# US 9,039,931 B2 · Liquid crystal composition, liquid crystal element, and liquid crystal display device

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- Number: US 9,039,931 B2
- Document ID: US9039931B2
- Status: Granted
- Kind: B2
- Application number: 14/149,056
- Filed: 2014-01-07
- Published: 2014-05-01
- Granted: 2015-05-26
- Earliest claimed: 2011-07-08
- Assignees: Semiconductor Energy Laboratory Co., Ltd.
- Applicants: Semiconductor Energy Laboratory Co., Ltd.
- Inventors: Tomohiro Tamura; Yasuhiro Niikura; Tetsuji Ishitani; Sachiko Kawakami; Yuko Kawata
- Web page: https://patentgrep.com/patent/US9039931B2

## CPC

- C09K 19/588: {Heterocyclic compounds}
- C07D 317/22: etherified
- C09K 19/0275: {Blue phase}
- C09K 19/54: Additives having no specific mesophase {characterised by their chemical composition}
- G02F 1/134309: {characterised by their geometrical arrangement}
- G02F 1/1368: in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)}
- C09K 19/3405: {the heterocyclic ring being a five-membered ring}
- C09K 2323/00: Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

A liquid crystal composition including a dioxolane compound represented by the general formula (G1) as a chiral agent is provided. In the general formula (G1), R1 and R2 individually represent any of hydrogen, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an aryl group having 6 to 12 carbon atoms, and an alkyl group having 1 to 20 carbon atoms and having a phenyl group as a substituent; R1 and R2 may be bonded to each other to form a ring; R3 and R4 individually represent any of hydrogen, an alkyl group having 1 to 6 carbon atoms, and a cycloalkyl group; and R5 to R40 individually represent any of hydrogen, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, and an aryl group having 6 to 12 carbon atoms.

## Claims

### Claim 1

A liquid crystal composition comprising:
a nematic liquid crystal; and
a dioxolane compound represented by a general formula (G1)
wherein in the general formula (G1):
R1 and R2 individually represent any of hydrogen, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an aryl group having 6 to 12 carbon atoms, and an alkyl group having 1 to 20 carbon atoms and having a phenyl group as a substituent or are bonded to each other to form a ring;
R3 and R4 individually represent any of hydrogen, an alkyl group having 1 to 6 carbon atoms, and a cycloalkyl group; and
R5 to R40 individually represent any of hydrogen, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, and an aryl group having 6 to 12 carbon atoms, and
wherein the liquid crystal composition exhibits a blue phase.

### Claim 2 (depends on 1)

The liquid crystal composition according to claim 1, wherein a proportion of the dioxolane compound in the liquid crystal composition is lower than or equal to 7 wt %.

### Claim 3 (depends on 1)

The liquid crystal composition according to claim 1, wherein a proportion of the dioxolane compound in the liquid crystal composition is lower than or equal to 4 wt %.

### Claim 4 (depends on 1)

The liquid crystal composition according to claim 1, wherein a peak of a diffraction wavelength on the longest wavelength side in a reflectance spectrum is less than or equal to 700 nm.

### Claim 5 (depends on 1)

The liquid crystal composition according to claim 1, wherein a peak of a diffraction wavelength on the longest wavelength side in a reflectance spectrum is less than or equal to 420 nm.

### Claim 6 (depends on 1)

The liquid crystal composition according to claim 1, wherein the dioxolane compound is represented by a structural formula (101);

### Claim 7 (depends on 1)

A liquid crystal element comprising a material based on the liquid crystal composition according to claim 1, wherein the material is located between a pair of electrodes and includes an organic resin.

### Claim 8 (depends on 1)

A liquid crystal display device comprising the liquid crystal element according to claim 1.

### Claim 9

A compound represented by a general formula (G2),
wherein in the general formula (G2):
R1 and R2 individually represent any of hydrogen, an alkyl group having 1 to 6 carbon atoms, a methoxy group, and a phenyl group or are bonded to each other to form a cyclohexyl ring; and
R3 and R4 individually represent an alkyl group having 1 to 6 carbon atoms or a cycloalkyl group; and
R5 to R40 individually represent hydrogen.

### Claim 10 (depends on 9)

The compound according to claim 9, wherein the compound is represented by a structural formula (115):