Process for making a three-zone microporous membrane
US6776940B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 2001 |
| Grant date | Aug 17, 2004 |
| Priority date | — |
| Expiry date | Nov 11, 2022 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06N2211/30
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Methods for manufacturing reinforced, three-zone, microporous membrane having a plurality of different possible pore sizes from at least a single mother dope batch, including formulating at least a single mother dope batch, controllably formulating the dope in at least one vessel such that the dope temperature does not exceed a predetermined maximum mixing temperature and is maintained at a temperature lower than the mixing temperature, heating a small portion of the dope to a target temperature corresponding to a specific desired pore size to be formed in at least one zone of the microporous membrane in at least one thermal manipulation apparatus cooling the dope to about room temperature or a temperature which results in a suitable and/or optimal coating viscosity, operatively connecting at least one dope application apparatus is to the at least one thermal manipulation apparatus for transporting the manipulated dope to a dope processing site.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.