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公开(公告)号：US20200289991A1
公开(公告)日：2020-09-17
申请号：US16651123
申请日：2018-09-28
发明人： Takaaki Yasuda , Kentaro Kobayashi
摘要： The present invention provides a porous hollow fiber membrane suitable for the removal of minute substances, e.g., viruses, contained in a liquid. The present invention relates to a porous hollow fiber membrane which is provided with a separation-functioning layer containing a fluororesin, has a gas diffusion amount of 0.5 to 5.0 mL/m2/hr as measured in a diffusion test, and also has foaming points at a density of 0.005 to 0.2 point/cm2 as measured in a foaming test under the immersion in 2-propanol.
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公开(公告)号：US20220056235A1
公开(公告)日：2022-02-24
申请号：US17413734
申请日：2019-12-24
发明人： Shun Shimura , Masayuki Hanakawa , Kenta Iwai , Takaaki Yasuda
摘要： The present invention relates to a porous membrane including a polymer including a polyvinylidene fluoride-based resin as a main component, and a branched polyvinylidene fluoride-based resin as the polyvinylidene fluoride-based resin, in which the polymer has a value of a of 0.32 to 0.41 and a value of b of 0.18 to 0.42, each of which is determined by approximation according to the formula 1 below from a radius of gyration 1/2 and an absolute molecular weight Mw of the polymer which are measured by GPC-MALS (gel permeation chromatograph equipped with a multi-angle light scattering detector). 1/2=bMwa (Formula 1)
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公开(公告)号：US11058996B2
公开(公告)日：2021-07-13
申请号：US16079837
申请日：2017-02-24
摘要： An object of the present invention is to provide a porous hollow-fiber membrane satisfying both high strength and high pure-water permeation performance and at the same time, having high bending resistance. The present invention relates to a porous hollow-fiber membrane including a fluororesin-based polymer, in which the porous hollow-fiber membrane has a columnar texture oriented in a longitudinal direction of the porous hollow-fiber membrane and when a photograph of a cross-section parallel to the longitudinal direction of the porous hollow-fiber membrane is binarized into a structure portion and a void portion, the following 1) and 2) are satisfied: 1) a proportion of an area of the void portion is from 20 to 50%, and 2) a value obtained by dividing a total of peripheral lengths of the void portions by a total of areas of the void portions is 2.0 μm−1 or less.
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公开(公告)号：US12097470B2
公开(公告)日：2024-09-24
申请号：US17413734
申请日：2019-12-24
发明人： Shun Shimura , Masayuki Hanakawa , Kenta Iwai , Takaaki Yasuda
CPC分类号： B01D67/0011 , B01D67/0016 , B01D69/02 , B01D69/1071 , B01D69/108 , B01D69/12 , B01D71/34 , C08J9/0061 , C08J9/28 , C08L27/16 , B01D2325/02832 , B01D2325/02833 , B01D2325/20 , B01D2325/34 , B01D2325/36 , C08J2201/0544 , C08J2327/16
摘要： The present invention relates to a porous membrane including a polymer including a polyvinylidene fluoride-based resin as a main component, and a branched polyvinylidene fluoride-based resin as the polyvinylidene fluoride-based resin, in which the polymer has a value of a of 0.32 to 0.41 and a value of b of 0.18 to 0.42, each of which is determined by approximation according to the formula 1 below from a radius of gyration 1/2 and an absolute molecular weight Mw of the polymer which are measured by GPC-MALS (gel permeation chromatograph equipped with a multi-angle light scattering detector). 1/2=bMwa (Formula 1).
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公开(公告)号：US10456753B2
公开(公告)日：2019-10-29
申请号：US15755755
申请日：2016-06-24
发明人： Takaaki Yasuda , Masayuki Hanakawa , Kenta Iwai , Toshiyuki Ishizaki , Tamotsu Kitade , Masahiro Kimura
摘要： The present invention provides a porous hollow fiber membrane that has both high strength and high pure water permeability, and that exhibits excellent thermal deformation resistance. The present invention is related to a porous hollow fiber membrane containing a fluororesin-based polymer, and a manufacturing method of the membrane comprises a drawing step and a relaxing step. The porous hollow fiber membrane is characterized in that: the molecular chain of the polymer is oriented in the longitudinal direction of the hollow fiber membrane; and at the same time internal distortion of oriented non-crystalline chains, which is disadvantageous in terms of entropy, is alleviated.
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