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Methods for producing polarizing laminate film and polarizing plate

A manufacturing method and a technology for laminating films, applied in polarizing elements, optics, instruments, etc., can solve problems such as poor film handling and adhesion

Active Publication Date: 2012-10-24
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under this composition, in the case of temporary winding after the primer layer is provided, blocking (compression between the wound films) may sometimes occur, and the primer layer may adhere to the film after the primer layer is provided. The guide rollers and pinch rollers for film transportation will cause problems in film transportation

Method used

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  • Methods for producing polarizing laminate film and polarizing plate
  • Methods for producing polarizing laminate film and polarizing plate
  • Methods for producing polarizing laminate film and polarizing plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0174] according to figure 2 The manufacturing method shown produces a polarizing plate.

[0175] (undercoat layer formation process)

[0176] As the base film, an unstretched polypropylene (PP) film having a thickness of 100 μm was used.

[0177] As a primer solution not containing a crosslinking agent, polyvinyl alcohol powder (manufactured by Nippon Gosei Chemical Industry Co., Ltd., saponification degree 99.5 mol%, trade name: Z-200) was dissolved in hot water at 95°C to prepare An aqueous solution in which the weight ratio of water: polyvinyl alcohol powder is 100:3. The obtained primer solution was coated on the corona-treated substrate film, and dried at 80° C. for 10 minutes to form a primer layer with a thickness of 0.3 μm.

[0178]The experiment shown below was performed about the base film in which this undercoat layer was formed, and the degree of blocking was confirmed.

[0179]

[0180] (1) A film coated with an undercoat layer having a size of 300 mm×220 ...

Embodiment 2

[0203] As the base film, an unstretched polypropylene film having a thickness of 100 μm was used in the same manner as in Example 1.

[0204] Polyvinyl alcohol powder (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., saponification degree 99.5 mol%, trade name: Z-200) was dissolved in hot water at 95°C to prepare water: The weight ratio of polyvinyl alcohol powder was 100: The aqueous solution of 3, and then, add and mix the epoxy-based cross-linking agent solution (Sumika Chemtex Co. , Ltd., trade name: Sumirez (registered trademark) Resin 650, aqueous solution with a solid content concentration of 30% by weight), and prepared as a primer solution. At this time, the concentration of the epoxy-based crosslinking agent (solid content) in the primer solution was 0.04% by weight.

[0205] The obtained primer solution was coated on the corona-treated substrate film, and dried at 80° C. for 10 minutes to form a primer layer with a thickness of 0.2 μm.

[0206] (Adhes...

Embodiment 3

[0225] In this example, as a cross-linking agent for the primer solution, "Orgatics-TC310 (trade name)" (manufactured by Matsumoto Pharmaceutical Co., Ltd., active ingredient (Chem. Structure: (HO) 2 Ti[OCH(CH 3 )COOH] 2 ) 44% by weight, isopropanol 40% by weight and water 16% by weight solution).

[0226] First, solution A was prepared by mixing water, isopropanol, and "Orgatics TC-310" so that the weight ratio of water:isopropanol:TC-310 was 85:15:7.5. Here, the weight ratio of TC-310 refers to the weight of the entire solution containing the organometallic compound.

[0227] In addition, 15 parts by weight of polyvinyl alcohol powder (manufactured by Kuraray Co., Ltd., saponification degree: about 80 mol%, trade name: KL506) was dissolved in 100 parts by weight of water at 80°C to prepare an aqueous solution of polyvinyl alcohol ( Solution B).

[0228] Solution A and solution B were mixed so that the weight ratio of solution A:solution B was 1.3:4 to prepare a primer s...

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Abstract

The present invention is a method for producing a polarizing laminate film that includes a base film, a primer layer, and a polarizer layer in this order, the method involving, in the following order: a step of forming a primer layer on one surface of a base film by coating a primer solution thereon; a step of forming a polyvinyl-alcohol-based resin layer on the primer layer and thereby preparing a laminate film that includes the base film, the primer layer, and the polyvinyl-alcohol-based resin layer in this order; a step of stretching the laminate film; and a step of dyeing the polyvinyl-alcohol-based resin layer of the laminate film with a dichroic dye and thereby making same into a polarizer layer. In said method, the concentration of epoxy-based cross-linking agent(s) in said primer solution is less than 0.1% by weight. The present invention can provide a polarizing-laminate-film production method that does not give rise to blocking even when the film is temporarily rolled up after forming the primer layer on the base film, does not cause the film to stick to conveyor rolls even in subsequent conveyance, and does not impair the adhesion between the base film and the polyvinyl-alcohol-based resin layer in the polarizing laminate film that has been produced.

Description

technical field [0001] The present invention relates to a method for producing a polarizing laminated film and a polarizing plate. Background technique [0002] Polarizing plates are widely used as polarization supply elements and the like in display devices such as liquid crystal display devices. As the above-mentioned polarizing plate, a polarizing plate in which a protective film formed of triacetyl cellulose (TAC) is adhered to a polarizing film (polarizer layer) formed of a polyvinyl alcohol (PVA)-based resin has conventionally been used. The development of mobile devices such as notebook personal computers and mobile phones with liquid crystal display devices requires thinner walls and lighter weights. [0003] Conventionally, a polarizing film is produced by stretching a film made of polyvinyl alcohol-based resin alone or while stretching, dyeing and crosslinking, and laminating it on a protective film or the like to produce a polarizing film. However, the plate can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30
CPCG02B5/305G02B5/30C08J5/18
Inventor 河村真一
Owner SUMITOMO CHEM CO LTD
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