Polymeric sheet
US5922417A · kind A · utility
22Cited by
9References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 5, 1994 |
| Grant date | Jul 13, 1999 |
| Priority date | — |
| Expiry date | Jan 5, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/2918
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A polymeric sheet, which is particularly suited for use as a separator in an electrochemical device, is formed by graft copolymerising acrylic acid, or another vinyl monomer capable of reacting with an acid or a base to form a salt directly or indirectly with fibers of a non-woven sheet, whose outer surface is provided by a polyolefin, especially polypropylene. The polyolefin is crosslinked as a result of the polymerisation reaction. The polymerisation reaction is preferably initiated by exposure of the sheet to ultraviolet radiation, after impregnation with an appropriate solution of the vinyl monomer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.