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Phase difference film and production method for same

A technology of retardation film and manufacturing method, applied in chemical instruments and methods, instruments, polarizing elements, etc., can solve problems such as difficulty in manufacturing retardation film, and achieve the effects of small NZ coefficient, easy manufacture and high visibility

Active Publication Date: 2018-06-08
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in such a manufacturing method, it is difficult to manufacture a certain kind of retardation film

Method used

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  • Phase difference film and production method for same
  • Phase difference film and production method for same
  • Phase difference film and production method for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0200] Examples are shown below to describe the present invention in detail. However, the present invention is not limited to the examples shown below, and can be arbitrarily modified and implemented within a range not departing from the claimed scope of the present invention and a scope equivalent thereto.

[0201] In the following description, unless otherwise stated, "%" and "part" which show an amount are based on weight. In addition, the operations described below were performed under conditions of normal temperature and normal pressure unless otherwise specified.

[0202] [Evaluation method]

[0203] [Measurement method of weight average molecular weight and number average molecular weight]

[0204] The weight-average molecular weight and number-average molecular weight of the polymer were measured as polystyrene-equivalent values ​​using a gel permeation chromatography (GPC) system ("HLC-8320" manufactured by To soh Co., Ltd.). In the measurement, an H-type column (m...

manufacture example 1

[0213] [Production Example 1: Production of hydrogenated product of ring-opening polymer of dicyclopentadiene]

[0214] After sufficiently drying the metal pressure-resistant reactor, nitrogen substitution was performed. In this metal pressure-resistant reactor, 154.5 parts of cyclohexane and 42.8 parts of dicyclopentadiene (with an internal type content rate of 99% or more) in a 70% cyclohexane solution (in the form of dicyclopentadiene) were added. The amount of diene is 30 parts) and 1.9 parts of 1-hexene, heated to 53°C.

[0215] A solution was prepared by dissolving 0.014 parts of tungsten tetrachloride phenylimide (tetrahydrofuran) complex in 0.70 parts of toluene. To this solution was added 0.061 parts of a 19% diethylaluminum ethoxide / n-hexane solution, and stirred for 10 minutes to prepare a catalyst solution.

[0216] The catalyst solution is added into a pressure-resistant reactor to initiate ring-opening polymerization. Then, it was made to react for 4 hours, ke...

manufacture example 2-1

[0227] [Manufacture Example 2-1: Manufacture of Raw Film 1]

[0228] The granular molded body obtained in Production Example 1 was obtained using a hot-melt extrusion film forming machine (product name "Measuring Extruder TypeMe-20 / 2800V3", manufactured by Optical Control Systems Co., Ltd.) with a T-die head, according to a thickness of 200 μm. , A method of winding a film with a width of 120 mm around a roll at a speed of 1.5 m / min to obtain a film molded body (hereinafter, may be referred to as raw material film 1).

[0229] The operating conditions of the film forming machine are as follows.

[0230] · Cylinder temperature setting = 280°C ~ 290°C

[0231] · Die head temperature = 270°C

[0232] ·Screw speed=30rpm

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Abstract

Provided is a phase difference film that comprises a resin including a crystalline polymer. Further provided is a production method which includes: a bonding step for obtaining a third film by bondinga second film to one or both surfaces of a first film comprising a resin that includes the crystalline polymer, has a glass transition temperature of Tg ( DEG C), and a melting point of Tm ( DEG C),wherein the second film has a shrinkage factor of 5-50% in at least one direction in (Tg+30) DEG C; a shrinking step for heating the third film to Tg DEG C to (Tg+30) DEG C, shrinking in at least onedirection, and shrinking the area thereof 5-50% to obtain a fourth film; and a secondary heating step for heating the fourth film to from (Tg+50) DEG C to (Tm-40) DEG C. The NZ coefficient is less than 1.

Description

technical field [0001] The present invention relates to a retardation film and a manufacturing method thereof. Background technique [0002] In display devices such as liquid crystal display devices, various retardation films are often provided. [0003] As a method for producing a retardation film, a method of imparting optical anisotropy by stretching an isotropic raw material film is widely used. However, in such a manufacturing method, it is difficult to manufacture a certain type of retardation film. For example, it is difficult to obtain a film having an NZ coefficient of less than 1, such as a three-dimensional retardation film, a negative A-plate, or a positive C-plate, simply by stretching an isotropic film. [0004] As a method of obtaining a retardation film having a small NZ coefficient value, several methods have been proposed. As one of them, there is known a method including bonding a raw material film and a shrinkable film together to obtain a laminated fi...

Claims

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Application Information

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IPC IPC(8): G02B5/30B42D25/328B42D25/364G02B5/18G02B5/32
CPCG02B5/3083B32B27/08B32B38/0012B32B38/0036C08G61/06C08L65/00C08G2261/3321B42D25/364B42D25/328G02B5/32G02B5/18G02B5/30G02F1/133638C08G61/08C08G2261/3324C08G2261/418C08J5/18C08J2365/00G02F1/133634
Inventor 村上俊秀
Owner ZEON CORP
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