Cyclohexyl- and cyclohexenyl-substituted liquid crystals with low birefringence
US6413448B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 1999 |
| Grant date | Jul 2, 2002 |
| Priority date | — |
| Expiry date | Apr 26, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K19/3458
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A liquid crystal composition comprising a host material and a low birefringence liquid crystal composition of the formula:R1—Ar—R2whereinR1 and R2, independently of one another, are selected from the group consisting of internally branched alkyl groups having from 4 to 20 carbon atoms, terminally branched alkyl groups having from 3 to 20 carbon atoms, internally branched alkenyl groups having from 3 to 20 carbon atoms and terminally branched alkenyl groups having from 4 to 20 carbon atoms, wherein one or more —CH2— groups in R1 and R2 may be independently replaced with O, said R1 or R2, independently of one another, can be partially or fully halogenated, and wherein one or both of said R1 and R2 can be absent;Ar is a ring core moiety of the general formula: wherein Cyc is a cyclohexyl ring or a cyclohexenyl ring;RX is a phenyl ring which may be optionally substituted with one or more fluorines; RY is a cyclohexyl or cyclohexenyl ring;wherein x and y are 1 and z is 0;wherein A is COO; and B is selected from the group of small alkyl or alkenyl group having from 1 to 8 carbon atoms, COO and OCO;wherein a and b are 1 and d is zero.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.