Coloring substance-containing liquid crystal mixtures
US4613208A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1983 |
| Grant date | Sep 23, 1986 |
| Priority date | — |
| Expiry date | Nov 18, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K19/06
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A liquid crystalline mixture comprising PA1 (a) at least one compound of the formula: ##STR1## wherein R.sup.1 is alkyl, alkoxy, p-alkylphenyl, p-alkoxyphenyl, trans-4-alkylcyclohexyl, 4'-alkyl-4-biphenylyl, p-(trans-4-alkylcyclohexyl)phenyl, 2-(trans-4-alkylcyclohexyl)ethyl or p-[2-(trans-4-alkylcyclohexyl)ethyl]phenyl and R.sup.2 is trans-4-alkylcyclohexyl; or R.sup.1 is trans-4-alkylcyclohexyl and R.sup.2 is p-(trans-4-alkylcyclohexyl)phenyl, p-[2-(trans-4-alkylcyclohexyl)ethyl]phenyl or 4'-(trans-4-alkylcyclohexyl)-4-biphenylyl; or R.sup.1 is p-alkylphenyl and R.sup.2 is p-[2-(trans-4-alkylcyclohexyl)ethyl]phenyl; and the alkyl and alkoxy groups in the substituents R.sup.1 and R.sup.2 are straight-chain groups of 1 to 7 carbon atoms, and; PA1 (b) at least one dichroic coloring substance selected from the group of compounds consisting of: ##STR2## wherein R.sup.3 is straight-chain C.sub.1 -C.sub.12 -alkyl and R.sup.4 is straight-chain C.sub.1 -C.sub.4 -alkyl, Z.sup.1 is hydrogen or chlorine, one of the symbols Z.sup.2, Z.sup.3 and Z.sup.4 is chlorine and the other two are hydrogen, and Y.sup.1 is hydrogen, Y.sup.2 is an amino group and Y.sup.3 is methyl or Y.sup.1 is hydroxy and…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.