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公开(公告)号：US4906377A
公开(公告)日：1990-03-06
申请号：US346976
申请日：1989-05-03
申请人： Larry Y. Yen , George Lopatin
发明人： Larry Y. Yen , George Lopatin
CPC分类号： D01D5/24 , B01D67/003 , B01D67/0083 , B01D67/0095 , B01D71/36 , C08J9/28 , B01D2323/08 , C08J2327/12
摘要： Microporous poly (tetrafluoroethylene-co-perfluoro (alkyl vinyl ether)) (PFA) or poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) membrane or hollow fibers are formed from a melt blend of 10 to 35 weight percent of PFA or FEP and a chlorotrifluoroethylene oligomer solvent. The melt blend is shaped and cooled to effect phase separation of the PFA or FEP from the blend. The solvent is removed from the PFA or FEP by extraction and the porous PFA or FEP is dried under restraint to prevent shrinkage.
摘要翻译： 微孔聚（四氟乙烯 - 全氟（烷基乙烯基醚））（PFA）或聚（四氟乙烯 - 共 - 六氟丙烯）（FEP）膜或中空纤维由10至35重量％的PFA或FEP的熔融共混物形成， 一氯三氟乙烯低聚物溶剂。 将熔融共混物成型并冷却以实现PFA或FEP与共混物的相分离。 通过萃取将溶剂从PFA或FEP中除去，并将多孔PFA或FEP在约束条件下干燥以防止收缩。
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公开(公告)号：US4778601A
公开(公告)日：1988-10-18
申请号：US658600
申请日：1984-10-09
申请人： George Lopatin , Larry Y. Yen
发明人： George Lopatin , Larry Y. Yen
CPC分类号： C08J9/28 , B01D67/003 , B01D67/0095 , B01D71/26 , B01D2323/12 , B01D2323/18 , B01D2325/30 , C08J2201/03 , C08J2201/052 , C08J2201/0543 , C08J2201/0546 , C08J2323/06
摘要： Microporous membranes and methods for producing such membranes from ultrahigh molecular weight polyethylene are described. The method employs extrusion of a solution of UHMW-PE and porogen through a forming die followed by thermal phase separation of polymer and porogen. Microporous structures are created by removing porogen. Microporous membranes produced include membranes with good permeability to air and water making them particularly useful as filtration media and water-resistant breathable membranes.
摘要翻译： 描述了微孔膜和从超高分子量聚乙烯生产这种膜的方法。 该方法通过成形模挤出UHMW-PE和致孔剂溶液，然后热分解聚合物和致孔剂。 通过去除致孔剂产生微孔结构。 产生的微孔膜包括对空气和水具有良好渗透性的膜，使得它们特别用作过滤介质和防水透气膜。
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公开(公告)号：US5032274A
公开(公告)日：1991-07-16
申请号：US569060
申请日：1990-08-17
申请人： Larry Y. Yen , George Lopatin , Howard Malarkey , David Soane
发明人： Larry Y. Yen , George Lopatin , Howard Malarkey , David Soane
CPC分类号： D01D5/24 , B01D67/0027 , B01D67/003 , B01D71/36 , C08J9/28 , B01D2323/12 , C08J2327/12
摘要： Microporous or open ultrafiltration poly (tetrafluoroethylene-co-perfluoro-(alkyl vinyl ether)) (PFA) or poly (tetrafluoroethylene-co-hexafluoropropylene) (FEP) film membrane or hollow fibers having open pores are formed from a melt blend of 10 to 35 weight percent of the PFA or FEP and a chlorotrifluoroethylene oligomer solvent. The melt blend is shaped and one or more surfaces of the shaped melt blend are coated with the solvent prior to phase separation of the melt blend. Coating the membrane with solvent during shaping results in membrane having larger pores on that membrane surface as compared to membranes not coated with solvent. The shaped melt blend is cooled to effect phase separation and crystallization of the PFA or FEP from the blend. The solvent is separated from the PFA or FEP by extraction and the porous PFA or FEP is heat set under restraint to prevent shrinkage. In one embodiment of this invention the dry film membrane recovered after extraction or the membrane wet with extraction liquid is stretched in the cross-web direction to below its breaking limit, dried restrained and then heat-set.
摘要翻译： 微孔或开放超滤聚（四氟乙烯 - 全氟 - （烷基乙烯基醚））（PFA）或聚（四氟乙烯 - 共 - 六氟丙烯）（FEP）膜或具有开孔的中空纤维由10至 35重量％的PFA或FEP和一氯三氟乙烯低聚物溶剂。 在熔体共混物的相分离之前，将熔融共混物成形，并将成形熔体共混物的一个或多个表面用溶剂涂布。 在成膜过程中用溶剂涂覆膜会导致与没有涂覆溶剂的膜相比，在膜表面具有较大孔的膜。 将成形的熔融共混物冷却以实现PFA或FEP从共混物中的相分离和结晶。 通过提取将溶剂与PFA或FEP分离，并且多孔PFA或FEP在约束下热定型以防止收缩。 在本发明的一个实施方案中，将提取后回收的干膜膜或用提取液润湿的膜在横幅方向拉伸至低于其断裂极限，干燥抑制然后热定形。
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公开(公告)号：US4828772A
公开(公告)日：1989-05-09
申请号：US192595
申请日：1988-05-09
申请人： George Lopatin , Larry Y. Yen
发明人： George Lopatin , Larry Y. Yen
CPC分类号： C08J9/28 , B01D67/003 , B01D71/26 , C08J2201/03 , C08J2201/052 , C08J2201/0543 , C08J2201/0546 , C08J2323/06 , Y10S264/48 , Y10S264/62
摘要： Microporous membranes and methods for producing such membranes from ultrahigh molecular weight polyethylene are described. The method employs extrusion of a solution of UHMW-PE and porogen through a forming die followed by thermal phase separation of polymer and porogen. Microporous structures are created by removing porogen. Microporous membranes produced include membranes with good permeability to air and water making them particularly useful as filtration media and water-resistance breathable membranes.
摘要翻译： 描述了微孔膜和从超高分子量聚乙烯生产这种膜的方法。 该方法通过成形模挤出UHMW-PE和致孔剂溶液，然后热分解聚合物和致孔剂。 通过去除致孔剂产生微孔结构。 产生的微孔膜包括对空气和水具有良好渗透性的膜，使得它们特别用作过滤介质和耐水透气膜。
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公开(公告)号：US4990294A
公开(公告)日：1991-02-05
申请号：US412959
申请日：1989-09-26
申请人： Larry Y. Yen , George Lopatin , Howard Malarkey , David Soane
发明人： Larry Y. Yen , George Lopatin , Howard Malarkey , David Soane
CPC分类号： D01D5/24 , B01D67/0027 , B01D67/003 , B01D67/0083 , B01D67/0095 , B01D71/36 , C08J9/28 , B01D2323/08 , B01D2325/022 , C08J2327/12
摘要： Microporous or open ultrafiltration poly (tetrafluoroethylene-co-perfluoro-(alkyl vinyl ether)) (PFA) or poly (tetrafluoroethylene-co-hexafluoropropylene) (FEP) film membrane or hollow fibers having open pores are formed from a melt blend of 10 to 35 weight percent of the PFA or FEP and a chlorotrifluoroethylene oligomer solvent. The melt blend is shaped and one or more surfaces of the shaped melt blend are coated with the solvent prior to phase separation of the melt blend. Coating the membrane with solvent during shaping results in membrane having larger pores on that membrane surface as compared to membranes not coated with solvent. The shaped melt blend is cooled to effect phase separation and crystallization of the PFA or FEP from the blend. The solvent is separated from the PFA or FEP by extraction and the porous PFA or FEP is heat set under restraint to prevent shrinkage. In one embodiment of this invention the dry film membrane recovered after extraction or the membrane wet with extraction liquid is stretched in the cross-web direction to below its breaking limit, dried, restrained and then heat-set.
摘要翻译： 微孔或开放超滤聚（四氟乙烯 - 全氟 - （烷基乙烯基醚））（PFA）或聚（四氟乙烯 - 共 - 六氟丙烯）（FEP）膜或具有开孔的中空纤维由10至 35重量％的PFA或FEP和一氯三氟乙烯低聚物溶剂。 在熔体共混物的相分离之前，将熔融共混物成形，并将成形熔体共混物的一个或多个表面用溶剂涂布。 在成膜过程中用溶剂涂覆膜会导致与没有涂覆溶剂的膜相比，在膜表面具有较大孔的膜。 将成形的熔融共混物冷却以实现PFA或FEP从共混物中的相分离和结晶。 通过提取将溶剂与PFA或FEP分离，并且多孔PFA或FEP在约束下热定型以防止收缩。 在本发明的一个实施方案中，提取后回收的干膜膜或用提取液润湿的膜在横幅方向拉伸至破坏极限以下，干燥，抑制然后热定型。
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公开(公告)号：US4902456A
公开(公告)日：1990-02-20
申请号：US190285
申请日：1988-05-04
申请人： Larry Y. Yen , George Lopatin
发明人： Larry Y. Yen , George Lopatin
CPC分类号： B01D67/003 , B01D67/0083 , B01D67/0095 , B01D71/36 , C08J9/28 , D01D5/24 , B01D2323/08 , C08J2327/12
摘要： Microporous poly (tetrafluoroethylene-co-perfluoro (alkyl vinyl ether)) (PFA) or poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) membrane or hollow fibers are formed from a melt blend of 10 to 35 weight percent of PFA or FEP and a chlorotrifluoroethylene oligomer solvent. The melt blend is shaped and cooled to effect phase separation of the PFA or FEP from the blend. The solvent is removed from the PFA or FEP by extraction and the porous PFA or FEP is dried under restraint to prevent shrinkage.
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公开(公告)号：US4874567A
公开(公告)日：1989-10-17
申请号：US42138
申请日：1987-04-24
申请人： George Lopatin , Larry Y. Yen , Randall R. Rogers
发明人： George Lopatin , Larry Y. Yen , Randall R. Rogers
IPC分类号： B32B5/24 , B01D67/00 , B01D71/26 , B29C67/20 , B29K23/00 , B29K105/04 , B29L7/00 , B32B27/12 , C08J5/18 , C08J9/28 , D01D5/24
CPC分类号： D01D5/24 , B01D67/003 , B01D69/08 , B01D71/26 , B32B27/12 , C08J9/28 , B01D2323/12 , C08J2201/0542
摘要： Microporous polypropylene membrane or hollow fibers is formed from a melt blend of 5 to 20 weight percent polypropylene and a solvent. The melt blend is shaped and cooled to effect solid phase separation of the polypropylene from the blend. The solvent is separated from the polypropylene by extraction and the porous polypropylene is dried under restraint to prevent shrinkage.
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公开(公告)号：US06977043B2
公开(公告)日：2005-12-20
申请号：US10704111
申请日：2004-03-17
CPC分类号： D01F6/32 , B01D67/0009 , B01D67/003 , B01D67/0095 , B01D69/08 , B01D71/36 , B01D2323/22 , B01D2325/022 , B01D2325/34 , D01D5/24
摘要： Hollow fiber membranes having a skinned surface on one diameter, and a porous surface on the opposite diameter are produced from perfluorinated thermoplastic polymers by extruding a heated solution of the polymer having a low critical solution temperature directly into a cooling bath to form the porous membrane by liquid-liquid phase separation. Extrusion can be conducted either vertically or horizontally. The hollow fiber membranes are useful as ultrafiltration membranes and as membrane contactors.
摘要翻译： 通过将具有低临界溶解温度的聚合物的加热溶液直接挤出到冷却浴中以形成多孔膜，由全氟化的热塑性聚合物制备具有一个直径的剥皮表面和相对直径上的多孔表面的中空纤维膜，以通过 液 - 液相分离。 挤出可以垂直或水平进行。 中空纤维膜可用作超滤膜和膜接触器。
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公开(公告)号：US5531899A
公开(公告)日：1996-07-02
申请号：US467259
申请日：1995-06-06
申请人： Larry Y. Yen , Ven Anantharaman , Bipin Parekh
发明人： Larry Y. Yen , Ven Anantharaman , Bipin Parekh
CPC分类号： B01D69/141 , C08J5/2275 , C08J2325/18 , C08J2423/06
摘要： A composite ultrahigh molecular weight polyethylene microporous membrane is provided having cation exchange capacity. The membrane is useful for removing metal ions from acidic aqueous solutions.
摘要翻译： 提供具有阳离子交换能力的复合超高分子量聚乙烯微孔膜。 该膜可用于从酸性水溶液中除去金属离子。
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公开(公告)号：US06921482B1
公开(公告)日：2005-07-26
申请号：US09889961
申请日：2000-01-27
CPC分类号： D01F6/32 , B01D67/0009 , B01D67/003 , B01D67/0095 , B01D69/08 , B01D71/36 , B01D2323/22 , B01D2325/022 , B01D2325/34 , D01D5/24
摘要： Hollow fiber membranes having a skinned surface on one diameter, and a porous surface on the opposite diameter arm produced from perfluorinated thermoplastic polymers by extruding a heated solution of the polymer having a lower critical solution temperature directly into a cooling bath to form the porous membrane by liquid-liquid phase separation. Extrusion can be conducted either vertically or horizontally. The hollow fiber membranes are useful as ultrafiltration membranes and as membrane contactors.
摘要翻译： 通过将具有较低临界溶解温度的聚合物的加热溶液直接挤出到冷却浴中以形成多孔膜，由全氟化的热塑性聚合物制成的具有一个直径的剥皮表面的空心纤维膜和相对直径臂上的多孔表面， 液 - 液相分离。 挤出可以垂直或水平进行。 中空纤维膜可用作超滤膜和膜接触器。
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