# US 5,346,648 A · Antiferroelectric liquid crystal compound and liquid crystal composition containing the same

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- Number: US 5,346,648 A
- Document ID: US5346648A
- Status: Granted
- Kind: A
- Application number: 08/128,106
- Filed: 1993-09-29
- Granted: 1994-09-13
- Earliest claimed: 1992-09-30
- Assignees: Showa Shell Sekiyu K.K.
- Inventors: Yasuhiro Koide; Hiroyuki Mogamiya; Yoshiichi Suzuki
- Web page: https://patentgrep.com/patent/US5346648A

## CPC

- C09K 19/0266: {Antiferroelectrics}
- C09K 19/2007: {the chain containing -COO- or -OCO- groups}
- C09K 19/2021: {Compounds containing at least one asymmetric carbon atom}
- C09K 19/32: containing condensed ring systems, i.e. fused, bridged or spiro ring systems
- C09K 19/322: {Compounds containing a naphthalene ring or a completely or partially hydrogenated naphthalene ring}
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

An antiferroelectric liquid crystal compound represented by the following general formula (I): ##STR1## wherein R.sup.1 and R.sup.2 are each independently selected from the group consisting of alkyl groups having from 3 to 18 carbon atoms, Rf is a lower alkyl group or a fluorinated lower alkyl group, (A) and (B) are each independently selected from the group consisting of 1,4-phenylene, 4,4'-biphenylene, and 2,6-naphthalene which may be substituted at least with a halogen atom, and * shows an asymmetric carbon atom.

## Claims

### Claim 1

An antiferroelectric liquid crystal compound represented by the following general formula (I): ##STR17## wherein R.sup.1 and R.sup.2 are each independently selected from the group consisting of alkyl groups having from 3 to 18 carbon atoms, Rf is a lower alkyl group or a fluorinated lower alkyl group, (A) and (B) are each independently selected from the group consisting of 1,4-phenylene, 4,4-biphenylene, and 2,6-naphthalene which may be substituted with at least a halogen atom, and * shows an asymmetric carbon atom.

### Claim 2 (depends on 1)

The antiferroelectric liquid crystal compound according to claim 1, wherein the (A) group is independently selected from the group consisting of ##STR18## and the (B) group is independently selected from the group consisting of ##STR19## wherein t represents a halogen atom and Rf is selected from the group consisting of --CF.sub.3, --C.sub.2 F.sub.5, --CHF.sub.2, --CH.sub.2 F, and --CH.sub.3.

### Claim 3 (depends on 1)

The antiferroelectric liquid crystal compound according to claim 1, wherein the (A) group is 4,4'-biphenylene and the (B) group is 1,4-phenylene.

### Claim 4 (depends on 3)

The antiferroelectric liquid crystal compound according to claim 3, wherein Rf is selected from the group consisting of --CH.sub.3, --CF.sub.3, --C.sub.2 F.sub.5, and --CH.sub.2 F.

### Claim 5 (depends on 1)

The antiferroelectric liquid crystal compound according to claim 1, wherein Rf is selected from the group consisting of --CH.sub.3, --CF.sub.3, --C.sub.2 F.sub.5, and --CH.sub.2 F.

### Claim 6 (depends on 5)

The antiferroelectric liquid crystal compound according to claim 5, wherein Rf is --CH.sub.3.

### Claim 7

A liquid crystal composition containing at least one liquid crystal compound represented by the following general formula (I): ##STR20## wherein R.sup.1 and R.sup.2 are each independently selected from the group consisting of C.sub.3 -C.sub.18 alkyl groups, Rf is a lower alkyl group or a fluorinated lower alkyl group, (A) and (B) are each independently selected from the group consisting of 1,4-phenylene, 4,4'-biphenylene, and 2,6-naphthalene which may be substituted with at least a halogen atom, and * shows an asymmetric carbon atom.