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US4358393A Expired / Lapsed US ⏱️ 0.0 years remaining

Nematic liquid crystals of 5-cyano-2-[4-acyloxyphenyl]-pyrimidines and mixtures containing the same

Assignee: Samsung SDI Co Ltd
•
Filing: 1980-04-30
•
Granted: 1982-11-09
•
Expires: 2000-04-30
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Abstract

Abstract Nematic liquid crystals are employed in electro-optical devices for the modulation of the transmittant or incident light and for the black and white or colored rendition of numerals, symbols and pictures. The object of the invention is the use of nematic liquid crystals having a high positive dielectric anisotropy, a low threshold and operating voltage and high clear points and a process for making these compounds. It was found that as liquid crystals for electro-optical devices mixtures are useful which, as an essential component, contain one or several compounds from the class of 5-cyano-2-[4-acyloxyphenyl]-pyrimidines of the formula ##STR1## wherein R 1 is ##STR2## C 5 H 11 -- or C n H 2n+1 O-- R 2 is C n H 2n+1 ; C n H 2n+1 O; C n H 2n+1 S; F; Cl; Br; CF 3 ; C n H 2n+1 COO; C n H 2n+1 OCOO; CN; NO 2 ; C n H 2n+1 NH; or C n H 2n+1 (CH 3 )N, n is 1 to 10, and R 3 is C n H 2n+1 , n is 1 to 10.

Inventors

  • 👤 Horst Zaschke
  • 👤 Dietrich Demus
  • 👤 Sylvia Deresch

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 15:11
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/28; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/34; C09K19/3441; C09K19/345; C09K19/3458; C09K19/3469

Claims Analysis

Total Claims: 13
Claim 1
Independent Claim 15 words
A 5-cyano-2-[4-acyloxyphenyl]-pyrimidine of the formula ##STR12## wherein R 1 is ##STR13## and n=1 to 10.
Claim 2
Dependent Claim 15 words
A 5-cyano-2-[4-acyloxyphenyl]-pyrimidine of the formula ##STR12## wherein R 1 is ##STR13## and n=1 to 10.
Claim 3
Dependent Claim 10 words
The compound of claim 1 wherein R 1 is ##STR14##
Claim 4
Dependent Claim 10 words
The compound of claim 1 wherein R 1 is ##STR15##
Claim 5
Dependent Claim 10 words
The compound of claim 1 wherein R 1 is ##STR16##
Claim 6
Dependent Claim 10 words
The compound of claim 1 wherein R 1 is ##STR17##
Claim 7
Dependent Claim 19 words
A nematic, liquid crystal composition comprising at least one nematic, liquid crystal compound and a compound of claim 1.
Claim 8
Dependent Claim 20 words
The composition of claim 6 comprising said at least one nematic liquid crystal compound of different structure from said compound.
Claim 9
Dependent Claim 32 words
The composition of claim 7 wherein said at least one compound of different structure is selected from the group consisting of 4-n-propylcyclohexanecarboxylic acid-4-cyanophenylester, 4-n-butylcyclohexanecarboxylic acid 4-cyanophenylester, 4-n-pentylcyclohexanecarboxylic acid 4-cyanophenylester, and mixtures thereof.
Claim 10
Dependent Claim 3 words
5-cyano-2-(4-hexyloxycarbonyloxy phenyl) pyrimidine.
Claim 11
Dependent Claim 3 words
5-cyano-2-(4-hexyloxycarbonyloxy phenyl) pyrimidine.
Claim 12
Dependent Claim 20 words
A nematic liquid crystal mixture composed of ______________________________________ 4-n-propylcyclohexanecarboxylic acid-4-cyanophenylester 30% 4-n-butylcyclohexanecarboxylic acid-4-cyanophenylester 30% 4-n-pentylcyclohexanecarboxylic acid-4-cyanophenylester 30% 5-cyano-2-[4-hexyloxycarbonyloxy-phenyl]-pyrimidine 10%. ______________________________________
Claim 13
Dependent Claim 20 words
A nematic liquid crystal mixture composed of ______________________________________ 4-n-propylcyclohexanecarboxylic acid-4-cyanophenylester 30% 4-n-butylcyclohexanecarboxylic acid-4-cyanophenylester 30% 4-n-pentylcyclohexanecarboxylic acid-4-cyanophenylester 30% 5-cyano-2-[4-hexyloxycarbonyloxy-phenyl]-pyrimidine 10%. ______________________________________

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1985-11-08 1986-05-10 1986-11-09 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1989-11-08 1990-05-10 1990-11-09 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1993-11-08 1994-05-10 1994-11-09 $7700.00 Window Closed / Lapsed

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