Patent ID: 12258509

EXAMPLES

Comparative Mixture C1 and Example mixtures N1 to N22 for use according to the invention having the compositions and properties as indicated in the following tables are prepared and characterized with respect to their general physical properties and their applicability in optical components.

An optical component comprising the media according to the invention as defined in claim1, and fabricated according to the process as defined in claim12is distinguished by excellent operational stability when exposed to the environment because of high clearing temperature, broad nematic phase range and excellent low-temperature stability (LTS) of the liquid crystal medium used therein. As a result, the component, and devices containing the component, are operable under extreme temperature conditions. Surprisingly, the temperature dependence of the birefringence of said liquid crystal medium is very small, i.e. the Δn changes little with the temperature which makes a device reliable and easy to control.

Comparative Mixture C1CP-1V-N12.0%TN,I[° C.]:111ME3N.F3.0%Δn [589.3 nm, 20° C.]0.2939ME4.NF13.0%ne[589.3 nm, 20° C.]1.8139PTP-1-O24.0%no[589.3 nm, 20° C.]1.5200PTP-2-O15.0%Δε [1 kHz, 20° C.]:13.4PTP-3-O15.0%ε∥[1 kHz, 20° C.]:17.8CPTP-3-O13.0%ε⊥[1 kHz, 20° C.]:4.4PPTUI-3-220.0%γ1[mPas, 20° C.]:334PPTUI-3-435.0%K1[pN, 20° C.]:13.0Σ100.0%K3[pN, 20° C.]:16.5K3/K1[pN, 20° C.]:1.27V0[V, 20° C.]:1.04LTSbulk(−20° C.)192

Example N1PTU-3-S15.0%TN,I[° C.]:124.5PTU-5-S15.0%Δn [589.3 nm, 20° C.]0.3628PGU-3-S15.0%ne[589.3 nm, 20° C.]1.9034PPTU-5-S10.0%no[589.3 nm, 20° C.]1.5406CPU-2-S28.0%Δε [1 kHz, 20° C.]:22.0CPU-4-S17.0%ε∥[1 kHz, 20° C.]:26.7Σ100.0%ε⊥[1 kHz, 20° C.]:4.6γ1[mPas, 20° C.]:307K1[pN, 20° C.]:14.5K3[pN, 20° C.]:18.0K3/K1[pN, 20° C.]:1.24V0[V, 20° C.]:0.85LTSbulk(−20° C.)>1000

Example N2PTU-3-S10.0%TN,I[° C.]:149.5PTU-5-S8.0%Δn [589.3 nm, 20° C.]0.3838PGU-3-S18.0%ne[589.3 nm, 20° C.]1.9232PPTU-4-S7.0%no[589.3 nm, 20° C.]1.5394PPTU-5-S9.0%Δε [1 kHz, 20° C.]:23.3PGTU-4-S6.0%ε∥[1 kHz, 20° C.]:27.7CPU-2-S22.0%ε⊥[1 kHz, 20° C.]:4.5CPU-4-S20.0%γ1[mPas, 20° C.]:394Σ100.0%K1[pN, 20° C.]:16.8K3[pN, 20° C.]:20.6K3/K1[pN, 20° C.]:1.23V0[V, 20° C.]:0.90LTSbulk(−20° C.)>1000LTSbulk(−30° C.)768LTSbulk(−40° C.)96

The birefringence of comparative mixture C-1 and of mixture examples N-1 and N-2 are determined at 20° C. and 60° C. The results are shown in Table 1.

TABLE 1MixtureΔn20Δn60Δn20/Δn60C-10.29390.25111.170N-20.38380.35381.085N-30.42670.39511.080

Surprisingly, the ratio Δn20/Δn60is favorably smaller for the media according to the invention, i.e. they show less variation of the birefringence with temperature compared to the medium of the state of the art.

Example N3PTU-3-S10.0%TN,I[° C.]:156PTU-5-S11.0%Δn [589.3 nm, 20° C.]0.4267PPTU-4-S6.0%Δε [1 kHz, 20° C.]:18.8PPTU-5-S10.0%ε∥[1 kHz, 20° C.]:22.8PGTU-4-S6.0%ε⊥[1 kHz, 20° C.]:4.0PGU-3-S12.0%γ1[mPas, 20° C.]:461PPU-TO-S23.0%K1[pN, 20° C.]:17.0CPTU-5-S22.0%K3[pN, 20° C.]:25.0Σ100.0%K3/K1[pN, 20° C.]:1.47V0[V, 20° C.]:1.01

Example N4PTU-3-S10.0%TN,I[° C.]:152PTU-5-S11.0%Δn [589.3 nm, 20° C.]0.4263PPTU-4-S6.0%Δε [1 kHz, 20° C.]:18.5PPTU-5-S5.0%ε∥[1 kHz, 20° C.]:22.6PPTU-(c3)1-S5.0%ε⊥[1 kHz, 20° C.]:4.1PGTU-4-S6.0%γ1[mPas, 20° C.]:472PGU-3-S12.0%K1[pN, 20° C.]:16.9PPU-TO-S23.0%K3[pN, 20° C.]:24.8CPTU-5-S22.0%Σ100.0%

Example N5PTU-3-S12.0%PTU-5-S12.0%PPTU-4-S6.0%PPTU-5-S5.0%PPTU-(c3)1-S6.0%PGTU-4-S6.0%PGU-3-S12.0%PPU-TO-S23.0%CPTU-(c3)1-S18.0%Σ100.0%

Example N6PTU-3-S12.0%PTU-5-S12.0%PPTU-4-S6.0%PPTU-5-S5.0%PTPU-(c3) 1-S6.0%PGTU-4-S6.0%PGU-3-S12.0%PPU-TO-S23.0%CPTU-(c3)1-S18.0%Σ100.0%

Example N7PTU-3-S10.0%TN,I[° C.]:155.5PTU-4O-S8.0%Δn [589.3 nm, 20° C.]0.3874PTU-3-S18.0%Δε [1 kHz, 20° C.]:24.0PPTU-4-S7.0%PPTU-5-S9.0%PGTU-4-S6.0%CPU-2-S22.0%CPU-4-S20.0%Σ100.0%

Example N8PTU-2O-S8.0%TN,I[° C.]155.5PTU-4O-S10.0%Δn [589.3 nm, 20° C.]0.3874PGU-3-S18.0%Δε [1 kHz, 20° C.]24.0PPTU-4-S7.0%PPTU-5-S9.0%PGTU-4-S6.0%CPU-2-S22.0%CPU-4-S20.0%Σ100.0%

Example N9PTG-2O-S8.0%TN,I[° C.]162.5PTG-4O-S8.0%Δn [589.3 nm, 20° C.]0.3919PTU-2O-S8.0%Δε [1 kHz, 20° C.]24.6PTU-4O-S10.0%PGU-3-S15.0%PPTU-4-S10.0%PPTU-5-S9.0%PGTU-4-S6.0%CPU-2-S6.0%CPU-4-S20.0%Σ100.0%

Example N10PTG-2O-S8.0%TN,I[° C.]148.0PTG-4O-S8.0%Δn [589.3 nm, 20° C.]0.4191PTU-2O-S8.0%PTU-(c3)1-O-S10.0%PGU-3-S15.0%PPTU-4-S10.0%PPTU-5-S9.0%PGTU-4-S6.0%CPU-2-S6.0%CPU-4-S20.0%Σ100.0%

Example N11PTG-2O-S8.0%TN,I[° C.]:157.0PTG-4O-S8.0%Δn [589.3 nm, 20° C.]0.4114PTU-4O-S10.0%Δε [1 kHz, 20° C.]:24.1PGU-3-S18.0%PPTU-4-S10.0%PPTU-5-S9.0%PGTU-4-S6.0%CPU-2-S11.0%CPU-4-S20.0%Σ100.0%

Example N12PTU-3-S15.0%TN,I[° C.]:135.5PTU-4O-S15.0%Δn [589.3 nm, 20° C.]0.3696PGU-3-S15.0%PPTU-5-S10.0%CPU-2-S28.0%CPU-4-S17.0%Σ100.0%

Example N13PTU-3-S5.0%TN,I[° C.]:143.0PTU-2O-S10.0%Δn [589.3 nm, 20° C.]0.3746PTU-4O-S15.0%PGU-3-S15.0%PPTU-5-S10.0%CPU-2-S28.0%CPU-4-S17.0%Σ100.0%

Example N14PTG-2O-S10.0%TN,I[° C.]:147.0PTG-4O-S10.0%Δn [589.3 nm, 20° C.]0.3812PTU-4O-S10.0%PGU-3-S15.0%PPTU-5-S10.0%CPU-2-S28.0%CPU-4-S17.0%Σ100.0%

Example N14PTG-2O-S8.0%TN,I[° C.]:143.0PTG-4O-S8.0%Δn [589.3 nm, 20° C.]0.3865PTU-2O-S8.0%Δε [1 kHz, 20° C.]:24.2PTU-4O-S10.0%PGU-3-S15.0%PPTU-5-S10.0%CPU-2-S28.0%CPU-4-S13.0%Σ100.0%

Example N16PTU-3-S10.0%TN,I[° C.]:164PTU-4O-S11.0%Δn [589.3 nm, 20° C.]0.4316PPTU-4-S6.0%Δε [1 kHz, 20° C.]:20.0PPTU-5-S10.0%PGTU-4-S6.0%PGU-3-S12.0%PPU-TO-S23.0%CPTU-5-S22.0%Σ100.0%

Example N17PTU-2O-S8.0%TN,I[° C.]:172.5PTU-4O-S12.0%Δn [589.3 nm, 20° C.]0.4358PPTU-4-S6.0%Δε [1 kHz, 20° C.]:23.3PPTU-5-S10.0%PGTU-4-S6.0%PGU-3-S13.0%PPU-TO-S23.0%CPTU-5-S22.0%Σ100.0%

Example N18PTG-2O-S8.0%TN,I[° C.]:162PTG-4O-S8.0%Δn [589.3 nm, 20° C.]0.4459PTU-2O-S8.0%Δε [1 kHz, 20° C.]:20.6PTU-4O-S10.0%PPTU-4-S6.0%PPTU-5-S10.0%PGTU-4-S6.0%PPU-TO-S23.0%CPTU-5-S22.0%Σ100.0%

Example N19PTG-2O-S8.0%TN,I[° C.]:167.5PTG-4O-S8.0%Δn [589.3 nm, 20° C.]0.4420PTU-4O-S10.0%Δε [1 kHz, 20° C.]:19.5PPTU-4-S6.0%PPTU-5-S10.0%PGTU-4-S6.0%PGU-3-S7.0%PPU-TO-S23.0%CPTU-5-S22.0%Σ100.0%

Example N20PTG-(c3)1O-S8.0%TN,I[° C.]:158PTG-4O-S7.0%Δn [589.3 nm, 20° C.]0.4457PTU-2O-S8.0%PTU-4O-S10.0%PPTU-4-S6.0%PPTU-5-S10.0%PGTU-4-S6.0%PPU-TO-S23.0%CPTU-5-S22.0%Σ100.0%

Example N21PTU-3-S12.0%TN,I[° C.]:141.5PTU-5-S12.0%Δn [589.3 nm, 20° C.]0.3981PPTU-4-S8.0%ne[589.3 nm, 20° C.]1.9377PPTU-5-S8.0%no[589.3 nm, 20° C.]1.5396PGTU-4-S10.0%Δε [1 kHz, 20° C.]:21.3PGU-3-S10.0%ε∥[1 kHz, 20° C.]:25.7PPU-TO-S10.0%ε⊥[1 kHz, 20° C.]:4.4CPU-2-S15.0%γ1[mPa s, 20° C.]:364CPU-4-S15.0%K1[pN, 20° C.]:16.0Σ100.0%K3[pN, 20° C.]:20.0K3/K1[pN, 20 °C.]:1.25V0[V, 20° C.]:0.91

Example N22PTU-3-S12.0%TN,I[° C.]:141.5PTU-5-S12.0%Δn [589.3 nm, 20° C.]0.4108PPTU-4-S6.0%ne[589.3 nm, 20° C.]1.9500PPTU-5-S14.0%no[589.3 nm, 20° C.]1.5392PGTU-4-S6.0%Δε [1 kHz, 20° C.]:21.1PGU-3-S15.0%ε∥[1 kHz, 20° C.]:25.4PPU-TO-S15.0%ε⊥[1 kHz, 20° C.]:4.4CPU-2-S12.0%γ1[mPa s, 20° C.]:380CPU-4-S8.0%K1[pN, 20° C.]:16.6Σ100.0%K3[pN, 20° C.]:21.4K3/K1[pN, 20 °C.]:1.29V0[V, 20° C.]:0.94

Furthermore, the media according to the invention are distinguished by a high clearing temperature in combination with excellent low temperature stability, i.e. they have a very broad operating temperature range.

Furthermore, the media according to the invention show a surprisingly low threshold voltage V0.

Surprisingly, a medium comprising a compound RO with an alkoxy side chain has an even higher birefringence and higher clearing temperature than a medium comprising exclusively compounds with an alkyl side chain.