Uniform polyvinylidene difluoride membranes
US5198505A · kind A · utility
5Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 11, 1991 |
| Grant date | Mar 30, 1993 |
| Priority date | — |
| Expiry date | Apr 11, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D71/34
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A heat-treated, hydrophobic, polyvinylidene difluoride membrane is provided having uniform crystallinity as evidenced by a difference in crystallinity over the membrane of less than about 10 percent. Also provided is a hydrophilic, polyvinylidene difluoride membrane prepared from a heat-treated, hydrophobic, polyvinylidene difluoride membrane which remains hydrophilic after heating to a temperature as high as about 121.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.