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    • 专利摘要:
    In a wet adaptive vapor barrier, particularly for use in thermal insulation of buildings, the vapor barrier is formed of a material which, at a humidity of 45 to 58%, is substantially plateau-like within a range of sd values of 2 to 5 m diffusion-equivalent air layer thickness.
    公开号:AT13585U1
    申请号:TGM61/2013U
    申请日:2010-12-10
    公开日:2014-04-15
    发明作者:Rainer Dorn；Birgit Boge；Franz-Josef Kasper
    申请人:Saint Gobain Isover；
    IPC主号:
    专利说明:

    Austrian Patent Office AT13 585U1 2014-04-15
    Description: [0001] The invention relates to a moisture-adaptive vapor barrier according to the preamble of claim 1 and to a production method for such a vapor barrier.
    Moisture-adaptive vapor barriers are characterized in that the water vapor diffusion resistance of the vapor barrier changes depending on the moisture in such a way that the water vapor diffusion resistance decreases with increase of the humidity surrounding the vapor barrier. The water vapor diffusion resistance is usually measured according to DIN EN ISO 12572: 2001.
    Such vapor barriers are used primarily for use in the manufacture of the airtightness of buildings and that significantly in connection with thermal insulation systems for buildings. For the thermal insulation of buildings, in particular roofs diffusion-open underlays are usually below the roof formed approximately by bricks, including a thermal barrier coating, such as mineral wool, finally a vapor barrier and including a cladding used. The use of a vapor barrier primarily pursues two intentions. On the one hand, the airtightness of the roof is to be ensured in order to prevent the ingress of cold outside air into the building interior and the escape of warm indoor air from the building, whereby thermal energy losses as well as building damaging, convective moisture inputs are avoidable. Second, the vapor barrier should have a certain barrier effect against water vapor diffusion in order to avoid unwanted moisture entry into the building structure.
    Through the use of so-called wet-wicking vapor barriers, which are usually present as a film, moisture penetration in the winter is prevented as a result of the moisture-adaptive characteristics of such a film by the steam brake largely closes under wintry and thus dry moisture conditions. If at higher heat radiation in the summer and thus under wetter conditions compared to winter conditions moisture from the timber construction, for example, a roof, reacts the vapor barrier film as a result of comparatively high humidity surrounding the vapor barrier in which it opens as it were due to reduction of the water vapor diffusion resistance, so that a corresponding dehydration is guaranteed.
    As a material for moisture-adaptive vapor barrier films polyamide is often used (see DE 195 14 420 C1). In this film, the water vapor diffusion resistance decreases with increasing mean ambient humidity. Here, the moisture-adaptive properties of this known film-like vapor barrier are set so that they at a mean humidity of the atmosphere surrounding the vapor barrier of 30 to 50%, a water vapor diffusion resistance (sd value) of 2-5m diffusion-equivalent air layer thickness and at a humidity of the environment Range of 60-80% has a water vapor diffusion resistance (sd value) which is less than 1m. This has the consequence that such a vapor barrier at winter time, in which there are usually dry conditions and the relative humidity of the atmosphere surrounding the vapor brake is substantially in the range of 30 to 50%, the vapor barrier acts so far as braking as a result of comparatively high water vapor diffusion resistance closes the vapor barrier, so only a little water vapor can diffuse through the film. This prevents any significant moisture from the interior of buildings passes through the film to the outside, for example in a wooden structure of a building roof and / or a wall, where the moisture is then reflected and can eventually lead to rot and mold.
    Under humid conditions, as you prevail, especially in summer months, however, due to the reduced diffusion resistance allows diffusing the moisture. This has the consequence that now moisture can be removed from the timber construction, so a drying out is made possible, so that damage can be avoided in particular to the wooden structure.
    Finally, more vapor barrier films in multi-layer structure with moisture-adaptive 1/11 Austrian Patent Office AT 13 585 Ul 2014-04-15
    Characteristic known (DE 20 2004 019 654 U1 and DE 101 11 319 A1), which at a relative ambient humidity of 30 to 50%, a water vapor diffusion resistance sd of 5m diffusion-equivalent air layer thickness and above and at a relative ambient humidity of 60 to 80% Have water vapor diffusion resistance sd of less than 0.5m diffusion-equivalent air layer thickness. In such known moisture-adaptive vapor barrier films, the water vapor diffusion resistance, plotted against the mean or relative humidity in the manner of an S-curve with incoming S-leg changes from higher water vapor diffusion resistance values at lower humidity in the direction of expiring S-legs with reduced diffusion resistance values higher, the moisture barrier surrounding the vapor barrier.
    As is known, the curve diffusion resistance over moisture of the moisture-adaptive vapor brakes can be set via the formula Sd = D × μ, wherein D indicates the thickness of the vapor barrier and μ represents a material-dependent parameter of the vapor barrier. Thus, although a change in the moisture-adaptive character of a vapor barrier over a corresponding thickness setting is possible, ie the thickness of the vapor barrier film is increased or decreased accordingly, but this does not change the S-curve, but only leads to a shift of the S-curve along the ordinate , This would increase the thickness of the vapor barrier to a corresponding increase in the Sd value both under dry conditions in winter and under humid conditions in summer, but in such a case for summer conditions to a deterioration of the properties of the vapor barrier due to the reduced dehydration behavior would result. However, a reduction in the thickness of the vapor barrier film, which is usually in thicknesses in the range of 20pm to 80pm, is limited for strength and stability reasons.
    Although the known vapor barrier films have proven suitable for normal conditions, these are in particular dry environmental conditions, as prevalent in offices in general, and under normal humidity conditions, as prevail especially in residential buildings, however, the behavior of the known vapor barrier films under increased moisture load especially under colder weather conditions quite problematic. An increased moisture load is especially in rooms, such as commercial kitchens, canteens and the like, but also in living and office space, in which a lot of plants and / or aquariums and the like are housed. An increased moisture load is especially in new buildings and in the renovation of old buildings due to mortar or screed. Due to modern building materials and new construction methods such construction measures are more and more carried out in the colder months, especially in the months of October to March, in times where the ambient humidity settles to a relatively dry value, in which the vapor barrier films among such close normal conditions. However, in the event of a damp load, in particular when carrying out construction work in the colder season, conventional vapor dampers may open the foil due to the ambient humidity on the vapor barrier foil and thus a largely unimpeded moisture entry through the vapor barrier foil into the wooden structure come, which to a certain extent is extremely critical and can lead to damage in the timber construction in consequence mold and the like.
    The object of the invention is to propose a vapor barrier and a manufacturing method for such a vapor barrier, which takes into account the previously described conditions, especially in the cold season, i. E. at high humidity load a critical discharge of moisture by the vapor barrier film substantially prevented.
    This object is achieved by the measures contained in the characterizing part of claim 1, wherein expedient developments of the invention are characterized by the features contained in the subclaims.
    In accordance with the invention, the vapor barrier, which is preferably in the form of a film, is characterized in that it is formed from a material which has a three-part moist surface, namely from a middle part relative humidity of 75%, preferably of 70% and above an sd value of less than 1 m, preferably less than 0.8 m diffusion-equivalent air layer thickness, then with decreasing average humidity in a range of 45 to 58%, preferably in a range of 40 to 58% has a substantially plateau-like or approximately plateau-like course of the sd value, wherein a lower sd value of 2 m and an upper sd value of 5 m is not exceeded over this range and the difference between the lower and the upper sd Value does not exceed 1 m in this range. With further decreasing moisture in a range of 20 to 30%, preferably 20 to 35%, the vapor barrier has a sd value which is at least 0.5 m above the upper actual sd value in the plateau-like middle region.
    Thus, the vapor barrier film from a building physics point of view imperative small barrier effect in the range of high average humidity greater than 75%, in particular 75%, i. E. a high dehydration behavior in summer. At the same time the vapor barrier film in particular meets the criterion that at high moisture loads in rooms, as they occur especially in commercial kitchens, canteens and the like or construction in cold seasons, although a certain discharge of moisture allows, but nevertheless the discharge of moisture conventional steam brakes are reduced accordingly, so that a critical entry of moisture in a wooden structure and the like is avoided in such situations. Under high moisture load therefore opens the vapor barrier film with increasing humidity in the specified range of 45 to 58% or 40 to 58%, but the change in the sd value in this humidity range is only to a lesser extent than in conventional vapor barrier films vonstatten, so that in a certain holding phase of the change in the sd values of the vapor barrier film occurs such that the sd values of the vapor barrier film in this area change only gradually, but otherwise in principle almost or substantially substantially constant ratios with respect to the sd value be guaranteed in this area. Preferably, the curve of the sd over moisture in the range of 45 to 58%, preferably 40 to 58%, has a substantially plateau-like course, i. the change in the sd value in this range is kept low over a longer period of time determined by the increased moisture load, so that on the one hand a certain desired blocking effect of the vapor barrier film is retained and nevertheless a certain diffusion of moisture is possible if the moisture content is excessively exceeded without However, a critical moisture discharge is achieved, as would be the case with conventional vapor barrier films at such moisture loads.
    The usual course of the sd values on the moisture values of conventional vapor barrier films is reflected in a substantially S-shaped curve, whereas in the vapor barrier film according to the invention preferably the curve in the form of a double-S curve is present, the outflowing region of S-curve in the dry area coincides with the incoming value of the S-curve for the wet area and in the range of a humidity of 45 to 58% or 40 to 58% of the curve almost constant or substantially plateau-like, ie only with a small change in sd values. In an expedient embodiment of the invention, the course of the curve within the essentially plateau-like range changes by an sd difference value corresponding to the difference of the sd value of the curve when entering the humidity of 45% compared to the sd value during extension of the curve a moisture content of 58% by a maximum of 0.6 m, preferably a maximum of 0.4 m diffusion-equivalent air layer thickness. That is, the vapor barrier film changes its sd value within this range only gradually, so that a corresponding holding phase is achieved in which the vapor barrier film still largely blocks, but allows a certain moisture discharge within the parameters already mentioned above. The plateau-like profile of the curve of the sd values above the moisture is preferably within a range of 3 to 5 m diffusion-equivalent air layer thickness.
    According to an expedient proviso of the invention, the wet-wicking the moisture-determining material in a single layer or layer, which is formed entirely of this material, in contrast to conventional vapor barrier films, at 3/11 Austrian Patent Office AT13 585U1 2014-04 15 moisture adequacy is determined by several layers of a vapor barrier film arranged one above the other.
    The plateau-like curve of the sd values or the holding phase described with only a slight change in the sd values in the humidity range of 45 to 58% or 40 to 58% is achieved by adding an additive to the base material of the vapor barrier, wherein the Admixture 10 to 20%, preferably 15 to 20%, (weight percent) compared to the remaining material of the vapor barrier film is. The base material of the vapor barrier film is preferably polyamide, wherein as a preferred additive modified polyolefins, in particular a grafted polyethylene copolymer is used. Such grafted polyethylene copolymers are offered by various manufacturers. The types marketed under the brand names Bynel® by Du Pont have proven particularly suitable. Another preferred additive is polyethylenepolyacrylic acid copolymers also offered by various manufacturers. The types marketed under the brand names Surlyn® by Du Pont have proved to be particularly suitable.
    The responsible for the moisture acceptability of the vapor barrier film is characterized by a homogeneous layer structure, which is largely due to a chemical mixing of a compound from the present in granular form polyamide and the also present in granular form additive by melting the granular mixture, from this Melt of polyamide and additive granules are formed from which then the vapor barrier film is extruded or produced by a blowing process. It is expedient here for the additive to be present in the form of nanoparticles within the starting granulate of the additive.
    In accordance with the invention, vapor barrier films can be produced with this described wet-tissue aptitude in a thickness range of, in particular, 40 to 80 .mu.m, preferably 50 to 70 .mu.m. In the context of the invention, it is the case that this single-layer vapor barrier film, as far as the moisture-adaptive character is concerned, is supplemented by further suitable layers, which are provided either to reinforce the film or to influence other properties of the vapor barrier film, depending on the application.
    A convenient method for producing such a vapor barrier film is characterized in that, starting from granules of polyamide and an additive present in granular form, in particular polyethylene, a compound is formed by mixing. This compound from granular raw materials is melted in a suitable mixing ratio in an extruder, optionally with the addition of other auxiliaries such as homogenizing agents, with the aim to create a homogeneous melt of the above-mentioned starting materials. From the homogeneous melt a mixed granulate is produced. This mixed granulate is further processed in an independent process step in an extrusion process or a blown process into a single-layer vapor barrier film or monofilm according to the invention. A vapor barrier film produced in this way is characterized by a substantially homogeneous structure. Alternatively, the starting materials can also be further processed directly in a suitable extruder and into a corresponding monofilm. The alternative method is preferred because of the unnecessary precompounding from an economic point of view, but the required homogenization of the melt is difficult to ensure in the production reality to the desired extent.
    The monofilm produced by this process can be provided in known laminating with other layers, in particular to improve their mechanical properties. These additional layers preferably have no effect on the inventive moisture-adaptive character of the film, which is determined by the monofilm.
    The mixing ratio of polyamide and additive is set with a view to the desired adaptive humidity characteristic. It has been found in practical experiments that, depending on the individual additive added to a polyamide base, an addition of the additive to polyamide base in the amount of 7 to 25% is advantageous both for the achievement of the desired adaptive moisture characteristic according to the invention as well as with respect to the manufacturability of the film. Particularly preferred is an admixture of the additive in the range of 10 to 20%, in particular 14 to 18%, with very good results were achieved with an admixture in the range of 15 to 18%. The upper limits of the admixture of the additive are due to the substance in the range of about 20 to 25% by weight, with a focus on the manufacturability of the film according to the invention a limit of 25% by weight should not be exceeded and the manufacturability of the film is the better, the more the upper range limit shifts downwards towards 20% and below.
    In the following, preferred embodiments of the invention will be explained with reference to the single figure, which is a graph of curves of four vapor barrier films according to the invention with respect to the sd values over the mean relative humidity, i. represents the ambient humidity around the vapor barrier film.
    The curves K1, K2, K3 and K4 show four vapor barrier films, each one-ply and polyamide here with the additive Bynel® 4157 with 20% by weight, and a thickness of 40 pm (K1: 40 pm/20%/B ), an aggregate content of 15% by weight Bynel at a layer thickness of 70 μm (K2: 70 μm / 15% / B), an aggregate content of 18% by weight Surlyn® 1605 at a layer thickness of 60 μm (K3: 60 μm / 18%). / S) or here with the additive EVOH Type H171B (manufacturer EVAL Europe) of 15% by weight with a layer thickness of 50 pm (K4: 50 pm / 15% / EVOH).
    In terms of ease of manufacture, the upper limits for Bynel 4157 were about 22% by weight, for Surlyn 1605 about 20% by weight and for EVOH Type H171B about 20% by weight.
    As can be seen, the humidity adaptivity of the vapor barrier is defined by three areas, each of which determines a rectangular frame. From a humidity of 75%, a rectangular area I with sd values of less than 1 m diffusion-equivalent air layer thickness is clamped. In the humidity range of 45 to 58%, sd values are given in the range from 2 to about 4.3 m diffusion-equivalent air layer thickness, resulting in a spanned rectangle for area II, within which a second rectangle is spanned, which is the difference of at most 1 m takes into account the diffusion-equivalent air layer thickness between the lower actual value and the upper actual value in region II. At dry, low humidity in a range of 20 to 30%, the sd values of the vapor barrier film are in a sd value range whose lower limit is at least 0.5 m above the upper actual value in the region II, whereby an upwardly hatched hatched rectangular area III spanned becomes.
    The moisture profile of the curve K is spanned by distributed over the abscissa measuring points, wherein the measurement is carried out according to DIN EN ISO 12572: 2001. It has been found in test series that a precise determination of a single measuring point in the area of the envelope, i. In a steeper curve in known wet-adaptive vapor brakes with a single S-curve curve at medium humidities of about 35 to 65%, only a slight gradient should be set between the adjacent to the two sides of the vapor barrier moisture, from which the mean humidity is determined by averaging. Too large gradients lead to falsifications of the measured values, which are reflected in too low sd values. As usual, a moisture is given by a salt or water, the other side by the setting of a controllable climate chamber.
    Table 1 summarizes the humidity settings and the measured values for the exemplary embodiments K1, K2, K3 and K4 according to the invention. 5/11 Austrian Patent Office AT13 585U1 2014-04-15
    Table 1: Humidity conditions for sd value measurement and sd values in m
    Salt Climate Average K1 K2 K3 K4 chamber value sd value [m] sd value [m] sd value [m] sd value [m] Silica gel: 2% 26% 14% - - - 9,75 Silica gel: 2 % 40% 21% - - - 8,94 Silica gel: 2% 53% 27,5% 3,77 6,20 5,96 7,16 Magnesium nitrate 6 hydrate: 53% 20% 36,5% 3,10 5.20 4.33 5.67 Magnesium Nitrate 6 Hydrate: 53% 40% 46.5% 2.36 3.58 3.54 3.85 Magnesium Nitrate 6 Hydrate: 53% 62% 57.5% 2 , 12 3.18 3.3 3.25 Sodium chloride: 75% 50% 62.5% 1.22 1.75 2.15 2.74 Water: 100% 50% 75% 0.33 0.47 0.4 1.84 Water: 100% 60% 80% 0.25 0.38 0.34 0.24 The course of the curves K1, K2, K3 and K4 can be described with a double-S profile, wherein the leaking leg of the curve in the dry moisture range within the range II merges into the incoming legs of the S curve for the moister section and evident within the range II only a gradual reduction of the sd values takes place, so that it approximates to a certain holding phase and therewith to a quasi-constant course m plateau-like character, and the sd values change only gradually within this humidity range, i. the tendency in the direction of opening the vapor barrier film in the area II is reduced accordingly. To confirm the double-S course, additional measurement points at low mean humidities of 14% and 21% were additionally determined for the exemplary embodiment K4.
    A double S-curve is mathematically described by the following equation: Al A2 y (x) x 1 + e
    Bl- (x-Cl) + - 1 + e B2- (x-C2)
    + D
    The parameters A1 / A2 stand for the spread of the two individual S-curves between minimum and maximum ordinate value, B1 / B2 indicate the spread of the envelope area, i. the steepness of the S-curve, C1 / C2 defines the position of the inflection point of the S-curves, D the lower limit value.
    Using the least-squares method for the regression, we obtain: s = Σ [γί (Χί) -y (Xi)] 2-> rnin z = 1
    dS n = 2 · Σ dAl ... D i = 1 dy _ 1 dAl 1 + e yU;)] · dy dy BUXi-Cl) and -dAl ... D 1 = 0, with dA 2 1 + e B2- (x1-C2) dy dBl (i + e -1_ bi - ^ - cdY2 dy dB2 -1 (l + <B2 (x, -C2) 1 (x; -C2) e 6/11 Austrian Patent Office AT13 585U1 2014 -04-15 dy _l
    dD
    Thus, 7 equations are used for the determination of the curve parameters A1 to D DZ i = 1 n 2) Σ i = 1 n 3) Σ i = 1 4) Σ i = 1 n5> Σ i = 16) Σ i = 1 yMd-yMi) - y * (* /) -
    A1 A2 + - "- + D 1. 51- (x-Cl) 1. ßZ &quot; vl + e '1 + e 52- (j, -C2)
    Al A2 + - + D l + eBHXi cl) 1 + e B2- (x, -C2) 1 + e 1 = 0
    Al A2 V1 + βΒΗχ, · -CD l + e B2- (xi-C2)
    + D
    Al · A2 + - ^ - T ^ - + D ^ l + eBHXl-ci) l + e B2- (Xj-C2) B2- (xi-C2) = 0 (ΛΤ, -Cl) = 0 1 + e
    Al A2 + ---- + D BHxt-Cl) ^ + eB2- (xi-C2)
    Al - + A2 V1 + βΒΗχ, · -cd l + e B2- (xi-C2)
    + D 1 (l + ^ -CDj -C2) -eB2 '
    Bl-em (x'-Ci) (Xi-C 2) = 0 = 0 (1 + eB2 <x.-C2) f B 2-e B2- (xl-C2) 0
    Al A2 n7) Σ i = 1 This system of equations can not be closed in a closed manner. It is usually calculated using an iterative method starting from suitable starting values. For the three curves K1, K2 and K3 the following values result as "best fit": 1 + e BHx.-Cl) + 1 + e B2- (xl-C2)
    + D = 0 A1 A2 B1 B2 C1 C2 D K1 3.5 2.0 0.20 0.48 25 62 0.29 K2 6.3 3.2 0.23 0.44 25 62 0.36 K3 2, 5 3.2 0.4 0.41 34 63 0.35 K4 6.7 3.3 0.15 0.5 30 62 0.2 iteration step 0.1 0.1 0.01 0.01 0.5 0 As the embodiments prove, the course of the curve K can of course be influenced by the layer thickness and a corresponding admixture of the additive, wherein, as already stated above, preferably Bynel®, for example Bynel® 4157, or Surlyn®, e.g. Surlyn® 1605, or EVOH, e.g. H171B is used.
    The vapor barrier films K1 and K2 were prepared from a granule mixture of polyamide with about 15% or 20% Bynel® 4157, wherein this granule mixture is melted and in turn a granulate of a mixture of polyamide and Bynel® 4157 is formed from the melt. From this granulate, a vapor barrier film having a thickness of 70 pm or 40 μm was then produced by conventional extrusion in an extruder. The vapor barrier film K3 was prepared in an analogous manner with the addition of 18% Surlyn® 1605. A product thickness of 60 μm was produced. The vapor barrier film K4 was produced over a slurry of polyamide with addition of 15% EVOH H171B in an extruder with attached slit nozzle. A product thickness of 50 gm was produced.
    In all embodiments, a polyamide 6 was used, namely the type B40L (manufacturer BASF).
    Practical experiments have shown that the vapor barrier films according to the invention, especially under damp conditions, as they are in construction projects under new buildings or renovations, in the critical humidity range of 45 to 60% still develops a desired barrier effect and only slightly in the specified range opens, so that over a longer period of time, a largely uniform and not harmful to the wood construction moisture discharge takes place through the vapor barrier film. 8/11
    权利要求:
    Claims (15)
    [1]
    Austrian Patent Office AT 13 585 Ul 2014-04-15 Claims 1. Moisture-adaptive vapor barrier, in particular for use for thermal insulation of buildings, which has a water vapor diffusion resistance (sd value) expressed as a diffusion-equivalent air layer thickness (sd value) with decreasing Moisture of the humidity surrounding the vapor barrier, characterized in that the curve of the sd values of the vapor barrier on the moisture substantially in the manner of a double-S curve, wherein the outgoing portion of the S-curve in the dry region with the incoming value of the S-curve for the wet area coincides.
    [2]
    2. vapor barrier according to claim 1, characterized in that substantially in the transition region of the successive S-curves is a plateau-like area.
    [3]
    3. vapor barrier according to claim 1 or 2, characterized in that the curve of the sd value on the humidity in the range of 45 to 58%, preferably from 40 to 58% has a substantially plateau-like course.
    [4]
    4. vapor barrier according to one of claims 1 to 3, characterized in that the vapor barrier in a range (I) from an average relative humidity of 75%, preferably of 70% and above a sd value less than 1 m, preferably less than 0, 8m, and at an average humidity in a range (II) of 45 to 58%, preferably in a range of 40 to 58% with the substantially plateau-like or approximately plateau-like course of the sd value over this range, a lower sd Value does not fall below 2 m and an upper sd value of 5 is not exceeded and the difference between the upper and the lower actual sd value does not exceed 1 m, and at an average humidity in a range (III) of 20 to 30%, preferably 20 to 35% has an sd value which is at least 0.5 m above the upper actual sd value in the plateau-like middle region.
    [5]
    5. vapor barrier according to claim 4, characterized in that the plateau-like course of the curve of the sd value above the humidity within a range (II) of 3 to 5 m diffusion-equivalent air layer thickness takes place.
    [6]
    6. vapor barrier according to claim 4 or 5, characterized in that the course of the curve within the substantially plateau-like region (II) by a sd-difference of a maximum of 0.6m, preferably a maximum of 0.4m diffusion-equivalent air layer thickness changes, in particular decreased with increasing humidity decreasing.
    [7]
    7. vapor barrier according to one of the preceding claims, characterized in that the sd values of the vapor barrier from a humidity of 75%, preferably a humidity from 70% and above less than 0.5m diffusion-equivalent air layer thickness.
    [8]
    8. A vapor barrier according to any one of the preceding claims, characterized in that the material determining the moisture adaptivity of the vapor barrier material in a. is present in a single layer.
    [9]
    9. vapor barrier according to claim 8, characterized in that the material of the vapor barrier is formed of polyamide with an admixed additive.
    [10]
    10. vapor barrier according to claim 9, characterized in that the proportion of the additive in the material of the layer 7 to 25%, preferably 10 to 20%, particularly preferably 14 to 18%, measured in weight percent.
    [11]
    A vapor barrier according to claim 9 or 10, characterized in that the additive is formed by a modified polyolefin, in particular by a grafted polyethylene polymer, preferably Bynel, or by a polyethylene-polyacrylic acid copolymer, preferably Surlyn (trade name of Dupont). 9/11 Austrian Patent Office AT13 585U1 2014-04-15
    [12]
    12. vapor barrier according to one of claims 8 to 11, characterized in that the material of the layer to form a substantially homogeneous layer structure of polyamide granules and the present in the form of granules additive is formed, which are extruded after mixing into a film-like layer.
    [13]
    13. vapor barrier according to one of claims 8 to 11, characterized in that the material of the layer to form a substantially homogeneous layer structure of polyamide granules and the present in the form of granules additive is formed, which after mixing to form a compound and melting the compound chemically mixed and formed into polyamide and the additive-containing granules and finally extruded or blown into a film-like layer.
    [14]
    14. vapor barrier according to claim 12 or 13, characterized in that the additive is present in the form of nanoparticles within the starting granules of the additive.
    [15]
    15. vapor barrier according to one of the preceding claims, characterized in that the material layer is formed by a film having a thickness of 40 to 80pm, preferably a thickness of 50 to 70pm. 1 sheet of drawings 10/11
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    法律状态:
    2021-02-15| MK07| Expiry|Effective date: 20201231 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102009057707|2009-12-10|
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