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Light-reflecting film and laminate having the light-reflecting film

A technology of light reflective layer and light reflective film, applied in optics, optical filters, layered products, etc., can solve problems such as increased haze value of light reflective film, poor orientation of cholesteric liquid crystal, unsuitable light reflective film, etc. , to achieve the effect of low haze value

Active Publication Date: 2020-09-29
NIPPON KAYAKU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the thickness of the light reflection layer is too thick, poor orientation of the cholesteric liquid crystals will occur, which will cause the problem that the haze value of the obtained light reflection film will increase.
Therefore, such light reflective films are not suitable for optical parts requiring low haze values
In addition, it is theoretically impossible to obtain a light-reflecting film that exhibits a reflection performance of more than 50% for incident light only by using a helical cholesteric liquid crystal layer in which the rotation direction of the helix is ​​either right-handed or left-handed. , such a light reflective film is not suitable for optical components that require a reflection performance of more than 50% for incident light in addition to a low haze value

Method used

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  • Light-reflecting film and laminate having the light-reflecting film
  • Light-reflecting film and laminate having the light-reflecting film
  • Light-reflecting film and laminate having the light-reflecting film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0123] The prepared adhesive (S1) was applied to the surface of the cholesteric liquid crystal coating film of R1 prepared in (1) to (2) above using a wire bar so that the film thickness after drying was 10 μm. After removing the solvent by heating at 40°C for 1 minute, use a push roller to join the surface of the cholesteric liquid crystal coating film of L2 together, and use a high-pressure mercury lamp (manufactured by Harison Toshiba Lighting: HX4000L) at an output of 120W for 5 to 10 minutes. It was cured by UV irradiation for 10 seconds, and two layers of a light reflection layer ( R1 ) composed of a cholesteric liquid crystal layer of R1 and a light reflection layer ( L2 ) composed of a cholesteric liquid crystal layer of L2 were laminated. Then, the PET film on the side of the light reflection layer (L2) is peeled off, and the adhesive (S1) is coated on the cholesteric liquid crystal coating film surface of L2 on the side where the PET film is peeled off, and dried. Th...

Embodiment 2

[0125] Using the liquid crystal coating liquid (R2), (L2), (R4) to be coated, except that, the light reflection layer (R2) made of the cholesteric liquid crystal layer of R2 was produced by the same steps as in Example 1 ), a light reflection layer (L2) composed of a cholesteric liquid crystal layer of L2, and a light reflection layer (R4) composed of a cholesteric liquid crystal layer of R4 (R2) / light reflection layer (L2) / light reflection layer (R4)).

Embodiment 3

[0127] In addition to using the liquid crystal coating liquids (L2), (R2), and (R4) to be applied, and reversing the laminated structure of the light reflection layer (L2) and the light reflection layer (R2), the The same steps are used to make the light reflective layer (L2) made of the cholesteric liquid crystal layer of L2, the light reflective layer (R2) made of the cholesteric liquid crystal layer of R2, and the light reflective layer (R2) made of the cholesteric liquid crystal layer of R4. Light reflection film (light reflection layer (L2) / light reflection layer (R2) / light reflection layer (R4)) in which three layers of the light reflection layer (R4) are laminated.

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Abstract

An object of the present invention is to provide a light reflective film having a low haze value and a reflectance exceeding 50% over a relatively wide wavelength band, and a laminate having the light reflective film. A light reflective film, the light reflective film comprising at least one light reflective layer RPRL and at least one light reflective layer LPRL, the light reflective layer RPRL is fixed with right-handed helical cholesteric acid having the ability to reflect right-handed circularly polarized light A type liquid crystal phase, the light reflection layer LPRL is fixed with a left-handed helical structure cholesteric liquid crystal phase having a left-handed circularly polarized light reflection ability, and the above-mentioned light-reflecting layer RPRL and the above-mentioned light-reflecting layer LPRL are stacked in total at least three layers, and the laminated The said RPRL and the said light reflection layer LPRL have the center wavelength of the selective reflection which just deviates by the space|interval of 10 nm or more and 160 nm or less between two mutually adjacent light reflection layers.

Description

technical field [0001] The present invention relates to a light reflection film having a cholesteric liquid crystal having a low haze value and a wide reflection band width, and a laminate having the light reflection film. The light reflective film is mainly used in optical parts such as heat shielding films for building materials and vehicles, brightness enhancement films, and color filters, and optical films for glasses (sunglasses, goggles, eye visors for helmets, etc.). Background technique [0002] Cholesteric liquid crystals with the function of separating circularly polarized light have selective reflection characteristics, and only reflect circularly polarized light whose helical rotation direction is consistent with the direction of circularly polarized light and whose wavelength is the helical pitch of the liquid crystal. Utilizing this selective reflection property, cholesteric liquid crystals are used in optical components such as brightness enhancement films or ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/26G02B5/08G02B27/28G02B5/20B32B7/02G02B5/30
CPCG02B5/26G02B5/0841G02B5/205G02B5/305G02B5/3083G02B5/3016G02B5/30G02B5/3041G02B27/288
Inventor 早崎智之浅见一司矢作悦幸田中兴一
Owner NIPPON KAYAKU CO LTD