Patent ID: 11920074
Assignee: MERCK PATENT GMBH
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C  G

Claim 0:
1. A liquid crystal medium comprising one or more compounds selected from formulae I-1 and I-2, , in which
RL1 denotes H, or a straight chain alkyl or alkoxy radical having 1 to 15 C atoms or branched alkyl or alkoxy radical having 3 to 15 C atoms, where one or more CH2 groups in these radicals may each be replaced, independently of one another, by, , —C═C—, —CF2O—, —OCF2—, —CH═CH—, —O—, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another, and in which, in addition, one or more H atoms may each be replaced by halogen,
and
one or more compounds selected from the group of compounds of the formulae IIA, IIB, IIC and IID,, , in which
R2A, R2B, R2C 
and R2D each, independently of one another, denote H, or an alkyl radical having 1 to 15 C atoms or an alkenyl radical having 2 to 15 C atoms which, in each case, is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, where, in addition, one or more CH2 groups in these radicals may each be replaced by —O—, —S—,, —C≡C—, —CF2O—, —OCF2—, —OC—O— or —O—CO— in such a way that O atoms are not linked directly to one another,
L1 to L4 each, independently of one another, denote F, Cl, CF3 or CHF2,
Y denotes H, F, Cl, CF3, CHF2 or CH3,
Z2, Z2B and Z2D each, independently of one another, denote a single bond, —CH2CH2—, —CH═CH—, —CF2O—, —OCF2—, —CH2O—, —OCH2—, —COO—, —OCO—, —C2F4—, —CF═CF— or —CH═CHCH2O—,
p denotes 0, 1 or 2,
q denotes 0 or 1, and
v denotes 1, 2, 3, 4, 5, or 6,
wherein said medium has a negative dielectric anisotropy,
wherein the total concentration of compounds of formula I-1 and I-2 in said medium is 0.5% to 2%,
wherein the medium further comprises one or more compounds of formula III, , in which
R11 and R12 each, independently of one another, denote H, an alkyl or alkoxy radical having 1 to 15 C atoms, where one or more CH2 groups in these radicals may each be replaced, independently of one another, by, , —C≡C—, —CF2O—, —OCF2—, —CH═CH—, by —O—, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another, and in which, in addition, one or more H atoms may each be replaced by halogen,
A1 on each occurrence independently denotes
a) a 1,4-cyclohexenylene or 1,4-cyclohexylene radical, in which one or two non-adjacent CH2 groups may each be replaced by —O— or —S—,
b) a 1,4-phenylene radical, in which one or two CH groups may each be replaced by N, or
c) a radical from the group spiro[3.3]heptane-2,6-diyl, 1,4-bicyclo[2.2.2]octylene, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl, 1,2,3,4-tetrahydronaphthalene-2,6-diyl, phenanthrene-2,7-diyl and fluorene-2,7-diyl,
where the radicals a), b) and c) may be mono- or polysubstituted by halogen atoms,

n is 0, 1 or 2,
Z1 on each occurrence independently denotes —CO—O—, —O—CO—, —CF2O—, —OCF2—, —CH2O—, —OCH2—, —CH2—, —CH2CH2—, —(CH2)4—, —CH═CH—CH2O—, —C2F4—, —CH2CF2—, —CF2CH2—, —CF═CF—, —CH═CF—, —CF═CH—, —CH═CH—, —C≡C— or a single bond, and
L11 and L12 each, independently of one another, denote H, F, Cl, CF3 or CHF2, and
W denotes S, and
wherein the mixtures X-1 and X-2 having the following compositions, Mixture X-1:

    8%

 

   20%

 

 10.5%

 

  2.0%

 

  0.5%

 

 11.0%

 

  7.5%

 

  1.0%

 

 10.5%

 

 15.5%

 

  3.5%

 

 10.0%

 

Σ
100.0%, Mixture X-2

  2.0%

 

  4.0%

 

 37.0%

 

  3.0%

 

 14.5%

 

 11.5%

 

  3.0%

 

 10.0%

 

 14.0%

 

  1.0%

 

Σ
100.0%, are excluded.