# US 8,540,896 B2 · Chiral compound and liquid crystal composition containing the same

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- Number: US 8,540,896 B2
- Document ID: US8540896B2
- Status: Granted
- Kind: B2
- Application number: 12/906,952
- Filed: 2010-10-18
- Published: 2011-05-12
- Granted: 2013-09-24
- Earliest claimed: 2009-11-12
- Assignees: Industrial Technology Research Institute
- Applicants: Chih-Lung Chin; Hui-Fang Tseng; Wan-Chi Chen; Chun-Ming Wu; Kung-Lung Cheng
- Inventors: Chih-Lung Chin; Hui-Fang Tseng; Wan-Chi Chen; Chun-Ming Wu; Kung-Lung Cheng
- Web page: https://patentgrep.com/patent/US8540896B2

## CPC

- C09K 19/588: {Heterocyclic compounds}
- C07D 493/04: Ortho-condensed systems
- C09K 2019/3408: {Five-membered ring with oxygen(s) in fused, bridged or spiro ring systems}
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)

## Abstract

A chiral compound of formula (I) or (II) is provided, wherein each of R1 and R2 independently, is hydrogen, hydroxyl, halogen, amino, nitrile, C1-10 alkyl, or C1-10 alkoxyl. A liquid crystal composition comprising 80-99.5 parts by weight of a liquid crystal host; and 0.5-20 parts by weight of the chiral compound as described above is also provided.

## Claims

### Claim 1

A chiral compound, having a general formula of formula (I) or (II):
wherein R1 and R2 are independently hydrogen, hydroxyl, halogen, amino, nitro, nitrile, C1-10 alkyl, C1-10 alkoxyl, aryl, heteroaryl, cycloalkyl, or hetero cycloalkyl.

### Claim 2 (depends on 1)

The chiral compound as claimed in claim 1, which has a general formula of formula (I).

### Claim 3 (depends on 2)

The chiral compound as claimed in claim 2, wherein R1 and R2 are independently hydrogen, C1-10 alkyl, or C1-10 alkoxyl.

### Claim 4 (depends on 1)

The chiral compound as claimed in claim 1, which has a general formula of formula (II).

### Claim 5 (depends on 4)

The chiral compound as claimed in claim 4, wherein R1 and R2 are independently hydrogen, C1-10 alkyl, or C1-10 alkoxyl.

### Claim 6 (depends on 1)

The chiral compound as claimed in claim 1, wherein the chiral compound is in a white solid form.

### Claim 7 (depends on 1)

The chiral compound as claimed in claim 1, wherein the helical twisting power of the chiral compound is larger than 30 μm−1.

### Claim 8 (depends on 1)

The chiral compound as claimed in claim 1, which has the following formula:

### Claim 9 (depends on 1)

The chiral compound as claimed in claim 1, which has the following formula:

### Claim 10 (depends on 1)

A liquid crystal composition, comprising:
80-99.5 parts by weight of a liquid crystal host; and
0.5-20 parts by weight of the chiral compound as claimed in claim 1.

### Claim 11 (depends on 10)

The liquid crystal composition as claimed in claim 10, wherein an absolute value of a temperature dependence (dλ/dT) for a reflection wavelength of the liquid crystal composition is smaller than 1.

### Claim 12 (depends on 10)

The liquid crystal composition as claimed in claim 10, wherein a reflection wavelength of the liquid crystal host is between about 380 and 800 nm.

### Claim 13 (depends on 10)

The liquid crystal composition as claimed in claim 10, wherein the liquid crystal host is a nematic liquid crystal.

### Claim 14 (depends on 13)

The liquid crystal composition as claimed in claim 13, which is used as a liquid crystal formulation for an optical writing cholesteric liquid crystal display.

### Claim 15 (depends on 10)

The liquid crystal composition as claimed in claim 10, wherein the chiral compound has a general formula of formula (I).

### Claim 16 (depends on 15)

The liquid crystal composition as claimed in claim 15, wherein R1 and R2 of the chiral compound are independently hydrogen, C1-10 alkyl, or C1-10 alkoxyl.

### Claim 17 (depends on 10)

The liquid crystal composition as claimed in claim 10, wherein the chiral compound has a general formula of formula (II).

### Claim 18 (depends on 17)

The liquid crystal composition as claimed in claim 17, wherein R1 and R2 of the chiral compound are independently hydrogen, C1-10 alkyl, or C1-10 alkoxyl.

### Claim 19 (depends on 10)

The liquid crystal composition as claimed in claim 10, wherein the chiral compound has the following formula:

### Claim 20 (depends on 10)

The liquid crystal composition as claimed in claim 10, wherein the chiral compound has the following formula:

### Claim 21 (depends on 10)

The liquid crystal composition as claimed in claim 10, wherein liquid crystal composition is used in a twisted nematic display, a super twisted nematic display, or a thin film transistor display.