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Laminated film and method for producing laminated film

A technology of laminated film and film thickness, applied in chemical instruments and methods, lamination, layered products, etc., can solve problems such as easy film breakage, and achieve the effect of not easy to wrinkle, uniform optical properties, and stable manufacturing

Active Publication Date: 2020-05-01
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using a raw film of polyvinyl alcohol-based resin with a thickness of 30 μm or less for thinning, there is a problem with productivity, such as the film tends to break during stretching.

Method used

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  • Laminated film and method for producing laminated film
  • Laminated film and method for producing laminated film
  • Laminated film and method for producing laminated film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0215]

[0216] (1) Substrate film

[0217] An unstretched polypropylene (PP) film (melting point: 163° C.) having a thickness of 90 μm was prepared as a base film. The tensile modulus of the base film at 80° C. was 205 MPa.

[0218] (2) Preparation of coating solution

[0219]Polyvinyl alcohol resin powder ("Z-200" manufactured by Nippon Synthetic Chemical Industry Co., Ltd., with an average degree of polymerization of 1100 and an average degree of saponification of 99.5 mol%) was dissolved in hot water at 95°C to prepare polyvinyl alcohol with a concentration of 3% by weight. Aqueous solution of vinyl alcohol. In the obtained aqueous solution, 1 part by weight of a crosslinking agent ("Sumirez Resin (registered trademark) 650" manufactured by Sumitomo Chemical Co., Ltd.) was mixed with respect to 2 parts by weight of the polyvinyl alcohol resin powder to obtain a coating solution for forming an undercoat layer. .

[0220] In addition, polyvinyl alcohol resin powder ("P...

Embodiment 2

[0246] In Example 1, the base film was changed to a polyethylene terephthalate (PET) film with a thickness of 38 μm, and no undercoat layer was formed on the base film, and the same operation was carried out. , making single-sided laminates. The average thickness in the width direction of the polyvinyl alcohol-based resin layer was 9.5 μm. At this time, in the thickness distribution (WET film thickness) of the coating layer in the width direction, the central part was about 3.3% thicker than both ends (the position 50 mm from the edge). In addition, in the film thickness distribution in the width direction of the resin layer, D1e−D1c=−0.32 μm.

[0247] The laminated film is wound up to obtain a laminated film roll, and then unwound from the laminated film roll to obtain a laminated film. At this time, wrinkles and slack were not confirmed at both ends in the width direction of the laminated film, but slack was confirmed at the center in the width direction.

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Abstract

The present invention relates to a laminated film and a method for manufacturing the laminated film. There is a problem that uneven dyeing occurs in the width direction due to wrinkles and slack, and both ends in the width direction cannot be used for polarizing plates. In addition, when wrinkles and slack occur in the polarizing laminated film obtained after the dyeing process, there is a problem that the protective film cannot be bonded and the polarizing plate cannot be stably manufactured. A solution of the present invention is a laminated film having a substantially unstretched polyvinyl alcohol-based resin layer on at least one side of a long base film, wherein the When the polyvinyl alcohol-based resin layer is equally divided into nine regions in the width direction, the average film thickness D1e of the outermost region and the average film thickness D1c of the central region satisfy the following formula. D1e-D1c≤-0.3μm.

Description

technical field [0001] The present invention relates to a laminated film and a method for producing the laminated film. Background technique [0002] Conventional polarizers are produced by stretching and dyeing a polyvinyl alcohol-based resin raw film (Japanese: 原内film) (usually about 30 to 75 μm in thickness), and the stretched film usually has a thickness of 12 to 30 μm. about. When a green film of a polyvinyl alcohol-based resin having a thickness of 30 μm or less is used for thinning, there is a problem in productivity such as the film is easily broken during stretching. [0003] Therefore, in order to cope with recent thinning of polarizing plates, a method of coating an aqueous solution containing a polyvinyl alcohol-based resin on a base film has been proposed. In this method, a polyvinyl alcohol-based resin layer is formed by coating an aqueous solution containing a polyvinyl alcohol-based resin on a base film, and after obtaining a laminated film, stretching and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30
CPCG02B5/305B32B27/16B32B27/306B32B43/006B32B2307/42B32B2038/0088B32B2329/04
Inventor 河村真一
Owner SUMITOMO CHEM CO LTD
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