Ultrathin membrane of polymethacrylate or polycrotonate and device provided with ultrathin membrane
US5209847A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Oct 1, 1990 |
| Grant date | May 11, 1993 |
| Priority date | — |
| Expiry date | Oct 1, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K19/56
- WIPO fieldMicro-structural and nano-technology
- WIPO sectorChemistry
Abstract
An ultrathin polymeric membrane has a membrane thickness of 10 to 1,000 .ANG.. The membrane is constituted of polycarboxylate and obtained by the spin coating method or by the Langmuir-Blodgett method. The polycarboxylate contains recurrent units represented by the formula (I) ##STR1## wherein R.sub.1 and R.sub.2 represent different groups and each stands for a methyl group or a hydrogen atom, and R represents a hydrocarbon group selected from the group consisting of a branched alkyl group having 3 to 12 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, a substituted alkyl group having 2 to 6 carbon atoms, a substituted cycloalkyl group having 3 to 10 carbon atoms and a siloxanic hydrocarbon group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.