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公开(公告)号：EP0902851B1
公开(公告)日：2005-03-16
申请号：EP97926603.8
申请日：1997-05-15
IPC分类号： D01F1/10 , D01F6/04 , D01F6/06 , D01F8/00 , D01F8/06 , D01H1/42 , C08J3/22 , C08K3/00 , H01G7/02 , B01D39/16
CPC分类号： D01F8/06 , B01D39/1623 , C08K3/10 , D01F1/10 , D01F6/04 , D01F6/06 , D01F8/00 , D04H1/4291 , D04H1/4382 , Y10T428/2913 , Y10T428/2927 , Y10T428/2929 , Y10T428/2967 , Y10T442/693 , Y10T442/696
摘要： A fiber which includes a thermoplastic polymer and particles of a ferroelectric material dispersed therein. The thermoplastic polymer may be, for example, a polyolefin, such as polypropylene or polyethylene, and the ferroelectric material may be barium titanate. The ferroelectric material may be present at a level of from about 0.01 to about 50 percent by weight (from about 0.001 to about 13 percent by volume), and will have a longest dimension in a range of from about 10 nanometers to about 10 micrometers. The fiber may be exposed to an electric field. A plurality of the fibers may be employed to form a knitted or woven fabric or a nonwoven web. Also provided is a method of preparing fibers containing particles of a ferroelectric material. The method includes destructuring the ferroelectric material in the presence of a liquid and a surfactant to give destructured particles; the liquid is a solvent for the surfactant and the surfactant is adapted to stabilize the destructured particles against agglomeration. A blend of the stabilized, destructured ferroelectric material particles and a thermoplastic polymer then is formed and extruded to form fibers. The extruded fibers may be collected on a moving foraminous support to form a nonwoven web and, if desired, may be exposed to an electric field. The fiber of the present invention, especially when in the form of a nonwoven web, is especially suited as a filtration medium. For example, the nonwoven web may be adapted to remove particulate matter from a gaseous stream.
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公开(公告)号：EP0902851A1
公开(公告)日：1999-03-24
申请号：EP97926603.0
申请日：1997-05-15
CPC分类号： D01F8/06 , B01D39/1623 , C08K3/10 , D01F1/10 , D01F6/04 , D01F6/06 , D01F8/00 , D04H1/4291 , D04H1/4382 , Y10T428/2913 , Y10T428/2927 , Y10T428/2929 , Y10T428/2967 , Y10T442/693 , Y10T442/696
摘要： A fiber which includes a thermoplastic polymer and particles of a ferroelectric material dispersed therein. The thermoplastic polymer may be, for example, a polyolefin, such as polypropylene or polyethylene, and the ferroelectric material may be barium titanate. The ferroelectric material may be present at a level of from about 0.01 to about 50 percent by weight (from about 0.001 to about 13 percent by volume), and will have a longest dimension in a range of from about 10 nanometers to about 10 micrometers. The fiber may be exposed to an electric field. A plurality of the fibers may be employed to form a knitted or woven fabric or a nonwoven web. Also provided is a method of preparing fibers containing particles of a ferroelectric material. The method includes destructuring the ferroelectric material in the presence of a liquid and a surfactant to give destructured particles; the liquid is a solvent for the surfactant and the surfactant is adapted to stabilize the destructured particles against agglomeration. A blend of the stabilized, destructured ferroelectric material particles and a thermoplastic polymer then is formed and extruded to form fibers. The extruded fibers may be collected on a moving foraminous support to form a nonwoven web and, if desired, may be exposed to an electric field. The fiber of the present invention, especially when in the form of a nonwoven web, is especially suited as a filtration medium. For example, the nonwoven web may be adapted to remove particulate matter from a gaseous stream.
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公开(公告)号：EP1144075B1
公开(公告)日：2011-03-30
申请号：EP99933577.1
申请日：1999-06-25
发明人： MYERS, David, Lewis , TURKEVICH, Leonid, Anthony , LASSIG, John, Joseph , MIDKIFF, David, Grant
IPC分类号： B01D39/00
CPC分类号： B01D39/1623 , B01D39/1692
摘要： A porous polymeric sheet (18) 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 (12) and is electrically or corona poled (26, 30) to create an electret material (18) which is well suited for use in various filtration, air-masking and dust wipe applications.
摘要翻译： 提供具有静电电荷并且包含分散在其中的聚合物基质和铁电体材料的零三分复合物的多孔聚合物片材。 聚合物组分包括非极性热塑性聚合物，例如聚烯烃，和具有极性官能单元的第二热塑性聚合物，例如调聚物。 复合材料被形成为多孔片材并且被电或电晕极化以产生非常适合用于各种过滤，空气掩蔽和防尘擦拭应用的驻极体材料。
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公开(公告)号：EP0942943B1
公开(公告)日：2007-04-04
申请号：EP97951568.1
申请日：1997-12-05
CPC分类号： C08J3/2056 , C08J3/226 , C08J2391/00 , C08J2491/00
摘要： A method of preparing a dispersion of small particles in a polymeric precursor, which method involves providing a mixture of a particulate material and a surfactant in a nonaqueous solvent, forming a dispersion of the particulate material in the nonaqueous solvent, combining the resulting dispersion of particulate material in the nonaqueous solvent with a precursor material, and heating the combination of the dispersion of particulate material and the precursor material, with mixing, to a temperature sufficient to volatilize the nonaqueous solvent. The surfactant is soluble in the nonaqueous solvent and is adapted to stabilize the particulate material against agglomeration. The nonaqueous solvent swells the polymeric precursor near the boiling point of the nonaqueous solvent. The boiling point of the nonaqueous solvent is greater than a temperature at which the polymeric precursor may be mixed and below a temperature at which the polymeric precursor polymerizes or decomposes. In certain embodiments, the particulate material isan inorganic material. For example, the inorganic material may be a ferroelectric material, such as barium titanate and lead titanate. In other embodiments, the particulate material is a ferromagnetic material, such as magnetite and barium ferrite.
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公开(公告)号：EP1144075A3
公开(公告)日：2002-09-11
申请号：EP99933577.1
申请日：1999-06-25
发明人： MYERS, David, Lewis , TURKEVICH, Leonid, Anthony , LASSIG, John, Joseph , MIDKIFF, David, Grant
IPC分类号： B01D39/00
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公开(公告)号：EP1144075A2
公开(公告)日：2001-10-17
申请号：EP99933577.1
申请日：1999-06-25
发明人： MYERS, David, Lewis , TURKEVICH, Leonid, Anthony , LASSIG, John, Joseph , MIDKIFF, David, Grant
IPC分类号： B01D39/00
CPC分类号： B01D39/1623 , B01D39/1692
摘要： A porous polymeric sheet (18) 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 (12) and is electrically or corona poled (26, 30) to create an electret material (18) which is well suited for use in various filtration, air-masking and dust wipe applications.
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