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Optical film, multilayer optical film including same, and method for producing optical film

A manufacturing method and optical film technology, which is applied in the field of optical films, can solve problems such as delay in the thickness direction, and achieve the effect of easy in-plane delay

Active Publication Date: 2017-05-10
MITSUBISHI GAS CHEM CO INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in Patent Document 3, the retardation Rth in the thickness direction is also not considered.

Method used

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  • Optical film, multilayer optical film including same, and method for producing optical film
  • Optical film, multilayer optical film including same, and method for producing optical film
  • Optical film, multilayer optical film including same, and method for producing optical film

Examples

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Effect test

Embodiment 1

[0132] Using IUPIRON H4000, which is bisphenol A polycarbonate with a viscosity average molecular weight of 14,000 to 17,000, by melt extrusion method, according to figure 1 , A transparent polycarbonate film with a thickness of 100 μm was molded at a molding temperature of 270° C. through a T die, and supplied to a metal elastic roller with a diameter of 300 mm and a metal roller with a diameter of 400 mm at about 260° C. It was cooled between rolls at 135° C. to obtain a film with a thickness of 100 μm. However, at this time, the linear pressure received by the molten polycarbonate resin from the central portion of the two cooling rolls was 15 kgf / cm, and the pulling speed was 14.5 m / min. Moreover, since the heat distortion temperature (Th) of polycarbonate resin was 124 degreeC, the difference with the surface temperature (Tr) of a roll was 11 degreeC.

Embodiment 2

[0183] Mix 28 parts by weight of Mitsubishi Engineering Plastics Co., Ltd. product polyphenylene ether resin (PPE) trade name: PX100L and 72 parts weight PS Japan Co., Ltd. product general-purpose polystyrene (GPPS) product name: HH105 as a positive birefringence material A total of 100 parts by weight was used to produce a film having a thickness of 200 μm at a setting of 290° C. using a film production apparatus equipped with a T-die. The obtained film was heated to 125°C and uniaxially stretched 2.3 times to obtain a film (film 2). The obtained sample and the film (film 1) shown in the reference example mentioned later were laminated|stacked using an adhesive agent. Table 2 shows the evaluation results of the optical properties.

[0184] [reference example]

[0185] In the same manner as in Example 1, a film (film 1) having a thickness of 100 μm was produced.

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Abstract

Provided are: an optical film that has a good appearance, low in-plane retardation Re, and high thickness-direction retardation Rth; and a method for producing such an optical film. Also provided is a multilayer optical film that uses the optical film, that exhibits little change in retardation as a result of wavelength, and that has small retardation at low wavelengths. The optical film is obtained by sandwiching a melted resin between a first cooling roll comprising an elastic metal roll and a second cooling roll comprising a non-elastic metal roll and molding said melted resin. The optical film has a good appearance, the absolute value of the in-plane retardation Re thereof is 10 nm or less, and the thickness-direction retardation Rth thereof is 40 nm or more.

Description

technical field [0001] The present invention relates to an optical film used in optical applications, flat panel display applications, etc., and a method for producing the same. More specifically, it relates to an optical film obtained by, for example, melt extrusion molding, having a small in-plane retardation Re and a large thickness direction retardation Rth, and methods of manufacture thereof. Moreover, this invention relates to the laminated optical film which laminated|stacked the said optical film as a retardation film. Background technique [0002] In recent years, in optical applications and liquid crystal display applications, optical films that are excellent in transparency and have a small in-plane retardation Re are required. In the VA mode liquid crystal cell, the refractive index in the direction perpendicular to the screen (thickness direction) is larger than the refractive index in the in-plane direction. Therefore, in order to improve the viewing angle in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B29C41/24B29C47/14B32B7/02B32B27/00B32B27/30B32B27/36C08J5/18G02F1/13363B29K25/00B29K45/00B29K67/00B29K69/00B29K77/00B29L7/00B29L9/00B29C48/08B29C48/305B29C48/92
CPCB29C41/24B32B27/00B32B27/30B32B27/36B29C48/92B29C48/08B29C48/0011B29C48/0018B29C48/305B29C48/914B29D11/00788B29K2101/12B29K2105/0005B29K2995/0018G02B5/3083B29C48/40G02F1/133634
Inventor 柿木修小室幸次
Owner MITSUBISHI GAS CHEM CO INC
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