Charged porous filter
US5114585A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1989 |
| Grant date | May 19, 1992 |
| Priority date | — |
| Expiry date | Dec 27, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2323/30
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for preparing charge modified filtration media including the steps of forming a filtration microporous or macroporous membranous or nonmembranous medium structure having internal and external surfaces and including a quaternizable nitrogen containing polymer exposed at the internal and external surfaces, permanently charging the exposed quaternizable nitrogen, and rendering the polymer insoluble in solution and permanently adhered within the filtration medium structure. Charge modified filtration media including a filtration medium structure as described having internal and external surfaces, characterized by a quaternizable nitrogen containing polymer exposed at the internal and external surfaces and having permanently charged quaternizable nitrogen. The quaternized nitrogen containing polymer is insoluble in solution and permanently adhered within the filtration medium structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.