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公开(公告)号：US10322381B2
公开(公告)日：2019-06-18
申请号：US15328115
申请日：2015-07-21
申请人： Arkema Inc.
IPC分类号： B01D71/34 , B01D71/38 , B01D71/36 , B29C48/05 , D01F1/08 , D01F6/12 , B29C48/02 , B29C48/10 , B29C48/00 , B01D69/02 , B01D69/08 , B01D71/76 , D01D5/247 , B01D71/32 , B29K27/00 , B29L23/00 , B29L31/00
摘要： Hollow fiber membranes having improved toughness and durability are prepared using a vinylidene fluoride polymer-containing component, such as Kynaro resins, having relatively low crystallinity. One aspect of the invention provides a membrane in the form of a fiber, wherein i) the fiber has a porous wall of a polymeric component enclosing a central hollow space extending the length of the fiber, ii) the polymeric component has a crystallinity as determined by wide angle x-ray diffraction of less than about 35%, iii) the polymeric component is comprised of at least one homopolymer or copolymer of vinylidene fluoride and iv) the membrane has an energy to break of at least about 0.5 J per square mm of membrane cross section.
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公开(公告)号：US11065587B2
公开(公告)日：2021-07-20
申请号：US14770125
申请日：2014-02-27
申请人： Arkema Inc.
摘要： The invention relates to membranes formed from long chain branched fluoropolymers, and especially long chain branched homopolymers and copolymers of polyvinylidene fluoride such as KYNAR resins. The novel membranes retain all the advantages of a fluoropolymer membrane (excellent chemical resistance especially to strong acids and oxidizing agents, and good mechanical strength), and additionally offer improved permeability, improved strain hardening, and even better resistance to caustic attacks. The improvements are believed to be related to an improvement to the microstructure of the membranes, producing a more open structure due to the long chain branched fluoropolymers. Further improvements in the mechanical properties of the membranes can be induced by strain hardening.
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