Method of manufacturing phase difference film and phase difference film roll

A technology of retardation film and manufacturing method, which is applied to flat products, instruments, polarizing elements, etc., can solve problems such as cracks, defects, and diaphragm ruptures, so as to reduce adverse effects, improve area use efficiency, and realize field of view angle. Effects of Features

Active Publication Date: 2013-04-17
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This tendency can cause cracks, chi...

Method used

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  • Method of manufacturing phase difference film and phase difference film roll
  • Method of manufacturing phase difference film and phase difference film roll
  • Method of manufacturing phase difference film and phase difference film roll

Examples

Experimental program
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Embodiment

[0154] Hereinafter, the present invention will be described in more detail by way of examples. The present invention is not limited to the following examples.

[0155] First, methods for evaluating properties of polymers and films produced in Examples and Comparative Examples will be described.

[0156] [Glass transition temperature (Tg)]

[0157] The glass transition temperature (Tg) of a polymer, a resin, and a film is calculated|required based on the regulation of JISK7121. Specifically, using a differential scanning calorimeter (manufactured by Rigaku, Thermo plus EVO DSC-8230), under a nitrogen atmosphere, about 10 mg of a sample was heated from normal temperature to 200° C. (heating rate: 20° C. / min) to obtain DSC curve, from which the DSC curve was evaluated according to the starting point method. The reference uses alpha-alumina.

[0158] [Weight average molecular weight]

[0159] The weight-average molecular weight of the polymer was determined using gel permeati...

manufacture example 1-1

[0176] 15 parts by weight of 2-(hydroxymethyl)methyl acrylate (MHMA), 27 parts by weight of methyl methacrylate (MMA), methacrylate 5 parts by weight of ester (AM), 3 parts by weight of N-vinylcarbazole (NVCz), and 50 parts by weight of toluene as a polymerization solvent. The temperature was raised to 105° C. while introducing nitrogen gas into the reaction container, and after reflux was started, 0.02 parts by weight of tert-amyl peroxyisononanoate (manufactured by Arkema Yoshitomi, trade name: Luperox 570) was added as a polymerization initiator. Next, solution polymerization was performed at about 105° C. to 110° C. under reflux while adding dropwise 0.04 parts by weight of the above-mentioned isononanoic acid tert-amyl peroxide over 3 hours. After the dropwise addition was completed, the reaction vessel was further continued to be heated for 4 hours.

[0177] To the polymerization solution thus obtained, 0.1 part by weight of stearyl phosphate (manufactured by Sakai Chem...

manufacture example 1-2

[0181] 15 parts by weight of MHMA, 30 parts by weight of MMA, 5 parts by weight of n-butyl methacrylate (BMA), and 50 parts by weight of toluene as a polymerization solvent were put into a reaction vessel equipped with a stirring device, a temperature sensor, a cooling pipe, and a nitrogen gas introduction pipe. The temperature was raised to 105° C. while introducing nitrogen gas into the reaction container, and after reflux was started, 0.03 parts by weight of tert-amyl peroxyisononanoate (manufactured by Arkema Yoshitomi, trade name: Luperox 570) was added as a polymerization initiator. Next, solution polymerization was performed at about 105° C. to 111° C. under reflux while adding dropwise a mixed solution of 0.06 parts by weight of tert-amyl peroxyisononanoate and 0.7 parts by weight of toluene over 6 hours. After completion of the dropwise addition, further aging was carried out for 2 hours.

[0182] 0.05 parts by weight of an octyl phosphate / dioctyl phosphate mixture (m...

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Abstract

One of the methods of manufacturing a phase difference film of the present invention provides a strip-shaped phase difference film which has a delayed phase axis that is inclined with respect to the longitudinal direction, an NZ coefficient closer to 1 than conventional values, and a weak biaxial stretchability (has strong uniaxial stretchability). In the manufacturing method is used a pair of clip sets that grip both peripheral edge parts of the strip-shaped raw film, and a heating and stretching apparatus having a stretching zone. At the time the clip sets grip the raw film, the traveling speed of the pair of clip sets is the same. The stretching zone has a first segment in which the traveling speed of one of the clip sets that have traveled into the zone is successively reduced, and after the first segment, a second segment in which the traveling speed of the above one of the clip sets that have traveled via the first segment is successively restored.

Description

technical field [0001] The present invention relates to a method for producing a retardation film, and in particular, to a method for producing a retardation film suitable for use in image display devices such as liquid crystal display devices (LCD) and organic electroluminescent (EL) display devices. Moreover, this invention relates to the retardation film roll which wound the retardation film of belt shape. Background technique [0002] In recent years, liquid crystal display devices (LCDs) have become larger in size, and the environment in which they are used is expanding. Based on these circumstances, there is a strong demand for improvement in the visibility of LCDs. However, the demand for improved visibility cannot be fully satisfied by merely improving the liquid crystal cell itself. For the improvement of the visibility of an image display device, the performance improvement of the optical film with which this device is equipped, such as a retardation film, contri...

Claims

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Application Information

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IPC IPC(8): B29C55/04C08F8/16C08F220/14C08J5/18G02F1/1335G02F1/13363B29K33/00B29L7/00B29L11/00G02B5/30
CPCB29C55/045B29K2995/0034C08F8/16G02B5/3083
Inventor 平间进盐谷佳之
Owner NIPPON SHOKUBAI CO LTD
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