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Film, method for evaluating optical homogeneity of film, and film production method

A technology of evaluation method and manufacturing method, applied in optics, optical components, optical components, etc., can solve problems such as uneven thickness, damaged optical homogeneity, and uneven orientation

Active Publication Date: 2020-01-17
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such a production method involving coating and drying, thickness unevenness and orientation unevenness may occur depending on coating conditions and drying conditions.
Even if the film has unevenness at such a level that it cannot be recognized visually, when it is finally assembled as an optical film in an image display device, the optical homogeneity may be impaired due to the unevenness, and it may be seen image distortion etc.

Method used

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  • Film, method for evaluating optical homogeneity of film, and film production method
  • Film, method for evaluating optical homogeneity of film, and film production method
  • Film, method for evaluating optical homogeneity of film, and film production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0155] Hereinafter, the present invention will be described in more detail by way of examples. Unless otherwise specified, "%" and "part" in an example mean mass % and a mass part. First, the evaluation method will be described.

[0156] (weight average molecular weight)

[0157] Gel Permeation Chromatography (GPC) Determination

[0158] (1) Pretreatment method

[0159] The sample was dissolved in γ-butyrolactone (GBL) to obtain a 20% by mass solution, diluted 100-fold with a DMF eluent, and filtered with a 0.45 μm membrane filter, and the obtained solution was used as a measurement solution.

[0160] (2) Measurement conditions

[0161] Column: TSKgel SuperAWM-H×2+SuperAW2500×1 (6.0mmI.D.×150mm×3 pieces)

[0162] Eluent: DMF (added with 10mM lithium bromide)

[0163] Flow: 0.6mL / min.

[0164] Detector: RI detector

[0165] Column temperature: 40°C

[0166] Injection volume: 20μL

[0167] Molecular weight standard: standard polystyrene

[0168] (imidization rate)

...

manufacture example 1

[0230] [Production example 1: Production of polyimide varnish containing polyimide-based polymer (1)]

[0231] Prepare a reactor in which a silicone tube, a stirring device, and a thermometer are installed in a separable flask, and an oil bath. 75.52 g of the above-mentioned 4,4'-(hexafluoroisopropylidene)diphthalic dianhydride (6FDA) and 2,2'-bis(trifluoromethyl)-4,4'- Diaminobiphenyl (TFMB) 54.44g. 519.84 g of DMAc was added, stirring this at 400 rpm, and stirring was continued until the content of the flask became a uniform solution. Next, stirring was continued for further 20 hours, adjusting the temperature in a container to the range of 20-30 degreeC using an oil bath, and it was made to react and generate|occur|produced a polyamic acid. After 30 minutes, the stirring speed was changed to 100 rpm. After stirring for 20 hours, the temperature of the reaction system was returned to room temperature, and 649.8 g of DMAc was added to adjust the polymer concentration to 10...

manufacture example 2

[0232] [Production example 2: Production of polyimide varnish containing polyimide-based polymer (2)]

[0233] A polyimide-based polymer (2) having a weight average molecular weight of 280,000 and an imidization rate of 98.3% was produced in the same manner as in Production Example 1, except that the concentration was changed to 17.8%, and the same as in Production Example 1 was carried out. It was dissolved to obtain a polyimide varnish (2).

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PUM

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Abstract

Provided are: a film which is suitably used as an optical film in an image display device and has excellent optical homogeneity; and a method for producing the same. Also provided is an evaluation method with which it is possible to evaluate the optical homogeneity of a film more precisely than with conventional evaluation methods. This film is a cast film containing a resin having a weight-average molecular weight of 200,000 or more. In a film reciprocal space image obtained by Fourier transformation of a projection image obtained by a projection method using the film, line profiles in a direction h and a direction v which are perpendicular to each other are respectively referred to as line profile h and line profile v. In a background reciprocal space image obtained by Fourier transformation of a background image obtained by the projection method without using the film, line profiles in a direction h' and a direction v' which are perpendicular to each other are respectively referredto as line profile h' and line profile v'. The maximum intensity of a line profile (h-h') obtained by subtracting the line profile h' from the line profile h is referred to as Ymh, a value Xmax obtained by subtracting the median Xcen of all frequencies of a blank-corrected line profile from the frequency at which the maximum intensity Ymh is obtained is referred to as Xmh, the maximum intensity ofa line profile (v-v') obtained by subtracting the line profile v' from the line profile v is referred to as Ymv, and a value Xmax obtained by subtracting the median Xcen of all frequencies of a blank-corrected line profile from the frequency at which the maximum intensity Ymv is obtained is referred to as Xmv. Both Ymh and Ymv are 30 or less and Ymh, Ymv, Xmh and Xmv satisfy a specific formula.

Description

technical field [0001] The present invention relates to a film, a method for evaluating optical homogeneity of the film, and a method for producing the film. Background technique [0002] For optical films used in image display devices such as liquid crystal display devices and organic EL display devices, since the user directly observes the displayed image through the optical film, very high optical homogeneity is required. sex. [0003] As a method for producing such an optical film, a method is used in which a solution containing a volatile solvent and a resin constituting the optical film is applied to a substrate, dried, and then peeled off (for example, Patent Document 1). In such a production method involving coating and drying, thickness unevenness and orientation unevenness may occur depending on coating conditions and drying conditions. Even if the film has unevenness at such a level that it cannot be recognized visually, when it is finally assembled as an optica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08G73/10G01N21/88G01N21/958
CPCB05D3/00G01N21/958G02B1/04B29D11/00788B29D11/00961C08G73/1039C08G73/1067C08G73/14C09D179/08G01N2021/8883G01N21/8851C08J5/18C08J2379/08C08L33/24G01N21/956C08L79/08B29K2079/08B29K2079/085B29K2867/003
Inventor 野殿光纪唐泽真义岸田明子牧寺雅巳池内淳一
Owner SUMITOMO CHEM CO LTD
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