Method for manufacturing microporous membrane
US4466931A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 5, 1982 |
| Grant date | Aug 21, 1984 |
| Priority date | — |
| Expiry date | Aug 5, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2201/0546
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The starting materials for the practice of the present invention are (1) one or more organic monomers or oligomers which upon irradiation very rapidly undergo a polymerization reaction to form a solid polymer; and (2) a liquid vehicle in which the one or more organic monomers or oligomers are soluble but in which the polymer formed is insoluble. For the manufacture of microporous membrane in accordance with the invention the monomers or oligomers are dissolved in the liquid vehicle, the resulting solution is formed into a thin layer, and the thin layer of the solution is then irradiated as with ultraviolet or electron beam radiation whereupon the rapid polymerization reaction immediately ensues and the polymer formed immediately segregates from the vehicle thereby resulting in microporous membrane from which the vehicle can be removed as by evaporation or washing. Because the radiation-induced polymerization reaction and the segregation of the polymer formed are so rapid, the membrane formed has cells and communications therebetween of very small dimensions thereby providing the microporous structure. Where ultraviolet radiation is used the solution also includes a photoinitiator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.