# US 2013/0153822 A1 · Blue phase liquid crystal composition, blue phase liquid crystal material and method for manufacturing thereof

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- Number: US 2013/0153822 A1
- Document ID: US20130153822A1
- Status: Published application
- Kind: A1
- Application number: 13/666,946
- Filed: 2012-11-01
- Published: 2013-06-20
- Earliest claimed: 2011-12-15
- Assignees: East China University of Science and Technology; Infovision Optoelectronics (Kunshan) Co., Ltd.
- Inventors: Zhi-gang Zheng; Hai-feng Wang; Dong Shen
- Web page: https://patentgrep.com/patent/US20130153822A1

## CPC

- C09K 19/0275: {Blue phase}
- C09K 19/586: {Optically active dopants; chiral dopants}
- C09K 2019/0448: {the end chain group being a polymerizable end group, e.g. -Sp-P or acrylate}
- C09K 2019/2078: {Ph-COO-Ph-COO-Ph}
- C09K 2323/00: Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K 2323/03: Viewing layer characterised by chemical composition
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

A blue phase liquid crystal material includes a liquid crystal host, a chiral reagent and a stable polymer. The chiral reagent is R811. The stable polymer is formed by photo-polymerizing a first monomer and a second monomer. The first monomer is 2-ethylhexyl acrylate (2-EHA), and the second monomer is 2-methyl-1,4-bis{4-[3(-acrylate)propoxyl]benzoicacid}phenylester (PTPTP). The blue phase liquid crystal material has a blue phase temperature range widened to an extremely low temperature. A blue phase liquid crystal composition and a method for manufacturing the blue phase liquid crystal material by using the blue phase liquid crystal composition are also provided.

## Claims

### Claim 1

A blue phase liquid crystal material, comprising:
a liquid crystal host;
a chiral reagent, the chiral reagent being
and
a stable polymer, the stable polymer being formed by photo-polymerizing a first monomer and a second monomer, the first monomer being
and the second monomer being

### Claim 2 (depends on 1)

The blue phase liquid crystal material of claim 1, wherein a blue phase temperature range of the blue phase liquid crystal material is greater than 69° C.

### Claim 3 (depends on 2)

The blue phase liquid crystal material of claim 2, wherein a lower limit temperature of the blue phase temperature range of the blue phase liquid crystal material is at least down to −35° C.

### Claim 4

A blue phase liquid crystal composition, comprising:
a liquid crystal host;
a chiral reagent, the chiral reagent being
a first monomer, the first monomer being
a second monomer, the second monomer being
and
a photoinitiator.

### Claim 5 (depends on 4)

The blue phase liquid crystal composition of claim 4, wherein a weight ratio of the first monomer to the second monomer is in a range from 1:1.75 to 1:2.25.

### Claim 6 (depends on 5)

The blue phase liquid crystal composition of claim 5, wherein the weight ratio of the first monomer to the second monomer is 1:2.

### Claim 7 (depends on 4)

The blue phase liquid crystal composition of claim 4, wherein a weight percent of the first monomer and the second monomer in the blue phase liquid crystal composition is in a range from 5% to12%.

### Claim 8 (depends on 4)

The blue phase liquid crystal composition of claim 4, wherein the photoinitiator is an ultraviolet photoinitiator, and a weight percent of the photoinitiator in the blue phase liquid crystal composition is in a range from 0.4% to 0.7%.

### Claim 9 (depends on 4)

The blue phase liquid crystal composition of claim 4, wherein a weight ratio of the liquid crystal host to the chiral reagent is in a range from 2.6:1 to 3.5:1.

### Claim 10

A method for manufacturing blue phase liquid crystal material, comprising:
mixing a liquid crystal host, a chiral reagent, a first monomer, a second monomer and a photoinitiator uniformly to prepare a mixture, wherein the chiral reagent is
the first monomer is
and the second monomer is
heating the mixture to form an isotropic mixture;
cooling the isotropic mixture at a constant cooling rate so that the cooled isotropic mixture has a blue phase temperature range; and
irradiating the cooled isotropic mixture at a constant temperature by an ultraviolet light in the blue phase temperature range.

### Claim 11 (depends on 10)

The method for manufacturing the blue phase liquid crystal material of claim 10, wherein a weight ratio of the first monomer to the second monomer is in a range from 1:1.75 to 1:2.25.

### Claim 12 (depends on 10)

The method for manufacturing the blue phase liquid crystal material of claim 10, wherein a weight ratio of the first monomer to the second monomer is 1:2.

### Claim 13 (depends on 10)

The method for manufacturing the blue phase liquid crystal material of claim 10, wherein a weight percent of the first monomer and the second monomer in the blue phase liquid crystal composition is in a range from 5% to 12%.

### Claim 14 (depends on 10)

The method for manufacturing the blue phase liquid crystal material of claim 10, wherein the photoinitiator is an ultraviolet photoinitiator, and a weight percent of the photoinitiator to the blue phase liquid crystal composition is in a range from 0.4% to 0.7%.

### Claim 15 (depends on 10)

The method for manufacturing the blue phase liquid crystal material of claim 10, wherein a weight ratio of the liquid crystal host to the chiral reagent is in a range from 2.6:1 to 3.5:1.

### Claim 16 (depends on 10)

The method for manufacturing the blue phase liquid crystal material of claim 10, wherein an irradiating temperature during irradiating at a constant temperature by ultraviolet light is higher than the lower limit temperature of the blue phase temperature range by about 1° C. to 2° C.

### Claim 17 (depends on 10)

The method for manufacturing the blue phase liquid crystal material of claim 10, wherein the constant cooling rate is 0.5° C./min.

### Claim 18 (depends on 10)

The method for manufacturing the blue phase liquid crystal material of claim 10, wherein an irradiating time during irradiating at a constant temperature by an ultraviolet light is in a range from 3 minutes to 12 minutes, and an irradiating energy is in a range from 8 mW/cm2 to 10 mW/cm2.