Ultrathin film, process for production thereof, and use thereof for concentrating a specified gas in a gaseous mixture
US4493714A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 4, 1983 |
| Grant date | Jan 15, 1985 |
| Priority date | — |
| Expiry date | May 4, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/778
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An ultrathin film composed substantially of silicon-containing polyurea comprising polyaddition bonded units derived from PA0 (A) at least one polyamine selected from the group consisting of silicon-containing polyamines and hydrocarbon-type polyamines, each of said polyamines containing at least two primary or secondary amino groups in the molecule, and PA0 (B) at least one polyisocyanate compound selected from the group consisting of silicon-containing polyisocyanates and hydrocarbon-type polyisocyanates, each of said polyisocyanates having at least two isocyanate groups in the molecular chains; provided that when the polyisocyanate compound is the hydrocarbon-type polyisocyanate alone, at least one of the selected polyamines is a silicon-containing polyamine containing at least one terminal amino group in the molecule. A composite structure composed of a microporous supporting film and the ultrathin film supported thereon is useful for the production of a gaseous mixture containing a specified gas in a high concentration from a mixture of two or more gases including said specified gas, and is prepared by subjecting the polyamine and the polyisocyante compound to interfacial poly…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.