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Optical film roll, method for producing same, polarizing plate, and display device

A manufacturing method and optical film technology, applied in the direction of polarizing elements, can solve the problems of difficulty in obtaining sufficient effects, fluctuations in embossing height, and differences in length directions, etc., achieve stable and uniform optical characteristics, and prevent the deterioration of the winding shape Effect

Active Publication Date: 2015-08-26
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has been known that in many cases, the embossed convex portion is deformed by the pressure after winding, so the fluctuation of the embossed height sometimes occurs and the expected effect cannot be obtained. In the case of an anisotropic optical film, the deformation of embossing is different in the left and right directions and in the longitudinal direction, and it is difficult to obtain a sufficient effect

Method used

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  • Optical film roll, method for producing same, polarizing plate, and display device
  • Optical film roll, method for producing same, polarizing plate, and display device
  • Optical film roll, method for producing same, polarizing plate, and display device

Examples

Experimental program
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Effect test

Embodiment 1

[0542]

[0543] Cellulose ester 1: acetyl substitution degree (total substitution degree of acyl groups) 2.88, weight average molecular weight Mw=220000, number average molecular weight Mn=90000, Mw / Mn=2.4

[0544] Cellulose ester 2: acetyl group substitution degree (total substitution degree of acyl group) 2.35, weight average molecular weight Mw=215000, number average molecular weight Mn=100000, Mw / Mn=1.5

[0545] Cellulose ester 3: acetyl substitution degree 1.50, propionyl substitution degree 0.90, total acyl substitution degree 2.40, weight average molecular weight Mw=160000, number average molecular weight Mn=100000, Mw / Mn=2.2

[0546]

[0547]

[0548] 10 parts by mass of Aerosil 972V (manufactured by Japan Aerosil Co., Ltd., average diameter of primary particles: 16 nm, apparent specific gravity: 90 g / liter) and 90 parts by mass of methanol were stirred and mixed with a dissolver for 30 minutes, and then dispersed with Manton-Gaulin , to obtain a particle dispers...

Embodiment 2

[0644] In the production of the roll body 102 of the optical film of Example 1, the magnification of the pre-stretching in the width direction (TD direction) was carried out under the conditions described in Table 2, and the optical film was produced in the same manner. Volumes 201-206.

[0645] With respect to the produced roll body of the optical film, the following haze evaluation was performed in addition to the evaluation of winding deviation and display unevenness performed in Example 1.

[0646] (haze)

[0647] The obtained optical film was conditioned at 23° C.·55% RH for 5 hours or more. Next, the haze of the obtained optical film was measured with a haze meter (turbidimeter) (model: NDH 2000, manufactured by Nippon Denshoku Co., Ltd.) in accordance with JIS K-7136 under the conditions of 23° C. and 55% RH. , and evaluated using the following criteria.

[0648] 〇: Haze less than 0.5%

[0649] △: Haze 0.5% to less than 1.0%

[0650] ×: Haze is 1.0% or more

[065...

Embodiment 3

[0657] In the production of the roll body 102 of the optical film of Example 1, the average crush resistance rate (%) of the left and right embossed parts was changed by adjusting the film thickness and the temperature of the embossing roll, and the roll of the optical film described in Table 3 was produced. Body 301-306.

[0658] With respect to the roll body of each optical film, the packaging forms of the following A to C (refer to Figure 10 . ), stored in a warehouse at 30 to 40° C. and 65 to 85% RH so that the longitudinal direction of the core (rolling core) becomes horizontal for 2 months. And similarly to Example 1, the winding state of the roll after 2 months was visually observed, and the winding deviation and the optical film were extracted from the roll of each optical film, and it produced similarly to Example 1. The circular polarizing plate and the organic EL image display device were evaluated for display unevenness.

[0659] Packaging Form A: A roll body o...

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Abstract

The present invention addresses the problem of providing an optical film roll which exhibits an elastic modulus within the plane of the film in an angled direction in relation to the lengthwise direction thereof, is unlikely to produce a shift in the rolling of the roll even due to moisture during storage or transport thereof, and has a uniform optical value even during storage or after transport thereof. This optical film roll is a lengthwise-oriented optical film roll in which the direction (A) having the maximum elastic modulus in the plane of the film is angled in relation to the lengthwise direction thereof, and the ratio of the values of the elastic modulus (EA) in the direction (A) having the maximum value to the elastic modulus (EB) in a direction (B) perpendicular to the direction (A) is 1.4≤EA / EB. The optical film roll is characterized by having an embossed section on both ends thereof having a height within the range of 1-20μm, and in that the crushing resistance (%) stipulated by formula (1) of the embossed sections is at least 50% for the embossed sections on both ends. (Formula 1) Crushing resistance (%) = D / Do×100% (Do and D are the heights of the projections before and after applying weight to the embossed sections.)

Description

technical field [0001] The present invention relates to a roll body of an optical film, its manufacturing method, a polarizing plate, and a display device. More specifically, it relates to a roll body of an optical film that is a film stretched in an oblique direction, and the roll body of the optical film does not easily cause winding deviation due to storage in a roll shape or moisture absorption during transportation. , and a roll body having an optical film having a uniform optical value that does not exhibit unevenness even if it is used in a polarizing plate during storage or after transportation, a production method thereof, a polarizing plate, and a display device. Background technique [0002] In order to manufacture a circularly polarizing plate by roll-to-roll, an optical film stretched in an oblique direction is proposed (for example, refer patent document 1.). Since this optical film is stretched in an oblique direction (simply, also referred to as oblique stre...

Claims

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Application Information

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IPC IPC(8): B65H75/00B29C55/04G02B5/30
CPCB29C55/04G02B5/30B29C55/12
Inventor 铃木真一郎村上隆
Owner KONICA MINOLTA INC
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