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Manufacturing method of optical laminate

A technology for optical laminates and manufacturing methods, applied in chemical instruments and methods, optics, optical components, etc., can solve the problems of reduced transparency of thermoplastic resin substrates, and achieve full crystallization and efficient crystallization effects

Active Publication Date: 2022-07-19
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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  • Manufacturing method of optical laminate
  • Manufacturing method of optical laminate
  • Manufacturing method of optical laminate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] As the thermoplastic resin substrate, amorphous polyethylene terephthalate (IPA copolymerized PET) having a thickness of 100 μm, a crystallinity index of 0 to 0.1, and 5 mol % of isophthalic acid units having a Tg of 75° C. copolymerized was used. The surface of the film was corona treated (58W / m 2 / min). Prepared to contain acetoacetyl-modified PVA (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name: GOHSEFIMER Z200, average degree of polymerization: 1200, degree of saponification: 98.5 mol% or more, degree of acetoacetylation: 5) at a ratio of 1:9 %) and PVA (average degree of polymerization: 4200, degree of saponification: 99.2 mol%), and with respect to 100 parts by weight of this PVA-based resin, 13 parts by weight of potassium iodide was added to prepare a PVA-based resin aqueous solution (PVA Resin-like concentration: 5.5% by weight). This aqueous solution was apply|coated to the corona-treated surface of a resin base material so that the ...

Embodiment 2

[0114] The temperature adjustment of the first roll R1 from the upstream side was turned off, the temperature of the rolls R2 to R4 was set to 90° C., and the contact time of the laminate and the heating rolls R2 to R4 was set to 3 seconds each (total: 9 seconds). 3 seconds (total: 6 seconds) for each of the contact times with the heating rollers R5 to R6, and hot air was sent so that the atmospheric temperature in the oven for the second crystallization treatment would be 100°C. An optical laminate was produced in the same manner as in Example 1 except for the wind.

Embodiment 3

[0116] The temperature of R5 is set to 105°C, and hot air is blown so that the atmospheric temperature in the oven for the first crystallization treatment becomes 95°C, and the atmospheric temperature in the oven for the second crystallization treatment becomes 95°C. An optical laminate was produced in the same manner as in Example 1, except that the hot air was blown at 100°C.

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Abstract

The present invention provides a method for obtaining an optical laminate in which the transparency of a thermoplastic resin substrate is maintained and curling is suppressed. The method for producing an optical laminate of the present invention includes: forming a polyvinyl alcohol-based resin layer on a thermoplastic resin substrate to produce a laminate; subjecting the polyvinyl alcohol-based resin layer to a stretching treatment and a dyeing treatment to produce a polarizing film; and The laminated body is subjected to contact heating, and the thermoplastic resin base material is subjected to crystallization treatment, the crystallization treatment includes: a first crystallization treatment stage, increasing the crystallinity index of the thermoplastic resin base material to a first predetermined value; And in the second crystallization treatment stage, the crystallinity index of the thermoplastic resin base material is set to a second predetermined value larger than the first predetermined value.

Description

technical field [0001] The present invention relates to a method for producing an optical laminate. 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 obtaining a polarizing film by stretching a laminate having a thermoplastic resin base material and a polyvinyl alcohol (PVA)-based resin layer and then immersing it in a dyeing solution has been proposed ( For example, Patent Document 1). By this method, since a thin polarizing film can be obtained, it can contribute to the thinning of the liquid crystal display device in recent years and attract attention. [0003] In addition, the polarizing film is usually produced by drying treatment after immersing a PVA-based resin film in a bath such as a dyeing bath or a crosslinking bath. However, as descri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/36C08J5/18G02B5/30B32B7/023B32B27/30B29C55/06B32B37/06
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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