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Laminated film, manufacturing method of laminated film, manufacturing method of polarized laminated film, and manufacturing method of polaroid

A manufacturing method and a technology of laminated films, which are applied in the field of polarizer manufacturing, can solve problems such as unevenness, no optical stripes found, and difficulty in measuring thickness unevenness.

Active Publication Date: 2016-10-12
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the form of coating an aqueous solution containing polyvinyl alcohol-based resin on the base film, the thickness of the resin layer composed of polyvinyl alcohol-based resin is measured by the following two methods, and the correct one composed of polyvinyl alcohol-based resin Needless to say, the thickness measurement of the resin layer, the measurement of thickness unevenness is difficult
Therefore, the cause of optical fringe unevenness and the method of controlling the cause have not yet been found

Method used

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  • Laminated film, manufacturing method of laminated film, manufacturing method of polarized laminated film, and manufacturing method of polaroid
  • Laminated film, manufacturing method of laminated film, manufacturing method of polarized laminated film, and manufacturing method of polaroid
  • Laminated film, manufacturing method of laminated film, manufacturing method of polarized laminated film, and manufacturing method of polaroid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0184]

[0185] (1) Substrate film

[0186] As the base film, an unstretched polypropylene (PP) film (melting point: 163° C.) with a thickness of 90 μm was prepared. The tensile elastic modulus in 80 degreeC of this base film was 205 MPa.

[0187] (2) Preparation of coating solution for primer layer formation

[0188] Polyvinyl alcohol powder (“Z-200” manufactured by Nippon Synthetic Chemical Industry Co., Ltd., average degree of polymerization 1100, average degree of saponification 99.5 mol%) was dissolved in hot water at 95° C. to prepare an aqueous solution of polyvinyl alcohol having a concentration of 3% by weight. In the obtained aqueous solution, 1 part by weight of a crosslinking agent ("Sumirez Resin (registered trademark) 650" manufactured by Taoka Chemical Industry Co., Ltd.) was mixed with respect to 2 parts by weight of polyvinyl alcohol powder to obtain a coating solution for forming a primer layer. .

[0189] (3) Preparation of aqueous solution containing p...

Embodiment 2

[0211] In the single-sided laminated product of Example 1, the number of guide rollers in the drying zone of the aqueous solution containing polyvinyl alcohol-based resin was set to three, and dried at 90°C for 5 minutes in a drying oven. 1 Similarly, a resin layer made of polyvinyl alcohol-based resin with a thickness of 9.6 μm was formed on the primer layer. The dew point in the drying oven was 26°C. Before the third roll, touch the coating layer with your fingers to confirm that there is no moisture, so it can be judged that the resin layer has cured.

[0212] The film thickness distribution in the width direction was obtained at a measurement interval of 0.83 mm. The maximum amplitude of the film thickness in the width direction was 0.6 μm. In addition, the periodic strength of the film thickness distribution at this time was 0.03.

[0213] A polarizing plate was produced in the same manner as in Example 1 except that it was in a single-sided laminated state. In particul...

Embodiment 3

[0215] In the single-sided laminate product of Example 2, the number of guide rollers in the drying zone of the aqueous solution containing polyvinyl alcohol-based resin was set to 1, and dried at 90° C. for 5 minutes in a drying oven. 2 Similarly, a resin layer made of polyvinyl alcohol-based resin with a thickness of 9.4 μm was formed on the primer layer. The dew point in the drying oven was 27°C. Before the exit of the drying oven, the coating layer was touched with a finger to confirm that no moisture was felt, so it was judged that the resin layer had cured.

[0216] The film thickness distribution in the width direction was obtained at a measurement interval of 0.86 mm. The maximum amplitude of the film thickness in the width direction was 0.7 μm. In addition, the periodic strength of the film thickness distribution at this time was 0.06.

[0217] A polarizing plate was produced in the same manner as in Example 1 except that it was in a single-sided laminated state. In...

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Abstract

The invention provides a laminated film, a manufacturing method of laminated film, a manufacturing method of polarized laminated film, and a manufacturing method of a polaroid. For the laminated film, a resin layer made of polyethylene alcohol resin is formed on a substrate membrane. The laminated film will not generate uneven optical strips when being assembled to a polaroid. The laminated film is prepared by forming a resin layer made of polyethylene alcohol resin on a long strip liked substrate membrane. The maximal amplitude of width of the resin layer in the width direction is 2.0 [mu]m or less.

Description

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

Claims

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Application Information

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IPC IPC(8): G02B1/10G02B5/30
Inventor 河村真一
Owner SUMITOMO CHEM CO LTD
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