Optical film, preparation method of the same, and liquid crystal display comprising the same

A technology of optical film and liquid crystal alignment layer, applied in the field of optical film, can solve the problems of liquid crystal film peeling, low polymer mobility, electrostatic discharge, etc., and achieve the effect of improving durability and excellent adhesive strength

Active Publication Date: 2010-12-15
LG CHEM LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when such an alignment layer is used, the liquid crystal film may peel off from the alignment layer or shrink due to insufficient adhesion between the alignment layer and the liquid crystal film in a hot and humid environment
In addition, when the rubbing method is used to prepare the alignment layer, there are some problems: electrostatic discharge may be caused due to contact with impurities during the rubbing process or defect sites may be caused, and fine dust may be generated by rubbing the fabric
However, there is a problem that orientation or surface strength deteriorates due to the low mobility of the polymer despite long-term light irradiation

Method used

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  • Optical film, preparation method of the same, and liquid crystal display comprising the same
  • Optical film, preparation method of the same, and liquid crystal display comprising the same
  • Optical film, preparation method of the same, and liquid crystal display comprising the same

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preparation example Construction

[0076] In addition, the present invention also provides a preparation method of the above-mentioned optical film, the method comprising the following steps: 1) coating the composition for the liquid crystal alignment layer on the substrate based on the acetyl cellulose film, and drying to form a coating , and then irradiating ultraviolet rays to form a liquid crystal alignment layer, the composition comprising: a) a photoreactive polymer selected from a norbornene-based photoreactive polymer containing a cinnamate group, a photoreactive polymer containing a unit represented by Chemical Formula 1 One or more photoreactive polymers in the photoreactive polymer containing the unit represented by Chemical Formula 2, b) a multifunctional monomer crosslinkable with the photoreactive polymer, c) a photosensitive trigger and d) an organic solvent; and 2) coating a liquid crystal compound solution on the liquid crystal alignment layer, drying it, and then irradiating ultraviolet rays th...

Embodiment 1

[0105] As shown in Table 1 below, 5-norbornene-2-methyl-(4-methoxycinnamate) as a photoreactive polymer, dipentaerythritol hexaacrylate as a polyfunctional monomer, and Irgacure 907 (Swiss, Ciba-Geigy) as a photoinitiator was dissolved in toluene at concentrations of 2 wt%, 2 wt% and 0.5 wt%, respectively. The composition solution for the liquid crystal alignment layer prepared according to the above composition is coated on an acetylcellulose substrate with a thickness of 80 microns to a dry thickness of and dried with hot air in an oven at 70° C. for 2 minutes to form a liquid crystal alignment layer.

[0106] The liquid crystal alignment layer was cured once at a rate of 3 m / min by using a wire grid polarizing plate (Moxtek) and a high pressure mercury lamp of 80 w / cm in polarized UV perpendicular to the direction of the substrate to provide alignment.

[0107] Based on 100 parts by weight of the total solution, a mixed solid of 95 wt % of a polymeric liquid crystal compo...

Embodiment 2

[0113] In the same manner as in Example 1, except that tris[2-(acryloyloxy)ethyl]isocyanurate was used instead of dipentaerythritol hexaacrylate as the polyfunctional monomer (as shown in Table 2 below). Preparation of liquid crystal film.

[0114] Table 2

[0115]

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Abstract

The present invention relates to a composition for liquid crystal alignment layer, a preparation method of liquid crystal alignment layer using the same, and an optical film comprising the liquid crystal alignment layer. More particularly, the composition for liquid crystal alignment layer according to the present invention includes crosslinkable functional monomers as well as a photoreactive polymer, thereby improving thermal stability and durability of the liquid crystal alignment layer that is prepared by using the composition for liquid crystal alignment layer. In addition, when the liquid crystal alignment layer is used to produce an optical film, adhesive strength between substrate and liquid crystal alignment layer and between liquid crystal alignment layer and liquid crystal film can be improved.

Description

technical field [0001] The invention relates to an optical film, a preparation method of the optical film and a liquid crystal display comprising the optical film. [0002] This application claims priority to Korean Patent Application No. 10-2008-0005838 filed with the Korean Intellectual Property Office on January 18, 2008, the disclosure of which is incorporated herein by reference in its entirety. Background technique [0003] In general, optical films such as a retardation film and a viewing angle compensation film are disposed between a polarizing plate and a liquid crystal cell, so that a liquid crystal display (LCD) has a reduced color change and an increased viewing angle to improve brightness. The optical film is mainly classified into two kinds of films: one is a stretched film prepared by stretching a polymer film to obtain optical anisotropy, and the other is a film prepared by coating a plastic substrate with a polymerized liquid crystal compound and passing UV ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337
CPCG02F1/133528C08F2/48G02F1/133711C09K2323/027C09K2323/02G02F1/1337C08J5/18
Inventor 申斗铉尹赫朴文洙刘济赫全成浩金宪崔大胜柳东雨
Owner LG CHEM LTD
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