Abstract: The present invention provides a multilayer web having at least a first layer and a second layer. The second layer attached to the first layer and the second layer comprising fibers produced from polymeric composition comprising a blend of a thermoplastic polymeric component and a functionalized polymeric component. The functionalized polymeric component is at least 26% by weight of the polymeric components of the second layer. The multilayer web is particularly suited for filtration media.

Abstract: The present invention provides a multilayer web having at least a first layer and a second layer. The second layer attached to the first layer and the second layer comprising fibers produced from polymeric composition comprising a blend of a thermoplastic polymeric component and a functionalized polymeric component. The functionalized polymeric component is at least 26% by weight of the polymeric components of the second layer. The multilayer web is particularly suited for filtration media.

Abstract: A composite polymeric material is provided that may be used to construct an abrasion resistant layer or sheet such as an abrasion resistant meltblown layer. Desirably, the composite polymeric material comprises blends of syndiotactic and isotactic polypropylene with ferroelectric materials. The composite polymeric material is particularly useful for constructing a filter media comprising an abrasion resistant fine fiber layer such as a nonwoven layer. The composite polymeric material of the present invention also allows for electret treatment to improve its filtration characteristics.

Abstract: A composite polymeric material is provided that may be used to construct an abrasion resistant layer or sheet such as an abrasion resistant meltblown layer. Desirably, the composite polymeric material comprises blends of syndiotactic and isotactic polypropylene with ferroelectric materials. The composite polymeric material is particularly useful for constructing a filter media comprising an abrasion resistant fine fiber layer such as a nonwoven layer. The composite polymeric material of the present invention also allows for electret treatment to improve its filtration characteristics.

Abstract: A porous polymeric sheet is provided having an electrostatic charge and comprising a zero-three composite of a polymeric matrix and a ferroelectric material dispersed therein. The polymeric component comprises a non-polar thermoplastic polymer, such as a polyolefin, and a second thermoplastic polymer having polar functional units, such as a telomer. The composite material is formed into a porous sheet and is electrically or corona poled to create an electret material which is well suited four use in various filtration, air-masking and dust wipe applications.

Abstract: A porous polymeric sheet is provided having an electrostatic charge and comprising a zero-three composite of a polymeric matrix and a ferroelectric material dispersed therein. The polymeric component comprises a non-polar thermoplastic polymer, such as a polyolefin, and a second thermoplastic polymer having polar functional units, such as a telomer. The composite material is formed into a porous sheet and is electrically or corona poled to create an electret material which is well suited four use in various filtration, air-masking and dust wipe applications.

Abstract: A porous polymeric sheet is provided having an electrostatic charge and comprising a zero-three composite of a polymeric matrix and a ferroelectric material dispersed therein. The polymeric component comprises a non-polar thermoplastic polymer, such as a polyolefin, and a second thermoplastic polymer having polar functional units, such as a telomer. The composite material is formed into a porous sheet and is electrically or corona poled to create an electret material which is well suited four use in various filtration, air-masking and dust wipe applications.

Abstract: The present invention relates to a composite structure which is capable of use as a filter medium and a method for producing the same. The composite structure contains at least a first nonwoven layer, said first layer having a first surface and a second surface, as well as a rigidifying or stiffening component. The rigidifying component is applied in semi-molten state to the one surface of the nonwoven layer and provides sufficient stiffness and/or resilience to the composite such that the composite is self-pleatable yet retains flexibility. The rigidifying or stiffening component may be filaments of a polymer or polymer blend or alternatively the rigidifying or stiffening component may also be a wax or wax blend.

Abstract: The process of forming an electret nonwoven web, the process including the steps of providing a nonwoven web, generating a DC corona discharge from an apparatus including an anode electrically configured as a parallel device, and subjecting the web to DC corona discharge to form an electret.

Abstract: A durable meltblown filter material is provided comprising a first layer of fine polyester fibers having an average fiber diameter less than 8 micrometers and a second layer of polyester macrofibers having a significant number of fibers in excess of 12 micrometers. The macrofiber layer forms an open structure and the basis weight ratio of fine fiber layer to macrofiber layer can range from 2:1 to 10:1.

Abstract: A filter medium having high stiffness is provided. The filter is a nonwoven web of conjugate fibers which has a Frazier permeability above 200 CFM, an NaCl efficiency above 75 percent, a Gurley Stiffness above 700 mg, and a SEP value of above 80. The conjugate fibers may be polyolefin, more particularly polypropylene and polyethylene in a side-by-side configuration. The medium may be made into a filter by conventional means such as pleating. Such filters are useful in HVAC systems and transportation cabin air filtration.

Abstract: A conjugate multilobal fiber and a fabric made therefrom is provided. The fiber comprises at least two polymers arranged with at least one polymer occupying a portion of the fiber and at least one other polymer having a lower melting point than the first portion polymer occupying an outer portion of the fiber. The polymers can be arranged in a number of configurations depending on the planned use of the web.

Abstract: There is provided a vacuum cleaner filter medium which is a nonwoven spunbond web of conjugate spunbond fibers. The web has a Frazier permeability of at least 250 CFM, an NaCI efficiency of at least 65 percent, a Gurley Stiffness of at least 20 mg, and a pressure drop of 0.5 or less mm H.sub.2 O. The conjugate fibers are made from polymers, more particularly polyolefins, still more particularly polypropylene and polyethylene in a side-by-side configuration. The filter medium is treated by a hot-air knife and through-air bonded during the production process. The medium is also electret treated. The medium has sufficient stiffness to be converted into a filter by conventional techniques. While this invention is directed mainly to air purification and filtration, other gasses may be filtered as well.