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Optical compensation film and retardation film

A technology of optical compensation film and phase difference film, which is applied in optics, optical components, nonlinear optics, etc., can solve the problems of complex manufacturing process and low production efficiency, and achieve the effect of excellent optical characteristics

Active Publication Date: 2011-04-20
TOSOH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] However, the methods proposed in Patent Documents 1 to 4 have a problem of low production efficiency because the manufacturing process is very complicated.

Method used

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  • Optical compensation film and retardation film
  • Optical compensation film and retardation film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0116] The present invention will be described in detail through examples below, but the present invention is not limited by these examples. In addition, unless otherwise specified, the reagents used were commercially available.

[0117] Composition of fumaric acid diester resin (fumaric acid diester copolymer)

[0118] Using a nuclear magnetic resonance measuring device (manufactured by Japan Electronics, trade name JNM-GX270), by proton nuclear magnetic resonance spectroscopy ( 1 H-NMR) spectral analysis to obtain.

[0119] Determination of number average molecular weight

[0120] Use mounted column (manufactured by Tosoh Corporation, trade name TSK-GEL GMH HR -H) Gel Permeation Chromatography (GPC) (manufactured by Tosoh Corporation, trade name HLC-8020), under the condition of column temperature 40 ℃, flow rate 1.0ml / min, THF is solvent, as standard polystyrene Find the converted value.

[0121] Determination of glass transition temperature (Tg)

[0122] Using a diff...

Synthetic example 1

[0133] Synthesis example 1 (production example of fumaric acid diester homopolymer)

[0134] In a 30-liter autoclave, 18 kg of distilled water containing 0.2% by weight of partially saponified polyvinyl alcohol, 3 kg of diisopropyl fumarate, and dimethyl-2,2'-azobisisobutyl as a polymerization initiator were added. 7 g of the acid ester was subjected to a suspension radical polymerization reaction at a polymerization temperature of 50° C. and a polymerization time of 24 hours. The obtained particles were filtered, washed sufficiently with methanol, and dried at 80° C. to obtain a homopolymer of diisopropyl fumarate. The number average molecular weight of the obtained diisopropyl fumarate homopolymer is 160,000.

Synthetic example 2

[0135] Synthesis example 2 (synthesis of fumaric acid diester copolymer)

[0136] In a 30-L autoclave equipped with a stirrer, a cooling pipe, a nitrogen inlet pipe, and a thermometer, 48 g of hydroxypropylmethylcellulose (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: Metronox 60SH-50) was added. , 15601 g of distilled water, 8161 g of diisopropyl fumarate, 240 g of 3-ethyl-3-oxetanylmethyl acrylate, and 45 g of tert-butyl peroxytrimethyl acetate as a polymerization initiator, and nitrogen gas was bubbled for 1 hour Thereafter, while stirring at 200 rpm, the radical suspension polymerization was carried out at 49° C. for 24 hours. After cooling to room temperature, the suspension containing the resulting polymer particles was centrifuged. The obtained polymer particles were washed twice with distilled water and twice with methanol, and then dried under reduced pressure at 80° C. (yield: 80%).

[0137] The number average molecular weight of the produced polymer pa...

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Abstract

To provide a retardation film and an optical compensation film which have excellent optical properties and are useful as a compensation film for compensating the contrast and viewing-angle characteristics of liquid-crystal displays and as an antireflection film. The invention provides: an optical compensation film or optical compensation layer which is a film or layer comprising a fumaric ester resin, the film or layer having three-dimensional refractive indexes satisfying the relationship nz>ny x, wherein nx is the refractive index in a fast-axis direction of the film plane or layer plane, ny is the refractive index in an in-plane direction perpendicular to the fast-axis direction, and nz is the refractive index in an out-of-plane vertical direction, the ratio of the retardation as measured at a wavelength of 450 nm to the retardation as measured at a wavelength of 550 nm (R450 / R550) being 1.1 or lower (film (A)) ; an optical compensation film which comprises the film (A) and a film (B) which has three-dimensional refractive indexes satisfying the relationship ny>nx z, wherein nx is the refractive index in a fast-axis direction of the film plane, ny is the refractive index in an in-plane direction perpendicular to the fast-axis direction, and nz is the refractive index in an out-of-plane vertical direction, and which has an in-plane retardation (Re) as measured at a wavelength of 550 nm of 50 nm or larger; a retardation film which is a film comprising a fumaric ester resin and in which when the refractive index in a fast-axis direction of the film plane, the refractive index in an in-plane direction perpendicular to the fast-axis direction, and the refractive index in an out-of-plane vertical direction are expressed by nx, ny, and nz, respectively, the refractive indexes satisfy the relationship nx<ny nz.

Description

technical field [0001] The present invention relates to an optical compensation film and a retardation film having a large refractive index in the thickness direction of the film, a large retardation in the film plane, a small wavelength dependence, etc., excellent optical properties, and effective in improving the contrast ratio and viewing angle characteristics of liquid crystal displays. technical background [0002] As the most important display device in the multimedia society, liquid crystal displays are widely used from mobile phones to computer monitors, notebook computers, and televisions. In order to improve display characteristics, liquid crystal displays use many optical films. In particular, the retardation film plays a major role in improving contrast and compensating color tone when viewed from the front or obliquely. As a conventional retardation film, polycarbonate or cyclic polyolefin is used, but these polymers are all polymers having positive birefringen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/13363G02B1/10G02B5/30G02B1/04C08J5/18C08L35/00
Inventor 土井亨下里伸治小原直人
Owner TOSOH CORP