# US 5,700,392 A · Antiferroelectric liquid crystal composition

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- Number: US 5,700,392 A
- Document ID: US5700392A
- Status: Granted
- Kind: A
- Application number: 08/406,326
- Filed: 1995-03-16
- Granted: 1997-12-23
- Earliest claimed: 1994-03-16
- Assignees: Nippon Soken, Inc.
- Inventors: Katsuhide Kikuchi; Hitoshi Hayashi; Akira Takeuchi; Kenji Takigawa
- Web page: https://patentgrep.com/patent/US5700392A

## CPC

- C09K 19/0266: {Antiferroelectrics}
- C07C 69/90: with esterified hydroxyl and carboxyl groups
- C09K 19/14: linked by a carbon chain
- C09K 19/18: the chain containing carbon-to-carbon triple bonds, e.g. tolans
- C09K 19/2021: {Compounds containing at least one asymmetric carbon atom}
- C09K 19/586: {Optically active dopants; chiral dopants}
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

An antiferroelectric liquid crystal composition comprising a liquid crystal composition having the chiralsmectic C.sub.A phase and a compound represented by the formula (I) shown below: ##STR1## wherein X is --CH.sub.3, --CF.sub.3 or --C.sub.2 H.sub.5 ; R.sup.1 and R.sup.2 are straight-chain or branched alkyl radicals having 3 to 14 and 3 to 10 carbon atoms respectively; Y represents a single bond, or --O--, --CO--, --COO-- or --OCO-- radical; Z represents --COO--, --C.tbd.C-- or --CH.sub.2 CH.sub.2 -- radical; and A.sup.1, A.sup.2 and A.sup.3 independently represent a six membered ring including benzene rings, cyclohexane rings, pyridine rings, and pyrimidine rings, at least one hydrogen of which six membered rings may be replaced by a fluorine atom, chlorine atom, bromine atom, cyano group, nitro group, methyl group, ethyl group or methoxy group.

## Claims

### Claim 1

An antiferroelectric liquid crystal composition consisting essentially of:
50 to 99 wt % of a liquid crystal composition having an antiferroelectric phase and containing at least one compound represented by the formula (II) shown below: ##STR22## wherein X' is --CH.sub.3, --CF.sub.3 or --C.sub.2 H.sub.5 ; R.sup.3 and R.sup.4 are straight chain or branched alkyl radicals having 3 to 14 and 3 to 10 carbon atoms respectively; Y' represents a single bond, or --O--, --CO--, --COO-- or --OCO-- radical; and A.sup.4, A.sup.5 and A.sup.6 independently represent a six membered ring selected from the group consisting of benzene rings, cyclohexane rings, pyridine rings and pyrimidine rings, at least one hydrogen of which six membered ring may be replaced by a fluorine atom, chlorine atom, bromine atom, cyano group, nitro group, methyl group, ethyl group or methoxy group; and
1to 50 wt % of a compound represented by the formula (I) shown below: ##STR23## wherein the wt % is based on the total weight of the liquid crystal composition having the antiferroelectric phase and the compound represented by the formula (I); X is --CH.sub.3, --CF.sub.3 or --C.sub.2 H.sub.5 ; R.sup.1 and R.sup.2 are straight chain or branched alkyl radicals having 3 to 14 and 3 to 10 carbon atoms respectively; Y represents a single bond, or --O--, --CO--, --COO-- or --OCO-- radical; Z represents --COO--, --C.tbd.C-- or --CH.sub.2 CH.sub.2 -- radical; and A.sup.1, A.sup.2 and A.sup.3 independently represent a six membered ring selected from the group consisting of benzene rings, cyclohexane rings, pyridine rings and pyrimidine rings, at least one hydrogen of which six membered ring may be replaced by a fluorine atom, chlorine atom, bromine atom, cyano group, nitro group, methyl group, ethyl group or methoxy group.

### Claim 2 (depends on 1)

The antiferroelectric liquid crystal composition according to claim 1, wherein each A.sup.1, A.sup.2 and A.sup.3 is ##STR24## respectively.

### Claim 3 (depends on 1)

The antiferroelectric liquid crystal composition according to claim 1, wherein X is --CH.sub.3.

### Claim 4 (depends on 1)

The antiferroelectric liquid crystal composition according to claim 1, wherein Y is a single bond.

### Claim 5 (depends on 1)

The antiferroelectric liquid crystal composition according to claim 1, wherein each A.sup.1, A.sup.2 and A.sup.3 is ##STR25## respectively; X is --CH.sub.3 ; and Y is a single bond.