EP2554773A2 - Sealing tape and construction with such a sealing tape - Google Patents

Abstract

The sealing tape (1) comprises two opposite lying broad sides (2,3) for sealing contact at the two components, and two narrow sides (4,5) connected to the broad sides, on which a space interior side and the other space exterior side are arranged. The area of one of the narrow sides is provided with a coating material (10). The sealing tape is resiliently formed. The coating material is an activatable coating material, which is transferred starting from a preactivation condition by the activation of the coating material into a sealing condition. Independent claims are included for the following: (1) a building joint comprises a gap; and (2) a method for sealing of building joints between a primary component and a secondary component, such as a frame profile and a wall portion.

Description

The invention relates to a joint sealing strip for sealing a building joint between a first component and a second component such as a frame profile and a wall portion, wherein the sealing strip has two opposite broad sides for sealing contact with the two components, and two narrow sides connecting them, one of which space inside and the other room outside can be arranged, wherein at least the region of one of the narrow sides is provided with a coating material, and wherein the joint sealing tape is preferably formed delayed delayed resilient.

Such sealing tapes are widely used, for example, to seal used in masonry openings objects such as windows and doors relative to the window reveal to seal joints between two adjacent components, such as adjacent wall parts, and the like. Here, the joint sealing tape must meet a variety of requirements, for example, in terms of air permeability, watertightness, water vapor permeability, reliability of the seal against the adjacent components, UV resistance, aging resistance and the like. In addition, the production of the sealing strip should be inexpensive.

To meet these requirements different joint sealing strips have been proposed. So it is from the DE 87 15 499 U1 known to meet the requirement profile, the joint sealing tape form zones of different foam materials, namely zones of closed-cell and open-cell foam zones, which can be permanently connected to each other, for example glued, be. As a result, the inner and outer regions of the sealing strip can be adapted to different requirements, but the production is comparatively complicated and expensive. Furthermore, it is from the EP 1936246 A2 known to provide on the narrow sides of the tape films, which are adhered to the broad sides of the tape, which, however, manufacturing technology is extremely expensive. From the DE 200 09 674 U1 It is known to produce composed of several strips sealing strips with intervening barrier layer, and this is very expensive to manufacture.

Furthermore, generic jointing tapes are usually impregnated to achieve a delayed recovery, in particular homogeneously impregnated throughout. The compressed sealing strip then returns after pressure relief only over a period of time to seal the gap, so that the compressed sealing strip can be arranged in the building joint, which facilitates its assembly. The joint sealing tape is delivered in the compressed state, usually as a roll, so that after unrolling and cutting then due to the delayed reset sufficient time remains to arrange the sealing tape in the building joint, for example, pre-mounted on a frame profile such as a window or door frame. On the other hand, this requires that the treatment of the sealing strip to meet its complex requirement profile with respect to the sealing properties to the conditions of assembly under delayed provision is adjusted. Thus, when rolling up or assembling the sealing tape for transport, this is often compressed to about 15 to 25% of its original height, and decompressed when relaxing in the joint again with a large increase in volume. Thus, for example, the joint sealing tape on a narrow side with an air and / or water vapor diffusion-tight (or -hemmenden) film provided, so the usually thin film is also very much deformed, so there is a risk of the formation of cracks, including microcracks or other damage to the film, so that the assembled sealing strip is impaired in its function. The same applies if the sealing tape is treated with a material that is not sufficiently elastic, which covers regions of the sealing tape such as its side surface or regions within the pores thereof, for example closes pores in a film-like manner, so that this material is likewise damaged in the compression / decompression, for example by introduction from cracks in the material. If the coating material is applied in a high thickness, this may undesirably affect the recovery properties of the sealing tape. On the other hand, in principle it is possible to provide the joint sealing tape on the surface after its complete recovery in the building joint with a coating material, for example with a suitable tool such as brush or job roll. However, this is on the one hand very time-consuming, on the other hand, there is a risk of contamination of adjacent components such as the adjacent frame profile.

The invention has for its object to provide a jointing sealing tape, which reliably provides a high air-tightness and / or high water vapor diffusion (WDD) resistance even after compression of the sealing strip for mounting in the building joint and which is easy to handle during installation.

The object is achieved by a joint sealing strip, which is provided with an activatable as needed coating material, which is converted from a pre-activation state by the activation in a sealing state or is transferred to the sealing state, a narrow side coating with increased airtightness and / or increased WDD Resisting the condition prior to activation. The activation of the coating material and transfer to the sealing state is in this case possible at any time or is carried out (or the sealing strip according to the invention is adapted for this purpose), in particular after arrangement of the sealing strip in the joint. Preferably, the activation of the arranged in the joint sealing tape is carried out after (only) partially or after full recovery of the joint sealing strip in the building joint, so that the sealing tape sealingly on the building structure defining surfaces of the respective components, such as a window or door revealing and a frame, is applied. The transfer of the joint sealing strip in the sealing state is thus decoupled from the provision, and thus by the unwinding of a roll, or generally by a packaging of the sealing strip in its application feasible. The activation of the sealing tape for the transfer of the same in the sealing state of the coating is thus preferably generally within the scope of the invention, regardless of the provision or a triggering of the provision of the sealing tape feasible. The activation of the sealing strip for transferring the same into the sealing state of the coating can thus be carried out, for example, at a point in time and / or by measures which are independent of the return or a triggering of the return of the sealing strip. In particular, the said activation can preferably be carried out at any time after the start of the triggering of the recovery of the sealing strip or at any time after complete recovery of the sealing strip, in particular after complete recovery of the sealing strip in the joint. The sealing strip is designed according to the invention for this purpose. This does not exclude that said activation may optionally also be initiated with the beginning of the triggering of the recovery of the sealing strip or during the return of the sealing strip, for example, delayed in time to this. As a result, therefore, a reliable seal is ensured by the sealing tape. Furthermore, the sealing tape is as such before introduction into the Building joint or before its provision already provided with the coating material, namely with the coating material in the pre-activation, whereby a subsequent application of the coating material to the sealing tape on site is no longer necessary. The sealing tape may be factory provided with the coating material.

Advantageous embodiments will be apparent from the dependent claims.

The coating material located in the pre-activation state preferably does not influence or only insignificantly influences the recovery behavior of the joint sealing tape, for example delays the return speed of the joint sealing tape to ≦ 20-40% or ≦ 5-10% or 1.5-3% in relation to the maximum decompression state on the total recovery time. This can be done at room temperature (20 ° C) at 50% relative humidity. The compressed sealing tape (initial state of decompression) may e.g. be compressed to 5-50% or 10-40% or 20-30% of the volume from the fully relaxed sealing band. After the (full) reset, the sealing tape may then be activated to provide increased airtightness and / or increased WDD resistance.

Preferably, the sealing strip provided with the coating material in the preactivation state is storage-stable, and therefore also does not change the properties of the coating after storage for ≥ 2-5 hours or ≥ 10-20 hours, preferably not for storage ≥ 2-5 days or 2-4 weeks or up to 2-4 months or up to 6-12 months or longer when stored at 20 ° C and 50% relative humidity. This includes that, under the stated conditions, the weight of the sealing tape also changes by ≦ 10-20% or ≦ 5-8% or ≦ 1.5-3% by moisture absorption / release, more preferably by ≦ 0.5-1 %. As a result, the sealing tape can be used, if necessary, after cutting to length practically without causing a sequence of processes associated with the change in weight, such as drying of the sealing strip, must be maintained. The atmosphere which is in exchange during storage with the sealing strip is dimensioned so large that the atmosphere does not change due to the above-mentioned storage of the sealing strip, for example in its chemical composition, ie in contrast to a coating composition which changes or sets by air drying. The sealing tape is preferably present without an envelope enclosing this partially or completely, for example film wrapping, in particular preferably not on the side surface provided with the coating material. This is particularly preferred for the introduced into the joint state of the sealing strip (immediately) before its activation. However, the exception is a protective film on one or more (self) adhesive layers for fastening the sealing strip to at least one of the two components, in particular to the frame.

The coating material is preferably thermally and / or chemically reactive and / or radiation-activated. The activation may be irreversible, in particular chemically irreversible under conditions of use of the sealing tape. The conditions of use may refer in particular to 20 ° C, 50% relative humidity, normal composition of the air at sea level. In the case of thermal activation, this is preferably irreversible with respect to the area distribution, that is to say with regard to the distribution of the coating material on the narrow side of the strip, it being irreversible then that the original distribution of the coating material is not recovered by a temperature change.

Particularly preferably, the coating material has as at least one component a thermally activatable coating material or a mixture of a plurality of components of thermally activatable coating materials. For example, the multiple components may have different melting or softening points exhibit. According to a preferred variant, the thermally activatable coating material is uniformly arranged on the sealing strip by the thermal activation and conversion into the sealing state, for example by at least partially melting particles applied in particle form and resulting in a seal to form a melt layer after cooling. "Thermally activatable" means that this is preferably activated by heat above room temperature (20 ° C), for example, is a meltable under heat introduction or at least partially fusible material. "Thermally activatable" preferably also means that the thermal activation takes place without chemical reaction of the coating material, more preferably without chemical reaction with a supplied from outside the sealing tape and / or without chemical reaction with a present within the sealing tape reactants. The coating material is preferably designed such that an increase in temperature of the coating material to ≥ 40-45 ° C or ≥ 50-55 ° C is required for thermal activation, optionally also ≥ 60-70 ° C, preferably 70-90 ° C, so that sufficient difference to room temperature is given to avoid unwanted activations, possibly already at ≥ 35 ° C. An activation temperature of ≤ 140-150 ° C or ≤ 120-100 ° C, optionally of 70-90 ° C, is preferred in order to prevent damage to the sealing tape or adjacent components due to excessive heat input. The activation temperature may therefore be, for example, in the range of 40-150 ° C or 50-140 ° C, in particular 60-140 ° C or 60-120 ° C. The melting point or melting range of the thermally activatable coating material may be ≥40-45 ° C or ≥50-55 ° C, optionally ≥60-70 ° C, preferably 70-90 ° C, optionally ≥35 ° C. The melting point or melting range of the thermally activatable coating material may be ≤ 140-150 ° C or ≤ 120-100 ° C. The melting point or melting range may therefore be, for example, in the range of 40-150 ° C or 50-140 ° C, in particular 60-140 ° C or 60-120 ° C.

According to another preferred embodiment, the coating material has as at least one component a coating material which can be activated by a chemical reaction or a mixture of a plurality of components of coating materials which can be activated by chemical reaction. The multiple components may e.g. be chemically reactivated by different reactants, e.g. by reaction with water or by reaction with oxygen. The "chemical reaction" is thus preferably such by reacting the coating material already applied to the sealing tape with external reaction components, ie components from outside the sealing tape, with which the sealing tape is acted upon for activation. The method according to the invention for sealing a building joint can thus generally also include the application of the sealing strip with a chemical reactant supplied from outside the sealing strip as variant 1. The reactant may already be present in the atmosphere surrounding the sealing tape, e.g. Water in the form of atmospheric moisture, or added to the atmosphere, e.g. a volatile reactant such as an alcohol, ester, aldehyde, ketone, amine, etc., especially alcohol, or additional water, for example, by humidifying or applying moisture to the sealing tape. Optionally, as variant 2, the initiation of the activatable chemical reaction can also include reactants which are completely predetermined on the sealing strip and are introduced into the joint together with the sealing strip. There may also be a combination of variants 1 and 2.

Optionally, it is also conducive to increasing the temperature of the coating material for the initiation of the chemical reaction (however, no thermal reaction takes place by thermal activation alone, or at least only to an extent which is due to the change in property of the sealing tape such as air permeability and / or water vapor diffusion (WDD )-Resistance has no or no significant influence). Reference is made to the temperature data for the thermal activation in relation to variants 1 and 2, the thermal activation can thus be carried out in each case at a temperature of ≥ 40-45 ° C or ≥ 50-55 ° C, optionally ≥ 60-70 ° C, preferably 70-90 ° C, optionally ≥ 35 ° C. The thermal activation can take place at ≤ 140-150 ° C or ≤ 120-100 ° C. The thermal activation is thus for example in the range of 40-150 ° C or 50-140 ° C, in particular 60-140 ° C or 60-120 ° C. The chemical system can therefore be activated in the stated temperature range, so that after activation the chemical reaction preferably takes place within a period of ≦ 2-4 hours or ≦ 0.5-1 hour or preferably ≦ 10-30 minutes. Optionally, the reaction temperature can be adjusted by using suitable catalysts, preferably in the coating material or generally in the sealing tape.

According to a further preferred embodiment, the coating material has as at least one component a radiation-induced activatable coating material or a mixture of several components of radiation-activatable coating materials. The multiple components may e.g. be activated at different wavelengths and / or radiation intensities.

Optionally, the joint sealing tape may also comprise a plurality of differently activatable coating materials of the three types mentioned in combination, e.g. According to one variant, both one or more thermally activatable coating materials and one or more radiation-induced activatable coating materials or according to another variant both one or more thermally activatable coating materials and one or more activatable by chemical reaction coating materials.

According to one variant, the coating material is particularly preferred (Coating material in Voraktivierungszustand) particulate applied to the sealing tape. The coating material may be present during application in the form of a bulk material, in particular free-flowing bulk material such as granules, powder or powder, or in the form of the solids content of a dispersion, preferably an aqueous dispersion. The particulate coating material ensures that, on the one hand, the coating material in the preactivation state is not changed by the compression of the joint sealing tape during its manufacture during production, for example production of a wound tape take-up roll, on the other hand, the recovery behavior of the sealing tape is not changed by the particulate coating material.

The coating material is preferably applied in the pre-activation state on the compressed sealing strip, which may be assembled in the compressed state as a roll. The sealant tape may be compressed to between 5-75% or 5-50% or preferably 10-40% or 20-30% by volume of the coating material in the preactivation state relative to its fully reset condition. This is especially true in the application of a particulate coating material. On the one hand, this is particularly preferred in terms of manufacturing technology, and on the other hand, this makes it possible to apply a sufficient amount of coating material.

In the context of the invention, the activation preferably takes place on the sealing strip arranged in the joint, particularly preferably on the sealing strip which is partially or particularly preferably in the joint, on the sealing strip which is completely set back in the joint. In particular, this applies in each case independently for the thermal activation, the chemical activation and the radiation induction. The fully recessed sealing band then fills the joint completely. The activation and sealing by the coating material then takes place independently of changes such as or changes in the state of the sealing tape during recovery. Optionally, the activation step can also be carried out with only partial recovery of the sealing strip, if the clearance between sealing tape and joint limitation to ≥ 5% or ≥ 10-25% or ≥ 50-75% is filled by its provision.

In general, the particles of the coating material used according to the invention may have an average diameter of up to 0.5-0.75 mm or up to 1-1.5 mm or optionally also up to 2-3 mm or more, the average particle diameter being ≥ 1 May be -5 microns or ≥ 10-50 microns or even ≥ 100-250pm in order to apply sufficient coating material on the sealing tape can. These sizes can each independently apply in particular if the particles are applied only superficially on the sealing tape side surfaces such as in particular thermally activatable coating materials, in particular fusible materials such as waxes. In particular, when the particles are at least partially embedded in the foam material of the sealing tape, these may have an average diameter of up to 0.05-0.075 mm or up to 0.1-0.25 mm, and possibly also beyond, the average particle diameter can here be ≥ 0.1-0.5 microns or ≥ 1-5 microns, so that a certain penetration of the foam material and at the same time still sufficient introduction of material is made possible in the sealing tape. The average particle diameter is preferably in the range of 0.1-2500 μm, in particular 0.2-2000 μm or 1-2500 μm or 10-2500 μm or in particular 100-2500 μm. The particle diameter may also be ≦ 100-150 μm or ≦ 10-50 μm. The average particle diameter may be in the nanometer range, for example in the range of 10-1000 nm for special applications, it may be ≥ 10 -50 nm or ≥ 100-200 nm or even ≥ 500 nm, which may apply in particular in sealing bands of fine-pored foams of low air permeability, or in general when using dispersions as a coating, for example dispersions of by radiation crosslinkable polymers.

The particle diameter is generally preferably ≥ 1-5 μm or ≥ 10-20 μm or ≥ 50 μm. On the one hand, this allows the particles of the coating material to penetrate easily into the foam material of the sealing tape so that the sealing tape is not only superficially modified by the coating material, e.g. on impregnation as a dispersion, on the other hand, high particle sizes cause a sufficient amount of coating material to be deposited on or near the side surface of the belt, thereby permitting a continuous coating. Particles having a mean diameter in the range of 100-1,500 μm or 200-1,500 μm, in particular 200-1,000 μm or 500-800 μm, have proven to be particularly preferred, in particular in the case of superficial adhesion to the sealing tape side surface.

Preferably, the particulate coating material is applied in one (only one) layer on the sealing tape side surface or is applied in only one layer on the sealing tape side surface, wherein the coating material may possibly slightly penetrate into the foam material of the sealing band body, preferably less than a pore depth or middle Pore diameter of the foam material. The coating material may generally, in particular in this embodiment of the sealing strip, be adhered to the sealing tape side surface by means of an adhesive. The adhesive force of the coating material particles with each other can be significantly lower than the adhesive force by means of the adhesive, so that the particles optionally have virtually no adhesion effect with each other. Such a sealing tape can be produced, for example, by applying a sealing tape provided on a side surface with adhesive to a layer of the coating agent (produced, for example, by a filling) so that the coating agent particles adhere to the sealing tape side face. This adhered layer is then substantially a monolayer (that is, a layer of only one layer of the particles), so that the coating material particles are adhered next to each other close to the side surface. Alternatively, the coating material can also be produced by application to the adhesive tape provided with an adhesive, if applicable, and removal of coating material excess, for example mechanically by brushing or by an air flow. This also essentially produces a monolayer of the coating material. The adhesive may be a material which preferably does not affect the recovery behavior of the sealing tape on the side surface, for example an oligomeric material (more than 5-10 monomers) or polymeric material (more than 20-100 monomers), preferably an acrylate. The coating material is preferably applied to a sealing strip compressed as described above, in particular to a sealing strip which is preformed for storage under compression and which can be compressed to 5-50% or 10-40% or 20-30% of its volume. The sealing tape can be compressed when exposed to coating material and packaged as a roll.

If the coating material is applied in the form of particles to the sealing tape, so preferably under a uniform distribution of the particles over the side surface, since then a uniform sealing layer can be easily produced by the material, but also an uneven distribution is possible.

The adhesive described above may be a fusible material which is solid at 20 ° C or at 30-40 ° C and in at least softened or at least partially melted state (ie at 20 ° C or 30-40 ° C elevated temperature) for Adhesion with the coating material is contacted with this. The melting point of the adhesive is preferably less than that of the coating material, for example, ≥10-20 ° C or preferably ≥30-45 ° C. The adhesive may optionally also be a soluble, in particular water-soluble, adhesive, which is contacted in at least partially dissolved state for adhesion to the coating material with this.

The adhesive may be used in an amount of 5-2000 g / m ² or 10-1000 g / m ² or preferably 10-600 g / m ² or 20-400 g / m ² or especially 50-300 g / m ² on the Be applied sealing tape. This refers to the order quantity in the fully expanded state of the sealing strip. It has been found that, on the one hand, such an amount / m ^{2 is} usually sufficient to adhere the coating material reliably, in order to effect a sufficient increase in airtightness and / or WDD resistance, on the other hand small enough not to the recovery behavior of the sealing strip adversely affecting and can be relatively easily adhered to the sealing tape.

Generally, the pre-activation coating material may be unevenly distributed over the narrow side (which includes non-uniform distribution with respect to projection on the side surface in the area of which the coating material is disposed, for example in a layer of the sealing tape parallel to but laterally spaced in particular, the coating material may be arranged unevenly distributed on the narrow side, for example in regions of greater and lesser layer thickness (including area-wise coating-free), wherein the coating material in the sealing state a relation to the Voraktivierungszustand more uniform distribution over the respective side surface or has uniform distribution on the respective narrow side, for example, in a more uniform layer thickness. The layer thickness in the regions of lesser layer thickness can be so low that there is an increased air and / or water vapor permeability, the uniformed layer thickness being sufficiently thick is to provide a sealing condition with sufficiently low air and / or water vapor permeability for the requirements. This can be achieved, for example, in the case of a thermally activatable coating material by melting the coating material or at least thermal conversion into a pasty state so that coating material spreads on or over the side surface of the band when transferred to the sealing state and thereby distributed more uniformly (spread over the side surface). should include that the coating material spreads in a projection on the side surface, so for example in a layer parallel to the side surface within the sealing tape). This can be achieved, for example, by a softening of the coating material, in particular to such high temperatures, that contiguous subregions of the coating material (such as particles) intermesh, sinter together or adhere to one another, or, on recovery of the band, expand with the band in the surface, eg "pulled apart" by the return of the tape and thereby increase its surface area over the side surface. A locally "non-uniform" distribution of the coating material is also present if it is applied particulate on the side surface, since in the adjoining region of the particles there is de facto a smaller layer thickness of the material than in the center of the particles. Alternatively, for example, a sealing material such as a wax in spaced-apart small areas or in the form of surface areas with gaps or openings on the sealing tape side surface can be applied, for example by application as a melt (an adhesive layer is then possibly not provided), for example in the manner of a printing process. The surface areas may also have a width of ≥ 1-2 mm or ≥ 3-5 mm, preferably ≦ 10-15 mm or ≦ 20 mm.

Alternatively or additionally, the coating material in the pre-activation state as a film on the respective narrow side of the sealing tape, this pre-activated film having a significantly lower air permeability and / or reduced WDD resistance to the film in the sealing state after its activation. Independently of this, the film in the preactivation state may have a higher elasticity and / or elasticity than the coating material in the sealing state, which here may likewise be present as a film. The coating material film in the preactivation state may have an elasticity ≥ 1.5 times or ≥ 2-3 times or preferably ≥ 5-7 times or particularly preferably ≥ 10-15 times or else ≥ 20-50 times higher elasticity (determined as ( correspondingly smaller) Young's modulus at a given layer thickness) than the coating material film in the sealing state. Irrespective of this, or even in combination, these relations of ≥ 1.5-fold or ≥ 2-3-fold or ≥ 5-7-fold, or more preferably 10-15-fold or ≥ 20-50-fold also for the higher elasticity (determined as elongation at break) of the film in the pre-activation state relative to the sealing state apply. Optionally, independently of one another, the elasticity and / or extensibility (preferably elongation at break) in the preactivation state can be up to 100-500 times or preferably up to 1,000-5,000 times or particularly preferably up to 10,000-50,000 times or up to 100,000 times. 500,000 times or even greater than in the sealing state. The elasticity and / or the extensibility (preferably elongation at break) in the preactivation state can therefore be, for example, in the range from 1.5 to 500,000 times or 2 to 100,000 times greater than in the sealing state, for example in the range from 5 to 100,000 times or 10 -100,000 times, possibly even 10-5,000 times. The coating material in the state of sealing may have a tensile strength F _max in the range of 5-150 N or 7-100 N, preferably 8-50 N, particularly preferably 12-40 N, for example 15-35 N. This can be a dense for many applications and at the same time sufficiently stable and flexible "outer skin" of the sealing tape are provided. The elongation at break ε-F _max can be in the range of 35-95%, preferably 40-90% or 45-85% lie. This can apply in particular to radiation-activatable or chemically activatable coating materials, particularly preferably to radiation-activatable, in particular UV-activatable, coating materials. The values given refer in each case to a sample with a width of 5 mm and a thickness of 1 mm and a measurement according to DIN EN 12311-2 / Method B (Dec. 2000), which generally applies within the scope of the invention.

By activation of the activatable coating material, a continuous film is formed on the narrow side of the sealing strip which can extend over a part or the entire side surface. Optionally, surface areas of the coating material may also be formed by activation, continuous or continuous or non-contiguous, covering the side surface by more than 50% or ≥75%, preferably ≥85-90% or more preferably 95-98%. This may apply from a particulate or film-coated coating material, without being limited thereto.

According to another preferred embodiment, the coating material may be applied in the pre-activation state in the form of a layer or film on the narrow side, which preferably continuously and completely covers the side surface of the belt. The coating material may in this case be in the form of a preferably aqueous solution or dispersion, in particular a film-forming solution or dispersion, or it may itself be a liquid or a composition which can be applied in the form of a film. Optionally, the applied film may cover the side surface by more than 50% or ≥75%, preferably ≥85-90%, or more preferably ≥95-98%. The film is preferably continuous, possibly continuous or non-contiguous. The applied coating material film is formed before transfer into the sealing state storable and transportable (eg by Drying of the solution or dispersion), that is preferably bound (ie does not change its water content and / or other properties or not essential in the above-described outsourcing, ie for example by ≤ 10-20% or ≤ 2-5%), and / or is on adhering to the narrow side, so preferably does not adhere to the other object when contacting with another object such as a protective film.

The air-tightness and / or the WDD-resistance of the sealing tape with the coating material in the sealing state is preferably ≥ 1.1 times or ≥ 1.2-1.5 times, preferably ≥ 2-3 times, particularly preferably ≥ 5-10 -fold or ≥ 15-20-fold, if necessary also ≥ 50-100-fold higher than that of the sealing tape with the pre-activated coating material, optionally ≤ 500-1,000-fold or ≤ 5,000-10,000-fold or ≤ 25,000-fold or higher, if necessary also ≤ 100-250-fold. This applies independently of each other for the difference of the coating material in the preactivation state and the sealing state for the change of the airtightness on the one hand and the WDD resistance on the other hand. The airtightness and / or the WDD resistance in the preactivation state can therefore independently of one another be, for example, in the range of 1.5 to 25,000 times or 2 to 10,000 times greater than in the sealing state, for example in the range of 5 to 5,000 times or 10-5,000-fold, possibly even 10-1,000-fold. The comparative values of airtightness and / or the WDD resistance in the sealing state and Voraktivierungszustand are determined at the same temperature and humidity, for example at 20 ° C, 0% / 50% relative humidity, in particular 50% relative humidity.

The thermally activatable coating material is preferably activated by heating to temperatures of ≥ 40-45 ° C or ≥ 50-55 ° C, optionally also when heated to temperatures of ≥ 60-70 ° C, preferably 70-90 ° C, optionally ≥ 35 ° C. Preferably, the thermal activation takes place at Temperatures of ≤ 140-150 ° C or ≤ 120-100 ° C. The thermal activation can thus take place in the temperature range of 40-150 ° C or 50-140 ° C, in particular 60-140 ° C or 60-120 ° C. If the thermal activation of the coating material takes place by melting or softening thereof, the temperatures mentioned preferably relate to the melting or softening point of the coating material. The thermal activation can consist in the fact that the coating material is converted by the heating in a softening or melting state (in this case, if necessary, the film of the sealing tape sufficiently occlusive film arise). The coating material may then self-spread on the side surface of the belt or spread, if necessary, it is sufficient if the softened coating material spreads with the recovery of the tape over the side surface of the tape, ie by adhesion to the recovering tape, or with the aid a suitable tool such as a spatula (but preferably automatically without tools). In this case, it may be sufficient if the coating material is only partially converted to the softening or melting state. Thus, the coating material may contain other components, such as fillers, UV-absorbing particles such as titanium dioxide (eg as anti-aging agent), flame retardants, including intumescent or the like, which are not changed in their properties by the thermal activation. Fillers, such as mineral fillers, may be conducive to facilitate heating of the belt due to their heat capacity and to avoid too rapid cooling. The fillers, in particular mineral fillers, may be present, for example, in a content of ≥ 5-10% by weight or ≥ 20-25% by weight, preferably ≥ 35-50% by weight or else ≥ 60-70% by weight. be contained in the foam body of the sealing strip, preferably independently or in combination with one of the aforementioned lower limits in a content of ≤ 70-80 wt .-% or ≤ 50-60 wt .-% or optionally also ≤ 30-40 wt. -%, where the Weight refers to the total weight of coating and impregnating masses of the foam body, that is, including impregnations for delayed recovery, side surface coatings or other distributed in the pore structure of the sealing body introduced materials. The values of upper and lower limit can be realized independently of each other. The filler content may therefore be, for example, in the range of 5-80 wt .-% or 10-70 wt .-%, in particular in the range of 20-60 wt .-% or 25-50 wt .-%. This filler content may also be present in sealing tapes according to the invention of the two other types of activation (radiation-induced or chemically reactive), in particular since heat and thus the heat capacity of the sealing tape can also be supportive of activation.

Waxes, in particular microcrystalline waxes or hard waxes, including mixtures thereof, can be used as the thermally activatable coating material. The melting point or melting range of the wax or waxy mixture may be ≥40-45 ° C or ≥50-55 ° C, optionally ≥60-70 ° C, preferably 70-90 ° C, optionally ≥35 ° C. The melting point or melting range of the wax or waxy mixture may be ≤ 140-150 ° C or ≤ 120-100 ° C. The melting point or melting point range can therefore be in the temperature range of 40-150 ° C or 50-140 ° C, in particular 60-140 ° C or 60-120 ° C. If the coating material is converted into its softening range by the thermal activation, then, starting from room temperature (20 ° C.), the strength of the coating material (for example tensile strength or flexural strength) can be ≥10-20% or preferably ≥30-50%, particularly preferably ≥75 -100% or ≥ 150-200%, possibly also ≥ 500% be reduced.

As waxes, in particular microcrystalline waxes, for example, natural waxes such as carnauba wax or synthetic waxes such as waxes or based on of organic polymers, for example PE waxes, polyether wax or the like can be used. Preferably, the thermally activatable coating materials, optionally the particulate coating materials according to the invention in general, an isometric shape, in particular spherical shape, which facilitates the coating and optionally impregnation with this material. Optionally, the coating materials may also be shaped irregularly or non-isometrically, for example in the form of granules or flakes.

Another variant of thermally activatable coating materials are, for example, thermally crosslinkable oligomers or polymers, which may thus have, for example, unsaturated bonds which react with one another by thermal energy supply with crosslinking of different molecules, wherein the coating material may then include, for example, suitable catalysts.

A chemically reactive coating material according to the invention is one in which the coating material is converted by chemical reaction from its pre-activation state into its sealing state. The chemical reaction may include, for example, a hydrolytic cleavage, which reaction may be triggered by moisture absorption, for example, from the air or by application of a dampening solution. For example, this polyurethane systems or other systems can be used, which are converted by reaction with atmospheric moisture, for example by hydrolytic cleavage, a precursor. The precursor can then be converted by other reactions such as polymerization, crosslinking and / or condensation reactions in a setting state, in which therefore the coating material is in the sealing state. The further reactions can be carried out with other precursor molecules or with other educts. For example, by means of the humidity under at least partially hydrolytic reaction form isocyanate groups of polyurethane precursors chain extensions and / or crosslinking of polymers. The urethane systems can be one- or two-component systems.

Alternatively or in combination, for example, epoxide systems can be used in which components carrying epoxide groups carry out, polymerize and / or crosslink chain extension reactions under chemical reaction with components containing hydroxyl groups and / or moisture.

It is particularly advantageous alternatively or in combination with the said systems to use moisture-curing polyurethane resins which undergo crosslinking reactions with absorption of moisture (H ₂ O uptake). These polyurethane resins may be isocyanate-free. For example, silane-terminated polyurethanes (SPUR) having terminal silyl groups, in particular alkoxysilyl groups such as trimethoxysilyl groups, can be used. Silane-terminated polyurethane backbones may be present here. With absorption of moisture, the silyl groups or alkoxysilyl groups hydrolyze with formation of crosslinking sites which can crosslink with other components, for example under polycondensation with other silane-terminated polyurethane molecules. As complete as possible end capping of the polyurethanes with the silane compounds leads to the most complete curing coatings. These urethane systems can be one- or two-component systems.

Furthermore, for example, coating materials containing silanes such as primary aminosilanes (eg aminoalkyltrialkoxysilanes such as gamma-aminopropyltrimethoxysilane) can also be used as adhesion promoters, for example in silane-modified urethanes (SPUR prepolymers). Alternatively, for example, silicones, epoxy compounds or used become.

For example, radiation-crosslinking or curing polymer systems can be used as the radiation-induced activatable coating materials, the activatable coating material can thus be or contain a plastic material which can be cured or crosslinked by radiation, in particular UV radiation or IR radiation, in particular UV radiation , For example, such polymer systems may be urethane systems, acrylate systems, urethane-acrylate systems or, in particular, polyether-urethane-acrylate systems. The systems mentioned may optionally contain further copolymers in each case. In particular, polyether-urethane-acrylate polymers can be used as radiation-induced activatable coating materials.

The radiation-induced activation can generally be carried out in the context of the invention using UV radiation, for example UV-A, UV-B or UV-C, so that UV-curable polymer systems are particularly preferably used. In particular, radiation in a wavelength range of 1-450 nm (still including the violet range), in particular 50-450 nm or 100-450 nm can be used as UV radiation, in particular 200-400 nm. Alternatively or additionally, activation can also be used IR radiation done.

Such systems may contain one or more photoinitiators or a thermally activatable catalyst. As photoinitiators in particular peroxides and / or amines can be used.

It is understood that the coating compositions may contain other components such as plasticizers, adhesion promoters, fillers, stabilizers, catalysts and the like.

The coating material is preferably of a basis weight of 10-2000 g / m ² applied to the side surface of the belt. This refers to the completely reset state of the sealing tape, that is, when this has completely relaxed without further pressure, for example after a period of ≥ 1-2 days or ≥ 5-10 days at room temperature (20 ° C) and 50% relative humidity , In a prefabricated tape, for example a rolled up under compression sealing tape, as it is present after its production for storage and / or transport, results in a correspondingly higher basis weight of the coating material. In the prefabricated state, the sealing tape can be compressed, for example, 5-45% based on its initial state, for example in the range of 5-40% or 10-30%. In particular, the coating material with a weight per unit area of ≥ 20-50 g / m ² , preferably ≥ 75-100 g / m ^{2 may be} applied to the side surface of the completely expanded band, optionally also with a basis weight of ≥ 500-1000 g / m ² or else ≥ 2000 g / m ² . In this way, on the one hand in many applications, a sufficient increase in the air-tightness and / or the WDD resistance can be achieved, on the other hand, excessive amounts of the coating material on the side surface of the tape can be avoided, which involve the risk that the coating material is not completely through the respective Measure (such as thermal activation, radiation induction, triggering of a chemical reaction, etc.) is transferred to its sealing state, so then the respective property of the sealing tape could be outside desired tolerances, or a coating applied in excess coating material disturbs the joint seal.

The coating material may have a basis weight of ≦ 5000 g / m ² or ≦ 2000-3000 g / m ² , preferably ≦ 1500-1700 g / m ² or ≦ 1000-1250 g / m ² on the side surface of the belt in the fully expanded state thereof, optionally also in an amount of ≦ 300-500 g / m ² or ≦ 100-200 g / m ² . The coating material may be in an amount of 10-1000 g / m ² or preferably 10-600 g / m ² or 20-400 g / m ² or in particular 50-300 g / m ² applied. By the amount of the applied coating material per square meter, the properties of the sealing strip, in particular airtightness and / or WDD resistance, can be adjusted specifically, optionally independent of the respective properties of the sealing strip without coating material. Also, this does not unduly influence the return behavior of the sealing strip.

The coating material can be superficially applied to the side surface of the sealing tape or be, for example, only superficially or (additionally) superficially. For this purpose, for example, the side surface can be provided with an adhesive and the coating material, for example in powder or powdered state, be applied to the side surface of the belt, for example by sieving, wherein the coating material can be pressed to increase the adhesion to the side surface. Optionally, the sealing tape provided with the adhesive can be pressed or pressed into the coating material. If appropriate, the coating material can also penetrate (only) slightly into the sealing strip, for which purpose the coating material is applied to the side surface of the sealing strip, for example in the form of a dispersion, preferably an aqueous dispersion. Preferably, the treatment is carried out such that the coating material only by ≤ 1 / 8-1 / 10, preferably ≤ 1 / 12-1 / 16 or even by ≤ 1 / 20-1 / 30 of the width of the sealing strip (distance side surface side surface ) penetrates into this. If appropriate, the coating material, for example a particulate coating material, can also be incorporated mechanically into the foam for this purpose. In this way, a defined overall profile of the air permeability and / or the WDD resistance of the sealing strip can be produced. Thus, it can be ensured that the activation of the coating material for transferring the same into the sealing state over the entire depth of the sealing strip extends, in which coating material is provided, and unactivated areas, which would lead to undefined properties of the tape are avoided. Optionally, the coating material can also extend over up to 1/4 or up to ½ of the width of the sealing strip (side surface side surface area) or optionally also over the entire width of the sealing strip, so that the sealing strip is continuously homogeneously provided with the coating material, ie its entire cross section and entire length. Regardless of this - which may also apply generally in the context of the invention - the coating material can also be introduced into the sealing strip only at a depth of up to 5 mm or up to 2-3 mm or up to 1-1.5 mm starting from the side surface be, for example, only in a depth of up to 0.5-0.75 mm. As a result, the profile of airtightness and / or WDD resistance in the region of the sealing strip side surface can be adjusted in a targeted manner. This can in each case be given if the activation of the coating material can be carried out in a simple manner over the entire width or the entire cross section of the sealing band, in particular in the case of thermal activation or in the case of narrow sealing bands, without being limited thereto.

As a "narrow sealing tape", for example, one with a width of up to 2-4 cm or even up to 6-8 cm are considered. Optionally, the width of the sealing strip (distance narrow side-narrow side) in the invention but also up to 10-15 cm or up to 20-25 cm amount. Independently of this, it may also be advantageous to provide the sealing tape homogeneously with the activatable coating material over its entire width, for example by impregnation. In this way, if necessary, the coating material can be transferred by activation in its sealing state, over a portion of the thickness or the entire thickness of the sealing strip, so for example in a zone area starting from the respective side surface or over the entire transverse extent and length of the sealing strip. This can be beneficial when the sealing tape is to be used for various applications, for example in buildings, which are exposed to different climatic conditions, so that either a higher airtightness (coating material in the sealing state) or lower airtightness (coating material in the pre-activation state) is given or, correspondingly, a higher or lower WDD Resistance of the sealing tape. Furthermore, this can also be selectively activated depending on the arrangement of the sealing strip at the respective region to be sealed, for example, when the sealing strip is used to seal on the outside, for example in the area between a frame part such as window or door frame and a wall cladding such as an insulating layer on the one hand or but to a space inside seal or a seal between the frame and Mauwerksleibung. Depending on the requirement profile, the sealing strip can then be in its pre-activated state or in its sealing state when the building is finished (that is, ready for construction).

The air permeability of the sealing tape body forming foam material (before its impregnation, eg for delayed recovery, and before application of the coating material) is preferably in the range of 5-2000 1 / m ² s, so that in combination with the coating according to the invention with respect to the joint seal an advantageous embodiment. Under certain circumstances, the air permeability may be higher. Unless otherwise stated in the context of the invention, the air permeability given in each case refers to the standard conditions of a 10 mm thick piece of foam (fully relaxed) at a measured negative pressure of 0.5 mbar, test area 100 cm 2; Frank device 21443; DIN EN ISO 9237 (these conditions also apply to all further details of the air permeability in the context of the invention). According to a preferred variant, the air permeability of said foam material ≤ 125-150 1 / m ² s or preferably ≤ 75-100 1 / m ² s, optionally also ≤ 40-50 1 / m ² s, for special applications particularly preferably also ≦ 20-25 1 / m ² s. This is a sealing tape, which is particularly preferably used for special applications, with an already very low air permeability and / or high WDD resistance of the band can be further selectively adjusted by the coating material or set to extremely low values in the sealing tape, Nevertheless, the tape is preferably delayed delayed resilient impregnated, so targeted in the joint is resettable. As a result, the joints can be provided with a profile of the air permeability and / or the WDD resistance over the joint depth (ie from side surface to side surface of the sealing strip), in which the inside air-tightness and the WDD resistance is higher than on the space outside region of the sealing strip (in each case "inside denser than outside"), which already have room inside very low airtightness / water vapor permeability and yet a defined profile of these sizes can be generated. The coating material here is preferably only superficially arranged on the sealing strip or in a layer which is near the surface with respect to the side surface, for example at a depth of ≦ 1/8-1 / 10 or ≦ 1 / 12-1 / 16 of the width of the sealing strip. Regardless of this - which may also apply generally in the context of the invention - the coating material can be introduced only in a depth of up to 2-3 mm or up to 1-1.5 mm starting from the side surface in the sealing strip, for example, only in a depth of up to 0.5-0.75 mm. As a result, the profile of airtightness and / or WDD resistance in the region of the sealing strip side surface can be adjusted in a targeted manner. The coating material may in this case be provided in the region or on one or both narrow sides of the strip, preferably only on or in the region of a narrow side, which is preferably arranged on the inside of the room when the strip is mounted. Both narrow sides can be provided with the same viewing material or with different coating materials. On both narrow sides, the respective coating material in different quantities per unit area be applied to the narrow side and / or in different layer thicknesses. Optionally, the sealing tape may be continuously impregnated homogeneously with the coating material over the cross section.

According to an alternative preferred embodiment, the foam material of the sealing tape has an air permeability of ≥ 150-175 1 / m ² s, for example ≥ 200-220 1 / m ² s, optionally up to 800 1 / m ² s or up to 1000 1 / m ² s or up to 2000 1 / m ² s (in each case before its impregnation, eg for delayed recovery, and before application of the coating material). According to a first preferred sub-variant, the coating material is introduced into the sealing tape only over a depth of up to 1/10-1 / 12 of the width of the sealing strip, if appropriate also only up to 1/16-1 / 25 of its width, preferably ≦ 1 -2% of the width of the sealing strip, possibly even only superficially. As a result, the air permeability and / or the WDD resistance in the region of the side surface can be adjusted in a targeted manner. Despite in itself relatively low WDD resistance within the band, which allows a quick removal of water vapor, the band on a narrow side, for example, inside space, have a very high diffusion resistance and / or very high air resistance, thus practically tight even at high air pressure on the tape be, preferably coupled with a delayed reset. Optionally, the sealing tape may also be provided with coating material over ≥ 1/8 of the depth thereof, for example up to ¼ or ½ of its width, optionally evenly received uniformly over its entire cross section, in particular if the coating material is in the form of a dispersion in the sealing tape is introduced. As a result, the airtightness and / or the WDD resistance of the sealing strip can be controlled or adjusted independently of the airtightness of the foam material used by the coating material.

The coating material to be used according to the invention is preferably selected such that, when it is activated and transferred from the preactivation state to the sealing state, its volume is less than or equal to 3-5 times or less than or equal to 100-200% or preferably less than or equal to 30-50%. relative to its volume before its activation changes. As a result, the sealing tape can seal the joint reliably and controlled after activation, without being disturbed by the increase in volume. This is the case with the embodiments described in the context of the invention.

Generally within the scope of the invention, the sealing tape can be provided in the region of one or both narrow sides with the coating material, preferably only on or in the region of a narrow side, which is preferably arranged on the inside of the room when the tape is mounted.

In general, in the context of the invention, the coating material for adjusting the air-tightness and / or the WDD resistance of the sealing strip is different from any means used for impregnating the sealing tape for delayed recovery. The coating material used in the invention preferably has no significant effect on the retarded release properties of the sealing tape, preferably less than 25-33% or less than 10-20%, more preferably ≦ 3-5%, of the delayed recovery effect in each case with respect to a change in the reset time, starting from a defined state of compression in a defined state of relaxation of the band. Preferably, in this case, the defined state of relaxation is the state of the completely reset band and the defined state of compression is that of compression, e.g. 20% of the volume of the tape emanating from the fully reset condition.

Preferably, the foam of the sealing band body is at least one partially or totally open-pore foam, which has at least a certain air permeability, preferably ≥ 5 1 / m ² s. Preferably, the foam is open-pored in such a way that the sealing band body is continuously impregnated or impregnated over its entire cross section and its entire length, in particular impregnated for delayed recovery. Optionally, the foam may be closed-pored with respect to air permeability. However, a foam which is considered to be closed-pored may also still have a certain water vapor permeability, so that even with such a foam the WDD resistance (as equivalent air layer thickness) of the sealing stiffener can be increased by means of the coating material. The WDD resistance of the foam material (raw state) can be in the range of 0.05-25 m, preferably in the range of 0.1-10 m, particularly preferably in the range of 1-10 m.

Preferably, in the sealing state, the coating material forms a continuous film on the sealing tape side surface so that the pores of the sealing tape adjacent to the side surface are almost completely closed, preferably ≥ 50-75% or ≥ 80-90% or more preferably ≥ 95-98% or until to 100%, based on the area occupied by the coating material total area of the sealing strip narrow side in relation to the total area of the sealing tape narrow side. This refers in particular to conditions of 20 ° C / 50% relative humidity and the fully restored sealing strip at the maximum predetermined joint width for which the sealing tape is used or to a provision up to max. 50% of the volume that the sealing tape has at full recovery. However, an increase of the airtightness and / or the WDD resistance by the coating, which is already sufficient for certain applications, can also be given if ≥ 50-60% or preferably ≥ 70-80% or particularly preferably ≥ 85-90% of the side surface of the sealing tape covered by the coating material, under the conditions mentioned. In the sealing state, the applied coating material preferably also covers the pore cell walls at the sealing tape side surface inwardly and outwardly, for example, in contrast to the case of a homogeneous impregnation of the sealing tape wetting the cell walls, wherein the pores remain substantially permeable to air.

In the state of sealing, the coating preferably has a layer thickness of ≥ 0.05-0.1 μm, preferably ≥ 0.1-0.25 μm or ≥ 0.5-1 μm, more preferably 2-5 μm or ≥ 10 μm. Thereby, the reduction of the air permeability and / or increase of the air resistance can be adjusted. Furthermore, it can be ensured with layer thicknesses of ≥ 0.25-0.5 microns that the formed film of the coating material is not too sensitive to damage and this ensures a reliable seal. The thickness of the coating agent film is preferably ≦ 1,500-2,000 μm or ≦ 200-1,000 μm or preferably 75-100 μm or ≦ 25-50 μm, if appropriate also ≦ 10-15 μm, so that the coating agent film is cracked due to layer thicknesses which are too large and thus loses its defined properties. The thickness of the coating agent film may thus be in the range of 0.05-2000 μm or 0.5-1000 μm, preferably in the range of 0.5-500 μm or 1-200 μm, in particular 2-200 μm or 5-100 μm or 10-100 μm. The specified layer thickness can refer in particular to a provision of the sealing strip at the maximum predetermined joint width for which the sealing strip can be used or to a provision of up to 50% of the sealing strip volume with full recovery. Preferably, the foam of the sealing band body is a flexible foam, in particular flexible polyurethane foam.

Particularly preferably, the sealing tape is impregnated for delayed recovery, for example by means of acrylate-containing impregnating agent or other suitable impregnating agent. Preferably, in the fully retracted state of the strip, the ratio of the width of the sealing strip broad side to the width of the sealing strip narrow side (extent perpendicular to the longitudinal direction of the strip) is ≥ 0.3-0.5 or ≥ 1-1.5, particularly preferably ≥ 2-2, 5 or ≥ 3-4, usually ≤ 10-15 or ≤ 20-25.

Preferably, the coating composition is not tacky in the activated state and / or sealing state, the coating material therefore does not constitute an adhesion-activatable coating. The adhesion is in particular so low that it can not hold the sealing strip pressed against a smooth surface (eg made of metal or ceramic) Thus, the weight of the tape is higher than a possible adhesive force. Preferably, the sealing tape on the narrow side provided with the coating material in the installed state is not externally provided with an additional layer, e.g. a mesh or textile layer. This may apply in each case to thermally, chemically reactive or radiation-activated bands, in particular thermally activatable bands.

Preferably, the sealing tape in the pre-activation state has a low volatile content, including water, of ≦ 10-15% by weight, preferably ≦ 4-5% by weight, particularly preferably ≦ 1-2% by weight or ≦ 0.25%. 0.5 wt .-%, or virtually no volatiles, each based on the total weight of the sealing strip, so that no moisture or volatile components are introduced into the joint with the sealing tape. This is particularly preferred for the sealing tape in the storable state and / or before even a partial onset of activation. The above statement of the volatility relates in particular to an aging at 40 ° C, 25% rel. Humidity, static air and a voluminous atmosphere whose composition does not change when volatilized components.

The sealing tape can be a rectangular (including square) or profiled cross-section, so that when introducing the sealing strip in the joint areas of different compression arise, for example as in the EP 1 811 111 A1 or the DE 10 2008 020 955 A1 whose disclosure content is hereby included.

Furthermore, the invention comprises a building with a first and a second component, between which a joint is arranged or formed, wherein the joint can extend continuously over the depth of the two structural parts or over only a part thereof. In this case, a sealing strip arranged in the pre-activated state is included in the invention by the invention. On the other hand, a sealing tape according to the invention arranged in such a building joint comprises in the sealing state. In particular, the building joint may be, but is not limited to, a component connection joint, the joint of a component transition, or a component penetration (e.g., in the case of a frame used in a component opening or masonry opening, such as a door frame or door frame).

Furthermore, the invention comprises a method for sealing a building joint between a first and a second component, in particular between a frame profile and a masonry reveal, according to the invention in the building joint, a sealing tape with an activatable coating agent is introduced, and wherein the arranged in the joint sealing tape as needed is transferred by activation from its pre-activation state in its sealing state. "When needed" means that activation may preferably be temporally independent of any other process step, including regardless of the method of manufacturing the sealing tape and / or attaching the sealing tape to the first or second component and / or introducing the sealing tape into the joint to be sealed ,

Generally, the invention preferably comprises at least two time-separated steps: 1. application of the coating material to the sealing tape, 2. activation of the coating material. The activation is preferably carried out by active energy supply (beyond a general energy exchange of the sealing tape with the environment) and / or by a chemical reaction, preferably with one from outside the sealing tape to the provided on the sealing tape coating material reactants or already provided on the sealing tape reactants ,

The method comprises applying or attaching the sealing tape in the pre-activation state to the first or second component, for example to a frame profile, e.g. a window or door frame. The attachment comprises a pre-assembly which allows the sealing band to be positioned together with the associated component to form the joint on the other component, e.g. a frame profile is inserted into a masonry opening.

The inventive method comprises independently of or in combination with the above, that the coating material is activated before positioning the sealing strip in the joint between the first and second component.

The inventive method preferably comprises generally in the context of the invention that the transfer of the joint sealing strip in the sealing state decoupled from the provision, and thus also from the unwinding of a roll, or generally of a packaging of the sealing strip in its application is performed. The activation of the sealing strip for the transfer of the same in the sealing state of the coating can thus be carried out generally within the scope of the invention, independently of the provision or a triggering of the provision of the sealing tape. The activation of the sealing tape for the transfer of the same in the sealing state The coating can thus be carried out, for example, at a time and / or by measures which are independent of the provision or a triggering of the provision of the sealing tape. In particular, the said activation can preferably be carried out at any time after the start of the triggering of the recovery of the sealing strip or at any time after complete recovery of the sealing strip, in particular after complete recovery of the sealing strip in the joint.

Particularly preferably, the inventive method comprises independently of or in combination with the above-mentioned that the coating material after the positioning of the sealing strip in the joint between the first and second component (in particular after inserting a frame with sealing tape in a masonry opening) is activated, in particular preferred in that the coating material is activated after a partial or complete recovery of the sealing tape in the joint. A full recovery of the sealing tape is done when the sealing tape completely fills the joint and closes. If the activation of the coating material already takes place after only a partial reset of the sealing strip, then the activation time should preferably be selected such that a complete recovery of the sealing strip in the joint takes place before the coating material is predominantly or completely transferred to its sealing state.

Preferably, the process step of activation (thermal, chemical or by radiation) of the sealing strip is carried out when the sealing tape is completely returned within the joint, so the fugue completely fills and seals. The activation of the coating material may optionally be carried out before the complete recovery of the sealing strip in the joint, for example, if the sealing material is arranged directly in the joint or has been only slightly or only partially reset, for example only up to 30-50% or up to 60-75% or 80-90% in relation to the complete filling of the joint, starting from the state of restitution with which the sealing tape is introduced into the joint, which can be done in particular in cases when the recovery of the band to seal the joint is sufficiently rapid and the activation state (before reaching the sealing condition) is maintained for a sufficient time. Optionally, the activation can also take place before the sealing tape is introduced into the joint, in particular if the coating material is still in its activation state with the activation state maintained for a sufficiently long time before the sealing tape is completely returned in the joint, that is, if the coating material is still sufficiently softened, for example. in order to be able to follow a recovery of the sealing strip, and the sealing strip is mountable, before it is converted into its sealing state.

According to the invention, the sealing strip can be introduced into the building joint in the preactivation state and the sealing strip introduced in the joint can be converted into its sealing state by activation from its preactivation state.

The sealing tape according to the invention can be produced by applying the coating material to a compressed surface thereof in the compressed state of the sealing tape.

It will be understood that the sealing band is each adapted or adjusted to meet the characteristics described in the invention, or is handled in the sealing of the joint to fulfill these characteristics.

Fig. 1-4:

Dichtband mit thermisch aktivierbarem Beschichtungsmittel (Fig. 1), mit thermisch aktivierbarem Beschichtungsmittel in einer schmalseitenflächennahen Zone (Fig. 2), chemisch aktivierbarem Beschichtungsmittel (Fig. 3) und strahlungsinduziert aktivierbarem Beschichtungsmittel (Fig. 4), jeweils im Voraktivierungszustand und im Abdichtungszustand,

Fig. 5:

die Anordnung eines erfindungsgemäßen Dichtbandes in einer Bauteilfuge vor Rückstellung (Fig. 5A) und nach Rückstellung und Abdichtung (Fig. 5B).

The invention is explained below by way of example and described with reference to the figures. Show it:

Fig. 1-4:

Sealing tape with thermally activatable coating agent ( Fig. 1 ), with thermally activatable coating agent in a region close to the narrow side ( Fig. 2 ), chemically activatable coating agent ( Fig. 3 ) and radiation-induced activatable coating agent ( Fig. 4 ), in each case in the pre-activation state and in the sealing state,

Fig. 5:

the arrangement of a sealing tape according to the invention in a component joint before resetting ( Fig. 5A ) and after resetting and sealing ( Fig. 5B ).

Fig. 1 shows a joint sealing strip 1 according to the invention of a first embodiment for sealing a building joint 100 between a first component 101 and a second component 102 (s. Fig. 5 ). The first component 101 may according to Fig. 5 represent a frame profile as a window or door frame, the second component 102 is a wall portion. Optionally, the first component 101 may be a wall portion. The sealing tape 1 (in the Figures 1-4 shown in cross-section) has two opposite broad sides 2, 3 for sealing contact with the two components 101, 102, and the broad sides connecting narrow sides 4, 5, of which a room inside and the other, here the narrow side 5, can be arranged on the room outside or in the installation situation is arranged in the joint. At least one of the narrow sides 4, 5 is provided with a coating material 10, according to the embodiment as generally preferred within the scope of the invention, the space inside narrow side 5. Optionally, both narrow sides 4, 5 may be provided with a coating material. The coating material 10 is particulate applied to the surface of the narrow side 5 and arranged here evenly distributed over the narrow side 5. The particles are in close proximity to each other, based on the confectioning compressed compressed sealing tape (eg pre-assembled as a roll), where appropriate, material-free areas can be provided between the particles of coating material.

The particles form a monolayer (single layer) according to the embodiment. The material 10 covers here the entire narrow side 5, preferably in a uniform layer thickness. Due to the thermal activation, the coating material is at the same time smoothened over the narrow side, namely by at least partial or complete melting, whereby the particles together or adhere, flow into one another or fuse together, and thereby reduce the air permeability of the narrow side as a whole Increase WDD resistance, especially after cooling the material to room temperature. After transfer of the coating material in the sealing state, as described below, the two narrow sides 4, 5 may be provided with different thicknesses of the coating material to each other, which may be the same or different coating materials.

According to the invention, the coating material 10 is a coating material which can be activated as required, which can be converted from a preactivation state to a sealing state as required in order to form a narrow-side coating with increased airtightness and / or increased WDD resistance in relation to the state before activation. "If necessary" means that the coating material in the preactivation state with conventional storage of the sealing tape, for example, when stored at 20 ° C and 50% relative humidity over a period of one or several weeks or months (for example, up to a year or more) not or not significantly changed, and activation can occur at any desired time. "Not significant" means ≤ 5-10% or ≤ 1-3% based on air permeability and / or WDD resistance under the same conditions. The coating material may have a content of mineral fillers of 20 wt .-%.

The coated on the side surface 5 coating material is present in a particulate state, so that upon recovery of the sealing strip, the individual particles can move against each other. The particles have according to the embodiment, a mean diameter of 500-800 microns.

According to the embodiment according to Fig. 1 is the coating material 10 thermally activated, in particular by at least partial melting, in particular a wax, in particular a hard wax or polymer wax. The coating material according to the embodiment has a melting point in the range of 70-80 ° C. The coating material is thermally activatable in that it is heated above its softening point or melting point, for example by means of an external heat source such as a hair dryer, hot air blower or the like.

The joint sealing tape 1 further comprises according to the embodiment, a body 1a, so the joint sealing tape on any accessories such as additional strips or the like ausbildenden body, which consists of a foam material, in particular a soft foam, according to the embodiment, a flexible polyurethane foam. The soft foam can be closed-celled, according to the exemplary embodiment it is open-celled so that it has a significant air permeability, for example of ≥ 2-5 1 / m ² s, in particular of 100 1 / m ² s, with a thickness of the respective test specimen of 10 mm and a measuring negative pressure of 0.5 mbar in the otherwise usual according to the invention conditions. The foam is homogeneously impregnated for delayed recovery and impregnated for delayed recovery over part or the entire cross section of the sealing strip. According to the exemplary embodiment, the sealing tape in the pre-activation state has an air permeability of 35 l / m ² s based on the conditions mentioned. The coating material 10 is here applied superficially on the side surface 5, to which the side surface 5 with an adhesive 11, for example an adhesive or the like, wherein the coating material for adhesion to the side surface with the adhesive, for example, a low-temperature fusible polymer such as an acrylate, is brought into contact. For this purpose, the coating material provided with the adhesive side surface is applied, wherein the sealing strip is compressed, for example by placing the prefabricated preferably as a roll sealing tape, a quantity of coating material, or for example by sprinkling, then the coating material can be pressed against the side surface to the adhesive to connect, for example by means of a pressure roller or the like.

The sealing tape is in Fig. 1a represented as it is completely restored in the joint.

The thus obtained joint sealing tape with coating agent in the pre-activation state can be activated as required by heating the coating agent to temperatures above its melting point. The coating agent then deliquesces and forms on the side surface 5 a continuous film (s. Fig. 1B ), which after cooling, the coating material 10a in the sealing state. The activation takes place when the sealing tape 1 in the joint is completely returned, that is, completely fills the joint. Alternatively, the activation can take place when the sealing strip introduced in the joint has only partially or not yet returned, ie is still in its compression state, for example in the state in which the compressed sealing strip is cut to length from a roll, if it operates sufficiently quickly and the provision is made sufficiently quickly. According to a further alternative, the activation of the coating agent can take place before the joint sealing tape 1 is introduced into the respective building joint, for example shortly before a frame to which said sealing tape is fastened is inserted into a masonry opening. This is the case when the introduction of the sealing tape in the joint is faster than the transfer of the sealing tape from its pre-activation state in the sealing state.

According to an alternative variant of the method, the sealing tape provided with the coating material is heated to a softening temperature of the coating agent. The coating material thus does not dissolve independently, as is the case when heated to temperatures above its melting temperature. The coating material is activated, i. thermally heated to the softening temperature when the sealing tape is not yet in its fully retracted state within the joint. With provision and thus expansion of the sealing tape thus also adhering to the side surface of the tape softened coating material is extended so that this occupies an increasingly larger area (absolute value of the surface) with provision of the sealing tape, as in the pre-activation state at not yet at least partially decompressed tape.

According to a further embodiment of the joint seal by means of a sealing tape according to the invention, the coating material heated above its softening point can also be distributed over the side surface of the band by means of a tool such as a spatula, preferably if the sealing band is in the fully retracted state within the joint or at least in the almost retracted position Condition in which the joint is filled over ≥ 50-75% or ≥ 80-90% of the sealing band, which may apply to all embodiments within the scope of the invention.

The fully restored sealing tape with coating agent 10a in the sealing state, which in this case forms a film 12, is Fig. 1B shown. The coating agent or the film is here essentially only superficially on the Side surface of the tape arranged without appreciably penetrate into the tape, for example, less than 1 mm or less than 50 p or less than 10 p.

The thickness of the coating agent film in the sealing state ( Fig. 1B ), So even with completely relaxed sealing tape in the joint, according to the embodiment is about 50 microns.

According to a modification of the embodiment according to Fig. 1 For example, the areas of the coating material 10 are raised areas which may, for example, have a width of 0.5-1 cm or even beyond, and which are likewise shown here as spheres (but as hemispheres with adhesive on the sealing tape side surface Ball sectional area, block or plate-shaped or may be formed in another form). The applied coating material areas 10 are as in FIG Fig. 1 preferably substantially isometric, eg with a round, rectangular or polygonal contact surface on the side surface 5 of the sealing strip 1. The coating material regions 10 may have a thickness (elevation from the side surface) of ≥ 0.5-1 mm or ≥ 1.5 mm, preferably from ≦ 3-5 mm or ≦ 1.75 to 2 mm, which in each case can apply within the scope of the invention, irrespective of their form of the coating material regions. The individual surface areas are here also separated from each other or at least connected by weakening zones, which only slightly hinder an expansion of an expansion of the sealing strip and can act as predetermined breaking points in the rising of the band. The coating material is also applied here to the compressed sealing strip (as generally in the context of the invention on the compressed side surface), or by application as a melt, for example in the manner of a screen printing process. After introducing the sealing tape into the joint can - preferably after at least partial or complete recovery - the coating material can be thermally activated by melting or softening. By thermal activation, optionally in conjunction with expansion of the belt, flatten the raised areas and are converted to the sealing state by cooling. The size or amount of material of the individual surface areas can in this case exceed that of the individual coating material particles according to the previous variant. The coating material itself is also here - like Fig. 1 represented unevenly over the side surface 5 of the sealing strip 1, namely with areas of lesser layer thickness or free areas between the material regions 10, wherein the material regions 10, so the coated areas of the side surface, evenly - are arranged distributed on the side surface - ie in a regular grid arrangement ,

Fig. 2 shows an alternative embodiment in which the comments on Fig. 1 apply to the full extent, unless otherwise stated below.

The sealing tape 1 is also here over the cross section and length of homogeneous and continuously impregnated for delayed recovery and here has an air permeability of about 150 1 / m ² s. The coating material 10 is here on the one hand superimposed on the narrow side (11 a), on the other hand partially penetrated into the sealing strip (11 b). The coating material is here arranged in a zone 16 in the sealing strip, preferably uniformly distributed within the zone. This zone has here 1/8 of the width of the band (distance side surfaces 4, 5). This ensures that during a thermal activation of the coating tape, for example by means of a Heißluftföhns, the coating material of the entire zone is activated, that is melted and thus transferred to the sealing state, so that a defined profile of the activated coating agent and thus also defined profile of the air-tightness and / or the WDD resistance is given. Optionally, the sealing tape but also homogeneous over its entire cross section and length be impregnated with the coating agent 10.

Fig. 2B shows the sealing tape with coating agent 10a in the sealing state, wherein after melting of the coating agent this forms a film on the cell walls within the pores of the foam material. In this case, the molten, film-forming coating agent 10a preferably wets the cell walls to form the sealing zone 16a (from the zone 16 in the pre-activated state) and at least partially closes off the pores. At the same time hereby a continuous coating film is formed on the outer side of the sealing strip on the narrow side 5, wherein - not preferred - such an outer-side film 19 for special applications need not necessarily be present, for example, only the zone 16 is provided with coating material (including the coating material only in the zone 16 is applied or removed again from the narrow side, which can generally be considered within the scope of the invention). The coating material in the pre-activation state is also here particulate, wherein the individual particles are still customizable, which are preferably spaced apart from each other but are still mutually displaceable in any contact, so are independently positionally variable. As a result, the particles of the coating material do not or only insignificantly affect the recovery properties of the sealing tape and furthermore the air resistance and / or WDD resistance significantly less than the coating material in the sealing state, which at least partially seals the pores of the foam material. Preferably, however, the particles extend only over a depth of up to a pore diameter in the sealing tape.

The sealing tapes after the Figures 1 and 2 may optionally also have higher air permeabilities, for example in the range of 500-1000 1 / m ² s, without being limited thereto.

Fig. 3 shows a sealing tape according to an alternative embodiment in terms of the Figures 1 and 2 , The comments on these figures also apply here, unless otherwise stated in the following.

The sealing tape 1 is here provided with a chemically reactive coating material 30 on the surface of the side surface 5, wherein the coating material 30, the sealing tape partially or completely, preferably homogeneously enforce, especially in a narrow, adjacent to the side surface 5 zone, as in the embodiment too Fig. 2 executed. The reactive coating material is acted upon by a chemical reactant supplied from outside the sealing strip, here with water which originates from the atmospheric moisture or is additionally applied thereto. To initiate or accelerate the chemical reaction, the temperature of the coating material or the sealing tape can be increased.

The coating material 30 here is a polyurethane system which has hydrolyzable functional groups which, after the hydrolysis, can react with one another or with other reactive groups of the PU system, in particular under condensation and / or crosslinking. In particular, a siloxane-terminated polyurethane (SPUR) is present here. By moisture absorption, for example from the air or after moisture application, for example by spraying with water, a hydrolytic decomposition of the siloxane groups, whereupon they then react with other siloxane groups or other reactive groups of the polymer system under transfer of the coating material in its sealing state , It is understood that, as a modification of this exemplary embodiment, all other chemically reactive coating materials described according to the invention can be used, where the rectanand is preferably water, preferably water fed externally from the sealing tape, for example in the form of atmospheric moisture. However, SPUR systems have proven to be preferred in many cases.

In the sealing state, the coating material 10a then has a significantly lower air permeability and / or a higher WDD resistance than the coating material 10 before its activation. Again, as to the embodiment according to Fig. 1 carried out, the activation takes place at different times, preferably in fully restored within the joint sealing tape, possibly even when only partially reset sealing tape or before the introduction of the sealing tape in the joint, depending on the speed of the respective steps. The coating material is also applied here preferably only superficially on the side wall 5 of the sealing strip, if appropriate, this may also be partially embedded in the sealing strip, preferably only in a zone of small layer thickness.

After activation of the coating agent, a coating film is superficially formed on the side surface 5, preferably a continuous film, optionally a film with coating-free areas, which reduces the air permeability of the sealing tape and increases the WDD resistance. The thickness of the coating agent film in the sealing state ( Fig. 3B ), So even with completely relaxed sealing tape in the joint, according to the embodiment is about 50 microns.

Fig. 4 shows a sealing tape with coating agent according to the FIGS. 1 and 3 The above is referred to. In contrast to Fig. 3 Here, a radiation-induced crosslinking coating agent 40 is applied, for example, such with vinyl groups, CC double or CC triple bonds or the like, for example, an SBR rubber or (meth) acrylate, optionally in the form of a butadiene copolymer. The radiation activation can take place here by UV light, for example by means of a UV lamp. Due to the radiation activation, the coating agent cross-links so that its air permeability greatly reduced and the WDD resistance is greatly increased. The non-activated coating agent may in particular be applied in the form of a continuous film on the side surface 5 of the sealing tape. The coating material is here applied only superficially on the narrow side 5, so that a continuous film is formed on the side surface 5 by the coating material 40a in the sealing state.

The coating material film of the embodiments according to the Figures 3 and 4 has a tensile strength in the range of 20-40 N and a breaking elongation of 50-80% in the sealing state, under the usual conditions within the scope of the invention.

Fig. 5 shows the arrangement of a sealing strip 1 according to the invention, for example according to the embodiments 1 to 4, in a building joint 100, which is formed by the two components 101, 102. The component 101 in this exemplary embodiment is a window frame, the component 102 is a masonry area which provides a window reveal 103. With Fig. 5A the sealing tape is shown with applied coating material 10 in the preactivated state, wherein the sealing tape is completely returned in the joint, so completely fills the joint. The coating agent can be activated in this state, for example, by heat input, radiation, in particular UV radiation, or chemically, for example by moisture application, and a material according to the embodiments of the Figures 1-4 be. Fig. 5B shows the arrangement according to Fig. 5A with the coating material 50b in the sealing state, in detail this is on the embodiments of the FIGS. 1 to 4 Referenced.

For all embodiments, the inventive method for sealing the joint by means of the sealing tape according to the invention is carried out according to a variant such that the sealing tape in the pre-activation state to the first or second Applied component or attached to this, in particular pre-assembled, is, for example, on a frame profile such as a window or door frame. The sealing strip is then positioned together with the associated component or frame to form the joint on the other component, for example by the frame profile is inserted into a masonry opening. The coating material is activated according to a first variant of the method before positioning the sealing strip in the joint between the first and second component. According to a second variant of the method, the coating material is activated after the positioning of the sealing strip in the joint between the first and second component (or between frame and masonry reveal). The activation takes place after a partial or preferably complete recovery of the sealing tape in the joint.

In all embodiments, according to a variant, the sealing tape introduced into the joint is not surrounded by a film before activation, although an adhesive layer on the outside of the tape, by means of which the sealing tape is preassembled on the frame, is covered with a covering layer.

For all embodiments, according to a modification, the sealing strip introduced into the joint before activation has a content at 40 ° C volatile components, including water of ≤ 5 wt. Based on the weight of the tape.

For all embodiments, according to a modification, the sealing strip introduced into the joint before activation after a first modification, an air permeability in the range of 5-100 1 / m ² s or after another modification in the range of 50-200 1 / m ² s or after further modification in the range of 150-500 l / m ² s or beyond.

For all embodiments, the coating material is applied to the partially compressed sealing tape, which in particular to 15-30% of its volume in the complete deferred state is precompressed. The tape is pre-assembled as a roll.

In the Figures 1-5 the sealing tape is shown in each case at the same height, for example in a certain fugue completely filling reset state. It is understood that the stored compressed (prefabricated) sealing tape has a lower height prior to its recovery.

Claims (16)

Joint sealing tape for sealing a building joint between a first component and a second component such as a frame profile and a wall portion, wherein the sealing tape has two opposite broad sides for sealing contact with the two components, and two narrow sides connecting them, one of which is a room inside and the other space outside can be arranged, wherein at least the area of one of the narrow sides is provided with a coating material, and wherein the joint sealing tape is preferably formed delayed delayed resilient, characterized in that the coating material is an activatable on demand coating material, which starting from a Voraktivierungszustand by the activation in a Seal state is convertible, and forms in this a narrow side coating with increased airtightness and / or increased water vapor transmission resistance to the pre-activation state. Sealing strip according to claim 1, characterized in that the coating material is thermally and / or chemically reactive and / or radiation-activated or individually or in combination contains such. Sealing strip according to claim 1 or 2, characterized in that the coating material is distributed unevenly in the pre-activation state or arranged with regions of different layer thickness on the narrow side and in the sealing state has a relation to the Voraktivierungszustand more uniform distribution or layer thickness over the respective side surface. Sealing strip according to one of claims 1 to 3, characterized in that the activatable coating material in the preactivation state is particulate in the region of the side surface of the strip. Sealing strip according to one of claims 1 to 4, characterized in that the activatable coating material is a wax or contains such. Sealing strip according to one of claims 1 to 5, characterized in that the activatable coating material has a melting range between 40 ° C - 150 ° C. Sealing strip according to one of claims 1 to 6, characterized in that the activatable coating material is a by radiation, in particular UV radiation, curable or crosslinkable plastic material or contains such. Sealing strip according to one of claims 1 to 7, characterized in that the activatable coating material is a polyurethane and / or acrylate groups and / or polyether groups contained plastic material or contains. Sealing strip according to one of claims 1 to 8, characterized in that the activatable coating material contains a photoinitiator or a thermally activatable catalyst. Sealing strip according to one of claims 1 to 9, characterized in that the foam body of the sealing strip contains fillers, in particular mineral fillers, in a content of 5-95 wt .-% based on the total weight of coating and impregnating the foam body. Sealing strip according to one of claims 1 to 10, characterized in that the activatable coating material having a basis weight of 10 to 5,000 g / m ² on the side surface of the strip (based on the fully expanded state thereof) is applied. Sealing tape according to one of claims 1 to 11, characterized in that the coating material by the activation in the sealing state compared with the pre-activation state has a more than 1.1 times lower air permeability and / or more than 1.1 times higher water vapor diffusion resistance. Sealing strip according to one of claims 1 to 12, characterized in that the sealing tape with coating in the sealing state has airtightness of 1.1 to 100,000 times the airtightness in the preactivation state, determined according to DIN EN 1026. Building with a first and a second component, between which a joint is arranged, characterized in that in the joint, a sealing strip according to one of claims 1 to 13 is arranged, wherein the sealing strip is in the pre-activation state. Building with a first and a second component and an interposed joint, characterized in that in the joint, a sealing strip according to one of claims 1 to 13 is in the sealing state. A method for sealing a building gap between a first and a second component, in particular between a frame profile and a masonry, characterized in that in the building joint, a sealing tape according to any one of claims 1 to 13 is introduced and that arranged in the joint sealing tape by activation its pre-activation state is transferred to its sealing state.

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