Liquid crystalline medium
View Patent ↗The present invention relates to low viscosity, broad range nematic media having large birefringence and moderately large dielectric anisotropy. The nematic media are useful in a variety of electrooptical devices, including electronic lenses.
1. A liquid crystalline nematic medium comprising:
a. a mixture comprising at least six isothiocyanato components selected from the group consisting of formulae 1-13:
wherein n is an integer of from 1 to 5, and
b. at least one compound selected from the group consisting of fluorosubstituted biphenyls and/or terphenyls expressed by the formulae 14-24
wherein n and m are independently integers of from 1 to 5.
2. The liquid crystalline medium according to claim 1 , wherein one or more of the at least six isothiocyanato components are selected from the group consisting of formulae 9, 10, and 11.
3. The liquid crystalline medium according to claim 1 , wherein the mixture comprising at least six isothiocyanato components is provided in an amount ranging from about 40 to about 95 wt. %.
4. The liquid crystalline medium according to claim 2 , further comprising a chiral compound selected from the group consisting of formulae 25, 26, and 27
5. The liquid crystalline medium according claim 1 , wherein the medium has an optical anisotropy in the range from 0.2 to 0.35.
6. The liquid crystalline medium according to claim 1 , wherein the medium further comprises UV stabilizers and polymers.
7. The liquid crystalline medium according to claim 2 , wherein the medium further comprises UV stabilizers and polymers.
8. The liquid crystalline medium according to claim 4 , wherein the medium further comprises UV stabilizers and polymers.