Quasi-liquid crystals
US4927917A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1988 |
| Grant date | May 22, 1990 |
| Priority date | — |
| Expiry date | Dec 19, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K19/3483
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
There are provided compounds which give quasi-liquid crystals, which comprise a mesogenic group, which can contain bridging groups, a bridging group and a spiropyran moiety having a 2H pyran ring, a terminal group being attached to the mesogenic group. The mesogenic group contains two aromatic, heterocyclic or cycloaliphatic ring structures. The compounds are prepared by a coupling reaction of mesogenic groups with a spiropyran compound via a suitable bridging group. There is provided a process for producing quasi-liquid crystalline (QLC) films which are useful for producing a wide variety of devices based on the optical non-linearity of generation of second harmonics by such films. Such devices can also be based on ferroelectric, pyroelectric, piezoelectric effects and photoactivity of such oriented QLC films.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.