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Polymerizable liquid crystal composition, cholesteric reflective film and reflective polarizer using the same

A technology of polymerizable liquid crystals and liquid crystal compounds, applied in liquid crystal materials, nonlinear optics, optics, etc., can solve the problems of cholesteric reflective film taking a long time, productivity problems, etc., and achieve excellent productivity, easy wavelength range, difficult The effect of orientation defects

Inactive Publication Date: 2017-03-08
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when expanding the wavelength range of selective reflection, it takes a long time to produce a cholesteric reflective film in the above-mentioned methods, and there is a problem in productivity.

Method used

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  • Polymerizable liquid crystal composition, cholesteric reflective film and reflective polarizer using the same
  • Polymerizable liquid crystal composition, cholesteric reflective film and reflective polarizer using the same
  • Polymerizable liquid crystal composition, cholesteric reflective film and reflective polarizer using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0195] A polyimide solution for an alignment film was coated on a glass substrate with a thickness of 0.7 mm by spin coating, dried at 100° C. for 10 minutes, and then fired at 200° C. for 60 minutes to obtain a coating film. The obtained coating film was subjected to a rubbing treatment, and it was used as the substrate for a cholesteric reflective film of the present invention. The rubbing treatment was performed using a commercially available rubbing device.

[0196] The polymerizable liquid crystal composition (2) of the present invention was applied on the rubbed substrate by the spin coating method, and dried at 80° C. for 2 minutes. The obtained coating film was placed on a hot plate at 60° C., and a high-pressure mercury lamp adjusted to obtain only ultraviolet light (UV light) near 365 nm was used through a bandpass filter, and was heated at 15 mW / cm 2 Irradiate with UV light for 10 seconds. Then take out the band-pass filter, pass through at 70mW / cm 2 The choleste...

Embodiment 2～16

[0199] The cholesteric reflective films of Examples 2 to 16 were obtained in the same manner as in Example 1. The polarized reflection bands of the obtained cholesteric reflective films are all 300 nm or more, as shown in Table 7. Therefore, it is considered that the cholesteric reflective film produced using the polymerizable liquid crystal composition of this invention is an excellent cholesteric reflective film which can reflect all visible light. In addition, any of the steps of coating, drying, and irradiation in the production of a cholesteric reflective film can be performed in a shorter time than conventional ones, and it is considered to be excellent in productivity.

[0200] Table 7

[0201] polymerizable liquid crystal composition Polarized reflection band Example 1 (2) 350nm Example 2 (4) 360nm Example 3 (6) 310nm Example 4 (8) 305nm Example 5 (9) 350nm Example 6 (10) 355nm Example 7 (11) 355nm ...

Embodiment 17

[0209] The polymerizable liquid crystal composition (4) of the present invention was coated on a rubbing-treated PET film by a bar coating method, and dried at 90° C. for 2 minutes. Keep the obtained coating film at 60°C, use a high-pressure mercury lamp adjusted to obtain only UV light near 365nm through a bandpass filter, and use a high-pressure mercury lamp at 15mW / cm 2 Irradiate with UV light for 10 seconds. Then take out the band-pass filter, pass through at 70mW / cm 2 The cholesteric reflective film of Example 17 was obtained by irradiating UV light with an intensity of 20 seconds.

[0210] Measure the selective reflection wavelength of the cholesteric reflective film of gained, result is the same as embodiment 2, as figure 2 As shown, the polarized reflection band is about 360nm.

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Abstract

The present invention provides a polymerizable liquid crystal composition, a cholesteric reflective film and a reflective polarizer. The polymerizable liquid crystal composition is characterized by comprising: (a) one or more liquid crystal compounds represented by the general formula (I); (b) one or more liquid crystal compounds only having one polymerizable functional group; (c) one or more liquid crystal compounds having two or more polymerizable groups; (d) one or more chiral compounds having one or more polymerizable functional groups; and (e) one or more polymerization initiators, wherein the polymerizable functional group in the liquid crystal composition with more than two polymerizable functional groups is acryloyl or (methyl)acryloyl. R1-Z1-B-A-B-Z2-R2 (1).

Description

[0001] This application is a divisional application of a Chinese patent application with an application date of March 30, 2011, an application number of 201110083809.1, and an invention title of "Polymerizable Liquid Crystal Composition, Cholesteric Reflective Film, and Reflective Polarizer". technical field [0002] The present invention relates to a polymerizable liquid crystal composition useful as a liquid crystal device, a display, an optical component, a colorant, a safety sign, a member for emitting a laser, etc., a cholesteric polarizing film obtained from a polymerizing liquid crystal composition, and a reflective polarizing plate . Background technique [0003] The development of polarizers utilizing the selective reflection properties of cholesteric liquid crystals has been in vogue since 1990. In order to use a cholesteric liquid crystal as a polarizing plate, the wavelength range of selective reflection needs to be in the visible light range, and by setting the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/46C09K19/38G02B5/30C08F222/20C08F220/36
CPCC08F222/20C09K19/38C09K19/46C08F222/205G02B5/3016C08F220/36C09K19/24C09K19/32C09K2019/0448C09K2019/123C09K2019/181C09K2019/2042C09K2019/2078C09K2019/2092C09K19/34C09K19/42C09K2219/03G02B1/11G02F2201/343G02F1/133543
Inventor 桑名康弘长谷部浩史西山伊佐
Owner DIC CORP
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