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Optical film

A technology of optical film and cast film, applied in optics, optical components, nonlinear optics, etc., can solve problems such as optical performance degradation, achieve excellent optical stability, stabilize display performance, and maintain the effect of display performance

Inactive Publication Date: 2012-11-28
KONICA MINOLTA OPTO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] The object of the present invention is to provide an optical film that can solve the above-mentioned deterioration of optical performance in the width direction that occurs in an optical film that has a width of 1400 mm or more, while reducing the problems that have occurred in the past. The peeling of the film section, the prevention of film breakage, the improvement of film dimensional stability and other quality maintenance, as a result, can provide an optical film with excellent quality

Method used

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  • Optical film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0193] (Manufacture of optical film using melt casting film forming equipment)

[0194] A norbornene resin film which is an optical film of the present invention having a target dry film thickness of 80 μm was produced by a melt casting film forming apparatus.

[0195] Norbornene resin film (Zionoa 1420, manufactured by Japan Zion Co., Ltd.) 100 parts by weight

[0196] Synthetic silicon dioxide 0.2 parts by weight

[0197] Fatty amide solvent 0.2 parts by weight

[0198] The mixture of the above-mentioned materials was melt-mixed at 250° C. with a twin-screw extruder, filtered with Fine Met NF (nominal filtration accuracy: 15 μm) manufactured by Nippon Seisen Co., Ltd., and then pelletized. Using the pellets, filter them a second time with Nippon Seisen Co., Ltd.'s Fainmet NF (nominal filtration accuracy: 20 μm), and melt-extrude them in sheet form from the same T-die as above at a melting temperature of 250°C to 30°C. On the cooling drum, it is cooled and solidified to ob...

Embodiment 2～7

[0209] A norbornene resin film was produced by using the same material as in the above-mentioned Example 1, changing the film thickness and width, and using a melt casting film forming apparatus.

[0210] In addition, when the surface roughness (arithmetic mean roughness: Ra) of the sheared film cross section was measured in the same manner as in the case of the above-mentioned Example 1, any of them was 0.5 to 0.6 μm. In addition, either one of ΔRt and ΔRo is also 4 to 6 nm and 1.5 to 3 nm.

[0211] The production conditions of the norbornene resin films in Examples 2 to 7 and the obtained measurement results are summarized in Table 1 below.

Embodiment 8

[0220] (Manufacture of optical film using solution casting film forming equipment)

[0221] When producing a cellulose acylate film which is an optical film of the present invention having a target dry film thickness of 80 μm by a solution casting film forming apparatus, first, a dope is prepared.

[0222] (mastic composition)

[0223] 100 parts by weight of cellulose ester

[0224] 8 parts by weight of triphenyl phosphate

[0225] 2 parts by weight of ethyl phthalate acetyl glycolate

[0226] チヌビン 109 (manufactured by Chiba Specialty Chemicals Co., Ltd.)

[0227] 0.5 parts by weight

[0228] チヌビン 171 (manufactured by Chiba Specialty Chemikaruzu Co., Ltd.)

[0229] 0.5 parts by weight

[0230] Dichloromethane 300 parts by weight

[0231] 60 parts by weight of ethanol

[0232] Put the above materials into a closed mucilage dissolving tank, and heat and stir to dissolve completely. In a...

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Abstract

An optical film comprising a cycloolefin resin or a cellulose ester resin, wherein at least one of edges of the optical film is slit; an average surface roughness Ra specified in JISB0601-2001 of a cross-section of the optical film formed by slitting is 0.05 to 0.9 mum; and a width of the optical film is 1400 mm or more.

Description

technical field [0001] The present invention relates to an optical film that can be used in various functional films such as a protective film for a polarizer used in a liquid crystal display (LCD), a retardation film, a viewing angle expansion film, and an antireflection film used in a plasma display. . [0002] The present invention relates to a wide optical film in which at least one end portion is cut, and particularly relates to an optical film excellent in uniformity of retardation value in the width direction. Background technique [0003] In recent years, liquid crystal display devices (LCDs) have been developed to be thinner and lighter, larger in screen size, and higher in definition. Along with this, protective films for polarizers are also strongly required to be thinner, wider, and higher in quality. With the improvement of image quality in liquid crystal displays, the quality requirements for optical films are also becoming stricter. [0004] In general, cell...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B1/04G02B1/10G02B5/30G02F1/1335
CPCB29C41/26B29K2001/00G02B1/105B29K2023/38B29K2001/12B29D7/01G02B5/3083B29C41/28G02B5/3033Y10T428/24355G02B1/14C09K2323/031F21V17/107F21V21/14F21K9/00F21Y2115/10
Inventor 清水和之杉谷彰一
Owner KONICA MINOLTA OPTO