Method of forming microporous membranes
US6998063B2 · kind B2 · utility
0Cited by
16References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 29, 2003 |
| Grant date | Feb 14, 2006 |
| Priority date | — |
| Expiry date | Dec 8, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of forming a microporous fluoropolymer membrane, comprising the steps of:irradiating a sheet of fluoropolymer at a dosage level below the rupture energy of the carbon-to-fluorine (C—F) bonds of the fluoropolymer, but sufficient to rupture carbon-to-carbon (C—C) bonds; andexposing the sheet of fluoropolymer to an etchant for a period of time sufficient to etch away disrupted atoms and molecules, wherein continuous micropassages are formed through the sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.