Patent Application
20070248816
The adhesive strip according to the invention for the bonding of sheeting in the area of a building envelope, especially in the outer area in house construction, has a carrier material and an adhesive coating on this carrier material.
Generally, the adhesive strip according to the invention can be vapor permeable with a diffusion resistance with an sd value of ≦12 m, measured according to Deutsches Institut fur Normung (“DIN”) Standard 52615. The specified sd value relates to the value for the entire adhesive strip composed of the carrier material and adhesive coating. In addition, the carrier material of the adhesive strip can generally elongate elastically with a difference value between percentage of total elongation under loading εg and the percentage of permanent elongation after loading εb in the range from about 6 to about 80. The corresponding percentage values differ by about 6 to about 80 percentage points in the corresponding difference formation. For example, if a difference from 70% to 10% is formed, then the parameter value according to the invention equals the difference 70%−10%=60 or 60 percentage points. This elastic elongation parameter is referred to herein as “the difference value.”
The adhesive strip according to the invention can thus be, first, very vapor permeable and here sufficiently stretchable and stable, which is expressed through the newly discovered parameter according to the invention for the difference value between the percentage of total elongation under loading and the percentage of permanent elongation after loading of a carrier material used for the adhesive strip according to the invention. On one hand, as stated, the mechanical stability can be guaranteed, i.e., the permanent elongation after loading is never less than 6 percentage points and never greater than 80 percentage points different in relation to the percentage of total elongation under loading.
In some embodiments of the invention, the carrier material of the adhesive strip can have a difference value in the range of from about 7 to about 70. In some embodiments of the invention, the carrier material of the adhesive strip can have a difference value in the range of from about 8 to about 65. In some embodiments of the invention, the carrier material of the adhesive strip can have a difference value in the range of from about 12 to about 60.
For determining the elastic elongation properties according to the invention, determination according to DIN standard 53360 is used, wherein a change in length of a 25-mm wide test strip under a static load of 1 kg for 30 min and a change in length after unloading the test strip are determined. For these two values, as performed for the first time according to the invention, a difference from the total elongation and the permanent elongation can be calculated as a parameter, which, as was found according to the invention, can be a good measure for the elastic properties of such a test strip.
Three test bodies of 25-mm width and at least 250-mm length are removed from the carrier material sample longitudinal to the production direction. A measurement length of 100±0.5 mm is drawn on the sample bodies with two thin marks. The drawn measurement marks should be on the sample bodies with the same distance to the sample body ends. The profile of the longitudinal axis is to be drawn at the marks.
The total elongation εg of a sample is the ratio of the total change in length ΔLg to the original measurement length of the sample body L0. Here, the total change in length ΔLg is the difference between the measurement length at constant tensile loading after a certain loading period and the original measurement length of the sample body L0.
The permanent elongation εb is the ratio of the permanent change in length ΔLb to the original measurement length of the sample body L0. Here, the permanent change in length ΔLb after unloading is the difference between the measurement length, after the unloading of the sample body, i.e., after removing the tensile loading after a fixed period and the original measurement length of the sample body L0.
The tests are performed with conditions of 23±2 degrees Celsius and a relative air humidity of 50%. The samples are to be acclimated in the same climate for 24 h before the measurements. The 25-mm wide sample strips are mounted on an upper clamping cheek, and the lower end is loaded with a clamp and a weight of 1 kg. After 30 min the distance between the measurement marks, under tensile loading, is read. After unloading, i.e., removing the 1-kg weight, after another 30 min the elongation is measured. The total elongation and the permanent elongation in % can be calculated from these values.
Then the difference between the total elongation (static elongation) and the permanent elongation are determined.
ΔεR,εb=εR−Εb (3)
Table 1 shows measurement values of the elongations named above. The resulting elongations with loading and the permanent elongation in percentage are reproduced in the corresponding columns. The last column gives the difference between the elongation with loading and the permanent elongation from Equation (3).
The elastic carrier material samples according to the invention are distinguished in that high values, which are not less than 6, result from the difference between the elongation with loading and permanent elongation. In contrast, conventional carrier materials, such as polyamide or polystyrene, exhibit small values. Thin PE sheeting can be distinguished in that it tears under loading starting at 1 kg or elongates very far and does not retract again. Therefore, for typical polyethylene sheeting, the difference between elongation with loading and permanent elongation remains small.
The carrier material of the adhesive strip according to the invention can be a closed material according to a pinhole test. In some embodiments according to the invention, the carrier material has no perforations, not even through a part of the thickness of the material.
The pinhole test takes place in the following way:
The carrier material according to the invention is coated with a special pinhole-test solution composed of 500 parts turpentine oil, 500 parts petroleum, and 0.5 parts of the dye “Sudan red.” With this pinhole-test solution, very small micro-perforations in the sheeting materials can also be detected. For the test of water tightness or for testing whether the carrier material according to the invention preferably involves a closed material, the material to be tested is spread on a white, absorbent material. Then the carrier material is wetted with the pinhole-test solution. The pinhole-test solution is then coated onto the carrier material with a brush. After 5 min, the carrier material is removed and the white, absorbent material underneath is analyzed optically. A red coloring, which can also appear only in some positions, signals that the carrier material involves a material that is not closed, i.e., that has, e.g., micro-perforations, wherein such a carrier material is not water tight. Closed carrier materials in the sense of the preferred embodiment of the invention are distinguished in that during the pinhole test, the absorbent, white material has no red coloring after the test.
In some embodiments according to the invention, the carrier material of the adhesive strip can be water tight for rainwater.
In some embodiments according to the invention, the diffusion resistance of the adhesive strip lies at an sd value ≦10 m, measured according to DIN 52615. In some embodiments, the diffusion resistance of the adhesive strip lies at an sd value ≦8 m, measured according to DIN 52615. In some embodiments, the diffusion resistance of the adhesive strip lies at an sd value ≦5 m, measured according to DIN 52615.
In some embodiments the carrier material of the adhesive strip can be a plastic sheeting with at least one layer. In some embodiments, the carrier material can be a plastic sheeting comprising more than one layer. In some embodiments, the carrier material can be a plastic sheeting comprising 3 layers.
In some embodiments according to the invention, the carrier material can be a plastic sheeting composed of a layer, wherein the layer can be composed at least from ethylene-vinyl acetate (EVA) and a thermoplastic-elastomeric ether-ester block copolymer (TPE-E). In some embodiments, the carrier material further comprises one or more additives chosen from fillers, auxiliary products, sliding agents, anti-blocking agents, and dyes.
In some embodiments according to the invention the carrier material can be a multi-layer plastic sheeting, each layer composed of at least EVA and TPE-E. In some embodiments, the carrier material further comprises one or more additives, and the one or more additives is/are added to only one of the layers. In some embodiments, the TPE-E portion in the one or more layers can equal at least 10 wt %. In some embodiments, the TPE-E portion in the one or more layers can equal at least 25 wt %. The plastic sheeting according to the invention can offer a high and simultaneously precisely adjustable water vapor permeability and mechanical properties that are easily adjustable according to the invention.
The adhesive coating of the adhesive strip according to some embodiments of the invention is chosen from bonding agents, fusing adhesives, dispersion adhesives, solvent adhesives, acrylate adhesives, silicone adhesives, and rubber adhesives. It should be noted that the adhesive coating can be selected such that in interaction with the mechanical properties of the carrier material according to the invention, a correspondingly reliable and permanently acting adhesive strip is provided according to the invention.
In some embodiments, the adhesive strip according to the invention has a thickness of the carrier material ranging from about 40 to about 200 μm. In some embodiments, the thickness ranges from 45 to about 120 μm. In some embodiments, the thickness ranges from about 50 to about 100 μm. In some embodiments, the thickness ranges from about 55 to about 90 μm.
In some embodiments, the adhesive strip according to the invention can have a width in the range of from about 30 to about 1000 mm. In some embodiments, the width ranges from about 35 to about 600 mm. In some embodiments, the width ranges from about 40 to about 400 mm. In some embodiments, the width ranges from about 50 to about 150 mm. Thus, optimum processability can be given under all conditions.
For further mechanical reinforcement, the adhesive strip according to the invention can have a thread material, which in some embodiments can be embedded in the adhesive coating or can be arranged on the side of the carrier material, on which the adhesive coating is also located.
The adhesive strip of the invention, for example in accordance with the previously described embodiments, can be used for the bonding of sheeting in house construction in the outer area, such as in the area of roofs and facades.
Certain embodiments of the invention are illustrated in the following examples. While multiple embodiments of the invention are disclosed herein, still other embodiments may become apparent to those skilled in the art from a review of this specification. As should be realized from a review of the specification, the invention is capable of modifications in various aspects, all without departing from the spirit and scope of the present invention. Accordingly, the drawings and description, including the examples, are to be regarded as illustrative in nature and not in a limiting sense.
The invention is explained in more detail below with reference to example embodiments in connection with the enclosed figures.
In a cut-away side view,
The adhesive strip according to the invention, which is shown in
| Number | Date | Country | Kind |
|---|---|---|---|
| DE102006018123.9 | Apr 2006 | DE | national |
