Switch element comprising a liquid-crystalline medium

Patent metadata

Field	Value
Publication number	US-9617473-B2
Application number	US-201113818388-A
Country	US
Kind code	B2
Filing date	Jul 27, 2011
Priority date	Aug 24, 2010
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

The present invention relates to a switch element, which is thermoresponsive and which switches between a less transmissive state for radiant energy and a more transmissive state for radiant energy, and which comprises a liquid-crystalline medium. The invention furthermore relates to the use of the switch element for the regulation of radiant energy flow between interior spaces and the environment and for the regulation of the temperature of interior spaces. The invention furthermore relates to a liquid-crystalline medium, characterised in that it comprises 5-95% of a compound of the formula (I), in particular for use in the switch elements according to the invention.

First claim

The invention claimed is:

1. Switch element, characterised in that it is thermoresponsive and that it switches between a less transmissive state for radiant energy and a more transmissive state for radiant energy, comprising a liquid-crystalline medium, which comprises one or more compounds of the formula (I)

where
R 11 ,R 12 are on each occurrence, identically or differently, F, Cl, CN, NCS, R 1 —O—CO—, R 1 —CO—O—, an alkyl, alkoxy or thioalkoxy group having 1 to 10 C atoms, or an alkenyl, alkenyloxy or thioalkenyloxy group having 2 to 10 C atoms, or a monocyclic, bicyclic or tricyclic cycloalkyl or cycloalkenyl group having 3 to 10 C atoms, where one or more H atoms in the groups mentioned above may be replaced by F, Cl, CN, and where one or more CH 2 groups in the groups mentioned above may be replaced by O, S, —O—CO— or —CO—O—; and where
R 1 is, identically or differently on each occurrence, an alkyl or an alkenyl group having 1 to 10 C atoms, in which one or more H atoms may be replaced by F or Cl; and

is selected from

is selected from

and
X is on each occurrence, identically or differently, F, Cl, CN or an alkyl, alkoxy or thioalkoxy group having 1 to 10 C atoms, where one or more H atoms in the groups mentioned above may be replaced by F or Cl and where one or more CH 2 groups may be replaced by O or S; and
Z 11 is selected from —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CF 2 CF 2 —, —OCH 2 —, —CH 2 O—, —O—, and a single bond.

2. Switch element according to claim 1 , characterised in that the liquid-crystalline medium furthermore comprises one or more compounds of the formula (II), where
in one embodiment of the invention, a compound according to formula (II) is a compound of the following formula (II-1)

where
R 21 ,R 22 are on each occurrence, identically or differently, selected from F, Cl, CN, NCS, R 1 —O—CO—, R 1 —CO—O—, an alkyl, alkoxy or thioalkoxy group having 1 to 10 C atoms and an alkenyl, alkenyloxy or thioalkenyloxy group having 2 to 10 C atoms, where one or more H atoms in the groups mentioned above may be replaced by F or Cl, and where one or more CH 2 groups in the groups mentioned above may be replaced by O, S, —O—CO—or —CO—O—; and
R 1 is defined as in claim 1 ; and

are, identically or differently, selected from

 where
Z 21 is selected from —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CF 2 CF 2 —, —OCH 2 —, —CH 2 O—, —O—, and a single bond;
and where,
in an alternative embodiment of the invention, a compound according to formula (II) is a compound of the following formula (II-2)

where
R 21 ,R 22 are on each occurrence, identically or differently, selected from F, Cl, CN, NCS, R 1 —O—CO—, R 1 —CO—O—, an alkyl, alkoxy or thioalkoxy group having 1 to 10 C atoms and an alkenyl, alkenyloxy or thioalkenyloxy group having 2 to 10 C atoms, where one or more H atoms in the groups mentioned above may be replaced by F or Cl, and where one or more CH 2 groups in the groups mentioned above may be replaced by O, S, —O—CO— or —CO—O—; and
R 1 is defined as in claim 1 ; and

are, identically or differently, selected from

 where
X is defined as in claim 1 ; and
Z 22 is selected from —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CF 2 CF 2 —, —OCH 2 —, —CH 2 O—, —O—, and a single bond;
and where,
in an alternative embodiment of the invention, a compound according to formula (II) is a compound of the following formula (II-3)

where
R 21 ,R 22 are on each occurrence, identically or differently, selected from F, Cl, CN, NCS, R 1 —O—CO—, R 1 —CO—O—, an alkyl, alkoxy or thioalkoxy group having 1 to 10 C atoms and an alkenyl, alkenyloxy or thioalkenyloxy group having 2 to 10 C atoms, where one or more H atoms in the groups mentioned above may be replaced by F or Cl, and where one or more CH 2 groups in the groups mentioned above may be replaced by O, S, —O—CO— or —CO—O—; and
R 1 is defined as in claim 1 ; and

are, identically or differently, selected from

where
Y is on each occurrence, identically or differently, selected from H and X;
X is defined as in claim 1 ; and
Z 23 is selected from —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CF 2 CF 2 —, —OCH 2 —, —CH 2 O—, —O—, —CO—O—, —O—CO—, —CH═CH—, —CH═CX—, —CX═CH— and —CX═CX— and a single bond;
with the proviso that at least one of

is selected from

and where,
in an alternative embodiment of the invention, a compound according to formula (II) is a compound of the following formula (II-4)

where
R 21 ,R 22 are on each occurrence, identically or differently, selected from F, Cl, CN, NCS, R 1 —O—CO—, R 1 —CO—O—, an alkyl, alkoxy or thioalkoxy group having 1 to 10 C atoms and an alkenyl, alkenyloxy or thioalkenyloxy group having 2 to 10 C atoms, where one or more H atoms in the groups mentioned above may be replaced by F or Cl, and where one or more CH 2 groups in the groups mentioned above may be replaced by O, S, —O—CO— or —CO—O—; and
R 1 is defined as in claim 1 ; and

are, identically or differently, selected from

 where
X is defined as in claims 1 ; and
Z 24 is selected from —CO—O—, —O—CO—, —CH═CH—, —CH═CX—, —CX═CH— and —CX═CX—.

3. Switch element according to claim 2 , characterised in that the liquid-crystalline medium furthermore comprises one or more compounds selected from compounds of the formulas (III) and (IV)

where
R 31 ,R 32 ,R 41 and R 42 have the meanings indicated for R 21 and R 22 in claim 2 ; and

are on each occurrence, identically or differently, selected from

Assignees

• Junge Michael
• Merck Patent Gmbh

Inventors

• Junge Michael

Classifications

• C09K19/3402

  having oxygen as hetero atom (sugars C09K19/0422) · CPC title

• C09K19/44 Primary

  containing compounds with benzene rings directly linked · CPC title

• C09K2019/3083

  Cy-Ph-COO-Ph · CPC title

• G02F1/0147

  based on thermo-optic effects (G02F1/132 takes precedence) · CPC title

• C09K2019/3016

  Cy-Ph-Ph · CPC title