad sides of the sealing strip and be connected to the foam body on at least one or both broad sides in a way that absorbs tensile forces. Optionally, the barrier layer can also be connected along one or both longitudinal edges to another section of a different material, in particular a film section, wherein the film section is connected to the foam body in a way that absorbs tensile forces.

[0046] The area of the barrier layer located on the outside of the sealing tape can be covered by a fastening means, such as a self-adhesive layer, by means of which the sealing tape can be attached to a component or masonry, or simply to fix the barrier layer to the sealing tape. The covering side can, in particular, be a broad side of the sealing tape.

[0047] Within the scope of the invention, the barrier layer generally extends in the longitudinal direction of the sealing strip, so that the longitudinal edges of the barrier layer preferably extend in the longitudinal direction of the sealing strip, particularly preferably parallel to this.

[0048] The sealing tape can be in a compressed state, for example in the prefabricated state or in the installed position of the joint, before its resetting. If the barrier layer surrounds the sealing tape on the outside, an expansion reserve is preferably provided in the outer casing, which can encompass the barrier layer. The expansion reserve can be designed, for example, in the form of a fold. The expansion reserve means that the compressed foam body of the sealing tape can increase in volume without the casing being subjected to expansion. In the sealing tape according to the invention, according to a preferred embodiment, the barrier layer can be provided with the expansion reserve, for which purpose the barrier layer has sufficient flexural flexibility. This allows the barrier layer to combine several functions.According to another preferred embodiment, the expansion reserve is provided in a region of the casing that is different from the barrier layer. This allows the barrier layer and expansion reserve to be optimally adapted independently of each other to the respective requirements, for example, with regard to the barrier effect on the one hand and the flexibility of the expansion reserve on the other.

[0049] According to a preferred modification, the sealing tape can have different barrier layers with different reversible dependences of the water vapor diffusion resistance on the air humidity. These barrier layers can exhibit a dependence of the water vapor diffusion resistance on the air humidity at different ambient humidities, for example, one of the barrier layers at comparatively low air humidity and the other at comparatively high air humidity. Alternatively or additionally, the two barrier layers can have different dependencies of the water vapor diffusion resistance on the air humidity (i.e. different sensitivities), for example by ≥ a factor of 1.1 to 1.2 or ≥ 1.5 to 2 or preferably ≥ 3 to 5 or even ≥ 10. The difference in sensitivity can be ≤ 500 - 1,000 or ≤ 100 - 250, in particular also ≤ 50 - 75 or ≤ 10 - 20, possibly also ≤ 5 - 7.This always refers to room temperature (20°C). The difference in sensitivity can be determined particularly at a relative humidity of 50% at 20°C. For example, the barrier layer with a comparatively high WDD resistance can be arranged inside the room, and the one with a low WDD resistance outside the room. For example, the barrier layer with a comparatively high dependence of the WDD resistance on the relative humidity can be arranged inside the room, and the barrier layer with a relatively low dependence outside the room.

[0050] The invention further encompasses a wall structure with a sealing tape according to the invention arranged in a joint, wherein the sealing tape is preferably arranged in the joint such that the barrier layer is arranged in the joint facing the inside of the room with respect to the center plane of the sealing tape (arrangement of the center plane between the inside and outside side surfaces of the sealing tape). Preferably, the barrier layer is arranged on the inside side surface of the sealing tape or in an extension range of ≤ 25-33% or ≤ 10-20% with respect to the width of the sealing tape (extension of the sealing tape in the joint depth). This allows for functional removal of air humidity from the sealing tape to the outside of the room.

[0051] In particular, the wall structure can be part of a passive house or a full thermal insulation wall, where the problems arising from the task underlying the invention arise to a particular extent.

[0052] Preferably, the sealing tape is arranged in the joint between a frame component and the adjacent masonry reveal such that the sealing tape extends across the entire depth (from the inside of the room to the outside of the room) of the sealing area between the frame component and the reveal. However, if necessary, only a partial extension is possible, using additional sealing materials.

[0053] The invention is explained by way of example with reference to the following figures. They show: Figure 1-11 different versions of a sealing tape in cross section, whereby the Figure 6a - c and 7 show embodiments according to the invention. Figure 12an arrangement of a sealing tape in a joint in cross section.

[0054] Figure 1 shows a foam sealing tape 1, for example for sealing between two building parts 100 ( Fig. 11), in particular between a frame component and the masonry assigned to it. The sealing tape has opposite broad sides 2 which can be assigned to the building components and narrow sides 3 which run transversely to these. It is designed to be permeable to water vapor diffusion from one of the narrow sides to the other, with a continuous diffusion path 4. The narrow and wide sides define the foam body. The sealing tape 1 has a barrier layer 5 made of a material which is different from the foam sealing tape material and which extends at least partially over the cross-section of the water vapor diffusion path. The barrier layer here consists at least partially of a material whose water vapor diffusion resistance changes reversibly with the air humidity, in particular one which decreases its water vapor diffusion resistance with increasing air humidity.The material can be made at least partially or entirely of a synthetic, water-swellable polymer. Specifically, the barrier layer consists at least partially of an ionomer material, in particular, it comprises a continuous layer of an ionomer material. As stated above, other suitable materials can also be used.

[0055] Fig. 1 Like all other figures, it shows the sealing tape in a completely relaxed state outside the joint, unless otherwise stated.

[0056] According to the exemplary embodiment, the barrier layer has an SD value of 0.1 m to 20 m, specifically 5-10 m, at 25% relative humidity. At a relative humidity of 72.5%, the barrier layer exhibits a WDD resistance that is ≥ 1.1 times lower, specifically approximately 5-10 times lower, than at a relative humidity of 25% (relative humidity at 20°C in each case). The barrier layer can contain hydrophobic or hydrophilic agents, for example, in accordance with DE 10 2008 037 292 A1.

[0057] In addition to the layer of rev.WDD material, the barrier layer preferably comprises an additional layer of a material that supports and protects the rev.WDD material, e.g., a textile material such as a nonwoven or woven material. According to the exemplary embodiment, the barrier layer is surrounded on both sides by such material. However, since this material has (virtually) no influence on water vapor diffusion, the above information on water vapor diffusion also applies to the barrier layer.

[0058] According to Figure 1a The barrier layer 5, comprising the barrier layer made of a material whose water vapor diffusion resistance changes reversibly with changing humidity, is arranged on the narrow side 3 of the sealing tape, extending over the entire surface of the narrow side. The barrier layer can be fully bonded to the narrow side of the sealing tape or only in certain areas, for example, in the area of the two longitudinal edges of the barrier layer.

[0059] Figure 1b shows a modification according to Figure 1a, wherein the barrier layer 5 is connected at least on one, here on both, longitudinal edges 5a, 5b to a film layer 6 made of a different material, which results in a coherent film assembly. Preferably, the section of the barrier layer is continuously connected over its entire longitudinal edge to the film section of the other material. The other material of the film layer 6 is here, for example, one whose water vapor diffusion resistance is essentially independent of the air humidity; it can also have a different s D value or a dependence of the s D value on the relative air humidity than that of the barrier layer 5. The other material is pliable in this case; if necessary, it can have a certain flexural rigidity, as long as relaxation or expansion of the sealing tape from its compressed state is not prevented or hindered to such an extent that reliable function of the sealing tape is not guaranteed.The barrier layer is also preferably flexible, optionally also with a certain degree of flexural rigidity. The film composite is connected here to the two film sections 6 of the other material arranged laterally of the barrier layer with the sealing tape or the foam body thereof via the fastening areas 6a, in particular adhesively connected, for example by an adhesive layer such as a self-adhesive layer; the connection can generally be tensile force-absorbing. Optionally, alternatively or additionally, the film composite can be connected in the area of the barrier layer to the sealing tape (i.e., its body made of foam material) or to another area of the sealing tape.

[0060] Figure 2 shows a modification according to Figure 1 , according to which the barrier layer 10 extends only over a part of the height of the foam sealing tape. Furthermore, the above-mentioned Figure 1a, 1bThe above applies accordingly, as well as to all other embodiments or their modifications.

[0061] Figure 2b shows a modification of the sealing tape according to Figure 2a , according to which a film section of a further material is arranged on at least one or both of the longitudinal edges 10a, 10b of the barrier layer 10, here on the longitudinal edge that delimits the barrier layer over part of the height of the sealing tape. The other material of the further film section 6 (such as 1 with water vapor diffusion resistance independent of air humidity) can extend to the end region of the narrow side 3, and according to the exemplary embodiment, also over part of the adjacent wide side 2 or, if necessary, over a larger circumference of the sealing tape.

[0062] After Figure 3aThe barrier layer 11 extends over a narrow side 3 and (at least) partially over an adjacent broad side 2 of the sealing tape or the foam body thereof. The barrier layer 11 can be bonded to the sealing tape or the foam body over its entire surface or, for example, only in the region of its longitudinal edges 11a, 11b.

[0063] Figure 3b shows a modification according to Figure 3a , wherein the barrier layer 11 is connected at least on one side (possibly also on both sides) to another film section 6 of a different material. Section 6 extends (at least) partially over the broad side opposite the first broad side 2.

[0064] The statements according to Figure 2With regard to the formation of the other material, which shows practically no change in the WDD resistance with humidity, as well as its attachment to the barrier layer, apply to all embodiments of the invention, unless otherwise stated in the respective embodiments.

[0065] Figure 4 shows a sealing strip 1 in which the barrier layer 12 extends over a narrow side 3 and partially over both of the adjacent broad sides 2. If necessary, the barrier layer can also extend completely over one or both of the adjacent broad sides 2. According to Figure 4As is generally the case within the scope of the invention—in particular also with respect to the other exemplary embodiments—the barrier layer 12 is connected to the foam sealing tape 1 in the region of its two longitudinal edges 12a, 12b, optionally also in the section lying therebetween, optionally even over the entire surface. If the respective longitudinal edge of the barrier layer is connected to another material in a way that absorbs tensile forces, this longitudinal edge of the barrier layer can be connected to the foam sealing tape by means of the section of the other material, and the longitudinal edge of the barrier layer itself can be variable in position relative to the foam sealing tape, optionally also being adhered to it.

[0066] Figure 5shows a sealing tape 1 according to Figure 5a in a partially compressed state, for example, as assembled in a rolled-up state. The barrier layer 13 (or optionally also one or both of the film sections made of the other material) here has an expansion reserve 13c, e.g. in the form of a fold. The sealing tape can be compressed here to a volume of approximately 15-40% or approximately 25% of its volume in the completely relaxed state. The compression refers in particular to the (freely expanded) height of the sealing tape. The barrier layer can also extend partially or completely over one or both of the adjacent broad sides.

[0067] Figure 6ashows a sealing tape 1 in which the barrier layer 14 is inserted into an incision 7 (shown wider) in the sealing tape; the flanks of the incision can each rest at least partially or fully against the barrier layer, preferably on both sides. The barrier layer 14 is here fixed to the sealing tape within the incision, although this does not necessarily have to be the case for all applications. For this purpose, the barrier layer 14 is adhesively connected to the sealing tape at partial areas 14c thereof, for example by an adhesive layer, in particular a self-adhesive layer, or optionally (less preferably) by other means. The adhesive or adhesive layer is selected such that it is elastically deformable in order to enable compression and expansion of the sealing tape.The barrier layer 14 can be connected to the sealing tape in a tensile-absorbing manner, particularly at one or both of its end regions, in particular also at the end region arranged at the base 7a of the incision. If necessary, the barrier layer 14 can also be connected to the sealing tape in intermediate regions or over its entire surface. The barrier layer extends parallel to the narrow sides 3 of the sealing tape here. In the case of a substantially rectangular sealing tape, the barrier layer also extends substantially perpendicular to the broad sides 2 of the sealing tape or at least to one of the broad sides if the other broad side is profiled. According to this exemplary embodiment, as well as generally within the scope of the invention and the other exemplary embodiments, the barrier layer 14, in particular its barrier layer, consists of a deformable or pliable material, so that it can, for example, be folded.Such folding occurs when the sealing tape is compressed vertically, for example, during prefabrication, so that it can then relax once inserted into the joint. The broad side with the cut opening is provided with an adhesive layer 15 (in particular double-sided adhesive tape) with a removable cover 16 or another fastening means for attaching the sealing tape to a frame component. The adhesive layer or fastening means simultaneously holds the cut together; if necessary, an element can be provided in addition to the fastening element to hold it together.

[0068] Figure 6b shows a modification according to Figure 6a, after which the barrier layer 14 extends beyond the incision 7 on the outside of the sealing tape. For this purpose, the barrier layer 14 is folded over onto a broad side 2 of the sealing tape. Here, the folded area 14d is connected to the sealing tape or the foam body thereof in a tensile-absorbing manner, alternatively or in addition to the barrier layer area arranged within the incision, in particular adhesively, particularly preferably by means of an adhesive or self-adhesive layer. If appropriate, the barrier layer area 14d arranged outside the incision can also extend over a further circumference of the sealing tape. The adhesive layer simultaneously serves to fix the barrier layer, or more precisely the section of the barrier layer arranged on the broad side, to the sealing tape.

[0069] After Fig. 6cThe barrier layer is folded within the incision, i.e., it is designed in two or more layers, with a fold in the area of the base of the incision. The fold can be arranged in the area of the base of the incision or at a distance from it. One or preferably both longitudinal edges 14e of the barrier layer can protrude from the sealing tape and can each be folded over towards the associated (adjacent) narrow side. If necessary, one of the longitudinal edges 14e can also be arranged within the incision and the other outside the incision. The two edge-side sections 14d are arranged on both sides of the incision, i.e., folded over on the outside of the sealing tape towards the front and rear narrow sides of the sealing tape in the installed position. Independently of the areas of the barrier layer arranged outside the incision, the layer can also be arranged in two or more layers within the incision.One of the broad sides, here the one with the cut opening, is provided with an adhesive layer 15, for example, a double-sided adhesive tape, and an outer cover layer 16, for example, silicone paper. If necessary, the adhesive and cover layers can also be arranged on the other broad side. This can also be applied to the other embodiments of the invention, in particular according to . Fig. 6 , 7 , 12 , apply.

[0070] Figure 7 shows a modification of the sealing tape according to Figure 6 (corresponding modifications according to Figure 6a, 6b ), according to which the notch 7 is made obliquely in the sealing strip, thus forming an angle to the two opposite broad sides. This angle can, for example, be in the range of 20-70° or approximately 30-60° or approximately 45°. For the embodiments according to Fig. 7 The possible barrier layer projections as described above also apply, for example after Fig. 6b and 6cThe adhesive layer such as self-adhesive and cover layer (or general fastening means) can be Fig. 6 be provided, on the side of the incision mouth or on the other broadside.

[0071] According to the Figure 6 and 7 the incision 7 extends only over part of the height of the sealing tape, so that a web-shaped transition area 1a of the sealing tape remains, which integrally connects the two foam sealing tape areas arranged on the inside and outside of the barrier layer.

[0072] According to non-inventive modifications of the embodiments of the Figure 6 and 7 Instead of the incision, a complete severance 18 of the foam sealing tape can be provided, thus also with complete severance of the transition area 1a, as in Fig. 8 to various embodiments, which modifications of the Figure 6a and7 represent (it goes without saying that corresponding modifications of the other examples are also possible, in particular the Figure 6b, 6c The barrier layer can extend over the entire height of the sealing tape or the cut 18, or only over a portion of it, leaving a barrier-free area 18a of the cut. Adhesive layers with cover layers or other fastening means can be provided on both broad sides if necessary.

[0073] According to a further modification, the non-inventive cut 18 or the incision 7 can end in the corner area of the sealing strip or the foam body or be directed towards it ( Fig. 8c). Here, too, the barrier layer can extend over the entire height of the cut or, forming a barrier-layer-free region 18a, only over a portion of the cut. In an embodiment not according to the invention, the sealing tape can thus be made from at least two individual (independent) foam sealing tape sections. The barrier layer can extend over the entire width (toward the broad side of the sealing tape) of the cut, but optionally also (in the case of a completely continuous cut of the sealing tape) only over a portion of the cut (and thus also only over a portion of the cross-sectional extent of the cut).

[0074] The Figure 9, 10 show a foam body 1 in a tear-open wrapping 9, wherein according to Figure 9at least a partial section 9a thereof (optionally the entire tear-open wrapping) comprises or consists of the barrier layer. However, it is sufficient to arrange the barrier layer only in the area of one or both of the narrow sides of the sealing tape, preferably the narrow side facing the inside of the room, and to let the other sections of the wrapping consist of other materials. The barrier layer here extends over one narrow side and at least partially around at least one (here: both) wide sides. The tear-open wrapping is then otherwise formed from a different material. For this purpose, the other material is connected to both longitudinal edges of the barrier layer in a way that absorbs tensile forces, and the two sections 9b made of the respective other material are joined together in a connecting area 9c, so that the compressed foam sealing tape is held together by the tear-open wrapping, whereby the tear-open wrapping can also be constructed differently.The tear-open wrapper can be opened by releasing the connection point, for example, by pulling on the two end areas. The connection can be formed, for example, by a melted bond between the film sections, by an adhesive, by stitching, or the like, as known to those skilled in the art. Perforations are provided at points 9d to facilitate opening of the wrapper.

[0075] Figure 10 shows a modification according to Figure 9 , wherein a section of the tear-open wrapper 10 consists of a region 10a of higher flexural rigidity than the pliable film sections 10b of the other material according to Figure 9(for example one with WDD resistance that is not dependent on air humidity) and the section 10c with barrier layer. The comparatively rigid section 10a can, for example, be used for attachment to a frame component. Preferably, this section still has such low flexural rigidity that the sealing tape can be made up as a roll. The barrier layer 10c extends over a partial area or the entire narrow side of the sealing tape. The barrier layer can - as shown here - be directly connected to the material with higher flexural rigidity 10a (for example by a fusion bond, sewing, gluing or the like), if necessary also with the interposition of another material, for example a flexible material. If necessary, however, the areas of the casing that do not consist of the more rigid material can each consist of a rev.WDD material, also made of various rev.WDD materials.

[0076] Figure 11shows a further embodiment in which the foam sealing tape is provided on a first narrow side 3a with a first material section 16a with a WDD resistance that changes reversibly with the air humidity, and on the second narrow side 3b with a second material section 16b with a WDD resistance that changes reversibly with the air humidity, wherein the two materials differ in the WDD resistance at a given temperature and air humidity (for example, 20°C and 25% relative humidity or 20°C and 75% relative humidity) or in a different sensitivity of the change in the WDD resistance with the air humidity. For example, the first material section can have a WDD resistance value of 2m at 20°C and 25% relative humidity, and the second material section can have one of 10m.This means that the tape can be used flexibly in different environmental conditions, on the one hand to allow air humidity to be dissipated from the sealing tape to the outside, and on the other hand to limit, for example, the penetration of air humidity from the outside into the tape interior. This can be advantageous if, on the one hand, water vapor should be dissipated to the outside when air humidity is low outside (for example in winter when outside air humidity is very low), and on the other hand, air humidity from the outside should be prevented from penetrating the sealing tape (for example in summer when outside air humidity is high). It goes without saying that a sealing tape of this type can also be manufactured according to the various designs, in particular according to the . Figure 1-10, can be realized by selecting corresponding arrangements of the barrier layer made of the first and second materials (in each case independently with respect to the individual embodiments). Thus, one of the two barrier layers or both barrier layers can also be arranged in a respective incision or cut, or combined accordingly.

[0077] Figure 12 shows an arrangement of a sealing tape in a joint 101 in a completely (uniformly) relaxed state, with the sealing tape still partially compressed (for example, to approximately 30% of its height in a completely relaxed state). The joint is formed between the two components 100. The sealing tape is arranged here between the interior side Ri and the exterior side Ra of the room. The barrier layer 5 is arranged here on the interior side of the room. This can apply to all embodiments.

[0078] According to all embodiments, the sealing tape is impregnated for delayed recovery, as is preferably generally within the scope of the invention.

Claims

1. Foam sealing tape (1), for example for sealing between two construction parts, in particular between a frame component and the masonry wall associated therewith, wherein the sealing tape has opposing broad sides (2), which can be associated with the construction parts, and narrow sides (3) extending transversely with respect thereto, and is designed to be permeable to water vapour diffusion from one of the narrow sides to the other, and wherein the sealing tape also has a barrier coat (5) which is made from a material different from the foam sealing tape material and which extends at least partially over the cross-section of the water vapour diffusion path (4), characterised in that the barrier coat is arranged in an indentation in the foam material and consists at least partially of a material which reversibly changes its water vapour diffusion resistance with the humidity, and in that (i) the sealing tape has a sealing tape body made from foam material and the air permeability of the foam material forming the sealing tape body is in the range from 100-800 l / m2s according to DIN EN ISO 9237, test surface 100cm2 at a measurement pressure of 0.5 mbar, testing device Frank 21443, of a 10 mm thick piece of foam (completely uncompressed), and / or (ii) the air permeability of the barrier coat is ≤ 2 l / m2s according to DIN EN ISO 9237, test surface 100cm2 at a measurement pressure of 0.5 mbar, testing device Frank 21443, and / or (iii) the barrier coat consists at least partially of an ionomer material of which the polymer structure is negatively charged, and / or (iv) the barrier coat at least partially covers a lateral surface of the sealing tape, wherein additionally the barrier coat partially or completely covers at least one broad side of the sealing tape adjoining the lateral surface.

2. Sealing tape according to claim 1, characterised in that the barrier coat consists at least partially of a material which reduces its water vapour diffusion resistance with increasing humidity.

3. Sealing tape according to claim 1 or 2, characterised in that the barrier coat consists at least partially of a synthetic polymer which swells on contact with water.

4. Sealing tape according to one of claims 1 to 3, characterised in that the barrier coat consists at least partially of an ionomer material or a polyamide.

5. Sealing tape according to one of claims 1 to 4, characterised in that the barrier coat has a continuous coat consisting of an ionomer material or a polyamide.

6. Sealing tape according to one of claims 1 to 5, characterised in that the barrier coat has an SD value of 0,05 m to 100 m.

7. Sealing tape according to claim 6, characterised in that the indentation is positioned on a broad side or a narrow side of the foam material tape.

8. Sealing tape according to one of claims 1 to 7, characterised in that the barrier coat at least partially covers the sealing tape on the outside and is part of a covering which completely surrounds the periphery of the sealing tape.

9. Sealing tape according to one of claims 1 to 8, characterised in that the foam material of the sealing tape is impregnated for delayed recovery.

10. Sealing tape according to one of claims 1 to 9, characterised in that the sealing tape has at least two barrier coats which in each case consist at least partially of a material which reversibly changes the water vapour diffusion resistance of the coat with the humidity, and in that the two barrier coats of different materials have different changes of the water vapour diffusion resistance as a function of the humidity.

11. Sealing tape according to claim 10, characterised in that the two barrier coats are arranged along the water vapour diffusion path and spaced apart from one another by the sealing tape.

12. Wall structure with a foam material sealing tape arranged in a joint according to one of claims 1 to 11, characterised in that the sealing tape is arranged in the joint in such a way that the barrier coat is arranged in the joint and directed into the interior in relation to the central plane.

13. Wall structure according to claim 12 as a wall structure of a passive house or a fully thermally insulated wall.

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