Poly (2-hydroxyethylmethacrylate) membranes for electrochemical use
US4121022A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Dec 13, 1977 |
| Grant date | Oct 17, 1978 |
| Priority date | — |
| Expiry date | Dec 13, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention relates to a semi-permeable membrane for lead acid batteries. The membrane has a microporous structure comprising a first polymer and a second polymer closely mixed together, the first polymer being poly (2-hydroxyethylmethacrylate), known as reticulated poly HEMA, characterized by the fact that the second polymer comprises one polymer or a mixture of several different polymers chosen from among polyoxyethylene glycol, polyvinylpyrrolidone, polyacrylic acid, polymethacrylic acid, copolymers of acrylic and methacrylic acid, polyacrylates and polymethacrylates of alkyl, and the copolymers of the acrylates and methacrylates of alkyls.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.