Liquid crystal system and liquid crystal display

Patent metadata

Field	Value
Publication number	US-9567522-B2
Application number	US-201313801403-A
Country	US
Kind code	B2
Filing date	Mar 13, 2013
Priority date	Dec 17, 2004
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

The instant invention relates to mesogenic systems comprising a) a polymeric component, component A, obtained or obtainable from polymerisation of a precursor comprising one or more mesogenic mono-reactive compounds, one or more di-reactive compounds, which optionally are also mesogenic compounds and optionally a photo-initiator and a low molecular weight component, component B, comprising one or more mono-reactive, mesogenic compounds, one or more mesogenic compounds and one or more chiral dopants, exhibiting a Blue Phase, as well as to the use of these systems in deices and to these devices.

First claim

The invention claimed is:

1. A mesogenic system comprising
a) a polymeric component, component A, obtained from polymerization of a precursor comprising
one or more mesogenic mono-reactive compounds of formula IA

wherein
R 11 is H, F, Cl, Br, I, CN, NO 2 , NCS, SF 5 , SO 2 CF 3 or alkyl which is straight chain or branched, is unsubstituted, mono- or poly-substituted by F, Cl, Br, I or CN, and in which one or more non-adjacent CH 2 groups are optionally replaced, in each case independently from one another, by —O—, —S—, —NH—, —NR 01 —, —SiR 01 R 02 —, —CO—, —COO—, —OCO—, —OCO—O—, —S—CO—, —CO—S—, —CY 1 ═CY 2 —or —C≡C—in such a manner that O and/or S atoms are not linked directly to one another,
R 01 and R 02 are, independently of each other, H or alkyl with 1 to 12 C— atoms,

 is a mesogenic moiety,
PG 11 is a polymerizable or reactive group,
Sp 11 is a spacer group or a single bond, and
X 11 is —O—, —S—, —CO—, —CO—O—, —O—CO—, S—CO—, —CO—S—, —O—CO—O—, —CO—NR 01 —, —NR 01 —CO—, —OCH 2 —, —CH 2 O—, —SCH 2 —, —CH 2 S—, —CF 2 O—, —OCF 2 —, —CF 2 S—, —SCF—, —CH 2 CH 2 —, —CF 2 CH 2 —, —CH 2 CF 2 —, —CF 2 CF 2 —, —CH═N—, —N═CH—, —N═N—, —CH═CR 01 —, —CY 01 ═CY 02 —, —C≡C—, —(CH 2 ) 4 —, —CH═CH—CO—O—, —O—CO—CH═CH— or a single bond, and
Y 01 and Y 02 are, independently of each other, F, Cl or CN, and alternatively one of them may be H,
one or more di-reactive compounds, which optionally are also mesogenic compounds and
optionally a photo-initiator and
b) a low molecular weight component, component B, comprising
one or more mesogenic compounds and
one or more chiral dopants, exhibiting a Blue Phase.

2. The system according to claim 1 , wherein the precursor of component A comprises
one or more mesogenic di-reactive compounds.

3. The system according to claim 1 , wherein the precursor of component A comprises
one or more non-mesogenic (isotropic) mono-reactive compounds.

4. The system according to claim 1 , wherein the precursor of component A comprises
one or more compounds, which lead to an increase of the characteristic temperatures during and/or upon its polymerization and
one or more compounds which on their own lead or would lead to a decrease of the characteristic temperatures during and/or upon its polymerization.

5. The system according to claim 1 , having a Blue Phase extending at least over a temperature range from −10° C. or below to +50° C. or above.

6. A light modulation element, comprising a system according to claim 1 .

7. In a light modulation medium comprising a mesogenic system, the improvement wherein the system is one according to claim 1 .

8. An electro-optical display, comprising a system according to claim 1 .

9. They system according to claim 2 , wherein the mesogenic di-reactive compound is

wherein

has the meaning given for

under formula I above,
PG 12 and PG 13 independently of each other, have one of the meanings given for PG 11 in formula I,
SP 12 and SP 13 independently of each other, have one of the meanings given for SP 11 in formula I, and
X 12 and X 13 independently of each other, have one of the meanings given for X 11 in formula I.

Assignees

• Merck Patent Gmbh

Inventors

• Schott Cecile
• Patrick John
• Adlem Kevin
• Farrand Louise
• Bernatz Georg
• Goetz Achim
• Best Peter
• Plach Herbert

Classifications

• C09K19/586

  Optically active dopants; chiral dopants · CPC title

• C09K19/588

  Heterocyclic compounds · CPC title

• C09K19/38 Primary

  Polymers · CPC title

• Y10T428/10

  Cross-Sectional Technologies · mapped topic

• Y10T428/1036

  Cross-Sectional Technologies · mapped topic