RU2640544C1 - Coating compositions for building materials and substrates of building materials with coating - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: coating composition adapted to selectively retain water vapour as a function of humidity when cured to form a barrier layer, comprises a hydrophobic component comprising a styrene-butadiene latex having a carboxylation of 0 to 20%; a hydrophilic component comprising a polymer selected from polyvinyl alcohol and sodium polyacrylate and a hydrophilic filler selected from kaolin clay; the coating composition after curing is effective to provide variable water vapour permeability of 1 perm or less at an average relative humidity of RH of 25% and about 15 Perm or more at an average relative humidity of 95% as measured by ASTM E96 at 21°C, and tested by applying and curing the composition on craft paper. The invention also relates to an article capable of selectively retaining water vapour, depending on humidity, comprising a substrate of a building material and a barrier layer applied to a substrate of a building material obtained by curing the above coating composition. The coated article is designed in such a way that it can exhibit a certain permeability profile such as, for example, a variable value of water vapour permeability of about 1 Perm or less at an average relative humidity of RH of 25% and about 15 Perm or more at an average relative humidity of 95 %, measured according to ASTM E96 at 21°C.

EFFECT: improvement of characteristics.

13 cl, 3 dwg, 2 tbl

Description

FIELD OF TECHNOLOGY

This application relates to coatings for building materials. More specifically, some of the embodiments described herein relate to coatings effective to provide a coated substrate having different values of water vapor permeability depending on relative humidity (RH).

BACKGROUND

Building materials may contain films or cladding materials attached to them to provide the required physical properties. The film or lining material typically contains petroleum products, which can lead to a significant release of volatile organic compounds (VOCs) upon receipt and / or use of the material.

Currently existing products cannot maintain the required water vapor permeability at low relative humidity. In addition, modern coating compositions cannot be used with porous substrates, such as porous non-woven materials. Therefore, innovative solutions are needed to provide new coating compositions that can be used on many different substrates, including, for example, porous substrates and, in particular, porous non-woven substrates, while ensuring the required water vapor permeability, in particular at low relative humidity .

BRIEF DESCRIPTION OF GRAPHIC MATERIALS

Some embodiments are described with reference to the accompanying figures, including:

In FIG. 1 shows a coated substrate in accordance with one implementation of the present description.

In FIG. 2 shows a coated substrate, wherein the coating penetrates to a certain depth into the substrate, in accordance with one embodiment of the present description.

In FIG. 3 is a graph of viscosity measurements of Example 3.

Those skilled in the art, upon reading the present description, will understand that some of the dimensions or details shown in the drawings may be enlarged, distorted or otherwise depicted in an unusual or disproportionate manner to provide a more visual version of the drawings. When specifying sizes or values below in the text, sizes and values are presented for illustrative purposes only. Mention of the front, back, top and bottom is for illustrative purposes and is not limiting.

DETAILED DESCRIPTION

In General, the present description relates to a coating composition for substrates of building materials and to substrates with a coating that can provide selective retention of water vapor depending on humidity during curing. These concepts will become better understood when reading the above description.

The coating composition may generally contain a hydrophobic component and a hydrophilic component.

In some embodiments, the hydrophobic component may comprise a water-insoluble polymer.

In specific embodiments, a water-insoluble polymer may be provided for the coating composition in the form of an aqueous dispersion, such that the water-insoluble polymer is dispersed in water.

In the most specific embodiments, the hydrophobic component may contain latex. For example, latex may contain styrene-butadiene, styrene-acrylic, acrylic, vinyl acetate-ethylene, vinylidene chloride, polyethylene, wax, polyvinyl chloride, polyvinyl butyral, polypropylene, butadiene latex, or combinations thereof. In even more specific embodiments, the hydrophobic component may comprise styrene-butadiene latex.

In some embodiments, the hydrophobic component may be described by% carboxylation thereof. % carboxylation refers to the weight percent of carboxylic acid monomer in the polymer skeleton. Accordingly, in specific embodiments, the hydrophobic component may have a% carboxylation equal to substantially 0%, at least about 0.1%, at least about 0.5%, or even at least about 1%. In further embodiments, the hydrophobic component may have a% carboxylation of not more than about 20%, not more than about 15%, not more than about 10%, not more than about 5%, or even not more than about 3%. In addition, the hydrophobic component may have% carboxylation in the range between any minimum and maximum values presented above, for example, in the range from 0% to 20%, from 0.1% to 15%, from 0.5% to 10%, or even from 1% to 8%. In the most specific embodiments, the hydrophobic component may have a% carboxylation of about 0%, in which case the hydrophobic component essentially does not contain a carboxylic acid monomer in the polymer backbone.

It has been shown that a particular advantage of the above% carboxylation is to achieve excellent permeability depending on relative humidity in combination with a hydrophilic component. Not limited to theory, it is believed that high values of carboxylation of latexes lead to a very high permeability of water vapor at an average relative humidity.

In some embodiments, the hydrophobic component can be described by its glass transition temperature (Tg). In this context, the glass transition temperature (Tg) of the hydrophobic component is measured in accordance with differential scanning calorimetry analysis or dynamic mechanical analysis. Accordingly, in some embodiments, the hydrophobic component may have a glass transition temperature (Tg) of at least about -50 ° C, at least about -40 ° C, or even at least about -30 ° C. In further embodiments, the hydrophobic component may have a glass transition temperature (Tg) of not more than about 35 ° C, not more than about 25 ° C, not more than about 25 ° C, or even not more than about 15 ° C. In addition, the hydrophobic component may have a glass transition temperature in the range between any minimum and maximum values presented above, for example, in the range from -30 to 25 ° C, from -30 to 15 ° C, or even from -30 to 0 ° C.

In some embodiments, the hydrophobic component may be present in the composition or in the barrier layer in an amount of at least about 15 mass. %, at least about 25 mass. %, at least about 35 mass. % or even at least about 45 mass. % in terms of the total dry weight of the hydrophobic and hydrophilic components of the barrier layer. In additional embodiments, the hydrophobic component may be present in the composition or in the barrier layer in an amount of not more than about 99 mass. %, not more than about 98 mass. % or even not more than about 97 mass. % in terms of the total dry weight of the hydrophobic and hydrophilic components of the barrier layer. In addition, the hydrophobic component may have a content in the composition or in the barrier layer in the range between any minimum and maximum values presented above, for example in the range of 15 mass. % to 99 mass. %, from 25 mass. % to 98 mass. % or even from 35 mass. % to 97 mass. % in terms of the total dry weight of the hydrophobic and hydrophilic components of the barrier layer.

As indicated above, in some embodiments, in addition to the hydrophobic component, the composition may contain a hydrophilic component. The hydrophilic component can serve to absorb moisture and increase the permeability of the composition at high relative humidity.

In specific embodiments, the hydrophilic component may comprise a polymer which, in the absence of crosslinking, is soluble in water.

In some embodiments, the hydrophilic component may comprise polyvinyl alcohol (PVOH), poly (vinyl pyrrolidone), starch, cellulose, salts of polyacrylic acid, polyacrylic acid, high carboxylation latexes, amines, polyethylene oxide, simple vinyl esters, highly hydrolyzed polymers (e.g. hydrolyzed maleic anhydride), polysaccharides or combinations thereof. In the most specific embodiments, the hydrophilic component may comprise polyvinyl alcohol (PVOH) or sodium polyacrylate.

In specific embodiments, the composition may contain more than one hydrophilic component. For example, as described in more detail below, the composition may contain a hydrophilic filler in place of or in conjunction with the hydrophilic component variants mentioned above, such as PVOH. In specific embodiments, the hydrophilic filler may be an inorganic hydrophilic filler, such as kaolin.

In some embodiments, hydrophilic components may be described by their% water absorption. In this context,% water absorption is determined using gravimetric measurements known in the art. The percentage of water absorption increases the relationship of permeability depending on relative humidity, but if the percentage of water absorption is too high, the hydrophilic component can become soluble and destabilize the film.

In some embodiments, the hydrophilic component may comprise a polymer having a percentage of water absorption of at least about 0.5%, at least about 2%, at least about 5%, or even at least about 7%, measured at 100% relative humidity and 23 ° C. In further embodiments, the hydrophilic component may comprise a polymer having a water absorption percentage of not more than about 20%, not more than about 15%, or even not more than about 10%, measured at 100% relative humidity and at 25 ° C. In addition, the hydrophilic component may have a percentage of water absorption in the range between any minimum and maximum values presented above, for example, in the range of from about 0.5% to about 20%, or even from about 7% to about 10%.

In some embodiments, the hydrophilic component may be described by its molecular weight. The use of a high molecular weight material that is soluble only at high temperatures can prevent the hydrophilic component from dissolving at low temperatures.

In some embodiments, the hydrophilic component can have a weight average molecular weight of at least about 50,000. In further embodiments, the hydrophilic component can have a molecular weight of not more than about 300,000. In addition, the hydrophilic component can have a molecular weight in the range between any minimum and maximum values, the above, for example, in the range from 50,000 to 300,000.

In some embodiments, the hydrophilic component may be present in the composition or in the barrier layer in an amount of at least about 0.1 mass. %, at least about 0.5 mass. % or even at least about 1 mass. % in terms of the total dry weight of the hydrophobic and hydrophilic components. In additional embodiments, the hydrophilic component may be present in the composition or in the barrier layer in an amount of not more than about 40 mass. %, not more than about 30 mass. %, not more than about 25 mass. %, not more than about 20 mass. %, not more than about 15 mass. %, not more than about 10 mass. % or even not more than about 8 mass. % in terms of the total dry weight of the hydrophobic and hydrophilic components. In addition, the hydrophilic component may be present in the composition or in the barrier layer in an amount in the range between any minimum and maximum values indicated above, for example, in the range of 0.1 mass. % to 35 mass. % or even from 1 mass. % to 15 mass. % in terms of the total dry weight of the hydrophobic and hydrophilic components.

In some embodiments, the composition may optionally further comprise the required additive components, such as inorganic fillers, viscosity modifiers, pigments, dyes, UV absorbers, glidants, surfactants, biocides, antifoam agents, deaerating agents, or combinations thereof.

In specific embodiments, the composition may contain a filler. In the most specific embodiments, the composition may have a filler content that is about no higher than the critical volumetric concentration of the filler pigment. For example, the critical volumetric concentration of the filler pigment is the concentration indicated above at which the binder does not occupy all the voids between the pigment particles. For example, it can be measured by pigment oil absorption. COCP can range from 20 to 68 volume percent, but values are usually about 50-55%.

In some embodiments, the filler may comprise clay, montmorillonite, calcium carbonate, barium sulfate, bentonite, muscovite, illite, cookeite, kaolinite, chlorite, or other filler materials. The filler may contain inorganic materials, organic materials, or combinations thereof. Particular fillers may include kaolin clay, CaCO ₃ , CaSO ₄ , BaSO ₄ , silica, talc, carbon black, diatomaceous earth, alumina, titanium dioxide, or combinations thereof. In some preferred embodiments, platelet morphology fillers, such as kaolin clay, can increase the angle of inclination in the curve of permeability versus relative humidity. This is due to the increased tortuosity of the films and may provide the possibility of applying thinner coatings having excellent characteristics. In some examples, the filler can provide reinforcement for the cured coating, can provide fire resistance to the cured coating, can improve the physical properties of the cured composition (for example, reduce the coefficient of linear thermal expansion (CLTE) compared to the CLTE of the cured composition without filler), or can provide other desired characteristics, for example , can increase the overall viscosity of the composition to facilitate a more uniform coating on the substrate. Exemplary fillers which are commercially available, include but are not limited to, Bentolite® fillers, Cloisite®, Nanofil®, Nanothix® Permont ^® and manufactured by Southern Clay Products, Inc.

In some embodiments, the filler may be present in the composition in an amount of from 0 mass. % to 85 mass. % in terms of the total dry weight of the composition or barrier layer.

In some examples, dispersions may contain one or more biocidal agents. The biocidal agent may be effective in stopping or preventing the growth of organisms on the coating and / or surface of the substrate. In some embodiments, the biocidal agent may be effective as a fungicide, such as an anti-mold agent, to prevent the growth of mold or other fungi on the surface of the substrate. In other embodiments, the biocidal agent may be effective in preventing the growth of bacteria, moss, algae, or other organisms on the surface of the substrate. If present, the biocidal agent may be present in an effective amount to stop or prevent the growth of bioorganisms.

In some embodiments, the dispersions may contain anti-stain additives. In some embodiments, the anti-stain additive may act to reduce or prevent the adsorption of materials into the coating and may, in general, help protect the coating from penetration of materials other than water and gases. For example, an anti-stain additive may provide oil resistance or oil-repellent properties to prevent non-polar particles from entering the coating. Anti-stain additives can also slow down the fading of a coating when exposed to heat, ultraviolet radiation, or other forms of energy. Illustrative anti-stain additives are commercially available from, for example, 3M (e.g., SRC-220, PM-5000, PM-1680, PM-4800) and AkzoNobel (e.g., Elotex ^® anti-stain additives).

When describing the composition as a whole, the composition may have a certain mass ratio. % hydrophobic component to the hydrophilic component. For example, in some embodiments, the ratio of the volume% of the hydrophobic component to the hydrophilic component may be at least about 3: 1, at least about 10: 1, or even at least about 30: 1. In further embodiments, the ratio of the volume% hydrophobic component to the hydrophilic component can be no more than about 200: 1, or even not more than about 100: 1. In addition, the ratio of the volume% hydrophobic component to the hydrophilic component may be in the range between any minimum and maximum values presented above, for example, in the range of from about 2: 1 to about 200: 1.

The composition may also have the desired viscosity. For example, in specific embodiments, the composition may have a viscosity of at least about 1000 cP at a shear rate of 1 s ⁻¹ at a temperature of 21 ° C. In further embodiments, the composition may have a viscosity of not more than about 1000 cP at a shear rate of 1000 s ⁻¹ at a temperature of 21 ° C. In addition, the composition may have a viscosity of at least about 5000 cP at a shear rate of 1 s ^-1 at a temperature of 21 ° C and a viscosity of not more than about 1000 cP at a shear rate of 1000 s ^-1 at a temperature of 21 ° C.

The composition can also be described by properties after curing. In this context, the cured composition refers to a barrier layer. In specific embodiments, the barrier layer may have a specific specific gravity of the coating. For example, the barrier layer may have a specific coating weight of at least about 10 g / m ² , at least about 20 g / m ^2, or even at least about 40 g / m ² . In further embodiments, the barrier layer may have a specific coating weight of not more than about 120 g / m ² . In addition, the barrier layer may have a specific coating mass in the range between any minimum and maximum values indicated above, for example, in the range of from about 10 g / m ² to about 120 g / m ² or even from about 40 g / m ² about 100 g / m ² .

The composition can be applied and cured, and it can have a variable permeability of water vapor depending on relative humidity. As described herein, water vapor permeability can be measured in accordance with ASTM E96 at a temperature of 21 ° C. and selected average relative humidity (RH) values. Water vapor permeability is a measure of the amount of water vapor that can pass through a material. When used to describe the characteristics of the cured composition, water vapor permeability is measured by applying the composition to a point bonded polypropylene nonwoven substrate with a specific coating weight of 75 g / m ² and curing the composition. Thus, the variable water vapor permeability can be standardized for a particular substrate for comparison and evaluation. The water vapor permeability is then measured in accordance with ASTM E96 at a temperature of 21 ° C. at various relative humidity values. Accordingly, in some embodiments, the composition may be configured to have variable water vapor permeability as a function of relative humidity after application and curing of the composition on a substrate.

In specific embodiments, the composition may exhibit the desired water vapor permeability at low, medium, and high relative humidity.

For example, in some embodiments, the composition may have a water vapor permeability of 1 perm or less with an average RH of 25%.

In further embodiments, the composition may have a water vapor permeability of 5 perm or less, or even 2.5 perm or less, with an average RH of 45%. In specific embodiments, the composition may have a water vapor permeability of 2.5 perm or less with an average RH of 45%.

In further embodiments, the composition may have a water vapor permeability of 6 perm to 12 perm with an average RH of 75%.

In further embodiments, the composition may have a water vapor permeability of at least about 12 perm, at least about 15 perm, with an average RH of 95%, or even at least about 20 perm. In specific embodiments, the composition may have a water vapor permeability value of at least about 20 perm with an average RH of 95%.

The coating composition may further have various combinations of the water vapor permeability values presented above at various relative humidity values.

For example, in specific embodiments, the composition may have a water vapor permeability value of about 1 perm or less with an average RH of 25%; and a vapor permeability value of at least about 20 perm, with an average RH of 95%.

In further embodiments, the composition may have a water vapor permeability value of about 1 perm or less with an average RH of 25%; a vapor permeability value of about 20 perm with an average RH of 95%; and a water vapor permeability value of 5 perm or less, or even 2.5 perm or less with an average RH of 45%.

In further embodiments, the composition may have a water vapor permeability value of about 1 perm or less with an average RH of 25%; a vapor permeability value of about 20 perm with an average RH of 95%; a water vapor permeability of 5 perm or less, or even 2.5 perm or less with an average RH of 45%; and a vapor permeability value in the range of 6 perm to 12 perm with an average RH of 75%.

 It should be understood that the above combinations of water vapor permeability values at various relative humidity values are illustrative combinations, and that all possible combinations of the above water vapor permeability values of the composition are included in the scope of the present description.

Additionally, it should be noted that if the coating shows the water vapor permeability indicated above at different RH values, then the change in the permeability value with increasing humidity can be, as indicated herein, linear or non-linear in the graph of log permeability versus relative humidity.

Another aspect of the present description relates to a coated substrate. For example, the composition described above can be applied to a substrate and cured. A particular advantage of some embodiments of the present description is the possibility of using the composition described above in combination with relatively porous substrates. For example, the characteristics of some embodiments of the composition described herein can completely fill voids in a porous substrate and thereby provide an effective coating for water vapor retention. Other compositions that can potentially provide variable water vapor permeability depending on humidity cannot be used with relatively porous substrates, since the composition “seeps” through the substrate, resulting in intermittent and ineffective coatings due to the low viscosity of the coating fluid. The authors of the present invention unexpectedly discovered the possibility of a synergistic combination of effective viscosity with variable permeability of water vapor, which makes it possible to use on relatively porous substrates. However, it should also be understood that some embodiments are not limited to relatively porous substrates, since it was found that the composition itself has a pronounced excellent variability in the permeability of water vapor.

In some examples, the aqueous dispersions described herein can be used to provide a cured coating on a building substrate, for example, kraft paper used to base fiberglass insulation, spunbond or point bonded non-woven materials, oriented chipboard, or as a windproof coating film or other materials that can be used to seal the cladding of a building, such as gypsum. Referring to FIG. 1, an article 100 is shown comprising a substrate 110 with a coating 120 applied thereon. The exact thickness of the substrate 110 and the coating 120 may vary, but in most cases the thickness of the substrate 110 is significantly greater than the thickness of the coating 120. Although the coating 120 is depicted as having substantially the same thickness in the direction of the plane of the substrate 110, such uniformity is not necessary. In particular, provided that the thickness of the coating 120 is effective to provide variable values for the water vapor permeability described herein, said thickness need not be uniform over the entire area of the substrate 110.

In some embodiments, the substrate 110 may be any suitable substrate commonly used in the construction industry. For example, buildings usually have some form of isolation of voids in the walls, floor and / or ceiling. Such insulation is often fiberglass insulation, which may include a vapor delay means to prevent moisture from entering insulated voids. Common vapor retention agents are asphalt coated kraft paper. Kraft paper itself has a high degree of moisture transmission. When used with asphalt and / or adhesive, kraft paper may act as a suitable means for vapor retention. Reducing the moisture content in the void in the wall can prevent the destruction of building materials and reduce thermal conductivity in the void in the wall, which can further contribute to lower energy costs. In some cases, the substrate 110 may be kraft paper, which can be applied to a larger building substrate, for example, fiberglass insulation, using adhesive or other suitable bonding means. The exact specific gravity of kraft paper can vary, and the illustrative specific gravity includes, but is not limited to, from about 11.34 kg (25 pounds) to about 34.02 kg (75 pounds) per 0.09 m ² (square foot) for example, about 17.69 kg (39 pounds). In some examples, the substrate 110 is a fabric. In some examples, the fabric may be woven or non-woven. In other cases, the coating can be applied directly to drywall or other materials commonly used to finish the interior of a building. For example, gypsum boards may be coated to provide variable values for the water permeability of the gypsum board. Similarly, to provide variable water vapor permeability values, the coating described herein can be applied to wood panels, wood planks, plywood, fiberboards or other materials used to decorate exterior or interior walls or ceilings. Additional construction substrates that may be coated with said coating may be readily selected by one of ordinary skill in the art upon reading the present description.

In the most specific embodiments, the substrate may include kraft paper cladding, plaster canvas, plastic sheet, gypsum wall panel, or combinations thereof. In further specific embodiments, the substrate can be described as a synthetic substrate. In addition, the substrate may be porous or may contain a porous structure, such that the coating composition or barrier layer may be located in the porous structure of the substrate, as described in more detail below. In the most specific embodiments, the substrate may comprise a fabric, such as a synthetic fabric, which has the porous structure described herein.

In some embodiments, coating 110 may be applied to substrate 120 by rolling, spraying, using a roller, or other means that can provide a layer of aqueous dispersion on the substrate. If necessary, additional coating layers can be applied to the cured coating layer to create a certain thickness of the coating layers.

In specific embodiments, the substrate may comprise a kraft paper lining.

In some embodiments, the substrate may be a textile substrate. For example, the textile substrate may comprise woven and / or nonwoven materials. In specific embodiments, the substrate may comprise a nonwoven material. Particular nonwovens may include spunbond or dot bonded fabrics.

In some examples, the coatings provided herein can be used to prepare precoated building substrates or to enable coating of building substrates directly at the place of use. For example, fiberglass insulating boards with kraft paper can be precoated with one or more components, followed by applying an additional component at the application site to obtain the final functional coating. In other cases, the coating can be obtained at the place of production, so that the installer eliminated the need to obtain a coating. In other cases, the installer may spray the coating onto the substrate after it is mounted to obtain a coating on the installed substrate. In some cases, the substrate may be a porous substrate, such as a non-woven substrate.

In some embodiments, the coated substrate may have some desired characteristics.

In specific embodiments, the total thickness of the substrate and barrier layer may be at least about 25 microns, at least about 50 microns, or even at least about 100 microns. In further embodiments, the total thickness of the substrate and barrier layer may be no more than about 1000 microns, not more than about 800 microns, or even not more than about 750 microns. In addition, the total thickness of the substrate and the barrier layer may be in the range between any minimum and maximum values presented above, for example, in the range from 25 μm to 1000 μm.

In some embodiments and referring in particular to FIG. 2, if the composition is deposited and cured on a relatively porous substrate 110, then the barrier layer 120 can penetrate to the desired depth P _D into the substrate, and in particular embodiments cannot flow through the entire substrate. For example, in some embodiments, the thickness of the substrate ST may be greater than P _D , so that one main surface of the substrate essentially does not contain a barrier layer. In addition, the barrier layer may have a thickness BL _T , as shown in FIG. 3, measured from the outermost surface of the barrier layer to the level at which the barrier layer penetrates the substrate.

Accordingly, in specific embodiments, the barrier layer can penetrate the substrate at least about 1%, at least about 5%, or even at least about 10% of the thickness of the substrate. In further embodiments, the barrier layer can penetrate the substrate by no more than 95%, not more than 90%, or even not more than 85% of the thickness of the substrate.

In addition, in specific embodiments, the barrier layer can penetrate the substrate by at least about 1%, at least about 5%, or even at least about 10% of the thickness of the barrier layer. In further embodiments, the barrier layer can penetrate the substrate by no more than 95%, not more than 90%, or even not more than 85% of the thickness of the barrier layer.

In other embodiments, the substrate may be fully saturated, so that a continuous layer of the composition is located on both major surfaces of the substrate. For example, P _D may be greater than or equal to ST. In addition, the barrier layer may have a desired thickness over both major surfaces of the substrate.

Embodiments of the present disclosure may exhibit a highly advantageous variable water vapor permeability, which varies with relative humidity. Similar to the description provided above with respect to the composition, a coated article containing a substrate and said composition may exhibit the required water vapor permeability at low, medium and high relative humidity. In this context, water vapor permeability is measured in accordance with ASTM E96 at a temperature of 21 ° C.

Accordingly, in some embodiments, the coated article may have a water vapor permeability of about 2 perm or less, or even 1 perm or less, with an average RH of 25%. In specific embodiments, the coated article may have a water vapor permeability value of about 1 perm or less at RH 25%.

In further embodiments, the coated article may have a water vapor permeability of at least about 12 perm, at least about 15 perm, with an average RH of 95%, or even at least about 20 perm. In specific embodiments, the coated article may have a water vapor permeability of at least about 20 perm with an average RH of 95%.

In further embodiments, the coated article may have a water vapor permeability of 5 perm or less, or even 2.5 perm or less with an average RH of 45%. In specific embodiments, the coated article may have a water vapor permeability of 2.5 perm or less with an average RH of 45%.

In further embodiments, the coated article may have a water vapor permeability of 6 perm to 12 perm with an average RH of 75%.

The coated article may further have various combinations of the water vapor permeability values presented above at different relative humidity values.

For example, in specific embodiments, the coated article may have a water vapor permeability of about 1 perm or less, with an average RH of 25%; and water vapor permeability equal to at least about 20 perm with an average RH of 95%.

In further embodiments, the coated article may have a water vapor permeability of about 1 perm or less with an average RH of 25%; water vapor permeability of about 5 perm, or even 2.5 perm or less, with an average RH of 45%; and water vapor permeability equal to at least about 20 perm with an average RH of 95%.

In further embodiments, the coated article may have a water vapor permeability of about 1 perm or less with an average RH of 25%; water vapor permeability of about 5 perm or less, or even 2.5 perm or less with an average RH of 45%; water vapor permeability equal to from 6 perm to 12 perm average RH 75%; and water vapor permeability of at least 20 perm with an average RH of 95%.

It should be understood that the above combinations of water vapor permeability values at various relative humidity values are illustrative combinations, and that all possible combinations of the above water vapor permeability values of the coated article are included in the scope of the present description.

In addition, it should be noted that if the coating exhibits the water vapor permeability indicated above at different RH values, then the change in the permeability value with increasing humidity can be, as indicated in this document, linear or non-linear in the graph of the logarithm of permeability versus relative humidity.

Another parameter of the specified product is the achievement of the predominant value of resistance to tearing with a nail. Resistance to tearing with a nail is a measure of the ability of a product to resist tearing after a puncture. In this context, tear resistance with a nail is measured in accordance with EIN 12310-1. Accordingly, a coated article may have a tear resistance of at least about 1 N / 5 cm, at least 5 N / 5 cm, or even at least about 10 N / 5 cm.

Another product parameter is its tensile strength. In this context, tensile strength is measured in accordance with EIN 12311-2. Accordingly, in some embodiments, the coated article may have a tensile strength of at least about 10 N / 5 cm, at least about 25 N / 5 cm, or even at least about 40 N / 5 cm. In addition, in some in embodiments, the coated article may have a tensile strength after UV aging of at least about 10 N / 5 cm, at least about 25 N / 5 cm, or even at least about 40 N / 5 cm. In this context, the tensile strength after UV aging is measured after UV aging for 180 hours at 0.8 W / m2.

Another parameter for describing the characteristics of the product is its adhesion to the adhesive tape. Adhesion to an adhesive tape is a measure of the ability of a coated article to adhere and adhere to the adhesive tape. In this context, the adhesion to the adhesive tape is measured in accordance with EIN 12317-2. Accordingly, a coated article may adhere to an adhesive tape of at least about 15 N / 5 cm, at least 20 N / 5 cm, or even at least about 25 N / 5 cm.

Some specific examples are described below to facilitate a better understanding of the technology described herein.

Item 1. A coating composition configured to selectively retain water vapor depending on moisture during curing, comprising:

hydrophobic component; and

hydrophilic component;

moreover, the composition after curing is effective to provide a variable permeability of water vapor equal to about 1 perm or less at an average RH of 25% and about 15 perm or more at an average relative humidity of 95%, measured according to ASTM E96 at 21 ° C, and tested by application and curing the composition on kraft paper.

Paragraph 2. Product made with the possibility of selective retention of water vapor depending on humidity, containing:

substrate of building material; and

a barrier layer deposited on a substrate of a building material, comprising:

hydrophobic component; and

hydrophilic component;

moreover, the product has a water vapor permeability of about 1 perm or less with an average RH of 25% and about 15 perm or more with an average relative humidity of 95%, measured according to ASTM E96 at 21 ° C.

Clause 3. The product is made with the possibility of selective retention of water vapor depending on humidity, containing:

a substrate of a building material comprising a fabric having a porous structure; and

a barrier layer deposited on a substrate of a building material;

moreover, the product has a water vapor permeability of about 1 perm or less with an average RH of 25% and about 15 perm or more with an average relative humidity of 95%, measured according to ASTM E96 at 21 ° C;

moreover, at least about 10% of the barrier layer is embedded in the porous structure of the tissue.

Item 4. The product is made with the possibility of selective retention of water vapor depending on humidity, containing:

a building material substrate comprising a nonwoven material having a porous structure; and

barrier layer;

moreover, the product has a water vapor permeability of about 1 perm or less with an average RH of 25% and about 15 perm or more with an average relative humidity of 95%, measured according to ASTM E96 at 21 ° C;

wherein at least about 10% of the barrier layer is embedded in the porous structure of the nonwoven fabric substrate.

Item 5. A method of obtaining an article configured to selectively retain water vapor depending on humidity, including:

providing a coating composition;

securing positives;

applying the composition to a substrate; and

drying the composition to form a barrier layer on a substrate;

moreover, the product has a water vapor permeability of about 1 perm or less with an average RH of 25% and about 15 perm or more with an average relative humidity of 95%, measured according to ASTM E96 at 21 ° C.

Item 6. A method of obtaining an article configured to selectively retain water vapor depending on humidity, including:

providing a water-based coating composition;

providing a substrate for building material;

applying the composition to a substrate of a building material; and

drying the composition to obtain a barrier layer on a substrate of a building material;

moreover, the product has a water vapor permeability of about 1 perm or less with an average RH of 25% and about 15 perm or more with an average relative humidity of 95%, measured according to ASTM E96 at 21 ° C.

Clause 7. The composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophobic component contains a water-insoluble polymer.

Clause 8. A composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophobic component contains a water-insoluble polymer dispersed in water.

Clause 9. The composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophobic component contains latex.

Clause 10. A composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophobic component contains styrene-butadiene, styrene-acrylic, acrylic, vinyl acetate-ethylene, vinylidene chloride, polyethylene, wax, polyvinyl chloride, polyvinyl butyral, polypropylene, butadiene or latex their combinations.

Clause 11. The composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophobic component contains styrene-butadiene latex.

Clause 12. The composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophobic component has a% carboxylation of not more than about 15%, not more than about 10%, not more than about 5%, or even not more than about 3%.

Clause 13. The composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophobic component has a glass transition temperature (Tg) of not more than about 35 ° C, not more than about 25 ° C, or even not more than about 15 ° C.

Clause 14. A composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophobic component has a glass transition temperature (Tg) in the range from -30 to 35 ° C, from -30 to 25 ° C, or even from -30 to 15 ° C.

Clause 15. The composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophobic component is present in the composition or in the barrier layer in an amount of at least about 15 mass. %, at least about 25 mass. %, at least about 35 mass. % or even at least about 45 mass. % in terms of the total dry weight of the hydrophobic and hydrophilic components.

Clause 16. The composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophobic component is present in the composition or in the barrier layer in an amount of not more than about 99 mass. %, not more than about 98 mass. % or even not more than about 97 mass. % in terms of the total dry weight of the hydrophobic and hydrophilic components of the barrier layer.

Clause 17. The composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophobic component is present in the composition or in the barrier layer in the range from 15 mass. % to 99 mass. %, from 25 mass. % to 98 mass. % or even from 35 mass. % to 97 mass. % in terms of the total dry weight of the hydrophobic and hydrophilic components of the barrier layer.

Clause 18. A composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophilic component contains a polymer which, in the absence of cross-linking, is soluble in water.

Clause 19. A composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophilic component contains polyvinyl alcohol (PVOH), poly (vinylpyrrolidone), starch, cellulose, salts of polyacrylic acid, polyacrylic acid, highly carboxylated latexes, amines , polyethylene oxide, vinyl ethers, highly hydrolyzed polymers (e.g., hydrolyzed maleic anhydride), polysaccharides, or combinations thereof.

Clause 20. A composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophilic component contains polyvinyl alcohol (PVOH) or sodium polyacrylate.

Clause 21. The composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophilic component contains a hydrophilic filler.

Clause 22. The composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophilic component contains an inorganic hydrophilic filler.

Paragraph 23. A composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophilic component contains a polymer which, in the absence of cross-linking, is soluble in water and an inorganic hydrophilic filler.

Paragraph 24. A composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophilic component contains a polymer having a percentage of water absorption of at least about 1%, at least about 3%, at least about 5%, or even at least about 7%, measured in accordance with gravimetric analysis at a relative humidity of 100% and at 23 ° C.

Paragraph 25. The composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophilic component contains a polymer having a molecular weight of at least about 50,000.

Paragraph 26. The composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophilic component contains a polymer having a molecular weight of not more than about 300,000.

Paragraph 27. The composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophilic component contains a polymer having a molecular weight in the range from 50,000 to 300,000.

Paragraph 28. The composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophilic component is present in the composition or in the barrier layer in an amount of at least about 0.1 mass. %, at least about 0.5 mass. % or even at least about 1 mass. % in terms of the total dry weight of the hydrophobic and hydrophilic components.

Paragraph 29. The composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophilic component is present in the composition or in the barrier layer in an amount of not more than about 40 mass. %, not more than about 30 mass. %, not more than about 25 mass. %, not more than about 20 mass. %, not more than about 15 mass. %, not more than about 10 mass. % or even not more than about 8 mass. % in terms of the total dry weight of the hydrophobic and hydrophilic components.

Paragraph 30. The composition, product or method according to any one of the preceding paragraphs, characterized in that the hydrophilic component is present in the composition or in the barrier layer in the range from 0.1 mass. % to 35 mass. % or even from 1 mass. % to 15 mass. % in terms of the total dry weight of the hydrophobic and hydrophilic components.

Paragraph 31. The composition, product or method according to any one of the preceding paragraphs, characterized in that the composition or barrier layer further comprises a filler.

Clause 32. The composition, product or method according to any one of the preceding paragraphs, characterized in that the composition or barrier layer further comprises a filler, wherein the composition or barrier layer has a filler content that is approximately no higher than the critical volume concentration of the filler pigment.

Paragraph 33. The composition, product or method according to any one of the preceding paragraphs, characterized in that the composition or barrier layer further comprises a filler, wherein the composition or barrier layer has a filler content in the range of from 0 mass. % to 85 mass. % in terms of the total dry weight of the composition or barrier layer.

Paragraph 34. The composition, product or method according to any one of the preceding paragraphs, characterized in that the composition or barrier layer further comprises a filler, and the filler contains clay, CaCO ₃ , CaSO ₄ , BaSO ₄ , silicon dioxide, talc, carbon black, diatomaceous earth, alumina, titanium dioxide, or combinations thereof.

Paragraph 35. The composition or method according to any one of the preceding paragraphs, characterized in that the ratio of the volume% hydrophobic component to the hydrophilic component is at least about 2: 1 and not more than about 200: 1.

Clause 36. The product or method according to any one of the preceding paragraphs, characterized in that the substrate contains building material.

Paragraph 37. The product or method according to any one of the preceding paragraphs, characterized in that the substrate comprises a Kraft paper cladding, a plaster canvas, a polymer sheet, or combinations thereof.

Paragraph 38. The product or method according to any one of the preceding paragraphs, characterized in that the substrate contains a textile building material.

Paragraph 39. The product or method according to any one of the preceding paragraphs, characterized in that the substrate contains a non-woven material.

Paragraph 40. The product or method according to any one of the preceding paragraphs, characterized in that the substrate contains a woven material.

Paragraph 41. The product or method according to any one of the preceding paragraphs, characterized in that the substrate contains a non-woven material containing spunbond or dot-bonded fabrics.

Paragraph 42. The product or method according to any one of the preceding paragraphs, characterized in that the barrier layer has a specific coating weight of at least about 20 g / m ² .

Paragraph 43. The product or method according to any one of the preceding paragraphs, characterized in that the barrier layer has a viscosity of at least about 500 cP at a shear rate of 1 s ^-1 ; at a temperature of 21 ° C, while the viscosity of the barrier layer is determined before the curing of the barrier layer.

Paragraph 44. The product or method according to any one of the preceding paragraphs, characterized in that the barrier layer has a viscosity of at least about 5000 cP at a shear rate of 1 s ^-1 and has a viscosity of less than 1000 cP at a shear rate of 1000 s ^-1 at a temperature of 21 ° C, wherein the viscosity of the barrier layer is determined before the curing of the barrier layer.

Paragraph 45. The product or method according to any one of the preceding paragraphs, characterized in that the total thickness of the substrate and the barrier layer is from 50 μm to 1000 μm.

Paragraph 46. The composition according to any one of the preceding paragraphs, characterized in that the barrier layer is configured to penetrate into the non-woven substrate at least about 5% of the thickness of the barrier layer.

Paragraph 47. The composition according to any one of the preceding paragraphs, characterized in that the composition is made with the possibility of penetration into the nonwoven substrate at not more than 90% of the thickness of the substrate.

Paragraph 48. The product or method according to any one of the preceding paragraphs, characterized in that the barrier layer penetrates into the substrate at least about 5% of the thickness of the substrate.

Paragraph 49. The product or method according to any one of the preceding paragraphs, characterized in that the product has a water vapor permeability of about 2.5 perm or less with an average RH of 45%, measured in accordance with ASTM E96 at 21 ° C.

Paragraph 50. The product or method according to any one of the preceding paragraphs, characterized in that the product has a water vapor permeability of 6 perm to 12 perm at an average RH of 75%, measured in accordance with ASTM E96 at 21 ° C.

Paragraph 51. The product or method according to any one of the preceding paragraphs, characterized in that the product has a tear resistance of at least about 10 N / 5 cm, measured in accordance with EIN 12310-1.

Paragraph 52. The product or method according to any one of the preceding paragraphs, characterized in that the product has a tensile strength of at least about 30 N / 5 cm, measured in accordance with EIN 12311-2.

Paragraph 53. The product or method according to any one of the preceding paragraphs, characterized in that the product has adhesion to an adhesive tape of at least about 25 N / 5 cm, measured in accordance with EIN 12317-2.

It should be noted that not all operations described above in the general description or in the examples are necessary, that part of these operations may not be necessary, and that one or more operations may be performed in addition to those described. In addition, the described order of operations is not necessarily the order in which they are performed.

The effects, other benefits, and solutions to problems are described above with respect to specific embodiments. However, these effects, advantages, solutions to problems and any features that may lead to any effect, advantage or solution to a problem or enhance them should not be considered critical, necessary or significant features of one or all of the claims.

The description and illustrations of the embodiments described herein are intended to provide a common understanding of the structure of various embodiments of the invention. The description and illustrations are not intended to provide a complete and comprehensive description of all elements and parts of devices and systems that use the structures or methods described herein. Individual options for implementation can also be presented in combination as part of one implementation option and, conversely, various details, which are described for brevity in the context of one implementation option, can also be presented individually or in any subcombination. In addition, reference to the values indicated in the ranges includes each and all values within the specified range. Many other implementations may become apparent to those skilled in the art after reading the present description. Other embodiments can be obtained and used from the present description, so that structural substitutions, logical substitutions, or other changes can be made without departing from the scope of the present description. Accordingly, the present description should be understood as illustrative and not limiting.

Examples

Example 1 - Permeability

Samples were obtained and tested for water vapor permeability in accordance with ASTM E96 at 21 ° C. and at a relative humidity of 25% RH, 45% RH, 75% RH and 95% RH.

Water vapor permeability test specimens were prepared by mixing the ingredients using a Coles air-driven agitator or homogenizer, or manually for 5 minutes at room temperature. The coatings were applied using a wound profile wire (spiral roller scraper) or by extrusion through a slot head at a thickness of about 75 μm.

Mass values. % presented for the hydrophobic and hydrophilic components are expressed relative to the total weight of the hydrophobic and hydrophilic components in the solid film. Mass values. % for the filler are expressed relative to the total weight of the coating composition.

Components

A - Styron DL-226 purchased from Styron - Represents styrene-butadiene latex with a low degree of carboxylation and a glass transition temperature of -14 ° C.

B - Styron DL-490 purchased from Styron - Represents a styrene-butadiene latex with a high degree of carboxylation with a glass transition temperature of 9 ° C.

C - PVOH Selvol 9-325 purchased from Sekisui - Represents pre-dissolved PVOH with a solids content of 8.5%, hydrolyzed by 98.4%, with a high molecular weight.

D - PAA Acumer 1510 purchased from Dow - Represents polyacrylic acid with a solids content of 25%.

E - Kaolin clay, purchased from Sigma Aldrich

NW is a nonwoven backing purchased from Hanes under the trade name Elite.

SD - method of coating through a slotted head

MR - method of coating using a spiral roller scraper

Table 1: Sample Composition and Permeability Values

Hydrophobic Hydrophilic Filler Substrate Way Permeability Sample A B C D E 25% 45% 75% 95% one 96 four Nw SD 2 3.4 5.3 2 95 5 Nw SD 1.3 3 11.7 25.1 3 94 6 Nw SD 1,2 3.3 16.8 43 four 95 5 Nw SD 0.8 15.6 55.8 152.3 5 95 5 Nw Mr one 2.7 12.5 31.6 6 95 5 Nw Mr one 1.7 3,1 four 7 94 6 33 Nw Mr 0.39 0.76 7.2 27 8 94 6 33 Craft Mr 0.5 1,1 6 26 9 94 6 40 Nw Mr 0.32 1,5 8.2 34 10 94 6 47 Nw Mr 0.28 1,5 9.1 38 eleven 94 6 55 Nw Mr 0.2 1,5 9.6 41 12 one hundred Craft Mr 0 21 fifty 156 13 one hundred Craft Mr 0.8 23 74 142 fourteen one hundred Craft Mr 1.4 3,7 9 twenty fifteen one hundred Craft Mr 0.9 16 40 116 16 Nylon, 0.05 mm (2 mil), BB - 0.8 2,4 11.9 37.1

As shown above, substrates with several coatings demonstrate the required permeability values comparable with the values of the comparative nylon film with a thickness of 0.05 mm (2 mil) (sample 16), and even exceed the performance of a nylon film with a thickness of 0.05 mm (2 mil) . In particular, sample 9 shows practically the same results as sample 16, except that it is more closed at 25% humidity and more open at 95% humidity, and both criteria are preferred and improved compared to a nylon film thickness 0.05 mm (2 mil).

As an illustrative example of the specific advantages of some embodiments of the present description, namely, the specific ratios of the components, when comparing the permeability profiles of samples 1, 2 and 3 from the table, it becomes clear that the angle of inclination increases sharply with increasing content of the hydrophilic component.

As an illustrative example of the specific advantage of some embodiments of the present description, namely, the particular materials selected, when comparing the permeability profiles of samples 2 and 4 from the table, it becomes clear that the choice of hydrophobic material can significantly affect the permeability profile.

As an illustrative example of the specific advantage of some embodiments of the present description, namely, the particular materials selected, when comparing the permeability profiles of samples 5 and 6 from the table, it becomes clear that the hydrophilic component C even more effectively affects the development of the permeability profile than the hydrophilic component D .

As an illustrative example of the specific advantages of some embodiments of the present description, namely, the choice of filler, when comparing the permeability profiles of samples 3, 7, 9, 10 and 11 from the table, it becomes clear that the introduction of kaolin filler significantly increases the barrier properties at low humidity and increases vapor permeability at high humidity.

As an illustrative example of the specific advantage of some embodiments of the present description, when comparing the permeability profile of sample 16 with the permeability profile of individual components (i.e., samples 12, 13, 14 and 15) from the table, it becomes clear that none of the components individually cannot match nylon permeability.

As an illustrative example of the specific advantage of some embodiments of the present description, when comparing the permeability profile of sample 9 with the permeability profile of individual components (samples 12 and 14) from the table, it becomes clear that none of the components individually can match the characteristics of sample 9. Accordingly Sample 9 illustrates a synergistic improvement in permeability profiles compared to individual components individually. The indicated synergism is completely unexpected.

As an illustrative example of the specific advantage of some embodiments of the present description, it becomes clear from the permeability profile of sample 15 that latex with a high degree of carboxylation can actually be sufficiently hydrophilic to exhibit a significant dependence of permeability on RH; however, the permeability of such materials at a humidity of 45% is too high to achieve the characteristics of sample 16.

As an illustrative example of the specific advantage of some embodiments of the present description, namely, the strength of the coating, when comparing the permeability profiles of samples 2 and 8 from the table, it becomes clear that the choice of substrate has only a small effect on the characteristics if the substrate is more open for vapor than the coating .

As an illustrative example of the specific advantages of some embodiments of the present description, namely, the strength of the coating, when comparing the permeability profiles of samples 2 and 6 from the table, it becomes clear that the method of coating weakly affects the characteristics.

Example 2: Mechanical Characteristics

The following examples were prepared as follows:

Sample 2A: 94 mass. % Styron DL-226 and 6 wt. % PVOH-325, calculated on the total weight of these two components. The sample additionally contained 33 mass. % kaolin filler, calculated on the total weight of the composition. The sample was applied in a machine direction on a Hanes Elite 100 fabric.

Sample 2B: 94 mass. % Styron DL-226 and 6 wt. % PVOH-325, calculated on the total weight of these two components. The sample additionally contained 33 mass. % kaolin filler, calculated on the total weight of the composition. The sample was applied laterally to a Hanes Elite 200 fabric.

Sample 2C: is a comparative example and contains a 50 μm thick Vario KM film, which was purchased from Saint-Gobain Corporation and used in the state upon receipt.

Then, the samples were tested for the initial tensile strength, tensile strength after UV aging for 180 hours at 0.8 W / m2 and tear resistance with a nail in accordance with the test procedure described above, to obtain the following results:

Table 2: Mechanical Characteristics

2A 2B 2C Tensile strength (N / 5 cm) 98 197 197 Tensile strength after UV aging (N / 5 cm) 65 88 64 Resistance to tearing with a nail (N / 5 cm) 31 61 fifteen

Example 3: Viscosity Measurements

Got three samples, as described below, and measured their viscosity before curing in accordance with the method described in this document:

Sample 3A: contained 95 mass. % Styron DL-226 and 5 wt. % PVOH-325, calculated on the total weight of these two components.

Sample 3B: contained 94 mass. % Styron DL-226 and 6 wt. % PVOH-325, calculated on the total weight of these two components. The sample additionally contained 33 mass. % kaolin filler, calculated on the total weight of the composition.

Sample 3C is a comparative sample containing 100 mass. % DL 226.

Sample 3D is a comparative sample containing 100 mass. % Selvol 9-325.

The results are shown in FIG. 3, which shows a diagram of viscosity measured (Pa * s) at various shear rates measured in s ^-1 . The viscosity of Example 3A and Example 3B was shown to be significantly higher than the viscosity of Comparative Examples 3C and 3D.

Claims (18)

1. The coating composition, made with the possibility of selective retention of water vapor depending on humidity during curing to obtain a barrier layer containing: a. hydrophobic component containing styrene-butadiene latex with% carboxylation from 0 to 20%; b. a hydrophilic component containing a polymer selected from polyvinyl alcohol and sodium polyacrylate, and a hydrophilic filler selected from kaolin clay; moreover, the coating composition after curing is effective to provide a variable permeability of water vapor equal to 1 perm or less at an average relative humidity of RH of 25% and about 15 perm or more at an average relative humidity of 95%, measured according to ASTM E96 at 21 ° C, and tested by applying and curing the composition on kraft paper. 2. The coating composition according to claim 1, characterized in that the coating composition after curing is effective to provide a water vapor permeability of 2.5 perm or less with an average RH of 45% and a water vapor permeability of 6 to 12 perm with an average RH of 75% measured according to ASTM E96 at 21 ° C and tested by applying and curing the composition on kraft paper. 3. The coating composition according to p. 1, characterized in that the hydrophobic component has a glass transition temperature from -30 ° C to 0 ° C. 4. The coating composition according to p. 1, characterized in that the hydrophobic component is present in an amount of from 35 wt.% To 97 wt.% In terms of the total dry weight of the hydrophobic and hydrophilic components. 5. The coating composition according to claim 1, characterized in that the polymer of the hydrophilic component has a weight average molecular weight of at least 50,000 and not more than 300,000. 6. Product made with the possibility of selective retention of water vapor depending on humidity, containing: a. substrate of building material; and b. a barrier layer deposited on a substrate of a building material obtained by curing the coating composition according to any one of paragraphs. 1-5. 7. The product according to claim 6, characterized in that the product has a water vapor permeability of about 2.5 perm or less with an average RH of 45% and a water vapor permeability of 6 to 12 perm with an average RH of 75%, measured according to ASTM E96 at 21 ° C. 8. The product according to claim 6, characterized in that the substrate contains kraft paper cladding, a plaster canvas, a polymer sheet, a gypsum wall panel, or combinations thereof. 9. The product according to p. 6, characterized in that the substrate contains kraft paper deposited on fiberglass insulation. 10. The product according to p. 6, characterized in that the substrate contains a woven or non-woven material. 11. The product according to p. 10, characterized in that the substrate contains a non-woven material containing spunbond or dot-bonded fabric. 12. The product according to p. 6, characterized in that the substrate contains a gypsum board. 13. The product according to claim 6, characterized in that the barrier layer has a specific coating weight of at least 20 g / m ² .

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