Breathable waterproof fabric

Abstract

The present invention aims to provide a breathable waterproof fabric that has high breathability and water pressure resistance, and furthermore, excellent oil resistance without the use of fluorine. [Solution] The present invention provides a breathable waterproof fabric 1, wherein a breathable waterproof film is laminated on one side of a fabric 6, and the breathable waterproof film is a laminate consisting of a porous substrate 2, a resin layer A3, and a resin layer B4 in that order, the resin layer A3 contains polyvinylpyrrolidone and / or vinylpyrrolidone copolymer and urethane resin, and the resin layer B4 contains acrylic resin having silicone side chains.

Description

Technical Field

[0001] The present invention relates to a moisture-permeable and waterproof fabric.

Background Art

[0002] A moisture-permeable and waterproof fabric is a fabric obtained by laminating a moisture-permeable and waterproof film that allows water vapor to permeate while not allowing liquid water to pass through, and a known fabric such as a woven fabric, knitted fabric, or non-woven fabric (hereinafter sometimes simply referred to as a fabric) with an adhesive. And since this fabric is excellent in moisture permeability and waterproof performance, it is mainly suitably used as a fabric for clothing such as cold-proof clothing and rain gear. Here, when oil such as sebum adheres to the moisture-permeable and waterproof fabric, a phenomenon occurs in which the oil penetrates into the inside of the moisture-permeable and waterproof fabric or the waterproof performance at the place where the oil adheres deteriorates, so oil resistance is required. As a method of imparting oil resistance to a moisture-permeable and waterproof fabric, a method of imparting oil resistance to a moisture-permeable and waterproof film is generally used. Specific examples of the moisture-permeable and waterproof film include porous or non-porous films mainly composed of fluorine-based resins, polyolefin-based resins, polyurethane-based resins, polyester-based resins, and the like. Further, as a method of imparting oil resistance to a moisture-permeable and waterproof fabric, a method of using a moisture-permeable and waterproof film using a fluorine-based resin for the moisture-permeable and waterproof fabric, or a method of using a moisture-permeable and waterproof film containing a fluorine-based surfactant as shown in Patent Document 1 is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, fluorine is difficult to decompose in nature, causing long-term environmental pollution and raising concerns about health risks. In particular, proposals to regulate fluorine use have been made in Europe. Furthermore, the trend towards regulating fluorine use is expected to accelerate globally, including in Europe, and the establishment of fluorine alternative technologies is anticipated as soon as possible.

[0005] Therefore, in view of the above background, the object of the present invention is to provide a breathable waterproof fabric that has high breathability and water pressure resistance, and furthermore, can have excellent oil resistance without using fluorine on at least one surface. [Means for solving the problem]

[0006] To solve the above problems, the present invention has the following features: (1) A breathable waterproof fabric having a breathable waterproof film laminated on one side of the fabric, wherein the breathable waterproof film is a laminate consisting of a porous substrate, a resin layer A and a resin layer B in that order, the resin layer A contains polyvinylpyrrolidone and / or vinylpyrrolidone copolymer and urethane resin, and the resin layer B contains acrylic resin having silicone side chains. (2) The breathable waterproof fabric according to (1), wherein the content ratio of polyvinylpyrrolidone and / or vinylpyrrolidone copolymer to urethane resin (content of polyvinylpyrrolidone and / or vinylpyrrolidone copolymer (mass%) / content of urethane resin (mass%)) is 0.8 or more and 16.0 or less. (3) The breathable waterproof fabric according to either (1) or (2), characterized in that the thickness of the resin layer A is 0.02 μm or more and 3.30 μm or less. (4) The breathable waterproof fabric according to any one of (1) to (3), characterized in that the thickness of the resin layer B is 0.31 μm or more and 3.00 μm or less. (5) A breathable waterproof fabric according to any one of (1) to (4), characterized in that the surface of the breathable waterproof film opposite to the resin layer B has micropores. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a breathable waterproof fabric that has high breathability and water pressure resistance, and furthermore, has excellent oil resistance even without the use of fluorine on at least one surface. [Brief explanation of the drawing]

[0008] [Figure 1] This is a conceptual diagram of a cross-section of a breathable waterproof fabric according to one embodiment of the present invention. [Modes for carrying out the invention]

[0009] The following describes the embodiments for carrying out the invention.

[0010] The breathable waterproof fabric of the present invention comprises a breathable waterproof film laminated on one side of the fabric, and furthermore, the breathable waterproof film is a laminate comprising a porous substrate, resin layer A and resin layer B laminated in that order. Herein, resin layer A contains polyvinylpyrrolidone and / or vinylpyrrolidone copolymer (hereinafter sometimes simply referred to as polyvinylpyrrolidone, etc.) and urethane resin, and resin layer B contains acrylic resin having silicone side chains.

[0011] The breathable waterproof fabric of the present invention is formed by laminating a breathable waterproof film on one side of the fabric. As will be described in detail later, the surface on the resin layer B side of the breathable waterproof film has oil resistance, so at least one side of the breathable waterproof fabric of the present invention has excellent oil resistance.

[0012] Furthermore, the above-mentioned breathable waterproof film is constructed by laminating a porous substrate, resin layer A, and resin layer B in that order. As will be described in more detail later, the surface of resin layer B of this breathable waterproof film is oil-resistant.

[0013] Here, the porous substrate mentioned above is a substrate having numerous fine through-holes. Porous substrates made from polymer resins are preferably used because they exhibit less strength reduction in high-humidity environments and are easy to form into thin films. Any of the polymer resins that make up the porous substrate can be polyolefins, polycarbonates, polyamides, polyimides, or polyamide-imides, but polyolefins are preferred from the viewpoint of production cost and availability.

[0014] Examples of monomer components constituting the above polyolefin resin include ethylene, propylene, 1-butene, 1-pentene, 3-methylpentene-1, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, 5-ethyl-1-hexene, 1-heptene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1-eicosene, vinylcyclohexene, styrene, allylbenzene, cyclopentene, norbornene, and 5-methyl-2-norbornene. Examples include homopolymers of these, copolymers of at least two selected from the group consisting of these monomer components, and blends of these homopolymers and copolymers. From the viewpoint of adjusting porosity and pore size, film-forming properties, and reducing production costs, it is more preferable that the monomer components constituting the above resin be selected from the group consisting of ethylene and propylene.

[0015] The basis weight of the porous substrate is preferably 15 g / m². 2 More preferably 10 g / m 2 More preferably 7 g / m 2 The following applies: By setting the basis weight of the porous substrate to below the upper limit mentioned above, a fabric with superior flexibility can be produced when it is made into a breathable waterproof fabric. Furthermore, by setting the basis weight of the porous substrate to above the lower limit mentioned above, it is possible to maintain sufficient strength to withstand the heat and tension during the coating process of the coating liquid.

[0016] The porosity of the porous substrate is preferably 20% or more, more preferably 30% or more, and still more preferably 40% or more. The higher the porosity of the porous substrate, the more flexible the moisture-permeable and waterproof fabric using the porous substrate can be made.

[0017] As a method for forming the porous substrate, a known wet method or a known dry method can be adopted.

[0018] The resin constituting the porous substrate may contain various additives such as an antioxidant, a heat stabilizer, a light stabilizer, a neutralizing agent, an antistatic agent, a lubricant composed of organic particles, and further a blocking inhibitor, a filler, and an incompatible polymer, etc., within a range not impairing the effects of the present invention. In particular, for the purpose of suppressing oxidative degradation due to heat history such as polypropylene, it is preferable to add an antioxidant. Further, if necessary, surface modification such as hydrophilization treatment such as corona treatment, plasma treatment, surfactant impregnation, and surface grafting may be performed.

[0019] The resin layer A included in the moisture-permeable and waterproof fabric of the present invention contains polyvinylpyrrolidone or the like.

[0020] By including polyvinylpyrrolidone or the like, the resin layer A can obtain high hygroscopicity, and a moisture-permeable and waterproof film having the resin layer A can also obtain high moisture permeability. The polyvinylpyrrolidone that can be used in the present invention refers to a polymer in which only N-vinylpyrrolidone is polymerized, and the vinylpyrrolidone copolymer refers to a polymer in which the main monomer is N-vinylpyrrolidone and vinyl acetate, vinyl caprolactam or the like is copolymerized as a comonomer. The type and content ratio (comonomer / main monomer) of the above comonomer in the vinylpyrrolidone copolymer are not particularly limited as long as the effects of the present invention are not impaired, and can be appropriately selected in consideration of the solubility in the solvent to be used and the physical properties of the coating solution. The weight average molecular weight of polyvinylpyrrolidone or the like is not particularly limited, but since it is easy to have a viscosity that can form a coating film with a uniform thickness when applied to the above porous substrate as a coating solution, it is preferably 1000 or more and 600000 or less, more preferably 60000 or more and 500000 or less, and particularly preferably 150000 or more and 400000 or less.

[0021] In addition, the resin layer A provided in the present invention contains a urethane resin in addition to polyvinylpyrrolidone or the like. Here, since the resin layer A contains a urethane resin, the resin layer A is tough even if it is thin, and furthermore, it forms a surface with excellent flatness after closing the pores existing in the porous substrate, so that a resin layer B with a uniform thickness can be obtained when the resin layer B is laminated.

[0022] The urethane resin used in the present invention preferably has hydrophilic groups such as hydroxyl groups and carbonyl groups. Since the urethane resin has hydrophilic groups, the affinity with polyvinylpyrrolidone or the like is improved, and when mixed and used with polyvinylpyrrolidone or the like, it becomes easier to form a resin layer with a more uniform thickness.

[0023] The content ratio of polyvinylpyrrolidone, etc. to urethane resin in resin layer A (content of polyvinylpyrrolidone, etc. (mass%) / content of urethane resin (mass%)) is preferably 0.8 or more and 16.0 or less. A content ratio of polyvinylpyrrolidone, etc. to urethane resin of 0.8 or more is preferable because it allows for sufficient breathability as a breathable waterproof fabric. A content ratio of polyvinylpyrrolidone, etc. to urethane resin of 16.0 or less allows for a smooth resin layer A, thus enabling the creation of a breathable waterproof fabric with excellent oil resistance. A more preferable range for the content ratio of polyvinylpyrrolidone, etc. to urethane resin is 1.0 or more and 9.0 or less, and an even more preferable range is 1.0 or more and 3.0 or less.

[0024] The thickness of resin layer A is preferably between 0.02 μm and 3.30 μm. If the thickness of resin layer A is 0.02 μm or more, a resin layer A with uniform thickness is obtained, resulting in a breathable waterproof fabric with excellent oil resistance. If the thickness of resin layer A is 3.30 μm or less, a breathable waterproof fabric with excellent breathability is obtained. A more preferable range for the thickness of resin layer A is between 0.05 μm and 2.3 μm, and an even more preferable range is between 0.10 μm and 1.30 μm.

[0025] The resin layer B of the breathable waterproof fabric of the present invention is a resin layer containing an acrylic resin having silicone side chains. By containing an acrylic resin having silicone side chains in resin layer B, the surface energy of resin layer B is lowered, and the breathable waterproof fabric on which the above resin layer B is laminated can obtain high oil resistance. Furthermore, by laminating resin layer B onto a resin layer A of uniform thickness, a resin layer B of the thickness described later can be easily formed, thus achieving both high oil resistance and breathability.

[0026] The acrylic resin having silicone side chains that can be used in the present invention is preferably a silicone acrylic graft copolymer resin obtained by polymerizing a polyorganosiloxane with an acrylic acid ester monomer and / or a methacrylic acid ester monomer. The above polyorganosiloxane has a siloxane bond as its main backbone and has monovalent hydrocarbon groups having 1 to 20 carbon atoms. Examples of monovalent hydrocarbon groups having 1 to 20 carbon atoms include alkyl groups such as methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, dodecyl, tetradecyl, hexadecyl, and octadecyl groups, cycloalkyl groups such as cyclopentyl, cyclohexyl, and cycloheptyl groups, and alkenyl groups such as vinyl and allyl groups.

[0027] The above-mentioned acrylic acid ester monomers and / or methacrylic acid ester monomers specifically include methyl (meth)acrylate, isopropyl (meth)acrylate, ethyl (meth)acrylate, cyclohexyl (meth)acrylate, and the like.

[0028] In the above-mentioned silicone-acrylic graft copolymer resin, the mass ratio of polyorganosiloxane to acrylic acid ester monomer and / or methacrylic acid ester monomer (polyorganosiloxane (mass%) / acrylic acid ester monomer and / or methacrylic acid ester monomer (mass%)) is 0.11 to 9.00. When the above mass ratio is 0.11 or higher, the surface energy of the resin layer B is reduced, and when the above mass ratio is 9.00 or lower, the flatness of the surface composed of the resin layer B, one of the two surfaces of the breathable waterproof fabric of the present invention, is excellent, and as a result, the oil resistance of the resulting breathable waterproof fabric is excellent.

[0029] The thickness of resin layer B is preferably 0.31 μm or more and 3.00 μm or less. If the thickness of resin layer B is 0.31 μm or more, a breathable waterproof fabric with excellent oil resistance is obtained. If the thickness of resin layer B is 3.00 μm or less, a breathable waterproof fabric with excellent breathability is obtained. A more preferable range for the thickness of resin layer B is 0.31 μm or more and 2.00 μm or less, and a particularly preferable range is 0.31 μm or more and 1.60 μm or less. It is preferable that the resin components contained in resin layer A and / or resin B of the present invention have a cross-linked structure. It is preferable that resin layer A and / or resin layer B have a cross-linked structure because it improves the oil resistance and water resistance of the resulting breathable waterproof fabric.

[0030] The method for crosslinking resin layer A and / or resin layer B is not particularly limited, but a method of modifying the composition of the coating film by incorporating a polymerization initiator into resin layer A and / or resin B and subjecting it to an active energy ray irradiation treatment such as ultraviolet irradiation is preferred because it results in a small temperature rise during the manufacturing process of the breathable waterproof fabric and causes little damage to the porous substrate.

[0031] The resin layer A and / or resin B of the present invention may optionally contain additives. Examples of additives include inorganic or organic particles, flame retardants, antifungal agents, preservatives, dyes, and pigments.

[0032] The method for forming resin layer A and resin layer B is not particularly limited, but a resin layer can be formed on the substrate by applying a coating liquid for resin layer formation onto the substrate and drying the solvent as necessary.

[0033] Methods for applying the coating liquid to a porous substrate include known wet coating methods such as spray coating, dip coating, spin coating, knife coating, kiss coating, gravure coating, slot die coating, roll coating, bar coating, screen printing, inkjet printing, pad printing, and other types of printing. The coating may also be performed in multiple stages, or two different coating methods may be combined. Preferred coating methods are wet coatings such as gravure coating, bar coating, and slot die coating.

[0034] After the coating step, the solvent is removed from the coated liquid in the drying step. Methods for removing the solvent include convection hot air drying, where hot air is applied to the porous substrate; radiant heat drying, where infrared rays from an infrared drying device are absorbed by the substrate and converted into heat for heating and drying; and conductive heat drying, where heat is conducted from a wall heated by a heat transfer medium for heating and drying. Among these, convection hot air drying is preferred because it has a high drying speed. The drying temperature must be below the melting point of the resin used in the porous substrate, more preferably 80°C or lower, and even more preferably 60°C or lower. It is preferable to set the drying temperature within the above range because the thermal shrinkage rate of the porous substrate will be 5% or less.

[0035] The breathable waterproof fabric of the present invention preferably comprises a breathable waterproof film and a fabric laminated together with an adhesive. Furthermore, it is preferable that there are adhesive and non-adhesive portions between the layers of the breathable waterproof film and the fabric. Here, the adhesive portion refers to the portion where adjacent breathable waterproof film and fabric layers are bonded together via the adhesive. Having an adhesive portion between the layers of the breathable waterproof film and the fabric makes the fabric less likely to peel off, resulting in superior garment strength. Moreover, the breathable waterproof fabric of the present invention has superior breathability due to the presence of a non-adhesive portion between the breathable waterproof film and the fabric. The area ratio of the adhesive portion to the non-adhesive portion (area of ​​the adhesive portion / area of ​​the non-adhesive portion) is preferably 0.2 to 0.8. A more preferable range for the area ratio of the adhesive portion to the non-adhesive portion is 0.4 to 0.6.

[0036] The surface on which the breathable waterproof film and the fabric are bonded is not particularly limited, but it is preferable to bond the fabric to the side of the breathable waterproof film facing the resin layer B, so that the micropores are exposed on the side of the breathable waterproof film opposite to the resin layer B. With the above configuration, when the breathable waterproof fabric is used as a garment fabric, with the fabric side of the breathable waterproof fabric facing the outside of the garment, even if dirt such as oil adheres to the outside of the garment, the dirt will not penetrate to the porous substrate or resin layer A of the breathable waterproof film, and the dirt can be removed by washing the garment, which is preferable.

[0037] The above-mentioned fabrics are not particularly limited, but include synthetic fibers such as polyester, nylon, acrylic, polyurethane, acetate, rayon, and polylactic acid; natural fibers such as cotton, linen, silk, and wool; and woven, knitted, and nonwoven fabrics made from blends, spun, interwoven, or interknitted products of these fibers. The fiber structures may be dyed, printed, or otherwise treated with antistatic, water-repellent, antibacterial, deodorizing, antimicrobial, UV-blocking, deodorizing, water-absorbing, or moisture-absorbing finishes.

[0038] Furthermore, the adhesives mentioned above are not particularly limited, but may include urethane resin, polyvinyl chloride resin, acrylic resin, etc., dissolved in an organic solvent or melted by heating.

[0039] The method for manufacturing the breathable waterproof fabric of the present invention is not particularly limited, but the following methods are examples. First, a resin solution containing an adhesive is applied to the breathable waterproof film of the present invention, dried at 50 to 130°C, and then the fabric is laminated onto the porous substrate surface to which the adhesive has been applied. If necessary, the fabric is nipped using a nip or heated roll and bonded together by a dry lamination method. Alternatively, the fabric can also be manufactured by a wet lamination method in which the fiber fabric 1 is bonded to the resin solution containing the adhesive without drying, or by a hot melt lamination method in which an adhesive that becomes plastic with heat is applied.

[0040] Here, Figure 1 is a conceptual diagram of a cross-section of a breathable waterproof fabric according to one embodiment of the present invention. This breathable waterproof fabric 1 has a laminated structure in which a resin layer A (indicated by reference numeral 3), a resin layer B (indicated by reference numeral 4), an adhesive 5, and a fabric 6 are laminated in this order on one surface of a porous substrate 2. [Examples]

[0041] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. The measurement method used in these examples is shown below. Unless otherwise specified, when obtaining a numerical value from the measured value, two measurements were taken and the average value was adopted as the numerical value.

[0042] <Measurement method> (1) Thickness of resin layer A A breathable waterproof fabric was cut parallel to its thickness using a microtome with a knife tilt angle of 3°. Next, the cross-section of the breathable waterproof fabric was observed using a scanning electron microscope, and the thickness of resin layer A in contact with the porous substrate was measured using the microscope's length-measuring function.

[0043] (2) Thickness of resin layer B A breathable waterproof fabric was cut parallel to its thickness using a microtome with a knife inclination angle of 3°. Next, the cross-section of the breathable waterproof fabric was observed using a scanning electron microscope, and the thickness of resin layer B in contact with resin layer A was measured using the microscope's length-measuring function.

[0044] (3) Identification and content of components contained in the resin layer A 5g test piece of breathable waterproof film was measured using pyrolysis gas chromatography (pyrolysis GC-MS) to identify the components contained in the resin layer, and further, the content of each component in the resin layer was determined.

[0045] (4) Moisture permeability of breathable waterproof fabric The moisture permeability was measured according to the moisture permeability test method (A-1 method) of textile products in JIS L 1099 (2012). The cup used had a diameter of 60 mm and a depth of 25 mm. Five circular moisture-permeable waterproof fabrics with a diameter of 70 mm were prepared as test specimens. The test specimens were left at a temperature of 20°C and a humidity of 65% RH for 24 hours. Next, the test specimens were placed in cups containing calcium chloride for moisture measurement (manufactured by Wako Pure Chemical Industries, Ltd.), and the initial weight (T0) of the test specimen, calcium chloride, and cup combined was measured. Then, the test specimens were placed in a constant temperature and humidity chamber set to a temperature of 40°C and a humidity of 90% RH, and the combined weight (T1, T2, and T3) of the test specimen, calcium chloride, and cup was measured at 1 hour, 2 hours, and 3 hours after the start of the chamber. The moisture permeability was calculated using the following formula, and the average value of the five specimens was used to determine the moisture permeability (g / m²). 2 ( / hr) Moisture permeability (g / m 2 / hr)={[((T0-T1) / T1)+((T0-T2) / T2)+((T0-T3) / T3)] / 3}×100.

[0046] (5) Water pressure resistance The measurement was performed in accordance with JIS L 1092:2009 Method B (Test method for waterproofness of textile products). Specifically, a breathable waterproof fabric was fixed to a water pressure tester, and water pressure was applied to the test piece at a pressure increase rate of 60 cm / min. The water pressure was measured when three water droplets were released.

[0047] (6) Oil resistance A breathable waterproof fabric was immersed in toluene, and the breathable waterproof film was peeled off the fabric to obtain a sample of the breathable waterproof film. 100 μl of test solution was dropped onto the obtained sample, and after 20 hours, the excess test solution was wiped off, and the oil penetration state in the area where the solution was dropped was observed. Oil resistance was evaluated according to the following criteria.

[0048] S: No traces of the test solution are visible.

[0049] A: There are traces of the test solution in the area where it was dropped.

[0050] B: There are traces of the test solution where it was dropped, but it has not penetrated to the back.

[0051] C: The test solution has penetrated to the back side. The test solution was the following mixture.

[0052] 1. Olive oil: 61.9 wt% 2. Oleic acid: 38.0 wt% 3. Oil Red: 0.1 wt%.

[0053] [Porous base material] (A1) Porous polyethylene film (thickness 12 μm, porosity 43%, F12CD1, manufactured by Toray Industries, Inc.).

[0054] [Polyvinylpyrrolidone and / or vinylpyrrolidone copolymer of resin layer A] (B1) Polyvinylpyrrolidone ("Luvitec K85" (registered trademark), manufactured by BASF).

[0055] [Urethane resin in resin layer A] (C1) Aqueous dispersion of polyurethane resin (solids content: 30 wt%, "Superflex 150" (registered trademark), manufactured by Daiichi Kogyo Seiyaku Co., Ltd.).

[0056] [UV initiator for resin layer A] (D1) UV initiator ("Omnirad" (registered trademark) 184, manufactured by IGMresins).

[0057] [Acrylic resin having silicone side chains in resin layer B] (E1) Acrylic resin paint with silicone side chains (8SS-723, manufactured by Taisei Fine Chemical Co., Ltd.).

[0058] [UV initiator for resin layer B] (F1) UV initiator ("Omnirad"® 184, manufactured by IGMresins).

[0059] [Fabric] (G1) Polyester fabric conforming to JIS L 0803:2011.

[0060] (Example 1) The materials were mixed according to the proportions shown in Table 1 for resin layer A, and stirred until a uniform liquid was obtained to obtain a mixed solution of resin layer A. The obtained mixed solution of resin layer A was applied to the surface of a porous substrate using a bar coater with a grit of 8. After application, it was dried in a hot air oven set to 60°C for 1 minute. Next, the porous substrate coated with resin layer A was subjected to UV irradiation at 500 mJ / cm² in an air atmosphere using a UV irradiation device (ECS-301, manufactured by iGraphics Co., Ltd.). 2 UV radiation of the specified intensity was applied to crosslink resin layer A. Next, the materials were mixed according to the mixing ratio of resin layer B shown in Table 1 and stirred until a uniform liquid was obtained to obtain a mixed solution of resin layer B. The obtained mixed solution of resin layer B was applied to resin layer A using a bar coater with a grit of 8. After application, it was dried in a hot air oven set to 60°C for 1 minute. Next, the porous substrate coated with resin layer B was subjected to UV irradiation at 500 mJ / cm² in an atmospheric atmosphere using a UV irradiation device (ECS-301 manufactured by I-Graphics Co., Ltd.). 2 UV light of a specified intensity was irradiated to crosslink resin layer B, thereby obtaining a breathable waterproof film. Next, a hot melt adhesive was applied using a hot melt spray at a rate of 10 g / m². 2 The resin layer B was applied to the surface in this manner, and a breathable waterproof fabric was obtained by laminating it with the fabric. The physical properties and evaluation results of the obtained breathable waterproof fabric are shown in Tables 1 and 2.

[0061] (Examples 2-15, Comparative Examples 1-2) A laminated film was obtained in the same manner as in Example 1, except that the mixed solution of resin layer A and the thickness of each resin layer were as shown in Table 1. The physical properties and evaluation results of the obtained breathable waterproof fabric are shown in Tables 1 and 2.

[0062] As shown in Table 2, Comparative Example 1 lacks resin layer B, resulting in inferior oil resistance. Comparative Example 2 lacks resin layer A, so resin layer B is not uniformly formed, resulting in inferior oil resistance.

[0063] [Table 1]

[0064] [Table 2] [Explanation of Symbols]

[0065] 1: Breathable waterproof fabric 2: Porous base material 3: Resin layer A 4: Resin layer B 5: Adhesive 6:Fabric [Industrial applicability]

[0066] The present invention provides a porous film that possesses the necessary breathability and water resistance for use as a waterproof and breathable fabric, as well as excellent oil resistance. The breathable and waterproof fabric of the present invention can be used in applications where breathability and water resistance are required. Specifically, it is suitably used in clothing such as cold-weather clothing, rain clothing, gloves, hats, and shoes, but it can also be used in a wide range of other fields, such as hygiene products such as bed sheets, pillowcases, and back sheets for absorbent items such as sanitary napkins and disposable diapers, as well as packaging materials such as food bags for vegetables and fruits, bags for various industrial products, interior materials for transport vehicles such as railway cars, ships, and aircraft, livestock products, agricultural products such as garbage bags and compost bags, building materials such as buildings, houses, and decorative panels, medical supplies, separation membranes, light diffusers, reflective sheets, or battery separators.

Claims

1. This is a breathable waterproof fabric in which a breathable waterproof film is laminated on one side of the fabric. The aforementioned moisture-permeable waterproof film is a laminate in which a porous substrate, resin layer A, and resin layer B are laminated in that order. The resin layer A comprises polyvinylpyrrolidone and / or vinylpyrrolidone copolymer and urethane resin. The resin layer B includes an acrylic resin having silicone side chains. Breathable waterproof fabric.

2. The content ratio of the polyvinylpyrrolidone and / or vinylpyrrolidone copolymer to the urethane resin (content of polyvinylpyrrolidone and / or vinylpyrrolidone copolymer (mass%) / content of urethane resin (mass%)) is 0.8 or more and 16.0 or less. The breathable waterproof fabric according to claim 1.

3. The thickness of the resin layer A is 0.02 μm or more and 3.30 μm or less. A breathable waterproof fabric according to claim 1 or 2.

4. The thickness of the resin layer B is 0.31 μm or more and 3.00 μm or less. A breathable waterproof fabric according to any one of claims 1 to 3.

5. The breathable waterproof fabric according to any one of claims 1 to 4, wherein micropores are exposed on the surface opposite to the surface of the resin layer B of the breathable waterproof film.

Images