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Multilayered cholesteric liquid crystal, process for producing same, and laminate of multilayered cholesteric liquid crystal

A cholesteric and liquid crystal layer technology, which is applied in the field of cholesteric liquid crystal laminates and their manufacture and the combination of cholesteric liquid crystal laminates, can solve the problems of light leakage, poor productivity, low yield and the like

Inactive Publication Date: 2015-08-26
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: in the case where the wavelength dispersion of the 1 / 2λ plate is not broadband, light leakage occurs depending on the wavelength
However, the method of changing the pitch of the cholesteric layer in the thickness direction to make it tilt requires precise control of the polymerization rate of the chiral agent or liquid crystal compound, and has the disadvantage of low yield.
In addition, when laminating two cholesteric liquid crystal layers with different twist directions, precise control of the polymerization rate is required twice, which has a problem of poor productivity.

Method used

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  • Multilayered cholesteric liquid crystal, process for producing same, and laminate of multilayered cholesteric liquid crystal
  • Multilayered cholesteric liquid crystal, process for producing same, and laminate of multilayered cholesteric liquid crystal
  • Multilayered cholesteric liquid crystal, process for producing same, and laminate of multilayered cholesteric liquid crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0394]

[0395] The following compound 1, compounds in compound group B, fluorine-based horizontal alignment agent, chiral agent, polymerization initiator, and methyl ethyl ketone as a solvent were mixed to prepare a coating solution with the following composition. The obtained coating liquid was made into the coating liquid (R1) which is a cholesteric liquid crystalline mixture.

[0396]

[0397] ·Compound 1

[0398]

[0399] Compound group B

[0400] ·Compound 2

[0401]

[0402] · Compound 3:

[0403]

[0404] · Compound 4:

[0405]

[0406] Fluorine horizontal alignment agent 1

[0407]

[0408] Fluorine horizontal alignment agent 2

[0409]

[0410]

[0411]

[0412] The above-mentioned compound 1, the compound in the above-mentioned compound group B, a fluorine-based horizontal alignment agent, a chiral agent, a polymerization initiator, and methyl ethyl ketone as a solvent were mixed to prepare a coating liquid having the following compo...

Embodiment 2

[0446]

[0447] The following compound 1, compounds in compound group B, fluorine-based horizontal alignment agent, chiral agent, polymerization initiator, and methyl ethyl ketone as a solvent were mixed to prepare a coating solution with the following composition. The obtained coating liquid was made into the coating liquid (L1-2) which is a cholesteric liquid crystalline mixture.

[0448]

[0449]

[0450] Left-handed chiral agent (B)

[0451]

[0452]

[0453] Except for using the coating liquid (L1-2) instead of the coating liquid (L1-1), the cholesteric liquid crystal phase was fixed on the film (F1) prepared in Example 1 by the same method as in Example 1 to prepare A cholesteric liquid crystal laminate (G1-2) in which two layers of cholesteric liquid crystal phases were fixed on a PET film was prepared. The produced cholesteric liquid crystal laminate (G1-2) had no remarkable defects and streaks, and had a good surface state. This cholesteric liquid cryst...

Embodiment 3

[0457]

[0458] The following compound 1, compounds in compound group B, fluorine-based horizontal alignment agent, chiral agent, polymerization initiator, and methyl ethyl ketone as a solvent were mixed to prepare a coating solution with the following composition. The obtained coating liquid was made into the coating liquid (L1-3) which is a cholesteric liquid crystalline mixture.

[0459]

[0460]

[0461] Left-handed chiral agent (C)

[0462]

[0463]

[0464] Except for using the coating liquid (L1-3) instead of the coating liquid (L1-1), the cholesteric liquid crystal phase was immobilized on the film (F1) produced in Example 1 by the same method as in Example 1 to prepare A cholesteric liquid crystal laminate (G1-3) in which two layers of cholesteric liquid crystal phases were fixed on a PET film was prepared. The produced cholesteric liquid crystal laminate (G1-3) had no remarkable defects and streaks, and had a good surface state. This cholesteric liquid...

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Abstract

A multilayered cholesteric liquid crystal which comprises at least one light reflection layer (Xa) that is a light reflection layer obtained by fixing a cholesteric liquid-crystal phase and that contains a dextrorotatory chiral agent having an HTP of 30 μm-1 or more and at least one light reflection layer (Xb) that is a light reflection layer obtained by fixing a cholesteric liquid-crystal phase and that contains a levorotatory chiral agent having an HTP of 30 μm-1 or more, all of the light reflection layers (Xa) and all of the light reflection layers (Xb) having a selective-reflection wavelength in the range of 400-750 nm and the selective-reflection wavelength of at least one of the light reflection layers (Xa) being equal to the selective-reflection wavelength of at least one of the light reflection layers (Xb), and in which all the adjoining light reflection layers obtained by fixing a cholesteric liquid-crystal phase have been superposed so as to be in contact with each other. In the multilayered cholesteric liquid crystal, dextrorotatory and levorotatory, inversely twisted, cholesteric liquid-crystal layers have been superposed so as to be in contact with each other without using a pressure-sensitive adhesive therebetween. This multilayered cholesteric liquid crystal has good surface properties and high transparency, selectively reflects light in the visible-light region, and has high reflection performance.

Description

technical field [0001] The present invention relates to a cholesteric liquid crystal laminate, a method for producing the same, and an assembly of the cholesteric liquid crystal laminate. In more detail, it relates to a cholesteric liquid crystal layered body in which cholesteric liquid crystal layers reversely twisted left and right are contacted and laminated without using an adhesive material, have a good surface state, high transparency, and have selective reflection characteristics in the visible light region A method for producing the same; an assembly of cholesteric liquid crystal laminates having two or more of the cholesteric liquid crystal laminates. Background technique [0002] In principle, a reflective film formed by curing cholesteric liquid crystals reflects one kind of circularly polarized light and transmits another kind of light. Visible light can be reflected by shortening the pitch of the cholesteric liquid crystal to some extent. [0003] As a techniq...

Claims

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Application Information

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IPC IPC(8): G02B5/26B32B27/00G02B5/30G02B1/10
CPCG02B5/3016C09D201/00B32B27/00G02B1/10G02B5/26G02B5/3041
Inventor 加藤峻也久保田靖浩中岛正雄冲和宏
Owner FUJIFILM CORP
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