Liquid crystal compounds having ether tail moiety
US5132041A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1987 |
| Grant date | Jul 21, 1992 |
| Priority date | — |
| Expiry date | Jun 23, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K19/26
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Disclosed are smetic liquid crystal compounds exhibiting ferroelectric behavior and having the formula EQU R.sup.1 --OR.sup.2).sub.a O--R.sup.3).sub.b Z--R* wherein R.sup.1 is alkyl or alkoxyalkyl, R.sup.2 and R.sup.3 are each alkylene, a is an integer of at least one, b is zero or one, R* is an optically active group containing an asymmetric center and --Z-- is an organic divalent core radical having parallel or coaxially extending bonds at the terminal ends thereof, the core radical having an axial ratio of at least two and being characterized by an essentially rigid and flat molecular structure. Presence of the ether-interrupted hydrocarbon tail moiety at the terminal end of the compounds provides a lowering in observed temperatures of phase transition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.