Anisotropic compounds and liquid crystal mixtures
US4622163A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 1984 |
| Grant date | Nov 11, 1986 |
| Priority date | — |
| Expiry date | Sep 10, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K19/3455
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
New anisotropic compounds with a cross-polarizing substituent have the formula (1) ##STR1## The increase in .epsilon..perp. is achieved by the polarizing group X, preferably the cyano group or a halogen atom, which is not laterally on the ring, as with the known compounds, but is on the bridge, that is to say is part of the main bridge bonding rings A and B to one another. Ring A has the formula (1a) or (1b) given herein and is always cycloaliphatic, while ring B can be identical to ring A or is an aromatic ring of the formula (1c) or (1d) herein. R.sup.1 and R.sup.2 are identical or different end groups of the formula (1e) herein. The radical X on the bridge causes less widening of the molecule than a radical X on a ring, which provides comparatively higher clear points and moreover enables aromatic rings to be omitted from the anisotropic compounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.