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US4519936A Expired / Lapsed US ⏱️ 0.0 years remaining

Nematic liquid crystals and method of production

Assignee: Werk fuer Fernsehelektronik im VEB Kombinat Mikroelektronik VEB
•
Filing: 1982-07-20
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Granted: 1985-05-28
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Expires: 2002-07-20
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Abstract

Abstract The invention relates to nematic liquid crystals in electro-optical components for the modulation of light as well as for the representation of numerals, signs and images and to a method for producing the same. It is the object of the invention to create nematic liquid crystals which are well suited for electro-optical devices, preferably for two-frequency operation. It has been found that pure or mixed 2-n-alkyl-1, 4-bis-[4-acyloxy]-benzenes of the general formula ##STR1## wherein R 3 =n-C m H 2m+1 , with m=3 to 14, are well suited for utilization in electro-optical components. It was found that 2-n-alkyl-1,4-bis-[acyloxy]-benzene which is well suited for electro-optical components, and especially for two-frequency operations, can be produced by the conversion of a correspondingly substituted benzoic acid or cyclohexane carboxylic acid or a reaction-capable derivative thereof with the corresponding 2-n-alkylhydroquinone--also in the form of its phenylate--at a temperature ranging from 0° C. to 250° C., possibly in the presence of an inert solvent.

Inventors

  • 👤 Dietrich Demus
  • 👤 Wolfgang Weissflog
  • 👤 Horst Kresse

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 16:59
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/30; C09K19/3001; C09K19/3066; C09K19/3068; C09K19/10; C09K19/20; C09K19/2007; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/139; G02F1/1392

Claims Analysis

Total Claims: 21
Claim 1
Independent Claim 33 words
A nematic liquid crystal compound of the general formula ##STR6## wherein R 1 =R 2 and each is ##STR7## with n=1 to 16 R 3 =n-C m H 2m+1 with m=3 to 14.
Claim 2
Dependent Claim 33 words
A nematic liquid crystal compound of the general formula ##STR6## wherein R 1 =R 2 and each is ##STR7## with n=1 to 16 R 3 =n-C m H 2m+1 with m=3 to 14.
Claim 3
Dependent Claim 22 words
A nematic liquid crystal compound according to claim 1 characterized by the formula ##STR8## with n=1 to 16 and m=3 to 14.
Claim 4
Dependent Claim 22 words
A nematic liquid crystal compound according to claim 1 characterized by the formula ##STR9## with n=1 to 16 and m=3 to 14.
Claim 5
Dependent Claim 22 words
A nematic liquid crystal compound according to claim 1 characterized by the formula ##STR10## with n=1 to 16 and m=3 to 14.
Claim 6
Dependent Claim 22 words
A nematic liquid crystal compound according to claim 1 characterized by the formula ##STR11## with n=1 to 16 and m=3 to 14.
Claim 7
Dependent Claim 22 words
A nematic liquid crystal compound according to claim 1 characterized by the formula ##STR12## with n=1 to 16 and m=3 to 14.
Claim 8
Dependent Claim 6 words
The compound of claim 3 2-n-octyl-1,4-bis-(4-n-octoxybenzoyloxy)-benzene.
Claim 9
Dependent Claim 6 words
The compound of claim 3 2-n-butyl-1,4-bis(4-n-hexoxy-benzoyloxy)-benzene.
Claim 10
Dependent Claim 6 words
The composition of claim 2 2-n-hexyl-1,4-bis-(4-n-heptylbenzoyloxy)-benzene.
Claim 11
Dependent Claim 21 words
An electro-optical device including means for generating an electric field, said device containing the nematic liquid crystal compound of claim 1.
Claim 12
Dependent Claim 21 words
An electro-optical device including means for generating an electric field, said device containing the nematic liquid crystal compound of claim 2.
Claim 13
Dependent Claim 21 words
An electro-optical device including means for generating an electric field, said device containing the nematic liquid crystal compound of claim 3.
Claim 14
Dependent Claim 21 words
An electro-optical device including means for generating an electric field, said device containing the nematic liquid crystal compound of claim 4.
Claim 15
Dependent Claim 21 words
An electro-optical device including means for generating an electric field, said device containing the nematic liquid crystal compound of claim 5.
Claim 16
Dependent Claim 21 words
An electro-optical device including means for generating an electric field, said device containing the nematic liquid crystal compound of claim 6.
Claim 17
Dependent Claim 6 words
The compound of claim 3, 2-n-hexyl-1,4-bis-(4-n-heptoxybenzoyloxy)-benzene.
Claim 18
Dependent Claim 6 words
The compound of claim 3, 2-n-undecyl-1,4-bis-(4-n-octoxybenzoyloxy)-benzene.
Claim 19
Dependent Claim 6 words
The compound of claim 3, 2-n-dodecyl-1,4-bis-(4-n-nonoxybenzoyloxy)-benzene.
Claim 20
Dependent Claim 6 words
The compound of claim 6, 2-n-propyl-1,4-bis-(4-n-pentylcyclohexancarbonyloxy)-benzene.
Claim 21
Dependent Claim 24 words
A nematic liquid crystal mixture containing a compound according to any one of claims 1 to 6, 7 to 9, or 16 to 19.

References Cited (Backward Citations)

US4099856A Cited
US4293434A Cited
DD146041A1 Cited
JPS5782347A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1988-05-27 1988-11-26 1989-05-28 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1992-05-27 1992-11-26 1993-05-28 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1996-05-27 1996-11-26 1997-05-28 $7700.00 Window Closed / Lapsed

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