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Orientation film making process, polarization film, polaroid and image display unit

A manufacturing method and a technology of an alignment film, applied in polarizing elements, optics, optical elements, etc., can solve problems such as narrowing of alignment film width, uneven thickness, and uneven orientation

Inactive Publication Date: 2002-12-11
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the above-mentioned dry stretching method, the width of the original non-oriented polyvinyl alcohol-based film is usually 400-2700 mm. When the original width of the non-oriented film is made wider than the original width, the stretching When the necking phenomenon increases, the width of the obtained alignment film becomes narrower
It is easy to produce uneven orientation and uneven thickness in the width direction, so that an oriented film with a high degree of orientation cannot be obtained

Method used

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  • Orientation film making process, polarization film, polaroid and image display unit
  • Orientation film making process, polarization film, polaroid and image display unit
  • Orientation film making process, polarization film, polaroid and image display unit

Examples

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Effect test

Embodiment 1

[0072] The moisture content of a polyvinyl alcohol film (average degree of polymerization: 2400) having a thickness of 75 μm and a width of 1000 mm was adjusted to 1.5% in a humidity-conditioning oven. by figure 2 In the manner shown, change the peripheral speed of the roller with a roller spacing of 100mm, a surface temperature of 30°C, and an outer diameter of 250mm (21: low speed) and a hot roller (22: high speed) with a surface temperature of 105°C and an outer diameter of 350mm, and perform 4.0 times the speed. Longitudinal uniaxial extension. Furthermore, heat treatment was performed for 10 seconds with a heating roll having a surface temperature of 130° C. to obtain an alignment film having a thickness of 21 μm.

Embodiment 2

[0074] The moisture content of a polyvinyl alcohol film (average degree of polymerization: 2400) having a thickness of 75 μm and a width of 1000 mm was adjusted to 1.5% in a humidity-conditioning oven. by figure 1 In the manner shown, heating was performed in a hot air oven at 105° C. with a roller pitch of 300 mm, and longitudinal uniaxial stretching was performed 4.0 times. Heat treatment was then performed for 10 seconds with a heated roll having a surface temperature of 105° C. to obtain an alignment film with a thickness of 22 μm.

Embodiment 3

[0076] The moisture content of the 75 μm thick, 400mm wide polyvinyl alcohol film (average degree of polymerization 2400) is adjusted to 1.5% by using a humidity-conditioning oven. figure 2 In the manner shown, change the peripheral speed of the roller with a roller spacing of 40mm, a surface temperature of 30°C, and an outer diameter of 180mm (21: low speed) and a hot roller (22: high speed) with a surface temperature of 105°C and an outer diameter of 180mm, and perform 4.0 times the speed. Longitudinal and uniaxial extension. Furthermore, heat treatment was performed for 10 seconds with a heating roll having a surface temperature of 105° C. to obtain an alignment film having a thickness of 22 μm.

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Abstract

A method for manufacturing an oriented film is to apply tension to an unoriented polyvinyl alcohol-based film by using the circumferential speed difference between the rollers in a state of heating, and carry out dry longitudinal uniaxial stretching, and the above-mentioned unoriented polyvinyl alcohol-based film is When the width of the film is taken as W, set the above-mentioned distance L between the rollers so that the value of L / W is below 0.6, carry out the above-mentioned stretching, and heat treatment at 60-160°C after stretching to manufacture an oriented film. By this method, even when the width of the original film is formed to be wide, an oriented film having a high degree of orientation can be produced.

Description

technical field [0001] The present invention relates to a method for producing an alignment film using a polyvinyl alcohol-based thin film for a polarizing film, a polarizing film and a polarizer produced by the method. Furthermore, it relates to image display devices such as liquid crystal display devices, organic EL display devices, and PDPs using the polarizing plate. Background technique [0002] As a polarizing film conventionally used in a liquid crystal display device or the like, a stabilizer film of a polyethylene film is used. As a method for producing the alignment film, there are a wet stretching method and a dry stretching method. In the wet stretching method, since the water content of the film affects the stretching, the stretching of the oriented film is prone to unevenness. On the other hand, in the dry stretching method, a stretching force is applied to a film heated to a temperature above the glass transition temperature according to the peripheral speed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B29C55/04B29C55/06B29K29/00B29L11/00C08J5/18G02F1/1335
CPCB29C55/06B29K2029/04B29K2995/0034Y10T428/31938Y10T428/31855B29C55/04
Inventor 西田昭博土本一喜近藤诚司
Owner NITTO DENKO CORP