Abstract: A nanoweb of polymeric nanofibers in which all of the polymeric fibers have a mean curl index when measured over any 100 micron long segment of less than 0.10 and the nanoweb has a uniformity index of less than 5.0. The nanoweb may have a fiber orientation index of between 0.8 and 1.2 or a mean flow pore size minus the mode of the pore size is less than 1.0 and simultaneously the ratio of the 99% width of the pore size distribution (W) to the width at half height of the pore size distribution (HM0) is less than 10.0.

Abstract: A composite wind barrier fabric having the ability to maintain a high MVTR while controlling air permeability. The fabric has a nanofiber layer optionally welded to, and in a face-to-face relationship with, a fabric layer. Optionally a second fabric layer is welded adjacent to and in a face-to-face relationship with the nanofiber layer and on the opposite side of the nanofiber layer to the first fabric layer. The fabric has a Frazier air permeability of between about 1.2 m3/m2/min and about 7.6 m3/m2/min, and an MVTR per ASTM E-96B method of greater than about 500 g/m2/day. The nanofiber layer is dyed over at least a portion or all of its surface or both.

Abstract: Porous fibrous sheets are provided that are useful in end uses requiring microbial barrier properties such as medical packaging and medical gowns and drapes. The porous fibrous sheets may contain nanofibers and wood pulp.

Abstract: A filter medium containing a nonwoven nanoweb made of aromatic polymer fibers, wherein the nanoweb has a porosity of 85% or greater, a basis weight of 5 grams per square meter or greater, a mean pore size of 0.1 to 10 ?m and a uniformity index of between 1.5 and 2.5.

Abstract: An article of apparel having the ability to maintain a high MVTR while protecting the wearer from wind. The garment has a nanofiber layer bonded to, and in a face-to-face relationship with a fabric outer layer. Optionally a second fabric layer is bonded adjacent to and in a face-to-face relationship with the nanofiber layer and on the opposite side of the nanofiber layer from the first fabric layer. The fabric has a Frazier air permeability of no greater than about 7.6 m3/m2/min, and an MVTR of greater than about 500 g/m2/day.

Abstract: A composite wind barrier fabric having the ability to maintain a high MVTR while controlling air permeability. The fabric has a nanofiber layer optionally welded to, and in a face-to-face relationship with, a fabric layer. Optionally a second fabric layer is welded adjacent to and in a face-to-face relationship with the nanofiber layer and on the opposite side of the nanofiber layer to the first fabric layer. The fabric has a Frazier air permeability of between about 1.2 m3/m2/min and about 7.6 m3/m2/min, and an MVTR per ASTM E-96B method of greater than about 500 g/m2/day. The nanofiber layer is dyed over at least a portion or all of its surface or both.

Abstract: A water resistant garment having regions of high MVTR while maintaining water resistance. The garment has a nanofiber layer bonded to, and in a face-to-face relationship with, a fabric layer. Optionally a second fabric layer is bonded adjacent to and in a face-to-face relationship with the nanofiber layer and on the opposite side of the nanofiber layer to the first fabric layer. The garment has regions having a Frazier air permeability of no greater than about 25 cfm/ft2, an MVTR per ASTM E-96B method of greater than about 500 g/m2/day and a hydrohead of at least about 50 cmwc.

Abstract: A process for producing plexifilamentary or foam products by flash spinning in selected spin agents a polymer from the group consisting of poly (1,3-propylene terephthalate), poly (1,4-butylene terephthalate), and poly(ethylene terephthalate), including their copolymers in which the spin agents have minimal or no ozone-depleting properties.

Abstract: A process for producing plexifilamentary or foam products by flash spinning in selected spin agents a polymer from the group consisting of poly (1,3-propylene terephthalate), poly (1,4-butylene terephthalate), and poly(ethylene terephthalate), including their copolymers in which the spin agents have minimal or no ozone-depleting properties.

Abstract: A process for producing plexifilamentary or foam products by flash spinning in selected spin agents a polymer from the group consisting of poly (1,3-propylene terephthalate), poly (1,4-butylene terephthalate), and poly(ethylene terephthalate), including their copolymers in which the spin agents have minimal or no ozone-depleting properties.

Abstract: A process for producing plexifilamentary or foam products by flash spinning in selected spin agents a polymer from the group consisting of poly (1,3-propylene terephthalate), poly (1,4-butylene terephthalate), and poly(ethylene terephthalate), including their copolymers in which the spin agents have minimal or no ozone-depleting properties.