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Method for producing optical laminate

A technology for optical laminates and manufacturing methods, which is applied to chemical instruments and methods, optics, optical components, etc., can solve the problems of reduced transparency of thermoplastic resin substrates, and achieve full crystallization and high-efficiency crystallization effects

Active Publication Date: 2020-05-26
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, since the transparency of the thermoplastic resin substrate may be lowered by the drying treatment using the heating roller, it is not preferable from the viewpoint of using it as a protective film for a polarizing film without peeling and removing the thermoplastic resin substrate.

Method used

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  • Method for producing optical laminate
  • Method for producing optical laminate
  • Method for producing optical laminate

Examples

Experimental program
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Effect test

Embodiment 1

[0104] As the thermoplastic resin substrate, amorphous polyethylene terephthalate (IPA-copolymerized PET) having a thickness of 100 μm, a crystallization index of 0 to 0.1, and 5 mol % of isophthalic acid units having a Tg of 75° C. was copolymerized was used. Corona treatment (58W / m 2 / min). Prepare acetoacetyl-modified PVA (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name: GOHSEFIMER Z200) at a ratio of 1:9, average polymerization degree: 1200, saponification degree: 98.5 mol% or more, acetoacetylation degree: 5 %) and PVA (average degree of polymerization: 4200, saponification degree: 99.2 mole %) PVA-based resin, and relative to this PVA-based resin of 100 parts by weight, add 13 parts by weight of potassium iodide, prepared PVA-based resin aqueous solution (PVA Resin-like concentration: 5.5% by weight). This aqueous solution was applied to the corona-treated surface of the resin substrate so that the film thickness after drying was 13 μm, and dri...

Embodiment 2

[0114] Turn off the temperature adjustment of the first roller R1 from the upstream side, set the temperature of the rollers R2 to R4 to 90°C, and set the contact time between the laminate and the heating rollers R2 to R4 to 3 seconds (total: 9 seconds minutes), the contact time with the heating rollers R5 to R6 is set to 3 seconds (total: 6 seconds), and the hot air is sent in such a way that the atmosphere temperature in the second crystallization treatment oven becomes 100°C. An optical laminate was produced in the same manner as in Example 1 except the above.

Embodiment 3

[0116] The temperature of R5 was set to 105°C, and the hot air was blown so that the atmospheric temperature in the first crystallization oven was 95°C, and the atmosphere temperature in the second crystallization oven was 95°C. The optical laminated body was produced similarly to Example 1 except having blown hot air at 100 degreeC.

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Abstract

The present invention provides a method for obtaining an optical laminate in which curling is reduced while the transparency of a thermoplastic resin substrate is maintained. This method for producingan optical laminate includes forming a polyvinyl alcohol resin layer on a thermoplastic resin substrate to produce a laminate, performing a stretching process and a dyeing process on the polyvinyl alcohol resin layer to produce a polarizing film, and performing contact heating on the laminate and performing a crystallization process on the thermoplastic resin substrate, wherein the crystallization process includes a first crystallization process step in which the crystallinity index of the thermoplastic resin substrate is increased and set to a first prescribed value, and a second crystallization process step in which the crystallinity index of the thermoplastic resin substrate is set to a second prescribed value greater than the first prescribed value.

Description

technical field [0001] This invention relates to the manufacturing method of an optical laminated body. Background technique [0002] In a liquid crystal display device, which is a typical image display device, polarizing films are arranged on both sides of a liquid crystal cell due to its image forming method. As a method for producing a polarizing film, for example, a method of stretching a laminate having a thermoplastic resin substrate and a polyvinyl alcohol (PVA) resin layer and then immersing it in a dyeing solution to obtain a polarizing film has been proposed ( For example, Patent Document 1). Since a thinner polarizing film can be obtained by this method, it can contribute to the reduction in thickness of liquid crystal display devices in recent years, and has attracted attention. [0003] In addition, a polarizing film is usually produced by drying a PVA-based resin film after being immersed in baths such as a dyeing bath and a crosslinking bath. However, as de...

Claims

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Application Information

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IPC IPC(8): G02B5/30B29C55/06B32B7/02B32B7/023B32B27/30B32B27/36
CPCB29C55/06B32B7/02B32B7/023B32B27/30B32B27/36C08J5/18G02B5/30G02B5/3041
Inventor M.矢仙滨本大介池岛健太郎宫武稔
Owner NITTO DENKO CORP
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