Patent Number: 6,254,941

Title: Fluoroalkylated liquid-crystal compounds, liquid-crystal compositions, and liquid-crystal display elements

Abstract: The present invention provides liquid crystalline compounds having a very high voltage holding ratio, very little variation of these properties depending on temperature, high .DELTA.n, and good compatibility in the other liquid crystal materials particularly under a low temperature, liquid crystal compositions containing these crystalline compounds, and liquid crystal display devices constituted by using the liquid crystal compositions. The liquid crystalline compounds are represented by general formula (1): ##STR1## wherein R represents an alkyl, alkoxy or alkoxyalkyl group of 2-20 carbon atoms, and in each group, any 1-3 hydrogen atoms may be replaced by fluorine atoms; X shows an halogen atom or an alkyl group of 1-20 carbon atoms, any methylene groups (--CH.sub.2 --) not adjacent each other in the alkyl group may be replaced by oxygen atoms, and any one or more hydrogen atoms in the alkyl group may be replaced by fluorine atoms; Z.sub.1, Z.sub.2 and Z.sub.3, each independently, represents --(CH.sub.2).sub.2 --, --(CH.sub.2).sub.4 --, --CH.sub.2 O--, --OCH.sub.2 --, --(CH.sub.2).sub.3 O--, --O(CH.sub.2).sub.3 -- or a covalent bond; Y.sub.1 -Y.sub.16 each independently represent hydrogen atoms or fluorine atoms, but at least two represent fluorine atoms; m represents 0 or 1, and any atom constituting the compound may be replaced by an isotope thereof.

Inventors: Kondou; Tomoyuki (Ichihara, JP), Matsui; Shuichi (Ichihara, JP), Miyazawa; Kazutoshi (Ichihara, JP), Takeuchi; Hiroyuki (Ichihara, JP), Kubo; Yasuhiro (Ichihara, JP), Takeshita; Fusayuki (Kimitsu, JP), Nakagawa; Etsuo (Ichihara, JP)

Assignee: Chisso Corporation

International Classification: C07C 25/18 (20060101); C07C 43/174 (20060101); C07C 43/00 (20060101); C07C 43/225 (20060101); C07C 17/00 (20060101); C07C 25/00 (20060101); C07C 17/26 (20060101); C07C 17/12 (20060101); C07C 17/361 (20060101); C09K 19/20 (20060101); C09K 19/12 (20060101); C09K 19/14 (20060101); C09K 19/10 (20060101); C09K 019/12 (); C09K 019/52 (); C07C 025/13 (); C07C 025/18 ()

Expiration Date: 07/03/2018