LIQUID CRYSTALLINE MEDIUM

• US 20190309225A1
• Filed: 12/06/2017
• Published: 10/10/2019
• Est. Priority Date: 12/09/2016
• Status: Abandoned Application

• Current Assignee: Merck Patent GmbH (Merck & Co., Inc.)
• Original Assignee: Merck Patent GmbH (Merck & Co., Inc.)
• Inventors: WITTEK, Michael, REIFFENRATH, Volker
• Application Number:
  US16/467,086
• Publication Number:
  US 20190309225A1
• Time in Patent Office: Days
• CPC Class Codes: C09K 19/3003 Compounds containing at least two rings in which the different rings are directly linked (covalent bond)
• CPC Class Codes: C09K 19/3066 in which the rings are linked by a chain containing carbon and oxygen atoms, e.g. esters or ethers
• CPC Class Codes: C09K 19/3402 having oxygen as hetero atom sugars C09K19/0422
• CPC Class Codes: C09K 2019/0466 the linking chain being a -CF2O- chain
• CPC Class Codes: C09K 2019/123 Ph-Ph-Ph
• CPC Class Codes: C09K 2019/3004 Cy-Cy
• CPC Class Codes: C09K 2019/3009 Cy-Ph
• CPC Class Codes: C09K 2019/301 Cy-Cy-Ph
• CPC Class Codes: C09K 2019/3025 Cy-Ph-Ph-Ph
• CPC Class Codes: C09K 2019/3422 the heterocyclic ring being a six-membered ring
• CPC Class Codes: G02F 1/1362 Active matrix addressed cells G02F1/134336, G02F1/134363 take precedence

Abstract

The invention relates to dielectrically positive liquid crystalline media comprising a compound of formula I

wherein R¹ denotes alkenyl having 2 to 12 C atoms, and X¹ denotes H, F or alkyl having 1 to 6 C atoms,
and to liquid crystal displays comprising these media, especially to active matrix displays and in particular to TN, FFS and IPS mode displays.

Claims

1. Liquid crystalline medium, characterised in that it comprises one or more compounds of formula I

2. Liquid crystalline medium according to claim 1, wherein the medium comprises one or more compounds of formula I of claim 1, wherein R¹ denotes alkenyl having 2 to 7 C atoms and X¹ denotes methyl.

3. Liquid crystalline medium according to claim 1, wherein the concentration of the one or more compounds of formula I is in the range of from 1% to 15% by weight.

4. Liquid crystalline medium according to claim 1, wherein the medium comprises one or more compounds selected from the group of compounds of the formulae II and III

5. Liquid crystalline medium according to claim 1, wherein the medium comprises one or more compounds of the formula IV

6. Liquid crystalline medium according to claim 1, wherein the medium comprises one or more compounds of the formula VI

7. Process for the preparation of a liquid-crystalline medium according to claim 1, characterised in that at least one compound of the formula I is mixed with at least one further mesogenic compound, and one or more additives and/or one or more stabilisers are optionally added.

9. Liquid crystal display, characterised in that it comprises a liquid crystal medium according to claim 1.

10. Liquid crystal display according to claim 9, characterised in that it is addressed by an active matrix.

8. (canceled)