162 results about "Moisture vapor transmission rate" patented technology

A breathable composite sheet material, a method for making such a sheet material, and an absorbent article utilizing the sheet material are provided. The composite sheet material is comprised of a thermoplastic film adhered directly to a fibrous substrate. The thermoplastic film comprises at least 50% by weight of a polymer material from the group of block copolyether esters, block copolyether amides and polyurethanes. The substrate comprises a fibrous web of at least 50% by weight of polyolefin polymer synthetic fibers. The composite sheet exhibits a peel strength of at least 0.1 N/cm, a dynamic fluid transmission of less than about 0.75 g/m² when subjected to an impact energy of about 2400 joules/m², and a moisture vapor transmission rate, according to the desiccant method, of at least 1500 g/m²/24 hr. The absorbent article comprises (a) a topsheet; (b) a backsheet; and (c) an absorbent core located between the topsheet and the backsheet; wherein the backsheet comprises the non-porous, substantially fluid impermeable, moisture vapor permeable composite sheet material described above. The composite sheet material is oriented such that the film layer of the composite sheet material faces toward the absorbent core. The absorbent article may comprise a disposable diaper.

A golf ball comprising a core, a barrier layer enveloping the core, and a cover enveloping the barrier layer, wherein the barrier layer has a moisture vapor transmission rate less than that of the cover, and the barrier layer comprises a thermoplastic or thermoset composition of microparticles dispersed in a binder.

A garment (20) for inhibiting relatively moving air from contacting a portion of a person wearing the garment. The garment (20) comprises a first panel (22) for inhibiting relative air movement contact against a portion of the body of the person. The first panel (22) includes a first fabric layer (62), a second fabric layer (64) and a first membrane (66) located between the first and second the first fabric layers. The first membrane (66) is water-resistant. The first panel (22) has an air permeability of not more than 3 CFM/ft2 and a moisture vapor transmission rate of at least 800 gm/m2xday. The garment (20) also comprises a second panel (24) connectable with the first panel (22). The second panel (24) includes a third fabric layer (62a), a fourth fabric layer (64a) and a second membrane (66a) located between the third and fourth fabric layers. The second membrane (66a) is water-resistant. The second panel (24) has an air permeability of at least 6 CFM/f2 and a moisture vapor transmission rate of at least 1000 gm/m2xday.

A wound dressing is provided which is made up of a backing layer, an apertured wound facing layer and an intermediate absorbent layer comprising fibers of material which upon contact with moisture will form a gel. The intermediate layer also includes a non-gel forming component, e.g., another fibrous material which can support the formed gels. The backing layer also has a water transmission rate which is greater than its moisture vapor transmission rate.

The present invention provides an impact resistant sheet material that helps provide exterior walls of a building with resistance to impacts so that the building structure can meet building standards, such as the Miami-Dade County Large Missile Impact Test, for resisting impacts in high wind areas. In one embodiment, sheet material comprises an impact resistant layer that attached to fibrous substrate. The impact resistant layer provides impact resistance to the sheet material so that a wall structure employing the sheet material is able to successfully withstand an impact from a projectile comprising a 9 pound, 7 foot two-by-four (“2×4”) traveling at a speed of at least 34 miles per hour. The impact resistant sheet material may comprise a moisture vapor permeable, water-impermeable barrier layer having a hydrohead of at least 55 cm and a moisture vapor transmission rate of at least 35 g/m²/day. Such a sheet material is particularly useful in barrier applications, such as a house wrap.

The present invention is directed to a multifunctional waterproof/vapor barrier fabric for use in industrial, medical, outdoor apparel (hunting, fishing, skiing, mountaineering, etc.) and military applications. The invention combines functional elements that are especially suited for the above applications. The fabric comprises a lining with wicking and antimicrobial properties, a vapor barrier film or coating with low Moisture Vapor Transmission Rate (M.V.T.R.), and a woven or knit face fabric enhanced with a hydrophobic face coating. The fabric performs admirably in various uses due in part to the use of hydrophobic adhesive, film and coatings, which renders the fabric subject to negligible moisture gain. The durability and water proof properties of the fabric are enhanced due to the impermeable low M.V.T.R design. The fabric of the present invention incorporates a unique combination of properties that addresses issues commonly associated with vapor barrier fabrics. The invention provides a waterproof/barrier fabric that is desirable to wear in direct contact with the skin to prevent evaporative heat loss in cool or cold conditions. The fabric is also effective when worn over one or more layers of other clothing. The fabric is particularly effective because it is capable of use as a base layer and waterproof shell, which helps to minimize the number of layers of clothing needed in cold weather.

A swim diaper for use by a child while swimming, bathing or otherwise exposed to an aqueous environment includes a main torso section formed from a sheet of breathable, waterproof material of sufficient thickness to retain solid waste and having a moisture vapor transmission rate of at least 200 g/m2/day. The main torso section has a torso receiving aperture at the upper end of the main torso section for receiving a torso and leg receiving apertures located in the lower portion of the main torso section for receiving a child's legs.

This invention relates to a hot melt moisture cure polyurethane composition which is the reaction product of a polyether polyol formed from a compound selected from the group consisting of ethylene oxide, propylene oxide, 1,2-butylene oxide, 1,4-butylene oxide and mixtures thereof; a low molecular weight polyalkylene glycol having from 3 to 7 carbon atoms; a crystalline polyester polyol having a melting point from about 40 DEG C. to about 120 DEG C.; and at least one polyfinctional isocyanate component wherein said composition has a moisture vapor transmission rate of greater than about 100 g/m2/day film thickness of from about 450 to about 500 g/m2, and hydrolysis resistance.

A breathable plant container is provided that includes a hollow vessel having an opening through which planting soil can be inserted into the hollow portion of the vessel and through which a plant growing in the soil can grow out of the vessel. The hollow vessel has a wall comprised of a synthetic microporous sheet material selected from the group of flash-spun plexifilamentary fabrics, spunbonded/meltblown/spunbonded (“SMS”) fabrics, and microporous film laminates. The wall of the hollow vessel preferably has an air porosity less than 200 seconds/100 cm³, a moisture vapor transmission rate of at least 300 g/m²/day, and a hydrostatic head of at least 20 cm. The hollow vessel may have a first compartment separated from a second compartment by a synthetic, moisture vapor permeable membrane that resists the passage of water such that water added to the second compartment can keep moist soil added to the first compartment.

A solar panel including a front panel; a photovoltaic material layer deposited either directly on the front panel or directly on an anti-reflective coating formed between the front panel and the photovoltaic material layer; a backing panel; and an adhesive layer disposed between and adhering together the photovoltaic material layer and the backing panel, in which the adhesive layer comprises an adhesive composition, the adhesive composition comprising a low MVTR polymer or copolymer and a silane-modified polymer or copolymer. In another embodiment, the solar panel includes module wire openings which are filled by an adhesive composition comprising a low MVTR polymer or copolymer and a silane-modified polymer or copolymer. A method of making the solar panel is provided.

A carpet pad comprises a two-layer structure of a cushion and a barrier film formed of a synthetic polymeric material free of any fibrous substrate laminated thereto. The barrier film may be directly bonded to the cushion or bonded thereto using a layer of adhesive. The carpet pad is simultaneously impermeable to liquid deposited onto the pad from above the barrier film and permeable to moisture vapor at a moisture vapor transmission rate of at least 14.6 grams per square meter per twenty-four hours (14.6 g/m²/24 hours). The carpet pad is sufficiently durable to maintain liquid impermeability as measured by a Vetterman Drum Wear Test/Staining/Stain Cleaning Test after at least ten thousand cycles or under a pressure of at least eight pounds per square inch (0.56 kg per square meter) as measured by a Modified Mullen Bursting Strength Test.

A substantially liquid impermeable moisture vapor permeable laminate structure comprising: (i) a substrate layer comprising a woven or non-woven material, (ii) a moisture vapor control layer attached to said substrate, (iii) a tie layer comprising one or more copolymers comprising from about 30 to about 90 weight percent ethylene co-monomer units and from about 10 to about 70 weight percent vinyl acetate co-monomer units, and (iv) a layer comprising one or more copolyetherester(s) in an amount of at least 50 weight percent based on the total amount of polymer in the layer. The moisture vapor transmission rate (MVTR) in the direction away from the copolyetherester-containing layer and tie layer and towards the substrate is preferably greater than the MVTR in the direction away from the substrate layer and towards the tie layer and copolyetherester-containing layer.

A moisture vapor permeable, water impermeable composite sheet material is provided which is suitable for use as a housewrap material, and is also useful for other applications such as tarpaulins, or as covers for automobile, boats, patio furniture or the like. The composite sheet material includes a nonwoven substrate and an extrusion-coated polyolefin film layer overlying one surface of the substrate. The nonwoven substrate is comprised of polymeric fibers randomly disposed and bonded to one another to form a high tenacity nonwoven web. The nonwoven substrate has a grab tensile strength of at least 178 Newtons (40 pounds) in at least one of the machine direction (MD) or the cross-machine direction (CD). The extrusion coated polyolefin film layer is intimately bonded to the nonwoven substrate. The film layer has micropores formed therein to impart to the composite sheet material a moisture vapor transmission rate (MVTR) of at least 35 g/m²/24 hr. at 50% relative humidity and 23° C. and a hydrostatic head of at least 55 cm. In one embodiment, the nonwoven substrate comprises a spunbonded nonwoven fabric formed of randomly disposed substantially continuous polypropylene filaments. The spunbonded nonwoven fabric is an area bonded fabric in which the filaments are bonded to one another throughout the fabric at locations where the randomly disposed filaments overlie or cross one another.

A polymer blend comprising high density polyethylene, hydrocarbon resin and nucleating agent; non-oriented film layers and non-oriented films comprising the blend; and packaging articles comprising the non-oriented film are provided. The non-oriented film has normalized moisture vapor transmission rate of no greater than 0.30 g-mil/100 in²/day measured at about 100° F. and 90% external relative humidity. The polymer blend comprises from about 69% by weight to about 90% by weight high density polyethylene, wherein the high density polyethylene has a melt index of at least 1.0 g/10 min and a density greater than 0.958 g/cc; from about 5% by weight to about 30% by weight hydrocarbon resin; and from about 0.01% by weight to about 1% by weight nucleating agent.