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Protective films, film laminates and polarizers

A protective film, general-type technology, applied in optics, optical components, polarizing components, etc., can solve the problem that the polarizing film cannot function as a polarizing plate

Active Publication Date: 2018-07-17
TOMOEGAWA PAPER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that cracks are generated on the polarizing film or the polarizing film and the protective film are peeled off, so that the function of the polarizing plate cannot be exerted.

Method used

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  • Protective films, film laminates and polarizers
  • Protective films, film laminates and polarizers
  • Protective films, film laminates and polarizers

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0251] "Protective film and film laminate preparation method"

[0252] [Protection film formation process]

[0253] As long as the above-mentioned protective film can be prepared, the method for preparing the protective film of the present invention is not particularly limited, but as an example, a method including a protective film forming step including the following steps (A1) and (A2) can be cited.

[0254] Step (A1): Apply the energy beam curable composition on the film substrate or the release layer of the film substrate.

[0255] Step (A2): After coating, the energy beam curable composition is cured to form a protective film.

[0256] The energy beam curable composition contains urethane (meth)acrylate as an essential component. The above-mentioned urethane (meth)acrylate as a monomer is a raw material of the protective film, and the repeating unit described in the above-mentioned "Protective Film" is formed by polymerizing this monomer.

[0257] In another embodiment, as a raw m...

Embodiment

[0339] Hereinafter, the present invention will be described based on Examples and Comparative Examples, but the present invention is not limited to the content of the Examples. The protective film obtained by peeling the polyester film substrate from the obtained film laminate (the protective film and the functional layer when the functional layer is formed on the film substrate) was used as the measurement object, and the protection was measured by the following measurement method The moisture permeability and tensile strength of the film.

[0340] [Film thickness]

[0341] Using a digital linear meter D-10HS and a digital counter C-7HS (manufactured by Ozaki Manufacturing Co., Ltd.), the film thickness of the protective film (or protective film + functional layer) was measured.

[0342] [Water vapor permeability]

[0343] According to the moisture permeability test method (cup method) of JIS Z0208, the protective film is measured per 1m in an atmosphere with a temperature of 40°C a...

preparation example 1

[0349] Synthesis of compound 1:

[0350] 196.29 g (1 mol) of tricyclodecane dimethanol and 228.29 g (2 mol) of ε-caprolactone were put into the flask, the temperature was raised to 120°C, and 50 ppm of monobutyl tin oxide was added as a catalyst. Then, under a nitrogen stream, the reaction was performed until the remaining ε-caprolactone was 1% or less in the gas chromatography to obtain the diol (1).

[0351] Put 444.58g (2 moles) of isophorone diisocyanate in another flask, add 425.57g (1 mole) of diols at a reaction temperature of 70°C, and the time when the remaining isocyanate groups become 5.7% Add 232.24g (2 moles) of 2-hydroxyethyl acrylate and 0.35g of dibutyltin laurate, and react until the residual isocyanate group becomes 0.1%, and the monomer that forms the repeating unit (block A) is obtained. Urethane acrylate (compound 1) (m of the repeating unit of compound 1 in the general formula (1a) is 1).

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Abstract

The present invention provides a protective film which has a low moisture permeability in a state of thin layer and has an independence property. The protective film is formed by a repeating unit having a structure derived from 2 functionality carbamic acid ester (methyl) acrylate. The repeating unit has multiple saturate cyclic aliphatic groups. A polarization thin film attached with the protective film is not liable to absorb moisture even in the hot and humid environment because the protective film is a thin film and has a low moisture permeability, and thus the contractility of the polarization thin film is restrained.

Description

Technical field [0001] The present invention relates to a protective film, a film laminate, and a polarizing plate. Background technique [0002] In recent years, liquid crystal displays used in TVs and mobile devices have become thinner and thinner, and the components used in these displays, especially polarizing plates, have also been technologically developed with the goal of extreme thinness. The polarizing plate is usually formed as follows: on both sides of a polarizing film composed of a polyvinyl alcohol film that adsorbs iodine and is uniaxially stretched, an optical film such as triacetyl cellulose (hereinafter referred to as TAC) is bonded with an adhesive. Protective film. In order to bond the TAC film to the polarizing film, a hydrophilic adhesive is used. [0003] This current polarizing plate has the following problems due to the high moisture permeability of the TAC film as a protective film or the large expansion and contraction caused by moisture absorption and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B1/14G02B5/30
Inventor 村田力铃木雅康桑原将臣后藤诚村田亮
Owner TOMOEGAWA PAPER CO LTD
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