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Process for producing a liquid crystal film and laminate film for optical device

A technology of liquid crystal film and manufacturing method, which is applied in optics, polarizing elements, nonlinear optics, etc., can solve problems such as insufficient adhesion force and easy peeling of the interface, and achieve high-value effects

Inactive Publication Date: 2009-04-15
NIPPON OIL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the case of the above-mentioned form in which two protective layers composed of cured acrylic resin layers are used, in the thermal shock test in which the high temperature test and the low temperature test are alternately repeated, the cured acrylic resin layer may cause striae or orientation. Insufficient adhesion between the immobilized liquid crystal material layer / cured acrylic resin layer causes problems such as easy peeling at the interface

Method used

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Examples

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preparation example Construction

[0038]Regarding the solvent used in the preparation of the above solution, if it is a solvent that can dissolve the liquid crystal substance or composition used in the present invention and can be distilled off under appropriate conditions, it is not particularly limited. Generally, acetone, methyl ethyl Ketones such as ketone and isophorone, ether alcohols such as butoxyethanol, hexoxyethanol, and methoxy-2-propanol, ethylene glycol dimethyl ether, diglyme, etc. Alcohol ethers, esters such as ethyl acetate, methoxypropyl acetate, and ethyl lactate, phenols such as phenol and chlorophenol, N,N-dimethylformamide, N,N-dimethylacetamide, Amides such as N-methylpyrrolidone, halogenated hydrocarbons such as chloroform, tetrachloroethane, dichlorobenzene, etc., or their mixed systems. In addition, in order to form a uniform coating film on the alignment substrate, a surfactant, an antifoaming agent, a leveling agent, etc. may be added to the solution. In addition, for the purpose o...

preparation example

[0106] Using 50mmol terephthalic acid, 50mmol 2,6-naphthalene dicarboxylic acid, 40mmol methylhydroquinone diacetate, 60mmol catechol diacetate and 60mg N-methylimidazole, under nitrogen atmosphere, at 270 The polycondensation was carried out at ℃ for 12 hours. Next, the obtained reaction product was dissolved in tetrachloroethane, and purified by reprecipitation with methanol to obtain 14.6 g of a liquid crystalline polyester. The logarithmic viscosity (phenol / tetrachloroethane (6 / 4 mass ratio) mixed solvent: 30°C) of this liquid crystalline polyester (polymer 1) is 0.16 dl / g, and the liquid crystal phase maintains a nematic phase, and isotropic The isotropic phase-liquid crystal phase transition temperature is 250°C or higher, and the glass transition temperature measured by a differential scanning calorimeter (DSC) is 112°C.

[0107] 20 g of polymer 1 was dissolved in 80 g of N-methyl-2-pyrrolidone to prepare a solution. This solution was applied on a polyimide film (trad...

Embodiment 1

[0109] On the liquid crystal material layer 1 obtained in the preparation example (the surface opposite to the polyimide film), an ultraviolet-curable acrylic adhesive 1 (manufactured by Toagosei Co., Ltd.) with a glass transition temperature (Tg) of 47° C. was used as an acrylic adhesive. The resin layer 1 was coated to a thickness of 5 μm, and a polyethylene terephthalate (PET) film (manufactured by Toray Co., Ltd.) was laminated thereon with a thickness of 50 μm. Layer 1 cured. Thereafter, the polyimide film is peeled off from the integrated laminate of PET film / cured acrylic resin layer 1 / liquid crystal substance layer 1 / polyimide film, and the liquid crystal substance layer is transferred on the PET film to obtain Laminated body composed of film / cured acrylic resin layer 1 / liquid crystal substance layer 1.

[0110] Further, an ultraviolet curable acrylic adhesive 2 (manufactured by Toagosei Co., Ltd.) with a Tg of 135° C. was applied as an acrylic resin layer 2 on the li...

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Abstract

The present invention provides a liquid crystalline film manufacturing method which obtains an ultra-thin optical film and can solve the prior problem of thermo-shock test resistance or interlayer peeling during reworking. The liquid crystalline film can be obtained at least through a first process, a second process and a third process, wherein, in the first process, bonding a liquid crystal substance layer with immobilized liquid crystal orientation formed on an orientation substrate and a re-stripping substrate through an adhesive (1), peeling the orientation substrate so as to transfer the liquid crystal substance layer on the re-stripping substrate, and then bonding to a temporary substrate through an adhesive (2), so as to obtain a laminated body composed of the re-stripping substrate / the adhesive layer (1) / the liquid crystal substance layer / the adhesive layer (2) / the temporary substrate; in the second process, peeling the re-stripping substrate from the laminated body; and in the third process, subsequently peeling between the liquid crystal substance layer and the adhesive layer (2) to obtain a liquid-crystal film composed of the adhesive layer (1) and the liquid crystal substance layer.

Description

technical field [0001] The present invention relates to a method for producing a liquid crystal film useful for various optical elements, and a laminated film for an optical element in which the liquid crystal film is laminated with a polarizing plate or a retardation plate. Background technique [0002] In recent years, optical films used in liquid crystal display devices have been required to have high durability in addition to excellent optical performance. In particular, liquid crystal display devices for portable devices such as mobile phones and for in-vehicle use are required to pass strict environmental tests in which various usage conditions are assumed. [0003] A thin film (thin film) composed of an alignment layer of a liquid crystal compound, especially a thin film composed of a liquid crystal material with a nematic structure, a twisted nematic structure, or a nematic mixed structure immobilized, as a wavelength plate for a liquid crystal display element, a col...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335
CPCC08J5/18G02F1/1303G02F1/133711G02F2203/60
Inventor 穗崎宪二山梨辉昭佐藤晴义小玉和史
Owner NIPPON OIL CO LTD
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