Compounds for use in liquid-crystal mixtures

US5849216A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Gerd Illian · Tokyo, JP
• Anke Kaltbeitzel
• Rainer Wingen · Hattersheim, DE
• Hubert Schlosser · Hofheim, DE

Key dates

• Filing date: May 31, 1995
• Grant date: Dec 15, 1998
• Expiry date: May 31, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2019/3422
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Compounds of the formula (I) EQU R.sup.1 --(A.sup.1).sub.a (--M.sup.1).sub.b --(--A.sup.2).sub.c (--M.sup.2).sub.d (--A.sup.3).sub.e (--M.sup.3).sub.f (--A.sup.4).sub.g --H(I) in which the symbols and indices have the following meanings: PA1 R.sup.1 is B or a straight-chain or branched alkyl radical having 1 to 22 carbon atoms (with or without an asymmetrical carbon atom) in which, in addition, it is possible for one or two non-adjacent --CH.sub.2 -- groups to be replaced by --O--, --S--, --CO--, --CO--O--, --O--CO--, --CO--S--, --S--CO--, --O--CO--O--, --CH.dbd.CH--, --C.tbd.C--, .DELTA. or --Si(CH.sub.3).sub.2 --, and in which, in addition, one or more hydrogen atoms of the alkyl radical may be substituted by F, Cl, Br or CN, or is a chiral group, for example an epoxide, a dioxolane or a cyclic lactone, PA1 --(A.sup.1).sub.a (--M.sup.1).sub.b --(--A.sup.2).sub.c (--M.sup.2).sub.d (--A.sup.3).sub.e (--M.sup.3).sub.f (--A.sup.4).sub.g -- is a system comprising 1 to 4 rings (cyclohexane, aromatic or heterocyclic), it being possible for the system to be linked in different ways. The compounds according to the invention increase the response speed of liquid-crystal mixtures.