High toughness hollow fiber membranes based on vinylidene fluoride polymers
US10322381B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 2015 |
| Grant date | Jun 18, 2019 |
| Priority date | — |
| Expiry date | Dec 5, 2035 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/755
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.