Patent Number: 6,168,728

Title: Acetylene derivatives, and liquid crystal composition and liquid crystal display device each comprising the same

Abstract: The present invention provides new liquid crystalline compounds having a high optical anisotropy value and excellent compatibility with the other liquid crystals, and liquid crystal composition comprising the compounds. The liquid crystalline compounds are represented by the general formula (1): ##STR1## wherein H.sub.1, H.sub.2, H.sub.3, H.sub.4, H.sub.5, H.sub.6, H.sub.7, H.sub.8, H.sub.9, H.sub.10, H.sub.11 and H.sub.12, each independently, represent H, F or Cl, at least one of H.sub.1, H.sub.2, H.sub.3, H.sub.4, H.sub.9, H.sub.10, H.sub.11 and H.sub.12 is F or Cl, R.sub.1 represents an alkyl group of C.sub.1-20, in which methylene groups may be replaced by --O--, --S--, --Si--, --CH.dbd.CH-- or --C.tbd.C--, any hydrogen atoms may be replaced by a halogen atom, and Y.sub.1 is replaced by R.sub.1, F, Cl, Br, I or a cyano group.

Inventors: Miyazawa; Kazutoshi (Ichihara, JP), Koga; Kouji (Ichihara, JP), Matsui; Shuichi (Ichihara, JP), Hachiya; Norihisa (Ichihara, JP), Nakagawa; Etsuo (Ichihara, JP)

Assignee: Chisso Corporation

International Classification: C07C 25/24 (20060101); C07C 25/00 (20060101); C09K 19/10 (20060101); C09K 19/18 (20060101); C09K 019/06 (); C09K 019/34 (); C09K 019/30 (); C09K 019/12 (); C07C 013/00 ()

Expiration Date: 01/02/2018