Compositions – Liquid crystal compositions – Containing nonsteryl liquid crystalline compound of...
Patent
1993-05-19
1995-08-22
Shah, Mukund J.
Compositions
Liquid crystal compositions
Containing nonsteryl liquid crystalline compound of...
544298, 544316, 544333, G02F 113, C07D21353, C07D23902, C07D40104
Patent
active
054437547
DESCRIPTION:
BRIEF SUMMARY
The unusual combination of anisotropic and fluid behavior of liquid crystals has led to their use in a large number of electrooptical switching and display devices. In these devices, their electrical, magnetic, elastic and/or thermal properties can be utilized for changes in orientation. Optical effect can then be achieved, for example, by means of birefringence, incorporation of dichroitically absorbing dyemolecules ("guest/host mode") or light scattering.
In order to satisfy the ever increasing demands in practice in the wide range of areas of application, there is a constant need for novel improved liquid crystal mixtures and thus also for a large number of mesogenic compounds of different structure. This is not only true of the areas in which nematic LC phases (for example TN="twisted nematic", STN="supertwisted nematic", SBE="supertwisted birefringence effect", ECB="electrically controlled birefringence") are used but also of those having smectic LC phases (for example ferroelectric and electroclinic ones). Many of the compounds suitable for LC mixtures can be described by a structuring principle (see, for example, J. Am. Chem. Soc. 108, 4736 (1986), structure I; Science 231, 350 (1986, FIG. 1 A; J. Am. Chem. Soc. 108,5210 (1986), FIG. 3) in which rings composed of cyclic compounds--aromatics, heteroaromatics, but also saturated ring systems--are linked to alkyl side chains which are straight-chain or substituted in the chain by small groups (for example methyl, chlorine) and thus are branched.
The use of pyrimidine compounds as components of liquid crystal mixtures is disclosed, for example, in
U.S. Pat. Nos. 4,713,197, 4,725,688, 4,752,414, 4,765,924, 4,776,977, 4,804,759, 4,812,258, 4,820,839, 4,892,679, 4,906,401 and 4,906,752.
Similar pyridine compounds also to be used in liquid crystal mixtures are disclosed, for example, in EP-B 242,716, EP-B 240,320, EP-A 391,203, U.S. Pat. Nos. 4,765,924 and 4,952,335.
Liquid crystal mixtures containing pyridylpyrimidines of the formula (A) are described in JP-A 61280489 as compounds exhibiting nematic mesophases or exerting a favorable effect on nematic liquid crystal mixture. ##STR2## (R is C.sub.1-10 -alkyl or -alkyloxy; R.sup.1 is H,Cl,F; R.sup.2 is F,Cl,CN,C.sub.1-10 -alkyl or alkyloxy)
Pyrimidinylpyrimidines of the formula (B) were presented by B. Kampa, K. D. Scherf and H. Zaschke, (7th Liquid Crystal Conference of Socialist Countries, 1987, Parduvice, CSFR; E-8). ##STR3##
Binuclear representatives exhibit none or only a monotropic smectic phase, while trinuclear compounds exhibit S.sub.E and/or S.sub.A phases.
The object of the present invention is to provide novel mesogenic compounds which can be combined with other components to give LC mixtures having advantageous properties. This object is achieved by the compounds defined below:
Liquid-crystalline pyridylpyrimidine compounds of the formula (I) ##STR4## in which A is N and B is CH or A is CH and B is N, 16 carbon atoms or alkenyl having 2 to 16 carbon atoms, it also being possible for one or two non-adjacent --CH.sub.2 -- groups to be replaced by --O--, --S--, --CO--, --CO--O--, --O--CO-- or --O--CO--O-- and it also being possible for one H to be replaced by F, or is one of the following radicals OCF.sub.3, OCHF.sub.2, ##STR5## or R.sup.10 --E--M--, with the proviso that if A is N, R.sup.1 must not be linked with the pyrimidine via a --CO--O-- or --O--CO--O-- group, radicals R.sup.1 linked to the pyridine ring via an --O--CO-- or an --O--CO--O-- group are excluded, having 1 to 16 carbon atoms or alkenyl with 2 to 16 carbon atoms, in which a --CH.sub.2 -- group not adjacent to the linkage point can also be replaced by --O--, --CO--O-- or --O--CO-- or 3 to 8 carbon atoms, 16 carbon atoms or alkenyl having 2 to 16 carbon atoms, in which one or two non-adjacent --CH.sub.2 -- groups can also be replaced by --O--, --CO--O-- or --O--CO--, with the proviso that silicon is only bound to a carbon which has hydrogen and/or carbon as neighboring atoms, or are cyclic alkyl having 3 to 8 carbon atoms, or togeth
REFERENCES:
patent: 4668425 (1987-05-01), Nigorikawa et al.
patent: 4713197 (1987-12-01), Eidenschink et al.
patent: 4725688 (1988-02-01), Taguchi et al.
patent: 4752414 (1988-06-01), Eidenschink et al.
patent: 4765924 (1988-08-01), Inoue et al.
patent: 4776977 (1988-10-01), Taylor et al.
patent: 4804759 (1989-02-01), Shibata et al.
patent: 4812258 (1989-03-01), Krause et al.
patent: 4820839 (1989-04-01), Krause et al.
patent: 4892679 (1990-01-01), Blum et al.
patent: 4906401 (1990-06-01), Dubal et al.
patent: 4906752 (1990-06-01), Muller et al.
patent: 4952335 (1990-08-01), Furukawa et al.
patent: 5286410 (1994-02-01), Weber et al.
B. Kampa, K. D. Scherf and H. Zaschke, Preparation and Investigation of Liquid Crystalline "Bis-Pyrimidines", 7th Liquid Crystal Conference of Socialist Countries, 1987, Parduvice, CSFR, E8.
Escher Claus
Hemmerling Wolfgang
Illian Gerhard
Wingen Rainer
Grumbling Matthew V.
Hoechst Aktiengesellschaft
Shah Mukund J.
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