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Biphenyl-esters-and-liquid-crystalline-mixtures-comprising-them

Stereographic liquid crystal display employing switchable liquid crystal materials of two polarities in separate channels

To address the above-discussed deficiencies of the prior art, it is a primary object of the present ...

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***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST*** *** NO IMAGES AVAILABLE***

Description:...

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Biphenyl esters and liquid crystalline mixtures comprising them

Details

Inventors: Steinstrasser, Rolf; DEL Pino, Fernando;
Assignee: Merck Patent Gesellschaft mit beschankter Haftung (Darmstadt, DE)
Primary Examiner: Padgett; Benjamin R.
Assistant Examiner: Gron; T. S.
Attorney, Agent or Firm: Millen & White

Biphenyl esters of the formula ##STR1## wherein X is --CO--O-- or --O--CO-- and R.sub.1 and R.sub.2 each are alkyl or alkoxy of 1 - 8 carbon atoms, enlarge significantly the temperature range of the nematic phase of liquid-crystalline compositions without adversely affecting other properties.

DETAILED DESCRIPTION What is claimed is: 1.
A liquid crystalline mixture comprising two or more nematic liquid crystalline compounds, at least one of which is a biphenyl ester of the formula ##STR13## wherein X is --CO--O-- or --O--CO-- and R.
sub.
1 and R.
sub.
2 each are alkyl or alkoxy of 1-8 carbon atoms.
2.
A liquid crystalline mixture of claim 1 wherein X is --CO--O--.
3.
A liquid crystalline mixture of claim 1 wherein X is --O--CO--.
4.
A liquid crystalline mixture of claim 1 wherein at least one of R.
sub.
1 and R.
sub.
2 is alkyl.
5.
A liquid crystalline mixture of claim 4 wherein both R.
sub.
1 and R.
sub.
2 are alkyl.
6.
A liquid crystalline mixture of claim 5 wherein one of R.
sub.
1 and R.
sub.
2 is straight-chain alkyl of 1-7 carbon atoms and the other is alkyl of 3-8 atoms.
7.
A liquid crystalline mixture of claim 1 wherein one of R.
sub.
1 and R.
sub.
2 is alkyl and the other is straight-chain alkoxy.
8.
A liquid crystalline mixture of claim 7 wherein alkyl is straight-chain alkyl of 3-8 carbon atoms.
9.
A liquid crystalline mixture of claim 7 wherein the straight-chain alkoxy is of 1-6 carbon atoms.
10.
A liquid crystalline mixture of claim 1, wherein the biphenyl ester is 4-(4-n-pentylphenyl)benzoic acid 4'-n-pentylphenyl ester.
11.
A liquid crystalline mixture of claim 1, wherein the biphenyl ester is 4-(4-n-pentylphenyl)-benzoic acid 4'-n-butylphenyl ester.
12.
A liquid crystalline mixture of claim 1, wherein the biphenyl ester is 4-(4n-pentylphenyl)-benzoic acid 4'-methoxyphenyl ester.
13.
A liquid crystalline mixture of claim 1, wherein the biphenyl ester is 4-n-hexyloxybenzoic acid 4'-(4-pentylphenyl)-phenyl ester.
14.
A liquid crystalline mixture of claim 1, wherein the biphenyl ester is 4-(4-n-pentylphenyl)benzoic acid 4'-n-propylphenyl ester.
15.
A liquid crystalline mixture of claim 1 comprising 0.
5-40 mole percent of the biphenyl ester.
16.
A liquid crystalline mixture of claim 1 comprising 1-20 mole percent of the biphenyl ester.
17.
A liquid crystalline mixture of claim 1 comprising 1-20 mole percent of 4-(4-n-pentylphenyl)-benzoic acid 4'-n-pentylphenyl ester

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