Formation of porous membranes by mechanical deformation
US4762657A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 1985 |
| Grant date | Aug 9, 1988 |
| Priority date | — |
| Expiry date | Dec 12, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/47
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
This invention relates to a method for producing large area, controlled, uniform deformation of polymeric films which retards premature fracturing. The method includes a deformation step. Sulfonating and annealing the sulfonated deformed film are optional treatments of the method. Deformation can be achieved using pressing, peeling or rolling techniques. The deformed film is sulfonated utilizing sulfuric acid or fuming sulfuric acid. The product obtained using the inventive method results in a deformed film which has improved flow and entrance pressure characteristics compared to non-deformed film materials. The product can be used as a microfiltration membrane, ultrafiltration membrane or filter for various gas, vapor or liquid mixtures. The film may also serve as a porous substrate or other media for other types of fluid separation or purification.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.