Compositions – Liquid crystal compositions – Containing nonsteryl liquid crystalline compound of...
Patent
1996-07-24
1998-07-14
Wu, Shean C.
Compositions
Liquid crystal compositions
Containing nonsteryl liquid crystalline compound of...
25229901, 570131, C09K 1930, C07C 2208
Patent
active
057799369
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/JP94/01914 filed Nov. 11,1994.
FIELD OF TECHNOLOGY
The present invention relates to a liquid crystalline compound and liquid crystal composition. More specifically, the present invention relates to a novel liquid crystalline compound having a group substituted with fluorine at the end of the molecule and a liquid crystal composition containing the same.
BACKGROUND TECHNOLOGY
Liquid crystal compositions, particularly nematic liquid crystal compositions are widely used for display materials, for example, in displays such as watches, tabletop calculators, word-processors, computer terminals, and televisions. Driving mode of liquid crystal display devices using a nematic liquid crystal composition is roughly classified into three kinds of modes such as twisted nematic (TN), super twisted nematic (STN), and thin film transistor driving.
While a suitable driving mode is selected according to application, it is necessary in any method that response speed to field inversion is high to realize an excellent displaying capability.
In order to actualize a high response speed to field, it is necessary that the viscosity of liquid crystal composition is low. That is, it is important to use a liquid crystal composition having a low viscosity. In order to achieve this object, attempts have been made in which a bicyclohexane type compound or cyclohexylethyl cyclohexane type compound which is known as a low viscosity liquid crystal compound is used as a constituent (hereinafter referred to as viscosity decreasing agent) of liquid crystal compositions to decrease the viscosity (for example, Examined Japanese Patent Publication No. 05-020418, Examined Japanese Patent Publication No. 62-015052, Unexamined Japanese Patent Publication No. 59-70624, and WO 90/01056). However, such bicyclic cyclohexane type compounds have a disadvantage that clearing point (temperature at which a liquid crystal phase or crystal becomes an isotropic liquid) is low. When the decrease in viscosity of the compositions is intended, the amount of viscosity decreasing agent to be used is as much as several tens percent, and as the result, mesomorphic range of liquid crystal compositions is remarkably decreased. Consequently, it is conceivable to start from bicyclohexane type compounds or cyclohexylethyl cyclohexane type compounds having a function of decreasing viscosity and deriving them to liquid crystalline compounds which additionally have a high clearing point. However, efficient methods for the derivation have not yet been known.
Heretofore, compounds in which fluorine atoms are introduced in such a group as a side chain alkyl group at the end of a molecule, for example, compounds in which three or more fluorine atoms are introduced in a side chain alkyl group (DE 4101600), compounds in which a plural number of difluoromethylene groups are introduced (DE 4034123), and compounds in which fluorine atoms are introduced at the central bonding part (DE 4023106 and DE 4015681) are known. However, these compounds are not related to bicyclohexane type compounds nor cyclohexylethyl cyclohexane type compounds. Besides, these compounds do not lead to a rise in the clearing point.
Further, there have been proposed many applications in which compounds having a fluoroalkyl group are recited in their claims (for example, Unexamined Japanese Patent Publication Nos. 1-135745 and 3-153670). However, there is no case in which such compounds are actually prepared and their physical properties of the compounds are studied.
DISCLOSURE OF THE INVENTION
An object of the present invention is to overcome the defects in the prior art mentioned above and to provide bicyclohexane type compounds or cyclohexylethyl cyclohexane compounds which can raise the clearing point of liquid crystal compositions while maintaining viscosity decreasing function when used as a component of liquid crystal compositions, and to provide liquid crystal compositions containing the compounds.
The present invention which is to achieve the objects mentioned ab
REFERENCES:
patent: 5198151 (1993-03-01), Kurataki et al.
patent: 5516454 (1996-05-01), Scheuble et al.
CA 118:91036, 1992
CA 117:101196, 1992.
CA 116:184669, 1991.
CA 115:146735, 1991.
Chemical Abstract 122:132748, 1993.
Fujita Atsuko
Goto Yasuyuki
Kondo Tomoyuki
Matsui Shuichi
Miyazawa Kazutoshi
Chisso Corporation
Wu Shean C.
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