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Transparent polymer film, and optical compensating film, polarizing plate and liquid crystal display device using the polymer film

An optical compensation film, transparent polymer technology, applied in optics, polarizing elements, nonlinear optics, etc., can solve the problems of small film, difficult to manufacture film, Rth change, etc., to achieve the effect of excellent optical compensation film

Active Publication Date: 2007-10-24
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional cellulose acetate films have the following problems: it is difficult to realize a film with a small retardation regardless of the viewing angle, and Rth varies greatly depending on the measurement environment, especially the humidity environment.
However, in the above-mentioned solution casting film forming method, compressive force is inevitably applied in the film thickness direction during the film forming process, so it is very difficult to produce a film with a small thickness direction retardation.
[0009] In addition, in the case of producing an optical film using the solution film forming method, force may be applied to the web (web) during the film forming process or conveyance process, so it is difficult to produce a film with a small retardation.

Method used

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  • Transparent polymer film, and optical compensating film, polarizing plate and liquid crystal display device using the polymer film

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0155] The above-mentioned polymer solution used in the preparation of the transparent polymer film of the present invention may contain various liquid or solid additives suitable for different purposes in each preparation step. Examples of the above-mentioned additives include plasticizers (preferably added in an amount of 0.01 to 10% by mass relative to the polymer, the same applies hereinafter), ultraviolet absorbers (0.001 to 1% by mass), and fine particles with an average particle diameter of 5 to 3000 nm Powder (0.001-1 mass%), fluorine-based surfactant (0.001-1 mass%), release agent (0.0001-1 mass%), anti-aging agent (0.0001-1 mass%), optical anisotropy control agent ( 0.01 to 10% by mass), an infrared absorber (0.001 to 1% by mass).

[0156] The above-mentioned plasticizer and the above-mentioned optical anisotropy control agent are organic compounds having a molecular weight of 3000 or less, preferably compounds having both a hydrophobic part and a hydrophilic part. ...

Embodiment

[0297] "Assay"

[0298] First, the measurement method and evaluation method of the characteristics used in this Example are shown below.

[0299] [Delay]

[0300] Take 5 points in the width direction every 100 meters in the longitudinal direction (length direction) (central part, end part (5% of the entire width from both ends), and 2 points in the middle part of the central part and the end part point), take out a 2cm□ sample, and calculate the average value of each point according to the following method.

[0301] The retardation value of the film is adjusted by adjusting the humidity of the film for 24 hours under the condition of 25° C. and a relative humidity of 60%, and then using a prism coupler (MODEL 2010 prism Coupler: manufactured by Metrion Corporation) at 25° C. and a relative humidity of Under the condition of 60%, the average refractive index (n) represented by the following formula (a) was obtained using a 632.8 nm He-Ne laser.

[0302] Formula (a): n=(n TE...

Synthetic example 1

[0315] "Synthesis Example 1" Synthesis of Cellulose Acetate Propionate

[0316] 150 g of cellulose (hardwood pulp) and 75 g of acetic acid were placed in a 5 L separation flask with a reflux device as a reaction vessel, and vigorously stirred for 2 hours while heating using an oil bath adjusted to 60°C. The cellulose subjected to such a pretreatment is swollen and pulverized so that it becomes fluffy. The reaction vessel was cooled in an ice-water bath at 2°C for 30 minutes.

[0317] Separately, a mixture of 1545 g of propionic anhydride and 10.5 g of sulfuric acid was prepared as an acylating agent, and after cooling to -30° C., it was added all at once to the reaction container containing the above-mentioned pretreated cellulose. After lapse of 30 minutes, the external temperature was gradually increased, and the internal temperature was increased to 25° C. after 2 hours from the addition of the acylating agent. The reaction vessel was cooled using a 5° C. ice-water bath, ...

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Abstract

A transparent polymer film, which satisfies Re < 5, |Rth| < 20, |Re(700) - Re(400)| < 5, |Rth(700) - Rth(400)| < 20, |Re(10%) - Re(80%)| < 5, and |Rth(10%) - Rth(80%)| < 15, and exhibits a moisture permeability in terms of a film thickness of 80 [mu]m of 500 g / (m<2>day) or more. The above film is excellent in the resistance to moisture, is reduced in optical inisotropy, and can be directly pasted together with a polarizing film.

Description

technical field [0001] The present invention relates to a transparent polymer film which has excellent moisture resistance, small optical anisotropy and can be directly attached to a polarizing film, and also relates to an optical compensation film, a polarizer and a liquid crystal display device using the transparent polymer film. Background technique [0002] In silver halide photosensitive materials, retardation plates, polarizers and image display devices, cellulose esters, polyesters, polycarbonates, cycloolefin polymers, vinyl polymers, and polyimides are used as representatives. polymer film. These polymers are widely used as films for optical applications because they can produce films more excellent in planarity and uniformity. [0003] Among them, since the cellulose ester film has a suitable moisture permeability, it can be directly laminated with the most common polarizing film made of polyvinyl alcohol (PVA) / iodine in an on-line manner. Therefore, cellulose ac...

Claims

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Application Information

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IPC IPC(8): G02B5/30C08J5/18B32B7/02G02F1/1335B32B23/20
Inventor 佐佐田泰行
Owner FUJIFILM CORP