LIQUID-CRYSTAL MEDIUM COMPRISING POYLMERIZABLE COMPOUNDS

Abstract

The present invention relates to a liquid-crystal (LC) medium comprising polymerizable compounds, to its use for optical, electro-optical and electronic purposes, in particular in LC displays, especially in LC displays of the PSA (polymer sustained alignment) or SA (self-aligning) mode, to an LC display of the PSA or SA mode comprising the LC medium, and to a process of manufacturing the LC display using the LC medium, especially an energy-saving LC display and energy-saving LC display production process.

Claims

1. An LC medium having negative dielectric anisotropy and comprising one or more polymerizable compounds and one or more dopants of formula IA ##STR00570## wherein alkyl and alkyl* each, independently of one another, denote a C.sub.1-6-straight-chain, C.sub.3-6-branched or C.sub.3-6-cyclic alkyl radical, wherein the total proportion of the dopants of formula IA in the LC medium is from 0.01 to 0.8% by weight.

2. The LC medium according to claim 1, wherein the dopants of formula IA are of the following subformulae: ##STR00571##

3. The LC medium according to claim 1, having a total proportion of dopants of formula IA in the LC medium of 0.02 to 0.6% by weight.

4. The LC medium according to claim 1, further comprising one or more compounds of formula IB ##STR00572## in which the individual radicals, on each occurrence identically or differently, and each, independently of one another, have the following meaning: R.sup.1, R.sup.2 C.sub.1-25-straight chain, C.sub.3-25-branched or C.sub.3-25-cyclic alkyl, wherein one or more non-adjacent CH.sub.2-groups are optionally replaced by —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O—, —CR.sup.0═CR.sup.00—, —C≡C—, ##STR00573## in such a manner that O- and/or S-atoms are not directly connected with each other, and wherein one or more H atoms are each optionally replaced by F or Cl, R.sup.0, R.sup.00H or alkyl having 1 to 12 C atoms, L.sup.1, L.sup.2 F or Cl, Y H, F, Cl, CF.sub.3, CHF.sub.2 or CH.sub.3.

5. The LC medium according to claim 4, wherein the compounds of formula IB are of the following subformulae: ##STR00574## in which alkyl and alkyl* each, independently of one another, denote a straight-chain alkyl radical having 1-6 C atoms, alkenyl and alkenyl* each, independently of one another, denote a straight-chain alkenyl radical having 2-6 C atoms, alkoxy and alkoxy* each, independently of one another, denote a straight-chain alkoxy radical having 1-6 C atoms, and L.sup.11 and L.sup.12 each, independently of one another, denote F or Cl.

6. The LC medium according to claim 4, wherein the compounds of formula IB are of the following subformulae: ##STR00575## in which alkoxy denotes a straight-chain alkoxy radical having 1-6 C atoms.

7. The LC medium according to claim 1, additionally comprising one or more compounds of formula IC ##STR00576## Wherein R.sup.1, R.sup.2 C.sub.1-25-straight chain, C.sub.3-25-branched or C.sub.3-25-cyclic alkyl, wherein one or more non-adjacent CH.sub.2-groups are optionally replaced by —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O—, —CR.sup.0═CR.sup.00—, —C≡C—, ##STR00577## in such a manner that O- and/or S-atoms are not directly connected with each other, and wherein one or more H atoms are each optionally replaced by F or Cl, R.sup.0, R.sup.00 H or alkyl having 1 to 12 C atoms, L.sup.1, L.sup.2 For Cl.

8. The LC medium according to claim 7, wherein the compounds of formula IC are of the following subformulae: ##STR00578## in which alkyl and alkyl* independently of each other denote a straight-chain alkyl radical having 1-6 C atoms, and (0) denotes an oxygen atom or a single bond.

9. The LC medium according to claim 1, additionally comprising one or more compounds of the formulae IIA, IIB and IID and optionally one or more compounds of formula IIC which are different from formula IA ##STR00579## in which R.sup.2A and R.sup.2B each, independently of one another, denote H, a C.sub.1-15-alkyl or C.sub.2-15-alkenyl radical which is unsubstituted, monosubstituted by CN or CF.sub.3 or at least monosubstituted by halogen, where, in addition, one or more CH.sub.2 groups in these radicals may be replaced by —O—, —S—, ##STR00580## —C≡C—, —CF.sub.2O—, —OCF.sub.2—, —OC—O— or —O—CO— in such a way that 0 atoms are not linked directly to one another, L.sup.1 to L.sup.4 each, independently of one another, denote F, Cl, CF.sub.3 or CHF.sub.2, Y denotes H, F, Cl, CF.sub.3, CHF.sub.2 or CH.sub.3, Z.sup.2, Z.sup.2B, Z.sup.2D each, independently of one another, denote a single bond, —CH.sub.2CH.sub.2—, —CH═CH—, —CF.sub.2O—, —OCF.sub.2—, —CH.sub.2O—, —OC H.sub.2—, —COO—, —COO—, —C.sub.2F.sub.4—, —CF═CF—, —CH═CHCH.sub.2O—, p denotes 0, 1 or 2, and q on each occurrence, identically or differently, denotes 0 or 1.

10. The LC medium according to claim 1, additionally comprising one or more compounds of formula IV ##STR00581## in which R.sup.41 denotes an unsubstituted alkyl radical having 1 to 7 C atoms or an unsubstituted alkenyl radical having 2 to 7 C atoms, and R.sup.42 denotes an unsubstituted alkyl radical having 1 to 7 C atoms, an unsubstituted alkoxy radical having 1 to 6 C atoms, or an unsubstituted alkenyl radical having 2 to 7 C atoms.

11. The LC medium according to claim 1, additionally comprising one or more compounds of formula V ##STR00582## in which R.sup.51 denotes an unsubstituted alkyl radical having 1 to 7 C atoms or an unsubstituted alkenyl radical having 2 to 7 C atoms, and R.sup.52 denotes an unsubstituted alkyl radical having 1 to 7 C atoms, an unsubstituted alkoxy radical having 1 to 6 C atoms, or an unsubstituted alkenyl radical having 2 to 7 C atoms. ##STR00583## identically or differently, denote ##STR00584## Z.sup.51, Z.sup.52 each, independently of one another, denote —CH.sub.2—CH.sub.2—, —CH.sub.2—O—, —CH═CH—, —C≡C—, —COO— or a single bond, and n is 1 or 2.

12. The LC medium according to claim 1, additionally comprising one or more additives that are stabilizers, chiral dopants, polymerization initiators or self-alignment additives.

13. The LC medium according to claim 1, further comprising one or more polymerizable compounds of formula M
R.sup.a—B.sup.1—(Z.sup.b—B.sup.2).sub.m—R.sup.b  M in which the individual radicals, on each occurrence identically or differently, and each, independently of one another, have the following meaning: R.sup.a, R.sup.b P, P-Sp-, H, F, Cl, Br, I, —CN, —NO.sub.2, —NCO, —NCS, —OCN, —SCN, —SF.sub.5 or C.sub.1-25-straight-chain or C.sub.3-25-branched alkyl, in which, in addition, one or more non-adjacent CH.sub.2 groups may each be replaced, independently of one another, by —C(R.sup.0)═C(R.sup.00)—, —C≡C—, —N(R.sup.00)—, —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O— in such a way that 0 and/or S atoms are not linked directly to one another, and in which, in addition, one or more H atoms may be replaced by F, Cl, Br, I, CN, P or P-Sp-, where, if B.sup.1 and/or B.sup.2 contain a saturated C atom, R.sup.a and/or R.sup.b may also denote a radical which is spiro-linked to this saturated C atom, wherein at least one of the radicals R.sup.a and R.sup.b denotes or contains a group P or P-Sp-, P a polymerizable group, Sp a spacer group or a single bond, B.sup.1, B.sup.2 an aromatic, heteroaromatic, alicyclic or heterocyclic group, which may also contain fused rings, and which is unsubstituted, or mono- or polysubstituted by L, Z.sup.m—O—, —S—, —CO—, —CO—O—, —OCO—, —O—CO—O—, —OCH.sub.2—, —CH.sub.2O—, —SCH.sub.2—, —CH.sub.2S—, —CF.sub.2O—, —OCF.sub.2—, —OF.sub.2S—, —SCF.sub.2—, —(CH.sub.2).sub.n1—, —CF.sub.2CH.sub.2—, —CH.sub.2CF.sub.2—, —(CF.sub.2).sub.n1—, —CH═CH—, —CF═CF—, —CH═CF—, —CF═CH—, —C≡C—, —CH═CH—COO—, —OCO—CH═CH—, —CH.sub.2CH.sub.2—CO—O—, O—CO—OH.sub.2—CH.sub.2—, —CR.sup.0R.sup.00— or a single bond, R.sup.0, R.sup.00 H or alkyl having 1 to 12 C atoms, m 0, 1, 2, 3 or 4, n1 1, 2, 3 or 4, L P, P-Sp-, OH, CH.sub.2OH, F, Cl, Br, I, —CN, —NO.sub.2, —NCO, —NCS, —OCN, —SCN, —C(═O)N(R.sup.x).sub.2, —C(═O)Y.sup.1, —C(═O)R.sup.x, —N(R.sup.x).sub.2, optionally substituted silyl, optionally substituted aryl having 6 to 20 C atoms, or C.sub.1-25-straight-chain or C.sub.3-25-branched alkyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy, in which, in addition, one or more H atoms may be replaced by F, Cl, P or P-Sp-, Y.sup.1 halogen, R.sup.x P, P-Sp-, H, halogen, C.sub.1-25-straight-chain, C.sub.3-25-branched or C.sub.3-25-cyclic alkyl, in which, in addition, one or more non-adjacent CH.sub.2 groups may be replaced by —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O— in such a way that O and/or S atoms are not linked directly to one another, and in which, in addition, one or more H atoms may be replaced by F, Cl, P or P-Sp-, an optionally substituted aryl or aryloxy group having 6 to 40 C atoms, or an optionally substituted heteroaryl or heteroaryloxy group having 2 to 40 C atoms.

14. The LC medium according to claim 1, further comprising one or more polymerizable compounds of the following formulae: ##STR00585## ##STR00586## ##STR00587## in which the individual radicals, on each occurrence identically or differently, and each, independently of one another, have the following meaning: P.sup.1, P.sup.2, P.sup.3 a polymerizable group, Sp.sup.1, Sp.sup.2, Sp.sup.3 a single bond or a spacer group where, in addition, one or more of the radicals P.sup.1-Sp.sup.1-, P.sup.2-Sp.sup.2- and P.sup.3-Sp.sup.3- may denote R.sup.aa, with the proviso that at least one of the radicals P.sup.1-Sp.sup.1-, P.sup.2-Sp.sup.2 and P.sup.3-Sp.sup.3- present is different from R.sup.aa, R.sup.aa H, F, Cl, CN or C.sub.1-25-straight-chain or C.sub.3-25-branched alkyl, in which, in addition, one or more non-adjacent CH.sub.2 groups may each be replaced, independently of one another, by —C(R.sup.0)═C(R.sup.00)—, —C≡C—, —N(R.sup.0)—, —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O— in such a way that O and/or S atoms are not linked directly to one another, and in which, in addition, one or more H atoms may be replaced by F, Cl, CN or P.sup.1-Sp.sup.1-, and wherein R.sup.aa does not denote or contain a group P.sup.1, P.sup.2 or P.sup.3, R.sup.0, R.sup.00 H or alkyl having 1 to 12 C atoms, R.sup.y and R.sup.z H, F, CH.sub.3 or CF.sub.3, X.sup.1, X.sup.2, X.sup.3—CO—O—, —O—CO— or a single bond, Z.sup.M1—O—, —CO—, —C(R.sup.yR.sup.z)— or —CF.sub.2CF.sub.2—, Z.sup.M2, Z.sup.M3—CO—O—, —O—CO—, —CH.sub.2O—, —OCH.sub.2—, —CF.sub.2O—, —OCF.sub.2— or —(CH.sub.2).sub.n—, where n is 2, 3 or 4, L F, Cl, CN or C.sub.1-12-straight-chain or C.sub.3-12-branched, optionally mono- or polyfluorinated alkyl, alkoxy, thioalkyl, alkenyl, alkynyl, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy, L′, L″ H, F or Cl, k 0 or 1, r 0, 1, 2, 3 or 4, s 0, 1, 2 or 3, t 0, 1 or 2, x 0 or 1.

15. A process of preparing an LC medium according to claim 4, comprising mixing one or more compounds of formula IA and IB with one or more polymerizable compounds of formula M
R.sup.a—B.sup.1—(Z.sup.b—B.sup.2).sub.m—R.sup.b  M in which the individual radicals, on each occurrence identically or differently, and each, independently of one another, have the following meaning: R.sup.a, R.sup.b P, P-Sp-, H, F, Cl, Br, I, —CN, —NO.sub.2, —NCO, —NCS, —OCN, —SCN, —SF.sub.5 or C.sub.1-25-straight-chain or C.sub.3-25-branched alkyl, in which, in addition, one or more non-adjacent CH.sub.2 groups may each be replaced, independently of one another, by —C(R.sup.0)═C(R.sup.00)—, —C≡C—, —N(R.sup.00)—, —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O— in such a way that O and/or S atoms are not linked directly to one another, and in which, in addition, one or more H atoms may be replaced by F, Cl, Br, I, CN, P or P-Sp-, where, if B.sup.1 and/or B.sup.2 contain a saturated C atom, R.sup.a and/or R.sup.b may also denote a radical which is spiro-linked to this saturated C atom, wherein at least one of the radicals R.sup.a and R.sup.b denotes or contains a group P or P-Sp-, P a polymerizable group, Sp a spacer group or a single bond, B.sup.1, B.sup.2 an aromatic, heteroaromatic, alicyclic or heterocyclic group, which may also contain fused rings, and which is unsubstituted, or mono- or polysubstituted by L, Z.sup.m—O—, —S—, —CO—, —CO—O—, —OCO—, —O—CO—O—, —OCH.sub.2—, —CH.sub.2O—, —SCH.sub.2—, —CH.sub.2S—, —CF.sub.2O—, —OCF.sub.2—, —CF.sub.2S—, —SCF.sub.2—, —(CH.sub.2).sub.n1—, —CF.sub.2CH.sub.2—, —CH.sub.2CF.sub.2—, —(CF.sub.2).sub.n1—, —CH═CH—, —CF═CF—, —CH═CF—, —CF═CH—, —C≡C—, —CH═CH—COO—, —OCO—CH═CH—, —CH.sub.2CH.sub.2—CO—O—, O—CO—CH.sub.2—CH.sub.2—, —CR.sup.0R.sup.00— or a single bond, R.sup.0, R.sup.00 H or alkyl having 1 to 12 C atoms, m 0, 1, 2, 3 or 4, n1 1, 2, 3 or 4, L P, P-Sp-, OH, CH.sub.2OH, F, Cl, Br, I, —CN, —NO.sub.2, —NCO, —NCS, —OCN, —SCN, —C(═O)N(R.sup.x).sub.2, —C(═O)Y.sup.1, —C(═O)R.sup.x, —N(R.sup.x).sub.2, optionally substituted silyl, optionally substituted aryl having 6 to 20 C atoms, or C.sub.1-25-straight-chain or C.sub.3-25-branched alkyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy, in which, in addition, one or more H atoms may be replaced by F, Cl, P or P-Sp-, Y.sup.1 halogen, R.sup.x P, P-Sp-, H, halogen, C.sub.1-25-straight-chain, C.sub.3-25-branched or C.sub.3-25-cyclic alkyl, in which, in addition, one or more non-adjacent CH.sub.2 groups may be replaced by —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O— in such a way that O and/or S atoms are not linked directly to one another, and in which, in addition, one or more H atoms may be replaced by F, Cl, P or P-Sp-, an optionally substituted aryl or aryloxy group having 6 to 40 C atoms, or an optionally substituted heteroaryl or heteroaryloxy group having 2 to 40 C atoms, and optionally with one or more further liquid-crystalline compounds and/or additives.

16. An LC display comprising an LC medium as defined in claim 1.

17. The LC display of claim 16, that is a PS-VA, PS-IPS, PS-FFS or SA-VA display.

18. The LC display of claim 16, comprising two substrates, at least one of which is transparent to light, an electrode provided on each substrate or two electrodes provided on only one of the substrates, and located between the substrates a layer of the LC medium, wherein the polymerizable compounds are polymerized between the substrates of the display by UV photopolymerization.

19. A process for the production of an LC display according to claim 18, comprising providing the LC medium between the substrates of the display, and exposing the LC medium to UV light causing photopolymerization of the polymerizable compounds, while a voltage is applied to the electrodes of the display at least for a part of the time of UV exposure.

20. The process according to claim 19, wherein the LC medium is exposed to UV light in a two-step process, including a first UV exposure where a voltage is applied to the electrodes, and a second UV exposure where no voltage is applied to the electrodes.

Description

EXAMPLES

[0458] The following examples explain the present invention without restricting it. However, they show the person skilled in the art preferred mixture concepts with compounds preferably to be employed and the respective concentrations thereof and combinations thereof with one another. In addition, the examples illustrate which properties and property combinations are accessible.

[0459] In addition, the following abbreviations and symbols are used: [0460] V.sub.0 threshold voltage, capacitive [V] at 20° C., [0461] n.sub.e extraordinary refractive index at 20° C. and 589 nm, [0462] n.sub.0 ordinary refractive index at 20° C. and 589 nm, [0463] Δn optical anisotropy at 20° C. and 589 nm, [0464] ε.sub.⊥ dielectric permittivity perpendicular to the director at 20° C. and 1 kHz, [0465] ε.sub.∥ dielectric permittivity parallel to the director at 20° C. and 1 kHz, [0466] Δε dielectric anisotropy at 20° C. and 1 kHz, [0467] cl.p., T(N,I) clearing point [° C.], [0468] γ.sub.1 rotational viscosity at 20° C. [mPa.Math.s], [0469] K.sub.1 elastic constant, “splay” deformation at 20° C. [pN], [0470] K.sub.2 elastic constant, “twist” deformation at 20° C. [pN], [0471] K.sub.3 elastic constant, “bend” deformation at 20° C. [pN].

[0472] Unless explicitly noted otherwise, all concentrations in the present application are quoted in percent by weight and relate to the corresponding mixture as a whole, comprising all solid or liquid-crystalline components, without solvents.

[0473] Unless explicitly noted otherwise, all temperature values indicated in the present application, such as, for example, for the melting point T(C,N), the transition from the smectic (S) to the nematic (N) phase T(S,N) and the clearing point T(N,I), are quoted in degrees Celsius (° C.). M.p. denotes melting point, cl.p.=clearing point. Furthermore, C=crystalline state, N=nematic phase, S=smectic phase and I=isotropic phase. The data between these symbols represent the transition temperatures.

[0474] All physical properties are and have been determined in accordance with “Merck Liquid Crystals, Physical Properties of Liquid Crystals”, Status November 1997, Merck KGaA, Germany, and apply for a temperature of 20° C., and Δn is determined at 589 nm and Δε at 1 kHz, unless explicitly indicated otherwise in each case.

[0475] The term “threshold voltage” for the present invention relates to the capacitive threshold (V.sub.0), also known as the Freedericks threshold, unless explicitly indicated otherwise. In the examples, the optical threshold may also, as generally usual, be quoted for 10% relative contrast (V.sub.10).

[0476] Unless stated otherwise, the process of polymerizing the polymerizable compounds in the PSA displays as described above and below is carried out at a temperature where the LC medium exhibits a liquid crystal phase, preferably a nematic phase, and most preferably is carried out at room temperature.

[0477] Unless stated otherwise, methods of preparing test cells and measuring their electrooptical and other properties are carried out by the methods as described hereinafter or in analogy thereto.

[0478] The PSVA display or PSVA test cell used for photopolymerization and measurement of the tilt angles etc. consists of two plane-parallel glass outer plates at a separation of 3-4 μm unless stated otherwise, each of which has on the inside an electrode layer and a polyimide alignment layer on top, where the two polyimide layers are rubbed antiparallel to one another and effect a homeotropic edge alignment of the liquid-crystal molecules. The SAVA display or test cell has the same structure but wherein one or both polyimide layers are omitted.

[0479] The polymerizable compounds are polymerized in the display or test cell by irradiation with UV light of defined intensity for a prespecified time, with a voltage simultaneously being applied to the display (usually 10 V to 30 V alternating current, 1 kHz).

[0480] The tilt angle is determined using the Mueller Matrix Polarimeter “AxoScan” from Axometrics. A low value (i.e. a large deviation from the 90° angle) corresponds to a large tilt here.

[0481] Unless stated otherwise, the term “tilt angle” means the angle between the LC director and the substrate, and “LC director” means in a layer of LC molecules with uniform orientation the preferred orientation direction of the optical main axis of the LC molecules, which corresponds, in case of calamitic, uniaxially positive birefringent LC molecules, to their molecular long axis.

Comparison Example 1

[0482] The nematic LC host mixture Cl is formulated as follows

TABLE-US-00007 B(S)-2O-O5  2.00% cl.p. 74.5° C. BCH-32  9.50% Δn 0.1052 CC-3-V1  6.50% Δε −3.2 CCH-301  8.50% ε.sub.|| 3.7 CCH-34  3.00% γ.sub.1 94 mPa .Math. s CCP-3-1  9.50% K.sub.1 12.6 CCY-3-O1  6.50% K.sub.3 14.9 CCY-5-O2  9.50% γ.sub.1/K.sub.1 6.31 CLY-3-O2  1.00% V.sub.0 2.29 V CPY-3-O2  5.50% CY-3-O2 15.50% PCH-301  5.00% PCH-302  6.50% PY-2-O2 11.50%

[0483] The mixture does not contain a dopant of formula IA.

Example 1

[0484] The nematic LC host mixture N1 is formulated as follows

TABLE-US-00008 B(S)-2O-O5  2.00% cl.p. 74.3° C. BCH-32  9.50% Δn 0.1057 CC-3-V1  6.50% Δε −3.2 CCH-301  8.50% ε.sub.|| 3.6 CCH-34  3.00% γ.sub.1 95 mPa .Math. s CCP-3-1  9.30% K.sub.1 12.6 CCY-3-O1  6.50% K.sub.3 14.9 CCY-5-O2  9.50% γ.sub.1/K.sub.1 6.38 CLY-3-O2  1.00% V.sub.0 2.29 V CPY-3-O2  5.50% CY-3-O2 15.50% PCH-301  5.00% PCH-302  6.50% PY-2-O2 11.50% PYP-2-3  0.20%

[0485] The mixture contains 0.2% of the dopant PYP-2-3 of formula IA2, and shows almost the same low viscosity, low threshold voltage and low ratio γ.sub.1/K.sub.3 as the mixture C1.

[0486] Polymerizable Mixtures

[0487] Polymerizable comparison mixture PC1 is prepared by adding 0.35% of the polymerizable compound RM-1 and 0.005% of the stabiliser S1 to the nematic LC host mixture C1.

[0488] Polymerizable mixture P1 according to the invention is prepared by adding 0.35% of the polymerizable compound RM-1 and 0.005% of the stabiliser S1 to the nematic LC host mixture N1.

##STR00552##

[0489] The polymerizable mixtures are filled into test cells and exposed to UV light in a two step process, the first step (UV1) for generating a tilt angle and the second step (UV2) for polymerizing any residual monomer that was not polymerized in the first step. In UV1 step a voltage is applied (20 V.sub.pp square wave, 200 Hz). In UV2 step no voltage is applied. The lamps were equipped with a cut-off filter of 313 nm. The other conditions are as follows, unless stated otherwise:

UV1 (UV Fe-I lamp): 0.53 mW/cm.sup.2 at 40° C. for 40-190 s
UV2 (UV C-type lamp): 0.28 mW/cm.sup.2 at RT for 60-120 min

Tilt Angle

[0490] The test cells were given at least 12 hours to relax before the final tilt angle was measured and calculated with an Axometrics AxoScan®. The results are shown in Table 1.

TABLE-US-00009 TABLE 1 Tilt angle Mixture PC1 P1 Tilt angle (°) after 100 s 1.16 0.99 Tilt angle (°) after 130 s 2.65 2.62 Tilt angle (°) after 160 s 3.85 3.93 Tilt angle (°) after 190 s 5.00 5.01

[0491] It can be seen that the tilt angle generated in polymerizable mixture P1 according to the invention is as good as in the reference mixture PC1.

Tilt Stability

[0492] Tilt stability, i.e. the change of the tilt angle after repeated electric stress, is a criterion for evaluating the risk of image sticking. A low value for the change of the tilt angle indicates a high tilt stability and a low potential risk of image sticking.

[0493] For determining the tilt stabillity the test cells after polymerization as described above are electrically stressed with a square wave of 60V.sub.PP at 200 Hz for 72 h. After a relaxation time of 5-10 min the tilt angles are measured using the Otsuka T_RETS-10 system.

[0494] The change of the tilt angle Δtilt is determined according to equation (1)

tilt.sub.after stress−tilt.sub.after tilt generation=Δtilt  (1)

and is shown in Table 2 below.

[0495] The lower the value of Δtilt, the higher is the tilt stability.

TABLE-US-00010 TABLE 2 Tilt Stability Mixture Δtilt/° PC1 0.17 P1 0.17

[0496] From Table 2 it can be seen that polymerizable mixture P1 according to the invention shows a tilt stability as good as in reference mixture PC1.

VHR

[0497] The VHR of the polymerizable mixtures was measured with a TOYO 6254 equipment at 60° C. in VA-VHR test cells at 1V and 0.6 Hz before and after UV exposure for 60 min under the conditions of UV2 step as described above.

[0498] Light stress usually causes the decrease of VHR in LC mixtures, therefore the smaller the absolute decrease of VHR value after stress, the better performance for display applications.

[0499] The results are shown in Table 3.

TABLE-US-00011 TABLE 3 VHR VHR (%) VHR (%) Mixture Initial after 60 min UV load PC1 96.5 92.4 P1 96.6 92.5

[0500] From Table 3 it can be seen that the VHR values of the polymerizable mixture P1 according to the invention are as high as for the reference mixture PC1.

Residual RM

[0501] The residual content of unpolymerized RM (in % by weight) in the mixture was determined after UV photopolymerization. The smaller the residual RM content after a given time interval, the faster the polymerization. For this purpose the polymerizable mixtures were filled in test cells and polymerized by UV exposure for varying time under the conditions of UV2 step as described above.

[0502] After photopolymerization the test cells were opened, and the mixture was dissolved and rinsed out of the test cell with methyl ethyl ketone and analyzed by Ultra Performance Liquid Chromatography (UPLC).

[0503] The results are shown in Table 4.

TABLE-US-00012 TABLE 4 Residual RM Mixture PC1 P1 RM % Initial 0.3500 0.3500 RM % 40 min 0.0247 0.0193 RM % 50 min 0.0190 0.0138 RM % 60 min 0.0136 0.0098 RM % 100 min 0.0067 0.0048

[0504] It can be seen that the residual RM content after UV2 step in mixture P1 according to the invention is significantly lower after a given time compared to the reference mixture PC1. This does also mean that in mixture P1 the time needed for achieving a similar low residual RM amount as in mixture PC1 is significantly reduced. This can be seen for example when comparing the time needed to achieve a residual RM concentration of ca. 0.014%, which is 50 min in mixture P1 as compared to 60 min in mixture PC1.

[0505] In conclusion, the above results demonstrate that the addition of a small amount of a dopant of formula IA to a polymerizable LC medium comprising a compound of formula IB enables a significant reduction of the UV2 step time, while maintaining advantageous physical properties like a low viscosity, a low threshold voltage and a low ratio γ.sub.1/K.sub.3, and keeping the tilt generation, tilt stability and VHR at the desired high level.

Example 2

[0506] The nematic LC host mixture N2 is formulated as follows

TABLE-US-00013 B(S)-2O-O4 3.00% cl.p. 74.7° C. B(S)-2O-O5 5.00% BCH-32 7.00% CC-3-V 29.50% CC-3-V1 9.00% CCP-3-1 10.80% CCP-3-3 2.00% CLY-3-O2 2.00% CPY-2-O2 6.50% CPY-3-O2 5.50% PY-1-O2 10.50% PY-2-O2 9.00% PYP-2-3 0.20%

[0507] Polymerizable mixture P2 is prepared by adding 0.3% of polymerizable compound RM-1 and 0.01% of stabiliser S1-1 to nematic LC host mixture N2.

Example 3

[0508] The nematic LC host mixture N3 is formulated as follows

TABLE-US-00014 B(S)-2O-O4 3.50% cl.p. 74.7° C. B(S)-2O-O5 5.00% BCH-32 7.50% CC-3-V 29.50% CC-3-V1 5.50% CCP-3-1 6.90% CCP-V-1 11.50% CLY-3-O2 5.00% CPY-2-O2 4.00% CPY-3-O2 10.00% PY-1-O2 0.50% PY-2-O2 11.00% PYP-2-3 0.10%

[0509] Polymerizable mixture P3 is prepared by adding 0.3% of polymerizable compound RM-1 and 0.01% of stabiliser S1-1 to nematic LC host mixture N3.

Example 4

[0510] The nematic LC host mixture N4 is formulated as follows

TABLE-US-00015 B(S)-2O-O4 4.00% cl.p. 74.7° C. B(S)-2O-O5 5.00% CC-3-V 28.20% CC-3-V1 8.00% CCP-3-1 3.70% CCP-V-1 10.60% CPY-2-O2 7.80% CPY-3-O2 12.00% PP-1-2V1 7.60% PY-1-O2 10.00% PY-3-O2 3.00% PYP-2-3 0.10%

[0511] Polymerizable mixture P4 is prepared by adding 0.35% of polymerizable compound RM-17 and 0.015% of stabiliser S1-1 to nematic LC host mixture N4.

##STR00553##

Example 5

[0512] The nematic LC host mixture N5 is formulated as follows

TABLE-US-00016 B(S)-2O-O4 4.50% cl.p. 75.1° C. B(S)-2O-O5 5.00% B(S)-2O-O6 2.00% CC-3-V 29.80% CC-4-V1 17.50% CLY-3-O2 8.00% CPY-2-O2 10.00% CPY-3-O2 10.00% PY-1-O2 3.00% PY-2-O2 10.00% PYP-2-3 0.20%

[0513] Polymerizable mixture P5 is prepared by adding 0.3% of polymerizable compound RM-1 and 0.015% of stabiliser S1-1 to nematic LC host mixture N5.

Example 6

[0514] The nematic LC host mixture N6 is formulated as follows

TABLE-US-00017 B(S)-2O-O4 4.50% cl.p. 75.7° C. B(S)-2O-O5 5.00% BCH-32 6.00% CC-3-V 29.70% CC-3-V1 8.00% CCY-3-O1 7.50% CCY-3-O2 11.00% CLY-3-O2 8.00% PY-1-O2 10.50% PY-2-O2 9.50% PYP-2-3 0.30%

[0515] Polymerizable mixture P6 is prepared by adding 0.3% of polymerizable compound RM-1 and 0.01% of stabiliser S2-1 to nematic LC host mixture N6.

##STR00554##

Example 7

[0516] Polymerizable mixture P7 is prepared by adding 0.3% of polymerizable compound RM-35 and 0.015% of stabiliser S1-1 to nematic LC host mixture N1.

##STR00555##

Example 8

[0517] Polymerizable mixture P8 is prepared by adding 0.3% of polymerizable compound RM-64 and 0.01% of stabiliser S1-1 to nematic LC host mixture N1.

##STR00556##

Example 9

[0518] Polymerizable mixture P9 is prepared by adding 0.2% of polymerizable compound RM-120 and 0.01% of stabiliser S1-1 to nematic LC host mixture N1.

##STR00557##

Example 10

[0519] Polymerizable mixture P10 is prepared by adding 0.3% of polymerizable compound RM-1, 0.2% of polymerizable compound RM-120 and 0.01% of stabiliser S1-1 to nematic LC host mixture N1.

Example 11

[0520] Polymerizable mixture P11 is prepared by adding 0.35% of polymerizable compound RM-1 and 0.01% of stabiliser S3-1 to nematic LC host mixture N2.

##STR00558##

Example 12

[0521] Polymerizable mixture P12 is prepared by adding 0.3% of polymerizable compound RM-1, 0.2% of polymerizable compound RM-35 and 0.01% of stabiliser S2-1 to nematic LC host mixture N2.

Example 13

[0522] Polymerizable mixture P13 is prepared by adding 0.2% of polymerizable compound RM-145 and 0.01% of stabiliser S1-1 to nematic LC host mixture N1.

##STR00559##

Example 14

[0523] Polymerizable mixture P14 is prepared by adding 0.2% of polymerizable compound RM-142 and 0.01% of stabiliser S1-1 to nematic LC host mixture N1.

##STR00560##

Example 11-1

[0524] Polymerizable mixture P11-1 is prepared by adding 0.2% of polymerizable compound RM-150 and 0.01% of stabiliser S2-1 to nematic LC host mixture N1.

##STR00561##

Example 12-1

[0525] Polymerizable mixture P12-1 is prepared by adding 0.2% of polymerizable compound RM-156 and 0.01% of stabiliser S1-1 to nematic LC host mixture N3.

##STR00562##

Example 13-1

[0526] Polymerizable mixture P13-1 is prepared by adding 0.35% of polymerizable compound RM-164 and 0.01% of stabiliser S1-1 to nematic LC host mixture

##STR00563##

Example 14-1

[0527] Polymerizable mixture P14-1 is prepared by adding 0.35% of polymerizable compound RM-165 and 0.01% of stabiliser S1-1 to nematic LC host mixture N1.

##STR00564##

Example 15

[0528] Polymerizable mixture P15 is prepared by adding 0.3% of polymerizable compound RM-164, 0.2% of polymerizable compound RM-1 and 0.01% of stabiliser S2-1 to nematic LC host mixture N1.

Example 16

[0529] Polymerizable mixture P16 is prepared by adding 0.35% of polymerizable compound RM-164, 0.2% of polymerizable compound RM-64 and 0.015% of stabiliser S1-1 to nematic LC host mixture N2.

Example 17

[0530] Polymerizable mixture P17 is prepared by adding 0.3% of polymerizable compound RM-162 and 0.01% of stabiliser S1-1 to nematic LC host mixture N1.

##STR00565##

Example 18

[0531] Polymerizable mixture P18 is prepared by adding 0.35% of polymerizable compound RM-1 and 0.01% of stabiliser S3-2 to nematic LC host mixture N4.

##STR00566##

Example 19

[0532] Polymerizable mixture P19 is prepared by adding 0.35% of polymerizable compound RM-35 and 0.01% of stabiliser S3-3 to nematic LC host mixture N5.

##STR00567##

Example 20

[0533] Polymerizable mixture P20 is prepared by adding 0.35% of compound RM-1, 0.15% of compound RM-35 and 0.005% of stabiliser S1-1 to nematic LC host mixture N1.

Example 21

[0534] The nematic LC host mixture N8 is formulated as follows

TABLE-US-00018 B(S)-2O-O4 4.00% cl.p. 74.8° C. B(S)-2O-O5 5.00% BCH-32 7.00% CC-3-V1 8.00% CC-4-V1 10.70% CCH-34 8.00% CCH-35 6.00% CCY-3-O2 11.00% CPY-2-O2 3.00% CPY-3-O2 5.00% CY-3-O2 15.00% PCH-302 5.00% PPGU-3-F 1.00% PY-1-O2 4.00% PY-2-O2 7.00% PYP-2-3 0.30%

[0535] Polymerizable mixture P21 is prepared by adding 0.2% of compound RM-165, 0.2% of compound RM-64 and 0.015% of stabiliser S2-1 to the nematic LC host mixture N8.

Example 22

[0536] The nematic LC host mixture N9 is formulated as follows

TABLE-US-00019 B(S)-2O-O4 2.00% cl.p. 73.8° C. B(S)-2O-O5 2.50% BCH-32 8.00% CC-3-V 30.00% CC-4-V1 7.00% CCP-3-1 10.90% CLY-3-O2 3.00% CPY-2-O2 2.00% CPY-3-O2 12.00% PY-1-O2 11.50% PY-2-O2 11.00% PYP-2-3 0.10%

[0537] Polymerizable mixture P22 is prepared by adding 0.3% of compound RM-164, 0.2% of compound RM-1 and 0.6% of the SA additive SA23 to the nematic LC host mixture N9.

##STR00568##

Example 23

[0538] The nematic LC host mixture N10 is formulated as follows

TABLE-US-00020 B(S)-2O-O4 4.50% cl.p. 75.8° C. B(S)-2O-O5 3.00% CC-3-V 50.70% CCP-3-1 1.00% CLY-3-O2 9.00% CPY-2-O2 10.00% CPY-3-O2 12.00% PY-1-O2 9.50% PYP-2-3 0.30%

[0539] Polymerizable mixture P23 is prepared by adding 0.3% of compound RM-164, 0.2% of compound RM-156, 0.05% of compound RM-120 and 0.01% of stabiliser S1-1 to nematic LC host mixture N10.

Example 24

[0540] Polymerizable mixture P24 is prepared by adding 0.2% of compound RM-1, 0.3% of compound RM-156 and 0.015% of stabiliser S2-1 to nematic LC host mixture N1.

Example 25

[0541] Polymerizable mixture P25 is prepared by adding 0.3% of compound RM-1, 0.2% of compound RM-35, 0.1% of compound RM-120 and 0.015% of stabiliser S1-1 to nematic LC host mixture N1.

Example 26

[0542] The nematic LC host mixture N11 is formulated as follows

TABLE-US-00021 CCP-3-1 3.80% cl.p. 93.3° C. CCP-V-1 11.00% CLY-2-O4 4.00% CLY-3-O2 5.00% CLY-3-O3 5.00% CLY-4-O2 4.00% CLY-5-O2 3.00% CPY-3-O2 5.00% COB(S)-2-O4 9.00% B(S)-2O-O1(c5) 4.50% CC-3-V1 7.50% CC-4-V1 18.50% CC-2-3 9.70% Y-4O-O4 9.50% CCQU-3-F 0.30% PYP-2-3 0.20%

[0543] Polymerizable mixture P26 is prepared by adding 0.1% of compound RM-1, 0.3% of compound RM-35 and 0.01% of stabiliser S1-1 to nematic LC host mixture N11.

Example 27

[0544] Polymerizable mixture P27 is prepared by adding 0.3% of compound RM-164, 0.2% of compound RM-156 and 0.005% of stabiliser S1-1 to nematic LC host mixture N2.

Example 28

[0545] The nematic LC host mixture N12 is formulated as follows

TABLE-US-00022 B(S)-2O-O5 2.00% cl.p. 74.1° C. BCH-32 9.50% CC-3-V1 6.50% CCH-301 8.50% CCH-34 3.00% CCP-3-1 9.30% CCY-3-O1 6.50% CCY-5-O2 9.50% CLY-3-O2 1.00% CPY-3-O2 5.50% CY-3-O2 15.50% PCH-301 5.00% PCH-302 6.50% PY-2-O2 11.50% PYP-(c3)-3 0.20%

[0546] Polymerizable mixture P28 is prepared by adding 0.3% of compound RM-164 and 0.005% of stabiliser S1-1 to nematic LC host mixture N12.

Example 29

[0547] The nematic LC host mixture N13 is formulated as follows

TABLE-US-00023 B(S)-2O-O4 0.25% cl.p. 74.8° C. BCH-32 4.50% CC-3-V1 12.80% CCH-23 15.00% CCH-301 1.00% CCH-34 2.00% CCH-35 0.50% CCY-3-O2 6.50% CPY-2-O2 12.00% CPY-3-O2 15.00% CY-3-O2 15.50% CY-3-O4 0.25% PCH-301 13.00% PP-1-2V1 0.50% PYP-2-3 0.20%

[0548] Polymerizable mixture P29 is prepared by adding 0.3% of compound RM-1, 0.2% of compound RM-165 and 0.0150% of stabiliser S2-1 to nematic LC host mixture N13.

Example 30

[0549] The nematic LC host mixture N14 is formulated as follows

TABLE-US-00024 CCP-3-1  3.80% cl.p. 90.8° C. CCP-V-1 13.00% CLY-2-O4  4.00% CLY-3-O2  5.50% CLY-3-O3  5.00% CLY-4-O2  4.00% CLY-(c3)2-O2  4.00% CPY-3-O2  5.00% COB(S)-2-O4  3.00% B(S)-2O-O5  5.00% B(S)-2O-O6  4.00% CC-3-V1  8.00% CC-4-V1 16.00% CC-2-3  9.70% Y-4O-O4  9.50% CCQU-3-F  0.30% PYP-2-3  0.20%

[0550] Polymerizable mixture P30 is prepared by adding 0.3% of compound RM-164 and 0.005% of stabiliser S1-1 to nematic LC host mixture N14.

Example 31

[0551] Polymerizable mixture P31 is prepared by adding 0.3% of compound RM-165, 0.2% of compound RM-142 and 0.01% of stabiliser S2-1 to nematic LC host mixture N2.

Example 32

[0552] The nematic LC host mixture N15 is formulated as follows

TABLE-US-00025 B(S)-2O-O5  0.25% cl.p. 74.3° C. BCH-32  5.50% CC-3-V 10.00% CC-3-V1  7.50% CC-4-V1 16.50% CCH-35  0.25% CCP-3-1  7.30% CCY-3-O2 11.00% CCY-3-O3  1.00% CCY-4-O2  7.00% CCY-5-O2  2.00% CY-3-O2  9.00% PY-1-O2  9.00% PY-2-O2  9.00% PY-3-O2  4.50% PYP-2-(c5)  0.20%

[0553] Polymerizable mixture P32 is prepared by adding 0.4% of compound RM-164 and 0.015% of stabiliser S1-1 to nematic LC host mixture N15.

Example 33

[0554] The nematic LC host mixture N16 is formulated as follows

TABLE-US-00026 B(S)-2O-O5  2.00% cl.p. 74.3° C. BCH-32  9.50% CC-3-V1  6.50% CCH-301  8.50% CCH-34  3.00% CCP-3-1  9.30% CCY-3-O1  6.50% CCY-5-O2  9.50% CLY-3-O2  1.00% CPY-3-O2  5.50% CY-3-O2 15.50% PCH-301  5.00% PCH-302  6.50% PY-2-O2 11.50% PYP-2-(c5)  0.20%

[0555] Polymerizable mixture P33 is prepared by adding 0.3% of compound RM-1 and 0.01% of stabiliser S1-1 to nematic LC host mixture N16.

Example 34

[0556] Polymerizable mixture P34 is prepared by adding 0.3% of compound RM-165, 0.2% of compound RM-150 and 0.015% of stabiliser S1-1 to nematic LC host mixture N2.

Example 35

[0557] The nematic LC host mixture N17 is formulated as follows

TABLE-US-00027 B(S)-2O-O4  4.50% cl.p. 75.1° C. B(S)-2O-O5  5.00% B(S)-2O-O6  2.00% CC-3-V 29.80% CC-4-V1 17.50% CLY-3-O2  8.00% CPY-2-O2 10.00% CPY-3-O2 10.00% PY-1-O2  3.00% PY-2-O2 10.00% PYP-2-3  0.20%

[0558] Polymerizable mixture P35 is prepared by adding 0.2% of compound RM-1, 0.25% of compound RM-35 and 0.005% of stabiliser S1-1 to nematic LC host mixture N17.

Example 36

[0559] Polymerizable mixture P36 is prepared by adding 0.3% of compound RM-1, 0.3% of compound R-35 and 0.6% of the SA additive SA32 to the nematic LC host mixture N2.

##STR00569##

Example 37

[0560] The nematic LC host mixture N18 is formulated as follows

TABLE-US-00028 B(S)-2O-O4  4.00% cl.p. 75.4° C. B(S)-2O-O5  5.00% CC-3-V 28.20% CC-3-V1  8.00% CCP-3-1  3.70% CCP-V-1 10.60% CPY-2-O2  7.80% CPY-3-O2 12.00% PP-1-2V1  7.60% PY-1-O2 10.00% PY-3-O2  3.00% PYP-2-KC3)  0.10%

[0561] Polymerizable mixture P37 is prepared by adding 0.35% of polymerizable compound RM-164 and 0.015% of stabiliser S1-1 to nematic LC host mixture N18.

Example 38

[0562] Polymerizable mixture P38 is prepared by adding 0.3% of compound RM-1, 0.2% of compound RM-35 and 0.015% of stabiliser S1-1 to nematic LC host mixture N3.

Example 39

[0563] Polymerizable mixture P39 is prepared by adding 0.3% of compound RM-1, 0.4% of compound RM-164 and 0.6% of the SA additive SA23 to the nematic LC host mixture N3.

Example 40

[0564] Polymerizable mixture P40 is prepared by adding 0.4% of compound RM-1, 0.2% of compound RM-35, 0.6% of the SA additive SA23 and 0.015% of stabiliser S3-3 to the nematic LC host mixture N3.

Example 41

[0565] Polymerizable mixture P41 is prepared by adding 0.3% of compound RM-1, 013% of compound RM-120, 0.6% of the SA additive SA23 and 0.015% of stabiliser S1-1 to nematic LC host mixture N2.

Example 42

[0566] The nematic LC host mixture N19 is formulated as follows

TABLE-US-00029 B(S)-2O-O4  4.50% cl.p. 74.7° C. B(S)-2O-O5  5.00% B(S)-2O-O6  2.00% CC-3-V 29.80% CC-4-V1 17.50% CLY-3-O2  8.00% CPY-2-O2 10.00% CPY-3-O1(c3) 10.00% PY-1-O2  3.00% PY-2-O2 10.00% PYP-2-3  0.20%

[0567] Polymerizable mixture P42 is prepared by adding 0.2% of compound RM-1, 0.2% of compound RM-156 and 0.015% of stabiliser S3-3 to nematic LC host mixture N19.

Example 43

[0568] The nematic LC host mixture N30 is formulated as follows

TABLE-US-00030 B(S)-2O-O4  4.00% cl.p. 75.5 B(S)-2O-O5  5.00% CC-3-V 28.20% CC-3-V1  8.00% CCP-3-1  3.70% CCP-V-1 10.60% CPY-2-O2  7.80% CPY-3-O2  6.00% CPY-(c5)-O2  6.00% PP-1-2V1  7.60% PY-1-O2 10.00% PY-3-O2  3.00% PYP-2-3  0.10%

[0569] Polymerizable mixture P43 is prepared by adding 0.2% of compound RM-1, 0.1% of compound RM-142 and 0.015% of stabiliser S2-1 to nematic LC host mixture N30.

Example 44

[0570] The nematic LC host mixture N31 is formulated as follows

TABLE-US-00031 CY-5-O2 11.00% cl.p. 60° C. PY-3-O2  9.00% COY-3-O2 17.00% B(S)-(c5)1O-O4  4.00% PP-1-5 10.00% CC-3-V1 26.00% CCH-32  5.00% CCP-3-1 11.80% BCH-32  6.00% PYP-2-3  0.20%

[0571] Polymerizable mixture P44 is prepared by adding 0.4% of compound RM-165 and 0.01% of stabiliser S2-1 to nematic LC host mixture N31.

Example 45

[0572] Polymerizable mixture P45 is prepared by adding 0.2% of compound RM-64, 0.3% of compound RM-165 and 0.015% of stabiliser S3-2 to nematic LC host mixture N3.

Example 46

[0573] The nematic LC host mixture N32 is formulated as follows

TABLE-US-00032 CCP-3-1  3.80% cl.p. 90.8° C. CCP-V-1 13.00% CLY-2-O4  4.00% CLY-3-O2  5.50% CLY-3-O3  5.00% CLY-4-O2  4.00% CLY-5-O2  4.00% CPY-3-O2  5.00% COB(S)-2-O1(c3)  3.00% B(S)-2O-O5  5.00% B(S)-2O-O6  4.00% CC-3-V1  8.00% CC-4-V1 16.00% CC-2-3  9.70% Y-4O-O4  9.50% CCQU-3-F  0.30% PYP-2-3  0.20%

[0574] Polymerizable mixture P46 is prepared by adding 0.3% of compound RM-1, 0.2% of compound RM-164 and 0.015% of stabiliser S1-1 to nematic LC host mixture N32.

Example 47

[0575] The nematic LC host mixture N33 is formulated as follows

TABLE-US-00033 B(S)-(c5)1O-O2  2.00% cl.p. 74.1° C. BCH-32  9.50% CC-3-V1  6.50% CCH-301  8.50% CCH-34  3.00% CCP-3-1  9.30% CCY-3-O1  6.50% CCY-5-O2  9.50% CLY-3-O2  1.00% CPY-3-O2  5.50% CY-3-O2 15.50% PCH-301  5.00% PCH-302  6.50% PY-2-O2 11.50% PYP-(c3)-3  0.20%

[0576] Polymerizable mixture P47 is prepared by adding 0.3% of compound RM-1, and 0.015% of stabiliser S3-1 to nematic LC host mixture N33.

Example 48

[0577] The nematic LC host mixture N34 is formulated as follows

TABLE-US-00034 B(S)-2O-O5  2.00% cl.p. 74.3° C. BCH-32  9.50% CC-3-V1  6.50% CCH-301  8.50% CCH-34  3.00% CCP-3-1  9.30% CCY-3-O1  6.50% CCY-5-O2  9.50% CLY-(c3)2-O2  1.00% CPY-3-O2  5.50% CY-3-O2 15.50% PCH-301  5.00% PCH-302  6.50% PY-2-O2 11.50% PYP-2-3  0.20%

[0578] Polymerizable mixture P48 is prepared by adding 0.3% of compound RM-1, and 0.015% of stabiliser S3-1 to nematic LC host mixture N34.

Example 49

[0579] The nematic LC host mixture N35 is formulated as follows

TABLE-US-00035 B(S)-2O-O4  4.00% cl.p. 74.8° C. COB(S)-2-O4  5.00% CCP-3-1  7.80% CCY-3-O2 10.50% CLY-3-O2  1.00% CPY-3-O2  2.00% CC-3-V1  8.00% CC-4-V1 16.00% CCH-34  7.00% CCH-35  9.00% CY-3-O2  4.00% PCH-302  4.50% PY-1-O2 11.00% PY-2-O2 10.00% PYP-2-3  0.20%

[0580] Polymerizable mixture P49 is prepared by adding 0.3% of compound RM-164 and 0.015% of stabiliser S1-1 to nematic LC host mixture N35.

Example 50

[0581] The nematic LC host mixture N36 is formulated as follows

TABLE-US-00036 B(S)-2O-O5  4.00% cl.p. 74.4° C. COB(S)-2-O1(c3)  5.00% CCP-3-1  6.80% CCY-3-O2 10.50% CLY-3-O2  1.00% CPY-3-O2  3.00% CC-3-V1  8.00% CC-4-V1 16.00% CCH-34  7.00% CCH-35  9.00% CY-3-O2  4.00% PCH-302  4.50% PY-1-O2 11.00% PY-2-O2 10.00% PYP-2-3  0.20%

[0582] Polymerizable mixture P50 is prepared by adding 0.3% of compound RM-1, 0.2% of compound RM-35 and 0.01% of stabiliser S2-1 to nematic LC host mixture N36.

Example 51

[0583] The nematic LC host mixture N37 is formulated as follows

TABLE-US-00037 B(S)-2O-O6  4.00% cl.p. 73.8° C. COB(S)-2-O4  5.00% CCP-3-1  6.70% CCY-3-O2 10.50% CLY-(c3)2-O2  1.00% CPY-3-O2  3.00% CC-3-V1  8.00% CC-4-V1 16.00% CCH-34  7.00% CCH-35  9.00% CY-3-O2  4.00% PCH-302  4.50% PY-1-O2 11.00% PY-2-O2 10.00% PYP-2-3  0.30%

[0584] Polymerizable mixture P51 is prepared by adding 0.4% of compound RM-1, 0.2% of compound RM-156 and 0.01% of stabiliser S2-1 to nematic LC host mixture N37.

Example 52

[0585] The nematic LC host mixture N38 is formulated as follows

TABLE-US-00038 B(S)-2O-O4  4.00% cl.p. 74.3° C. B(S)-2O-O5  5.00% CCP-3-1  8.20% CCY-3-O2  8.00% CLY-3-O2  1.00% CPY-3-O2  6.00% CC-3-V1  8.00% CC-4-V1 16.00% CCH-34  8.00% CCH-35  7.50% CY-3-O2  6.50% PCH-302  5.00% PY-1-O2  8.00% PY-2-O2  8.50% PYP-2-1(c3)  0.30%

[0586] Polymerizable mixture P52 is prepared by adding 0.3% of compound RM-1 and 0.015% of stabiliser S1-1 to nematic LC host mixture N38.

[0587] Without further elaboration, it is believed that one skilled in the art can, using the preceding description, utilize the present invention to its fullest extent. The preceding preferred specific embodiments are, therefore, to be construed as merely illustrative, and not limitative of the remainder of the disclosure in any way whatsoever.

[0588] The entire disclosures of all applications, patents and publications, cited herein and of corresponding application No. CN 202210113187.0, filed Jan. 30, 2022 are incorporated by reference herein.