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Phase difference film and method for producing the same

A technology of retardation film and thickness direction, which is applied in the direction of chemical instruments and methods, instruments, polarizing elements, etc., can solve the problems such as difficult to manufacture retardation film, and achieve the effect of small NZ coefficient, high visibility and easy manufacture

Active Publication Date: 2021-02-02
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 method for producing the same
  • Phase difference film and method for producing the same
  • Phase difference film and method for producing the 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

The present invention relates to a retardation film and a manufacturing method thereof. The retardation film is formed of a resin containing a crystalline polymer, and the NZ coefficient is less than 1. The manufacturing method includes the following steps: a bonding step, which is formed on the first film A step of laminating a second film on one side or both sides to obtain a third film, the first film is formed of a resin containing a crystalline polymer, the glass transition temperature is Tg (°C), and the melting point is Tm (°C). The shrinkage rate in at least one direction at (Tg+30)°C of the second film is 5 to 50%; in the shrinking process, the above-mentioned third film is heated to Tg°C to (Tg+30)°C, and it is stretched along at least one Directional shrinkage, shrinking the area by 5-50% to obtain the fourth film; and a second heating process, heating the above-mentioned fourth film to (Tg+50)°C to (Tm-40)°C.

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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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30B42D25/328B42D25/364G02B5/18G02B5/32
CPCG02B5/3083B32B27/08B32B38/0036C08J5/18C08G61/08C08G2261/724C08G2261/3324C08G2261/418B42D25/364B42D25/328G02B5/32G02B5/18G02B5/30G02F1/133638C08J2365/00G02F1/133634
Inventor 村上俊秀
Owner ZEON CORP
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