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БИБЛИОТЕКА ПАТЕНТОВ НА ИЗОБРЕТЕНИЯ

Liquid-crystal medium

Патентный поиск по классам МПК-8:

Класс C09K19/30 содержащие насыщенные или ненасыщенные неароматические кольца, например циклогексановые кольца

Класс C09K19/12 не менее двух бензольных колец, связанных непосредственно, например бифенилы

Класс C09K19/20 связанных цепью, содержащей атомы углерода и кислорода в качестве звеньев цепи, например сложные эфиры

Класс C09K19/32 содержащие конденсированные циклические системы, например конденсированные, мостиковые или спиро-конденсированные циклические системы

Патенты РФ в классе C09K19/32:
лиотропная жидкокристаллическая композиция -  патент 2371465

Класс C09K19/34 содержащие по крайней мере одно гетероциклическое кольцо


Классы МПК:C09K19/30 содержащие насыщенные или ненасыщенные неароматические кольца, например циклогексановые кольца
C09K19/12 не менее двух бензольных колец, связанных непосредственно, например бифенилы
C09K19/20 связанных цепью, содержащей атомы углерода и кислорода в качестве звеньев цепи, например сложные эфиры
C09K19/32 содержащие конденсированные циклические системы, например конденсированные, мостиковые или спиро-конденсированные циклические системы
C09K19/34 содержащие по крайней мере одно гетероциклическое кольцо
Автор(ы): Klasen-memmer, Melanie (Heuchelheim, DE)
Bremer, Matthias (Darmstadt, DE)
Schneider, Konstantin (Bad Camberg, DE)
Pauluth, Detlef (Ober-Ramstadt, DE)
Патентообладатель(и): Merck Patent Gesellschaft mit Beschränkter Haftung (Darmstadt, DE)
Приоритеты:
подача заявки
17.12.2009
публикация патента
19.03.2013

РЕФЕРАТ (Abstract)

The invention relates to a liquid-crystalline medium having negative dielectric anisotropy which comprises at least one compound of the formula I

embedded image
in which

  • R1, R1* and a have the meanings indicated in Claim 1,
  • and to the use thereof for an active-matrix display, in particular based on the VA, PS-VA, PALC, FFS or IPS effect.

Полный текст Патента US 8399073 + PDF


ФОРМУЛА ИЗОБРЕТЕНИЯ (CLAIMS)

The invention claimed is:

1. Liquid-crystalline medium having negative dielectric anisotropy based on a mixture of polar compounds, which comprises: at least one compound of the formula I embedded image in which R1, R1* each, independently of one another, denote an alkyl radical having 1-6 C atoms, and a denotes 1; and at least one compound selected from the group of the compounds of the formulae IIB and IIC: embedded image in which R2B and R2C each, independently of one another, denote H, an alkyl radical having up to 15 C atoms which 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 be replaced by —O—,—S—, embedded image —C≡C—, —CF2O—, —OCF2—, —OC—O— or —O—CO— in such a way that O atoms are not linked directly to one another, L3 and L4 each, independently of one another, denote F or Cl, Z2 and Z2′ each, independently of one another, denote a single bond, —CH2CH2—, —CH═CH—, —CF2O—, —OCF2——CH2O—, —OCH2—, —COO—, —OCO—, —C2F4—, —CF═CF—, or —CH═CHCH2O—, q denotes 0, and v denotes 1 to 6.

2. Liquid-crystalline medium according to claim 1, which additionally comprises one or more compounds of the formula III embedded image in which R31 and R32 each, independently of one another, denote a straight-chain alkyl, alkoxyalkyl or alkoxy radical having up to 12 C atoms, and embedded image denotes embedded image Z3 denotes a single bond, —CH2CH2—, —CH═CH—, —CF2O—, —OCF2—, —CH2O—, —OCH2—, —COO—, —OCO —, —C2F4—, C4H8, —CF═CF—.

3. Liquid-crystalline medium according to claim 1, which comprises at least one compound of the formulae I-1 to I-2: embedded image

4. Liquid-crystalline medium according to claim 1, which additionally comprises one or more compounds of the formulae L-1 to L-11: embedded image in which R and R2 each, independently of one another, have the meanings indicated for R2B in claim 1, and alkyl denotes an alkyl radical having 1-6 C atoms, and s denotes 1 or 2.

5. Liquid-crystalline medium according to claim 1, which additionally comprises one or more terphenyls of the formulae T-1 to T-20: embedded image embedded image in which R′ denotes a straight-chain alkyl or alkoxy radical having 1-7 C atoms, and m denotes 1-6.

6. Liquid-crystalline medium according to claim 1, which additionally comprises one or more compounds of the formulae O-1 to O-18: embedded image embedded image in which R and R2 each, independently of one another, have the meanings indicated for R2B in claim 1.

7. Liquid-crystalline medium according to claim 1, which additionally comprises one or more indane compounds of the formula In embedded image in which R11, R12, R13 denote a straight -chain alkyl, alkoxy, alkoxyalkyl or alkenyl radical having 1-5 C atoms, R12 and R13 additionally denote halogen, embedded image denotes embedded image i denotes 0, 1 or 2.

8. Liquid-crystalline medium according to claim 1, wherein the proportion of compounds of the formula I in the mixture as a whole is ≧3% by weight.

9. Process for the preparation of a liquid-crystalline medium according to claim 1, wherein at least one compound of the formula I is mixed with at least one compound selected from the group of the compounds of the formulae IIB and IIC and, optionally, at least one further liquid-crystalline compound, and additives are optionally added.

10. A method which comprises generating an electro-optical effect in an electro-optical display, wherein said display contains a liquid-crystalline medium according to claim 1.

11. Electro-optical display having active-matrix addressing, wherein said display contains, as dielectric, a liquid-crystalline medium according to claim 1.

12. Electro-optical display according to claim 11, wherein said display is a VA, PS-VA, PALC, FFS or IPS display.

13. Liquid-crystalline medium according to claim 1, which additionally comprises one or more compounds of the formulae IIA: embedded image in which R2A has one of the meanings for R2B in claim 1, L1 and L2 each, independently of one another, denote F or Cl, Z2 denotes a single bond, —CH2CH2—, —CH═CH—, —CF2O—, —OCF2—, —CH2O—, —OCH2—, —COO—, —OCO—, —C2F4—, —CF═CF—, or —CH═CHCH2O—, p denotes 1 or 2, and v denotes 1 to 6.

14. Liquid-crystalline medium according to claim 1, which additionally comprises one or more compounds of the formulae IIB: embedded image wherein the variables are as defined in claim 1 except that q is 1.


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