US20090324929A1 - Composite Membrane and Moisture Adjustment Module Using Same - Google Patents

Composite Membrane and Moisture Adjustment Module Using Same Download PDF

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Publication number
US20090324929A1
US20090324929A1 US12/239,037 US23903708A US2009324929A1 US 20090324929 A1 US20090324929 A1 US 20090324929A1 US 23903708 A US23903708 A US 23903708A US 2009324929 A1 US2009324929 A1 US 2009324929A1
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US
United States
Prior art keywords
composite membrane
membrane
moisture
porous
composite
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/239,037
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English (en)
Inventor
Keiichi Yamakawa
Wiliam B. Johnson
Mahesh Murthy
Thomas Berta
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WL Gore and Associates GK
WL Gore and Associates Inc
Original Assignee
Japan Gore Tex Inc
Gore Enterprise Holdings Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Japan Gore Tex Inc, Gore Enterprise Holdings Inc filed Critical Japan Gore Tex Inc
Assigned to GORE ENTERPRISE HOLDINGS, INC. reassignment GORE ENTERPRISE HOLDINGS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MURTHY, MAHESH, BERTA, THOMAS, JOHNSON, WILLIAM B.
Assigned to JAPAN GORE-TEX, INC. reassignment JAPAN GORE-TEX, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YAMAKAWA, KEIICHI
Priority to PCT/US2009/003832 priority Critical patent/WO2009158030A1/en
Priority to CN200980124878.3A priority patent/CN102076401B/zh
Priority to KR1020117001741A priority patent/KR101701521B1/ko
Priority to CA2728518A priority patent/CA2728518A1/en
Priority to EP09770568.5A priority patent/EP2323753B8/en
Priority to JP2011516321A priority patent/JP2011525857A/ja
Publication of US20090324929A1 publication Critical patent/US20090324929A1/en
Assigned to W. L. GORE & ASSOCIATES, INC. reassignment W. L. GORE & ASSOCIATES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GORE ENTERPRISE HOLDINGS, INC.
Assigned to W.L. GORE & ASSOCIATES, CO., LTD. reassignment W.L. GORE & ASSOCIATES, CO., LTD. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: JAPAN GORE-TEX, INC.
Priority to US14/663,645 priority patent/US9853305B2/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
    • H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
    • H01M8/04119—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
    • H01M8/04126—Humidifying
    • H01M8/04149—Humidifying by diffusion, e.g. making use of membranes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
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    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
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Definitions

  • an olefin-based hollow filament or a hollow filament obtained using an ion-exchange fluororesin is used to humidify the gas fed to a fuel electrode or an air electrode of a fuel cell.
  • hollow filaments have high ventilation resistance and make it difficult to raise the flow rate. Therefore, a membrane-type moistening module using a vapor-permeable membrane shows promise.
  • a composite membrane 10 having a moisture-permeable resin layer 30 on both surfaces of a porous polymeric resin article 20 is disclosed, for example, in Patent Document 1 as a vapor-permeable membrane, as shown in FIG. 1 .
  • the composite membrane 10 cannot exhibit sufficient moisture permeability with one membrane. Therefore, as shown in FIG. 2 , a plurality of composite membranes 10 is superposed while open spaces are left that can serve as gas channels. Also, spacers 50 are inserted between the composite membranes 10 in order to form the open spaces.
  • the moisture-permeable resin layers 30 are exposed on the surface of the composite membranes 10 , the moisture-permeable resin layers 30 are damaged by the spacers 50 .
  • the moisture-permeable resin layers 30 have inadequate durability.
  • the adhesive strength between the composite membranes 10 and the spacers 50 is also low.
  • Patent Document 2 discloses a composite membrane 10 in which, in a layered object composed of a porous membrane 20 and a reinforcing element (nonwoven fabric or the like) 40 , a moisture-permeable resin layer 30 is interposed between the reinforcing element 40 and the porous membrane 20 along the border that faces the membrane, as shown in FIG. 3 .
  • the risk that the moisture-permeable resin layer 30 will be damaged by the spacer 50 decreases since the moisture-permeable resin layer 30 is protected with the reinforcing element 40 and the porous membrane 20 .
  • Patent Document 3 will be described below.
  • Patent Document 1 Japanese Laid-Open Patent Publication No. 2006-160966.
  • Patent Document 2 Japanese Laid-Open Patent Publication No. 2006-150323.
  • Patent Document 3 U.S. Pat. No. 5,418,054.
  • the present invention relates to a composite membrane capable of selectively transmitting water included in gas and liquid; preferably relates to a composite membrane that can be used as a dehumidification membrane, moistening membrane, pervaporation membrane (for example, a membrane for separating water and other liquids (such ethanol and other alcohols)); and more preferably relates to a composite membrane that can be used as a separation membrane to selectively transmit water vapor from a hot and humid gas (for example, a moistening membrane for using the water vapor included in the effluent gas (especially effluent gas on the side of an air electrode) of a fuel cell electrode in the humidification of the gas fed to a fuel electrode or the air electrode (especially the fuel electrode)).
  • a composite membrane capable of selectively transmitting water included in gas and liquid
  • a composite membrane that can be used as a dehumidification membrane, moistening membrane, pervaporation membrane for example, a membrane for separating water and other liquids (such ethanol and other alcohols)
  • the present invention was developed with a focus on circumstances such as those described above, and an object thereof is to provide a composite membrane 10 in which the balance between the gas barrier properties and moisture permeability is further improved; and to provide a moisture adjustment module using the composite membrane 10 .
  • Another object of the present invention is to provide a composite membrane 10 further having excellent scratch resistance when brought into contact with a spacer or another external object 50 ; and to provide a moisture adjustment module using the composite membrane.
  • Yet another object of the present invention is to provide a composite membrane 10 further having excellent adhesive properties in relation to an external object (spacer) 50 ; and to provide a moisture adjustment module using the composite membrane.
  • Yet another object of the present invention is to provide a less expensive composite membrane 10 that provides very high moisture vapor transport rates, very low air permeability and excellent long-term durability while simultaneously utilizing reduced quantities of a relatively expensive fluoropolymer resin; and a moisture adjustment module using the composite membrane.
  • the present invention was developed with a focus on circumstances such as those described above, and an object thereof is to provide a composite membrane 10 in which the balance between the gas barrier properties and moisture permeability is further improved; and to provide a moisture adjustment module using the composite membrane 10 .
  • Another object of the present invention is to provide a composite membrane 10 further having excellent scratch resistance when brought into contact with a spacer or another external object 50 ; and to provide a moisture adjustment module using the composite membrane.
  • Yet another object of the present invention is to provide a composite membrane 10 further having excellent adhesive properties in relation to an external object (spacer) 50 ; and to provide a moisture adjustment module using the composite membrane.
  • Yet another object of the present invention is to provide a less expensive composite membrane 10 that provides very high moisture vapor transport rates, very low air permeability and excellent long-term durability while simultaneously utilizing reduced quantities of a relatively expensive fluoropolymer resin; and a moisture adjustment module using the composite membrane.
  • First embodiments of the invention include a composite membrane wherein a moisture-permeable resin layer is interposed between porous membranes that constitute a pair; and the mean thickness of the moisture-permeable resin layer is 5 ⁇ m or less.
  • the moisture permeable resin can comprise a water-resistance, moisture permeable resin such that its degree of swelling is 20 times or less. It may also comprise a cross-linked polyvinyl alcohol, or an ion exchange fluororesin, or a perfluorosulfonic acid polymer. Additionally, the moisture-permeable resin layer may, at least in part, be embedded in one or both of the porous membranes.
  • the porous membranes of these embodiments may have a mean pore diameter of 0.05 ⁇ m or greater; and the maximum pore diameter of 15 ⁇ m or less. Furthermore, the void content of the porous membranes may be 40% or greater, and their mean thickness may be between 1 and 200 ⁇ m. Additionally, the composite membrane may have at least one of the porous membranes comprised of an expanded polytetrafluoroethylene membrane.
  • More embodiments of the instant invention include a composite membrane wherein an air-impermeable layer comprising an ionomeric polymer is interposed between a first and second micro-porous membrane.
  • the air-impermeable layer may comprise a perfluorosulfonic acid polymer.
  • at least one of the first or second micro-porous membranes may be hydrophobic or hydrophilic.
  • the mean thickness of the air-impermeable layer may be less than 20 um, or less than 6 um.
  • at least part of the impermeable layer may be embedded in the micro-porous membrane, and at least one of the first and second micro-porous layers may comprise expanded polytetrafluoroethylene.
  • the air-impermeable layer may be reinforced, for example with particulates, a micro-porous membrane, or with expanded polytetrafluoroethylene.
  • any of the composite membranes described above may have a gas-permeable reinforcing element layered on at least one of the porous membranes.
  • the gas-permeable reinforcing element may be a woven or a non-woven material comprising a polymer, metal, or ceramic material.
  • any of the composite membranes described above may be used in a moisture adjustment module obtained by superposing any of the composite membranes described herein while open spaces are left therebetween.
  • More embodiments of the invention include methods of preparing a composite membrane comprising the steps of (a) casting a solution comprising a moisture permselective resin on a first micro-porous membrane to form a film on the surface of the micro-porous membrane; (b) stretching a second micro-porous membrane over the film before it is dry to form a composite structure; and (c) drying the composite structure to remove residual liquid the solution.
  • the method may also be performed so that the film is between 0.5 and 10 um thick after step c.
  • an additional step of heat-treating the composite membrane after step (c) may be performed, and the heat treatment may comprise holding the composite membrane at a temperature between 100 and 180 C for a period of time between 1 and 15 minutes.
  • the method include laminating a reinforcing member to at least one side of the composite membrane after step c.
  • the reinforcing member is gas permeable, and may comprise a woven or non-woven material comprising metal, ceramic or polymer.
  • Yet more embodiments include a method of preparing a composite membrane comprising the steps of: (a) preparing a membrane having two sides, the membrane comprising a moisture permselective resin; (b) laminating one side of the membrane to a first micro-porous membrane; and (c) laminating a second micro-porous membrane to the second side of the membrane.
  • lamination may include any combination of heat and/or pressure required to bond two materials together.
  • the first micro-porous membrane and the second micro-porous membrane may comprise expanded polytetrafluoroethylene, or the membrane comprising the moisture permselective resin may further comprises expanded polytetrafluoroethylene, or a perfluorosulfonic acid polymer.
  • a reinforcing member may be laminated to at least one side of the composite membrane after step c.
  • the membrane comprising the moisture permselective resin in step (a) may have a mean thickness of less than 15 ⁇ m, or less than 6 ⁇ m.
  • FIG. 1 is a schematic cross-sectional view showing an example of a conventional composite membrane
  • FIG. 2 is a schematic perspective cross-sectional view showing an example of a moisture adjustment module
  • FIG. 3 is a schematic cross-sectional view showing another example of the conventional composite membrane
  • FIG. 4 is an expanded schematic cross-sectional view of an area of the composite membrane in FIG. 3 ;
  • FIG. 5 is a schematic cross-sectional view showing an example of the composite membrane of the present invention.
  • FIG. 6 is an expanded schematic cross-sectional view of an area of the composite membrane in FIG. 5 ;
  • FIG. 7 is a schematic cross-sectional view showing another example of the composite membrane of the present invention.
  • FIG. 8 is a schematic cross-sectional view showing another example of the composite membrane of the present invention.
  • FIG. 4 is a schematic cross-sectional view showing in enlarged and schematic form areas in which the nonwoven fabric 40 and the porous membrane 20 are joined to each other. As shown in the drawing, the fiber 41 constituting the nonwoven fabric 40 is extremely large in comparison with the surface unevenness (pore diameter) of the porous membrane 20 .
  • the moisture-permeable resin layer 30 is formed by solidifying a liquid moisture-permeable resin 31 .
  • a liquid pool 32 containing the liquid moisture-permeable resin is formed at the border of the fiber 41 of the nonwoven fabric and the porous membrane 20 , and the thickness of the moisture-permeable resin layer 30 becomes non-uniform.
  • the entire moisture-permeable resin layer 30 must be formed thickly in order to prevent pinholes from forming in the thin regions and to secure the desired gas barrier properties, and the moisture permeability is adversely affected.
  • FIG. 6 is a schematic cross-sectional view showing in enlarged and schematic form a joint between the two porous membranes 20 that constitute a pair.
  • the surface of the porous membranes 20 is much smoother than that of the nonwoven fabric 40 . Therefore, liquid pools of the liquid moisture-permeable resin 31 do not form easily and the moisture-permeable resin layer 30 can be formed uniformly.
  • the moisture-permeable resin layer 30 can be formed uniformly, then the moisture-permeable resin layer 30 can be formed thinly without producing pinholes, and better moisture permeability can be obtained without any degradation of the gas barrier properties. Therefore, it was discovered that the balance between the gas barrier properties and moisture permeability could be further improved by forming the moisture-permeable resin layer 30 between the porous membranes 20 that constitute a pair, and the present invention was perfected.
  • Patent Document 3 U.S. Pat. No. 5,418,054 discloses a flame-resistant laminate which is waterproof, has moisture permeability, and includes a first layer of a porous expanded polytetrafluoroethylene membrane, a second layer of a porous expanded polytetrafluoroethylene membrane, and a phosphorus-containing poly(urea/urethane) adhesive layer for bonding the first and second layers together.
  • this laminate is used for protective clothing, and the phosphorus-containing poly(urea/urethane) adhesive layer is not very thin.
  • the adhesive layer when the adhesive layer is made thinner, the adhesive strength between the layers is reduced by a reduction in the amount in which the phosphorus-containing poly(urea/urethane) adhesive is impregnated into the structure of the porous drawn polytetrafluoroethylene membrane, the layers become detached easily when washed or subjected to intense movements of the human body, and the target function cannot be obtained.
  • This is due to the fact that the phosphorus-containing poly(urea/urethane) adhesive and the porous drawn polytetrafluoroethylene membranes are bonded to each other not by chemical bonding but by electrostatic adhesion or the embedding of the adhesive in the porous structure (anchoring effect).
  • the document does not mention the pore diameter of the drawn polytetrafluoroethylene membranes. Normally, the pore diameter of an expanded polytetrafluoroethylene membrane is small in protective clothing.
  • a polymer that is not cross-linked i.e., a non-thermosetting polymer, is not disclosed.
  • a fluororesin layer for example a layer of perfluorosulfonic acid polymer, or any ionomeric polymer between the ePTFE layers was not described. This is an important distinction because the art to date has demonstrated only the use of cross-linked polymers because it has been thought that only such polymers could provide the durability required in applications where high moisture transport rates were required.
  • the composite materials of this invention overcome that limitation by protecting the moisture transport layer with a porous or microporous layer on both sides the moisture transport layer. This significantly widens the choice of moisture-permeable resin layers allowing the use of ionomeric polymers and other non-cross linked polymers.
  • the composite membrane according to present invention has a moisture-permeable resin layer 30 sandwiched between two porous membranes 20 that constitute a pair, and the mean thickness of the moisture-permeable resin layer 30 is 5 ⁇ m or less.
  • the moisture-permeable resin is preferably a water-resistant, moisture-permeable resin.
  • the degree of swelling of the water-resistant, moisture-permeable resin, as calculated based on the change in the volume of the resin before and after the water resistance test described below, is 20 times or less.
  • Water resistance test The resin is allowed to stand for 24 hours in an environment having a temperature of 120° C. and a water vapor pressure of 0.23 MPa, and is subsequently immersed for 15 minutes in water having a temperature of 25° C.
  • the water-resistant, moisture-permeable resin may, for example, be a crosslinked polyvinyl alcohol, an ion-exchange fluororesin, or an ionomeric polymer, or the like.
  • an ionomer polymer is an ion-containing copolymer in which up to 15 mol % of the repeat units contain ionic groups. At least part of the moisture-permeable resin may be embedded in the porous membrane.
  • the porous membrane (expanded polytetrafluoroethylene membrane or the like) has, for example, a mean pore diameter of 0.05 ⁇ m or greater, a maximum pore diameter of 15 ⁇ m or less, a void content of 40% or greater, and a mean thickness of 1 to 200 ⁇ m.
  • a gas-permeable reinforcing element may be layered on at least one of the porous membranes.
  • the present invention includes a moisture adjustment module obtained by superposing the composite membranes while open spaces are left therebetween.
  • Both the moisture permeability and gas barrier properties of the composite membrane 10 according to the present invention can be brought to a higher level because the moisture-permeable resin layer 30 is formed uniformly and thinly. Furthermore, the moisture-permeable resin layer 30 is protected with a porous membrane, and therefore has excellent surface durability when brought into contact with an external object 50 . Furthermore, since the porous membranes 20 are exposed on the surface, the adhesive penetrates into the porous membranes 20 and exhibits an anchoring effect when an external object (especially a spacer) 50 or the like is attached, and the joint strength can be increased.
  • FIG. 5 is schematic cross-sectional view showing an example of the composite membrane 10 of the present invention.
  • a moisture-permeable resin layer 30 is sandwiched between two porous membranes 20 that constitute a pair, as shown in FIG. 5 . Therefore, the moisture-permeable resin layer 30 is protected by the porous membranes 20 and has excellent surface durability when brought into contact with an external object 50 . Furthermore, since the porous membranes 20 are exposed on the surface, the adhesive penetrates into the porous membranes 20 and exhibits an anchoring effect when an external object (especially a spacer) 50 or the like is attached, making it possible to increase the joint strength.
  • the moisture-permeable resin layer 30 can be made thinner without producing pinholes, unlike in the case of Patent Document 2. Both the moisture permeability and gas barrier properties can be brought to a higher level by reducing the thickness of the moisture-permeable resin layer 30 .
  • the composite membrane 10 can be produced, for example, by coating a surface of one of the porous membranes 20 with a liquid that includes a moisture-permeable resin and removing the solvent from the applied liquid after the coated surface is covered with the other porous membrane 20 .
  • the moisture-permeable resin layer 30 may be formed on that surface without being embedded in the porous membranes 20 . However, normally at least part of the moisture-permeable resin layer 30 is embedded in the porous membranes 20 . Durability is improved when the moisture-permeable resin layer 30 is embedded in the porous membranes 20 .
  • a gas-permeable reinforcing element 40 may be layered (bonded) to one of the porous membranes 20 , as shown in FIG. 7 .
  • the composite membrane 10 can be made stronger by the layering of the gas-permeable reinforcing element 40 .
  • the gas-permeable reinforcing element 40 may be layered on both of the porous membranes 20 .
  • the gas-permeable reinforcing element 40 may, for example, be bonded to the porous membranes 20 by heat fusion or the like.
  • the mean thickness of moisture-permeable resin layer 30 is 5 ⁇ m or less, preferably 3 ⁇ m or less, and even more preferably 2 ⁇ m or less.
  • the balance between gas barrier properties and air permeability can be improved by reducing the mean thickness. It is preferable for the mean thickness to be as small as possible so long as pinholes do not occur, and the lowest limit allowed may, for example, be 0.1 ⁇ m or greater (particularly, 0.2 ⁇ m or greater).
  • the mean thickness t of the moisture-permeable resin layer 30 can be calculated according to the following formula by observing a section of the composite membrane 10 with a scanning electron microscope to determine the surface area A of the moisture-permeable resin layer 30 and the length L of the moisture-permeable resin layer 30 .
  • the preferred moisture-permeable resin is a water resistant, moisture-permeable resin having high water resistance.
  • the high water resistance allows durability (resistance to high temperature and humidity) to be improved during service in a hot and humid environment.
  • moisture permeability in a hot and humid environment is improved as well.
  • the water resistance of the water resistant-moisture-permeable resin can be evaluated based on the degree of swelling determined using the water resistance test described below.
  • the degree of swelling of the water resistant moisture-permeable resin is, for example, 20 times or less, preferably 15 times or less, and even more preferably ten times or less.
  • the lower limit of the degree of swelling is not particularly limited and may be two times or greater (particularly five times or greater).
  • Water resistance test The resin is allowed to stand for 24 hours in an environment having a temperature of 120° C. and a water vapor pressure of 0.23 MPa, and is subsequently immersed for 15 minutes in water having a temperature of 25° C.
  • the change in the volume of the resin is measured before and after the test, and the degree of swelling is calculated based on the following formula.
  • the moisture-permeable resin include resins (protic hydrophilic resins) having hydrophilic protic groups in the repeating units thereof, such as polystyrene sulfonic acid, polyvinyl alcohol, vinyl alcohol copolymers (ethylene/vinyl alcohol copolymers, tetrafluoroethylene/vinyl alcohol copolymers), ion-exchange fluororesins (“Nafion (registered trademark)” manufactured by DuPont, “Flemion (registered trademark)” manufactured by Asahi Glass Co., Inc., and the like), divinyl benzene/sulphonic acid copolymers, divinyl benzene/carboxylic acid copolymers, and other an ion-exchange resins; and resins (aprotic hydrophilic resins) having aprotic hydrophilic groups in the repeating units thereof, such as polyethylene oxide, polyvinyl pyridine, polyvinyl ether, polyvinyl
  • the moisture-permeable resin may be formed as a three dimensional crosslinked structure.
  • a three-dimensional crosslinked moisture-permeable resin include crosslinked protonic hydrophilic resin, crosslinked aprotic hydrophilic resins, silicone resins, and the like.
  • a three-dimensional crosslinked moisture-permeable resin has excellent water resistance.
  • the moisture-permeable resin (including the three-dimensional crosslinked moisture-permeable resin) can be used individually or as a combination of two or more resins.
  • a preferred moisture-permeable resin is a crosslinked polyvinyl alcohol (for example, a crosslinked structure based on a mixture of HCl and glutaraldehyde, a crosslinked structure based on formaldehyde, a crosslinked structure based on a blocked isocyanate, or the like) or an ion-exchange fluororesin.
  • a crosslinked polyvinyl alcohol not only has excellent water resistance, but can also be applied readily and can easily produce a thinner moisture-permeable resin layer 30 . Since an ion-exchange fluororesin has excellent heat resistance and chemical resistance, durability is high in a hot and humid environment or a system in which an acid, alkali, or the like is present, and the resin is suitable for use in a severe environment.
  • the moisture-permeable resin layer 30 may also include a humectant.
  • a humectant-containing moisture-permeable resin layer 30 can retain more moisture, and the moisture permeability can be further increased.
  • a water-soluble salt can be used as the humectant. Specifically, a lithium salt, phosphate, or the like can be used.
  • the moisture-permeable resin layer 30 may be reinforced with a thin porous membrane as long as a predetermined mean thickness can be maintained.
  • An example of a composite membrane provided with such a moisture-permeable resin layer is shown in FIG. 8 .
  • FIG. 8( a ) is a schematic cross-sectional view of a moisture-permeable resin layer 35 reinforced with a thin porous membrane 37
  • FIG. 8( b ) is a schematic cross-sectional view of a composite membrane 10 provided with the moisture-permeable resin layer 35 .
  • the composite membrane 10 in FIG. 8 can be produced by impregnating the entire thin porous membranes 37 with a liquid that includes the moisture-permeable resin 36 , then covering both sides of the thin porous membrane 37 with the porous membranes 20 , and subsequently removing the solvent.
  • a membrane similar to the below-described porous membranes 20 can be used as the thin porous membranes 37 within a range in which the mean thickness of the moisture-permeable resin layer 35 can be maintained.
  • the moisture-permeable resin layer 30 is made uniformly thinner by being sandwiched between two porous membranes 20 that constitute a pair.
  • the surface unevenness (pore diameter) of the porous membranes 20 is much smaller in comparison with the fiber diameter of a nonwoven fabric, preventing the liquid moisture-permeable resin from pooling. Therefore a moisture-permeable resin layer can be formed uniformly and thinly.
  • the maximum pore diameter of the porous membranes 20 is, for example, 15 ⁇ m or less, preferably 5 ⁇ m or less, and more preferably 0.5 ⁇ m or less. Making the moisture-permeable resin layer uniform becomes easier with reduced maximum pore diameter.
  • the maximum pore diameter value can be determined using the following formula by calculating the bubble point in accordance with the bubble point method (JIS K3832) using isopropanol.
  • d is the maximum pore diameter
  • ⁇ IPA is the surface tension of isopropanol
  • P B is the bubble point value.
  • the mean pore diameter of the porous membranes 20 is, for example, 0.05 ⁇ m or greater, preferably 0.1 ⁇ m or greater, and more preferably 0.2 ⁇ m or greater.
  • the mean pore diameter is a value determined based on the pore distribution (capacity distribution with respect to the pore diameter). In other words, the pore distribution is measured on the assumption that all the pores of the porous membranes 20 have a cylindrical shape, and the pore diameter corresponding to an intermediate value of the pore capacity is determined as the mean pore diameter. In the present invention, the mean pore diameter was determined using a Coulter Porometer manufactured by Coulter Electronics, Ltd.
  • the void content of the porous membranes 20 can be suitably set in accordance with the pore diameter.
  • the void content is, for example, 40% or greater (preferably 50% or greater).
  • the void content is also, for example, about 98% or less (preferably 90% or less).
  • the densities are determined by calculating the mass W of the porous membranes 20 and the apparent volume V that includes cavities.
  • the thickness during calculation of volume V depends on the mean thickness measured with a dial thickness gauge (measured using “SM-1201” manufactured by Teclock Corporation when the only load applied is the main body spring load).
  • the thickness of porous membranes 20 is not particularly limited and is, for example, 200 ⁇ m or less, preferably 50 ⁇ m or less, and more preferably 40 ⁇ m or less.
  • the moisture transmission rate of the composite membrane 10 deteriorates when the porous membranes 20 are too thick.
  • the heat exchange capacity and separation efficiency decrease when the composite membranes 10 are used as heat exchange membranes or pervaporation membranes.
  • ease of processing is adversely affected when the porous membranes 20 are too thin. Therefore, it is recommended that the thickness of the porous membranes 20 be, for example, 1 ⁇ m or greater, preferably 3 ⁇ m or greater, and more preferably 5 ⁇ m or greater.
  • porous membranes 20 can be used for the porous membranes 20 .
  • examples include polyolefins such as polyethylene, polypropylene, and the like; polycarbonate; polystyrene; polyvinyl chloride; polyvinylidene chloride; polyester; and fluororesins such as polytetrafluoroethylene, tetrafluoroethylene/hexafluoropropylene copolymers, polyvinyl fluoride, polyvinylidene fluoride, and the like.
  • the preferred porous membranes 20 are fluororesin porous membranes. Fluororesins have excellent heat resistance and corrosion resistance. Particularly preferred porous membranes 20 are porous membranes made of expanded polytetrafluoroethylene (PTFE) (hereinafter occasionally referred to as “ePTFE membrane” or “drawn porous PTFE membrane”). Extremely fine pores can be formed in an ePTFE membrane, and the surface smoothness can be increased. Therefore, the moisture-permeable resin layer 30 can easily be formed uniformly and thinly.
  • PTFE expanded polytetrafluoroethylene
  • An ePTFE membrane can be obtained by a method in which a paste obtained by mixing a PTFE fine powder with a molding auxiliary is molded, the molding auxiliary is removed from the resulting molded article, the article is drawn at a high temperature and high speed, and the drawn article is baked as needed.
  • Any process and product known in the art to prepare ePTFE membranes may be used, for example, materials and processes such as those described in U.S. patent Nos. U.S. Pat. No. 3,953,566, U.S. Pat. No. 4,902,423, U.S. Pat. No. 4,985,296, U.S. Pat. No. 5,476,589, U.S. Pat. No. 5,814,405, or U.S. Pat. No.
  • the materials disclosed in Japanese Examined Patent Publication No. S51-18991 are also exemplary.
  • the drawing may be uniaxial or biaxial.
  • a uniaxially drawn porous PTFE is microscopically characterized in that thin island-shaped nodes (folding crystals) are present approximately orthogonal to the drawing direction, and accordion-shaped fibrils (bundles of linear molecules in which the folding crystals are melted and extracted by drawing) linking these nodes are oriented in the drawing direction.
  • a biaxially drawn porous PTFE is microscopically characterized by having a cobweb-shaped fiber structure wherein the fibrils spread radially, and the nodes linking the fibrils are scattered in an island shape to form numerous spaces partitioned into fibrils and nodes.
  • a biaxially drawn porous PTFE can be made wider more easily than a uniaxially drawn porous PTFE, has a better balance of physical properties in the longitudinal and transverse directions, and costs less to produce per unit surface area. A biaxially drawn PTFE is therefore particularly preferred.
  • the gas-permeable reinforcing element 40 is usually formed from a fibrous resin.
  • a reinforcing element 40 having both strength and air permeability can be produced in a simple manner by using a fibrous resin.
  • the gas-permeable reinforcing element 40 formed by a fibrous resin may be any of a woven fabric, a knitted fabric, a nonwoven fabric (nonwoven fabric formed by a manufacturing method such as, for example, the thermal bond method or the spun-bond method), or a net.
  • a particularly preferred gas-permeable reinforcing element 40 is a nonwoven fabric.
  • the composite membrane 10 of the present invention has excellent gas barrier properties and high moisture permeability.
  • the membrane can therefore be appropriately used as a separation membrane to selectively transmit water contained in a gas or liquid (a separation membrane for a moisture adjustment module).
  • a separation membrane for a moisture adjustment module examples include a dehumidification membrane, a moistening membrane, a pervaporation membrane (for example, a membrane for separating water and other liquids (ethanol or another alcohol or the like)), and the like.
  • channels are controlled so that a water-supplying fluid (including a dehydrated fluid) is fed to one surface of the composite membrane 10 , a water-receiving fluid (including a dehydrating fluid) is fed to the other surface of the composite membrane 10 , and the water-supplying fluid and water-receiving fluid do not mix with each other.
  • the preferred moisture adjustment module is a module composed of stacked flat membranes, and the water-supplying fluid and water-receiving fluid flow as countercurrents.
  • the air permeability of the composite membrane 10 is, for example, 5,000 seconds or greater, preferably 8,000 seconds or greater, and more preferably 99,999 seconds or greater using a standard Gurley test. Composite membranes are considered air impermeable within this application if they have a Gurley greater than 5000 s.
  • the moisture permeability of the composite membrane 10 can, for example, be 40 g/m 2 /h or greater, preferably 50 g/m 2 /h or greater, and more preferably 60 g/m 2 /h or greater.
  • the upper limit of moisture permeability is not particularly limited and may, for example, be 150 g/m 2 /h or less (particularly 100 g/m 2 /h or less).
  • Such composite membranes 10 are superposed with each other in the moisture adjustment module, and these superposed composite membranes 10 are spaced apart at predetermined intervals by spacers 50 or the like (for example, cf. FIG. 2 ). Forming gaps on both sides of the composite membranes allows the gaps to be used as fluid channels, and moisture to be adjusted by exchanging moisture between the fluids on both sides.
  • the gas barrier properties and moisture permeability of the composite membrane 10 of the present invention can be improved even under conditions of high temperature and high humidity by using a water-resistant moisture-permeable resin as the moisture-permeable resin. Therefore, the composite membrane can also be used as a separation membrane for selectively transmitting water vapor from a hot and humid gas (for example, as a moistening membrane for using the water vapor included in the effluent gas (especially effluent gas on the side of an air electrode) of a fuel cell electrode in the humidification of the gas fed to a fuel electrode or the air electrode (especially the fuel electrode)).
  • a hot and humid gas for example, as a moistening membrane for using the water vapor included in the effluent gas (especially effluent gas on the side of an air electrode) of a fuel cell electrode in the humidification of the gas fed to a fuel electrode or the air electrode (especially the fuel electrode)).
  • the air permeability of the composite membrane 10 after the membrane was introduced into an autoclave and allowed to stand for 32 hours in an environment having a temperature of 120° C. and a water vapor pressure of 0.23 MPa (2.3 kgf/cm 2 ), may, for example, be 50,000 seconds or greater, preferably 80,000 seconds or greater, and more preferably 99,999 seconds or greater.
  • the moisture permeability of the composite membrane 10 under conditions of high temperature and high humidity is, for example, 200,000 g/m 2 /124 hr or greater, and preferably 250,000 g/m 2 /124 hr or greater.
  • the upper limit of moisture permeability under conditions of high temperature and high humidity is not particularly limited and may, for example, be 400,000 g/m 2 /124 hr or less (particularly 350,000 g/m 2 /24 hr or less).
  • Liquid moisture-permeable resins A and B below were used in the present examples and comparison examples.
  • An aqueous solution containing the following components 1) to 4) was prepared in the following concentrations.
  • a mixture of the following components 1) to 2) was prepared.
  • the ratio (former/latter) of the NCO groups in the polyurethane resin and the OH groups in the ethylene glycol was 1.2/1 (mole ratio).
  • the water resistance of a moisture-permeable resin layer was evaluated as described below.
  • a liquid moisture-permeable resin was applied to a glass substrate and processed under suitable conditions depending on the resin, and a film was obtained.
  • the solution was applied (amount applied: 100 g/m 2 ) and heated at a temperature of 180° C. for one minute.
  • the solution was applied (amount applied: 100 g/m 2 ), dried at a temperature of 100° C. for 5 minutes, and treated with moist heat for 60 minutes at a temperature of 100° C. and a relative humidity of 80% RH.
  • the resulting membrane (test substrate) was placed in an autoclave, allowed to stand for 24 hours in an environment having a temperature of 120° C. and a water vapor pressure of 0.23 MPa (2.3 kgf/cm 2 ), and subsequently immersed for 15 minutes in water having a temperature of 25° C.
  • the degree of swelling was then calculated based on the following formula.
  • Liquid moisture-permeable resin A The degree of swelling was 8 times.
  • Liquid moisture-permeable resin B It was impossible to measure the degree of swelling. Most of the moisture-permeable resin was eluted in water, and the shape of the membrane was unable to be maintained.
  • a composite membrane was obtained by a method in which liquid moisture-permeable resin A was applied (amount applied: 100 g/m 2 ) to one side of an ePTFE membrane (manufactured by Japan Gore-Tex Co., Inc.; mean thickness: 20 ⁇ m, mean pore diameter: 0.2 ⁇ m, maximum pore diameter: 0.4 ⁇ m, and void content of the porous membrane: 85%), an ePTFE membrane (manufactured by Japan Gore-Tex Co., Inc., mean thickness: 20 ⁇ m, mean pore diameter: 0.2 ⁇ m, maximum pore diameter: 0.4 ⁇ m, void content of the porous membrane: 85%) was layered on the coated side, and the membrane was heated for 3 minutes at a temperature of 150° C.
  • thermo-bond nonwoven fabric (9820F (product name) manufactured by Shinwa Corp.) obtained using a polyester fiber (“Melty” (product name), 2.2 dtex, manufactured by Unitika Fibers, Ltd.) was heat-bonded to one surface (top surface, exposed surface) of an ePTFE membrane to form a composite membrane with nonwoven fabric.
  • Example 2 The composite membrane with nonwoven fabric obtained in Example 1 was cut and the structure of the sectional layer was confirmed with a scanning electron microscope (SEM).
  • SEM scanning electron microscope
  • the mean thickness of the moisture-permeable resin layer was 3 ⁇ m. Furthermore, a portion of the moisture-permeable resin layer was embedded in the ePTFE membrane.
  • Example 1 An examination was performed to determine the room-temperature air permeability (using an Oken-type Gurley meter) and room-temperature moisture permeability (method A-1 of JIS L1099) of the composite membrane with nonwoven fabric obtained in Example 1.
  • the air permeability (Gurley number) was 99,999 seconds or greater, and the moisture permeability was 76 g/m 2 /h.
  • the composite membrane with nonwoven fabric according to Example 1 had highly balanced moisture permeability and gas barrier properties.
  • the resistance characteristics exhibited in a hot and humid environment by the composite membrane with nonwoven fabric obtained in Example 1 were examined as follows.
  • the composite membrane with nonwoven fabric was placed in an autoclave and allowed to stand for 24 hours in an environment having a temperature of 120° C. and a water vapor pressure of 0.23 MPa (2.3 kgf/cm 2 ).
  • the membrane was then placed in an autoclave and allowed to stand for 32 hours in an environment having a temperature of 120° C. and a water vapor pressure of 0.23 MPa (2.3 kgf/cm 2 ).
  • These conditions were equal to test conditions in which the membrane was exposed to water vapor for 1,000 hours at temperature of 70° C.
  • the room-temperature air permeability of the membrane was examined after the membrane had been allowed to stand in the conditions described above. As a result, the air permeability (Gurley number) was 99,999 seconds or greater (for both wet and dry) and did not decrease at all.
  • the condition of the composite membrane with nonwoven fabric was visually inspected and no
  • the moisture permeability exhibited in a hot and humid environment (based on method A-1 of JIS L1099, except that the measurement temperature was 60° C. and the holding time was 5 minutes) by the composite membrane nonwoven fabric obtained in Example 1 was examined.
  • the moisture permeability was a high value of 308,540 g/m 2 /124 hr.
  • the surface durability of the composite membrane with nonwoven fabric obtained in Example 1 was examined as follows. A length of 100 mm or greater of adhesive tape having a width of 50 mm or greater (“Neocraft Tape” (product name) manufactured by Lintec Corporation) was attached to both sides of the composite membrane with nonwoven fabric. Subsequently, the adhesive tape that had been attached was peeled off at a speed of 200 mm/min or less, surface properties were confirmed by visual inspection, and air permeability was examined (using an Oken-type Gurley meter). No defects in the surface of the composite membrane with nonwoven fabric could be detected by visual inspection after the tape had been removed. Furthermore, the air permeability (Gurley number) was 99,999 seconds or greater, and the composite membrane with nonwoven fabric of Example 1 showed excellent surface durability.
  • Neocraft Tape product name
  • An ePTFE membrane manufactured by Japan Gore-Tex Co., Inc., mean thickness: 20 ⁇ m, mean pore diameter: 0.2 ⁇ m, maximum pore diameter: 0.4 ⁇ m, void content of the porous membrane: 85%
  • an ion-exchange fluororesin (“Flemion” (product name) manufactured by Asahi Glass Co., Inc.; solids content: 17%; ethanol solvent) and dried, whereby the reinforced moisture-permeable resin layer 35 shown in FIG. 8( a ) was obtained.
  • the reinforced moisture-permeable resin layer was sandwiched on both sides by two ePTFE membranes (manufactured by Japan Gore-Tex Co., Inc., mean thickness: 20 ⁇ m, mean pore diameter: 0.2 ⁇ m, maximum pore diameter: 0.4 ⁇ m, void content of the porous membrane of 85%) and heated at a temperature of 160° C. for three minutes while a load of 500 kPa was applied to obtain a composite membrane.
  • ePTFE membranes manufactured by Japan Gore-Tex Co., Inc., mean thickness: 20 ⁇ m, mean pore diameter: 0.2 ⁇ m, maximum pore diameter: 0.4 ⁇ m, void content of the porous membrane of 85%
  • thermal-bond nonwoven fabric (9820F (product name) manufactured by Shinwa Corp.) obtained using a polyester fiber (“Melty” (product name), 2.2 dtex, manufactured by Unitika Fibers, Ltd.) was fusion-bonded to the surface (top surface, exposed surface) of the ePTFE membrane to form a composite membrane with nonwoven fabric.
  • the composite membrane with nonwoven fabric obtained in Example 2 was cut and the structure of the sectional layer was confirmed with a scanning electron microscope (SEM).
  • the mean thickness of the moisture-permeable resin layer was 5 ⁇ m.
  • Example 2 An examination was conducted to determine the room-temperature air permeability (using an Oken-type Gurley meter) and room-temperature moisture permeability (method A-1 of JIS L1099) of the composite membrane with nonwoven fabric obtained in Example 2.
  • the air permeability (Gurley number) was 99,999 seconds or greater, and the moisture permeability was 120 g/m 2 /h.
  • Example 2 The resistance characteristics exhibited in a hot and humid environment by the composite membrane with nonwoven fabric obtained in Example 2 were examined in the same manner as in Example 1.
  • the air permeability (Gurley number) was 99,999 seconds or greater (for both wet and dry), and did not decrease at all.
  • the condition of the composite membrane nonwoven fabric was visually inspected and no abnormalities were noted.
  • a thermal-bond nonwoven fabric (9820F (product name) manufactured by Shinwa Corp.) obtained using a polyester fiber (“Melty” (product name), manufactured by Unitika Fibers, Ltd., the physical properties were the same as those previously described) was fusion-bonded to one side of an ePTFE membrane (manufactured by Japan Gore-Tex Co., Inc., mean thickness: 20 ⁇ m, mean pore diameter: 0.2 ⁇ m, maximum pore diameter: 0.4 ⁇ m, void content of the porous membrane: 85%).
  • Liquid moisture-permeable resin A was applied (amount applied: 230 g/m 2 ) from the nonwoven fabric side and then heated for 3 minutes at temperature of 150° C. to obtain the composite membrane.
  • the composite membrane obtained in comparison example 1 was cut and the structure of the sectional layer was confirmed with a scanning electron microscope (SEM).
  • SEM scanning electron microscope
  • the resistance characteristics exhibited in a hot and humid environment by the composite membrane of comparison example 1 were examined in the same manner as in Example 1.
  • the air permeability of the composite membrane according to comparison example 1 (Gurley number) was 23,600 seconds, the moisture permeability was 35.7 g/m 2 /h, and both the gas barrier properties and the moisture permeability were inadequate.
  • Liquid moisture-permeable resin A was applied (amount applied: 100 g/m 2 ) to one side of an ePTFE membrane (manufactured by Japan Gore-Tex Co., Inc., mean thickness: 20 ⁇ m, mean pore diameter: 0.2 ⁇ m, maximum pore diameter: 0.4 ⁇ m, void content of the porous membrane: 85%) and dried for one minute at a temperature of 180° C.
  • an ePTFE membrane manufactured by Japan Gore-Tex Co., Inc., mean thickness: 20 ⁇ m, mean pore diameter: 0.2 ⁇ m, maximum pore diameter: 0.4 ⁇ m, void content of the porous membrane: 85%
  • a thermal-bond nonwoven fabric (9820F (product name) manufactured by Shinwa Corp.) obtained using a polyester fiber (“Melty” (product name), manufactured by Unitika Fibers, Ltd., the physical properties were the same as those previously described) was fusion-bonded to the exposed side of the ePTFE membrane to obtain a composite membrane.
  • the surface durability of the composite membrane of Comparison Example 2 was examined in the same manner as in Example 1.
  • the resin layer was observed to have peeled on the side of the moisture-permeable resin layer in the composite membrane following tape removal. Furthermore, the air permeability (Gurley number) was 20 seconds and the surface durability of the composite membrane of comparison example 2 was inadequate.
  • a composite membrane was obtained by applying (amount applied: 100 g/m 2 ) liquid moisture-permeable resin B to one side of the ePTFE membrane (manufactured by Japan Gore Tex Co., Inc., mean thickness: 20 ⁇ m, mean pore diameter: 0.2 ⁇ m, maximum pore diameter: 0.4 ⁇ m, void content of the porous membrane: 85%), drying the membrane for 5 minutes at a temperature of 100° C., and treating the membrane with moist heat for 60 minutes at a temperature of 100° C. and a relative humidity of 80% RH.
  • the resistance characteristics exhibited in a hot and humid environment by the composite membrane were examined in the same manner as in reference example 1.
  • the air permeability (Gurley number) after testing was 99,999 seconds or greater.
  • the surface of the moisture-permeable resin layer was extremely sticky.
  • Example 2 Furthermore, the moisture permeability exhibited by the composite membrane of reference example 1 in a hot and humid environment was examined in the same manner as in Example 1. The moisture permeability was 198,920 g/m 2 /24 hr and had decreased below that of Example 1.
  • PFSA perfluorosulfonic acid
  • PET polyethylene terephthalate
  • ETFE ethylene tetrafluoroethylene
  • This film was laminated to an ⁇ 15 cm ⁇ ⁇ 15 cm micro-porous ePTFE membrane prepared according to the teachings of U.S. Pat. No. 5,814,405.
  • the ePTFE membrane had a thickness of about 25 um, a Gurley of about 8.5, a mass per unit area of about 7.5 g/m 2 , a longitudinal matrix tensile strength of 267 Mpa (38,725 psi), a transverse matrix tensile strength of about 282 Mpa (40,900 psi) and an aspect ratio of about 29.
  • the lamination was accomplished at 160 C for 3 minutes using a PHI Inc. Model B-257H-3-MI-X20 hydraulic press with heated platens.
  • GR® sheet available from W. L. Gore & Associates, Inc, Elkton, Md.
  • GR® sheet available from W. L. Gore & Associates, Inc, Elkton, Md.
  • no pressure was applied in the press.
  • the product was turned over and laminated under the same conditions to a second sheet of ePTFE of the same composition to form the inventive air-impermeable composite membrane.
  • the moisture vapor transport rate (MVTR) was measured using a cell and general approach similar to that described by Gibson [in “Effect of temperature on water vapor transport through polymer membrane laminates” published in Polymer Testing , Volume 19, Number 6, pages 673-691].
  • wet gas with a known fixed water concentration is passed over one side of a membrane, and dry gas with a known fixed water concentration is passed over the other side.
  • the MVTR is measured from either the measured loss of water between the inlet and outlet of the wet side, or the gain in water between the inlet and outlet on the dry side of the cell.
  • Water concentrations in our cell are measured using Vaisala humidity probes (Vaisala Industrial Instruments, Woburn, Mass.), and all inlet and outlet lines are heated to at or slightly above the dew point of the gases to prevent condensation. Humidities and flows are set using a GlobeTech Inc. fuel cell test stand as controlled by Scribner and Associates control software.
  • the MVTR was calculated as described by Gibson using the data from the change in water concentration on the dry side.
  • the dry side data was used in preference to the wet side data because it had a larger signal to noise ratio (i.e., a larger change in the measured RH between inlet and outlet).
  • the active sample area for our test apparatus is 3 cm ⁇ 3.5 cm or 10.5 cm 2 .
  • Example 4 was prepared identically to Example 3 except that the lamination was performed at 160 degrees C. for 3 minutes under 15 tons of force.
  • the MVTR was 1.5 times that of Comparison Example 4.
  • An inventive air-impermeable composite membrane was prepared as follows: a PFSA polymer solution was prepared as described in Paragraphs [113]-[114] of U.S. Patent Application 2007/0072036 except the reactants were adjusted during polymerization to produce a product with an equivalent weight of about 800. The solution was coated using a #20 Meyer Bar an ETFE treated PET film that was stretched tight over a glass plate. An ePTFE membrane as described in Example 3 was then stretched over the wet coating. Then, the resulting material was dried for 20-60 s with a hair drier and then heat-treated at 160 C for three minutes.
  • the ePTFE/PFSA film was removed from the backer and stretched over a second layer of the same ePTFE membrane described in Example 1 held tight on a glass dish so the PFSA was in contact with the second layer of ePTFE.
  • This material was heat treated in a 160° C. air furnace for three minutes and then removed to cool.
  • the moisture permselective composite was removed from the glass dish and tested for MVTR as described in Example 1. The results (Table 1) show The MVTR was about three times that of Comparison Example 4.
  • An inventive moisture permselective composite was prepared with particulate reinforcement in the PFSA layer as follows: a platinum/C particulate solution was prepared essentially as described in Paragraphs [118] of U.S. Patent Application No. 2007/0072036. Three grams of this solution was mixed with 20 grams of the PFSA solution used in Example 5 plus five grams of deionized water. This solution was cast using a 6 mil drawdown bar onto the ePTFE as described in Example 3 that was stretched over an ETFE coated PET backer. A second ePTFE membrane of the same composition was stretched over the wet film. The resulting composite was dried, then annealed in a 160° C. air furnace for three minutes and then removed to cool. The water permselectivity, tested as described in Example 1, showed the MVTR was about 3.4 times that of Comparison Example 4.
  • An inventive moisture permselective composite was prepared to demonstrate that alternate PFSA compositions may be used to produce high water transport rate materials.
  • a moisture permselective composite was prepared us ing the same procedure as described in Example 5 except the PFSA was prepared essentially as described in Paragraph [116] of U.S. Patent Application No. 2007/0072036. The difference between this Example and Example 5 is that the PFSA was different, primarily in that in this example the equivalent weight of the PFSA was about 920 versus the 800 equivalent weight of Example 5.
  • the water permselectivity, tested as described in Example 1, showed the MVTR of the material of Example 7 was about 2.8 times that of Comparison Example 4.
  • a moisture permselective composite was prepared to demonstrate that the micro-porous membrane of the inventive composite may be hydrophilic.
  • a composite was prepared using the same materials and procedures as Example 5 except the second ePTFE layer was a water-wettable ePTFE membrane obtained Japan-Gore-Tex, Inc, Okayama, Japan (product number HSMO 71010). This product is pre-treated with a thin polyvinyl alcohol (PVA) coating on the nodes and fibrils of the ePTFE in order to render it hydrophilic while still maintaining a micro-porous air permeable structure.
  • PVA polyvinyl alcohol
  • This inventive composite had an MVTR (Table 1) of about 2.9 times that of Comparison Example 4.
  • a moisture permselective composite was prepared to demonstrate that the porous membranes that constitute a pair need not be identical.
  • a composite was prepared using the same materials and procedures as Example 5 except the second ePTFE layer was an ePTFE membrane made using the teachings of U.S. Pat. No. 3,953,566 to Gore with a mass per area of 7.0 g/m 2 , a thickness of 20 microns, and porosity of at least 85%, and a longitudinal matrix tensile strength of about 67 MPa, and a transverse matrix tensile strength of about 76 MPa.
  • This inventive composite had an MVTR (Table 1) of about 2.32 times that of Comparison Example 4.
  • An inventive moisture perm selective composite was prepared using the same PFSA polymer as Example 5 and the same procedure as Example 6. Here, the solution concentrations were adjusted by adding water so the solids content was ⁇ 15%, and the water content was about 50%, the balance ethanol. A moisture permselective composite was then prepared as described in Example 6 using the solution and coating with a #20 Meyer bar. The water permselectivity, tested as described in Example 1, showed the MVTR was about 2.4 times that of Comparison Example 4.
  • Example 2 illustrates the inventive composite with a non-woven gas-permeable reinforcing element attached to one side
  • this example illustrates the inventive composite with a woven polymer attached to both sides of an inventive composite.
  • a woven carbon filled polyvinylidene fluoride (PVDF) with a fiber diameter of ⁇ 140 ⁇ m (5.5 mils) and 17 ⁇ 21 picks/inch (inLightenTM window screen) was obtained from W. L. Gore and Associates Elkton, Md. Two pieces of ⁇ 14 cm ⁇ 14 cm pieces of this screen were placed on either side of a slightly larger piece of the inventive composite of Example 6.
  • a piece of 0.25′′ thick GR® sheet available from W. L.
  • a composite was prepared using the same procedure as Example 10, except a #9 Meyer bar was used for casting in the first step.
  • the resulting composite was ⁇ 20 ⁇ m thick.
  • the air permeability of this sample was measured and found to have a Gurley of >10,000 s.
  • a composite moisture permselective composite was prepared with a micro-porous reinforcement in the ionomeric polymer layer as follows:
  • a micro-porous ePTFE membrane was prepared according to the teachings of Bacino, et. al. in U.S. Pat. No. 7,306,729. This material had properties similar to Example 5 in '729 with a Gurly of about 7 s and a mass area of 2.4 g/m 2 .
  • a membrane was prepared using this ePTFE using the following process: the PFSA described in Example 5 was coated onto an ETFE treated PET film stretched over a glass plate using a #9 Meyer bar. The ePTFE membrane was then stretched over the wet coating and allowed to infiltrate.
  • a NAFION® membrane about 28 ⁇ m was prepared by casting a commercial 5% solution of 1100 equivalent weight NAFION® product (available from Ion Power, Inc., New Castle, Del.) on an ETFE coated PET backer and then drying, followed by annealing at 160° C. for 3 minute.
  • the MVTR (Table 1) is dramatically lower than the inventive materials of Examples 3-10.
US12/239,037 2008-06-25 2008-09-26 Composite Membrane and Moisture Adjustment Module Using Same Abandoned US20090324929A1 (en)

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JP2011516321A JP2011525857A (ja) 2008-06-25 2009-06-25 複合膜及びそれを用いた水分量調整モジュール
EP09770568.5A EP2323753B8 (en) 2008-06-25 2009-06-25 Moisture adjustment module using composite membrane
CA2728518A CA2728518A1 (en) 2008-06-25 2009-06-25 Composite membrane and moisture adjustment module using same
CN200980124878.3A CN102076401B (zh) 2008-06-25 2009-06-25 复合膜和使用该复合膜的湿度调节模块
KR1020117001741A KR101701521B1 (ko) 2008-06-25 2009-06-25 복합체 막 및 이를 사용한 수분 조절 모듈
PCT/US2009/003832 WO2009158030A1 (en) 2008-06-25 2009-06-25 Composite membrane and moisture adjustment module using the same
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EP2323753A1 (en) 2011-05-25
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US9853305B2 (en) 2017-12-26
US20150311546A1 (en) 2015-10-29
EP2323753B8 (en) 2018-11-28
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KR101701521B1 (ko) 2017-02-01
JP5156504B2 (ja) 2013-03-06

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