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Method for producing multilayer laminated film

a laminated film and multi-layer technology, applied in the direction of synthetic resin layered products, packaging, polarising elements, etc., can solve the problems of insufficient prevention of bubble production between resin films, wrinkles or stripe-like irregularities can also be produced, etc., to achieve good appearance, prevent wrinkles or stripe-like irregularities, and high in-plane uniformity

Inactive Publication Date: 2010-08-19
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This method effectively prevents bubble formation and wrinkles, resulting in high-quality multilayer laminated films with improved in-plane uniformity and contrast, suitable for applications such as high-contrast liquid crystal displays.

Problems solved by technology

If the resin film and the transparent film are laminated according to the above lamination method, however, bubbles can be formed between the resin film and the transparent film in the resulting multilayer laminated film.
In addition, wrinkles or stripe-like irregularities can also be produced.
Even using this method, however, the production of bubbles cannot be sufficiently prevented between the resin film and the transparent film in the multilayer laminated film.

Method used

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  • Method for producing multilayer laminated film
  • Method for producing multilayer laminated film
  • Method for producing multilayer laminated film

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Polarizing Plate

[0164]A polarizing plate was prepared using the method shown in FIG. 1. The polarizing film was used as the resin film A, and the adhesive layer-attached TAC film was used as each of the first and second transparent films B1 and B2. The feeding of the adhesive layer-attached TAC film was performed in such a manner that the TAC film side was placed on the first metal roll b1 side and on the second metal roll b2 side. An iron roll with a diameter of 200 mm was used as each of the first metal roll b1 and the second metal roll b2. A roll with a diameter of 200 mm composed of an iron core and a rubber layer (with a hardness of 90 degrees and a thickness of 3 mm) provided around the iron core was used as each of the first elastic roll a1 and the second elastic roll a2.

[0165]The polarizing film and the adhesive layer-attached TAC film were fed between the first elastic roll and the first metal roll and bonded to each other under pressure so that a laminated f...

examples 2 to 18

[0168]Polarizing plates were obtained using the process of Example 1, except that the angle (θ1a) or (θ1b) made by the line of feeding of each film with the tangent line (y1), the angle (θ2a) or (θ2b) made by the line of feeding of each film with the tangent line (y2), or the lamination pressure was changed as shown in Table 1.

example 19

[0169]A polarizing plate was obtained using the process of Example 16, except that the rubber layer of each of the first elastic roll and the second elastic roll was replaced by a rubber layer with a hardness of 65 degrees.

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Abstract

A method for producing a multilayer laminated film comprising: laminating a resin film having a moisture percentage of 10% by weight to 60% by weight with a first transparent film and a second transparent film each having a moisture percentage of 0.5% by weight to 5% by weight to be bonded to both sides of the resin film through an adhesive or pressure-sensitive adhesive layer interposed therebetween; wherein the laminating comprising steps of: passing the resin film and the first transparent film between a pair of a first metal roll and a first elastic roll in such a manner that the first transparent film is placed on the first metal roll side so that they are bonded to each other under pressure to form a laminated film; and then, using the laminated film without winding up it and passing the laminated film and the second transparent film between a pair of a second metal roll and a second elastic roll in such a manner that the second transparent film is placed on the second metal roll side so that they are bonded to each other under pressure to form a multilayer laminated film. The method can prevent bubbles from being formed between the resin film and the transparent film.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is a continuation of U.S. application Ser. No. 11 / 826,112 filed on Jul. 12, 2007, which claims the benefit of priority from prior Japanese Patent Application number 2006-191765 filed Jul. 12, 2006, and from Japanese Patent Application number 2007-115605, filed Apr. 25, 2007, the entire contents of both being incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a method for producing a multilayer laminated film, which comprises bonding first and second transparent films each having a moisture percentage of 0.5 to 5% by weight to both sides of a resin film having a moisture percentage of 10 to 60% by weight through an adhesive or pressure-sensitive adhesive layer interposed therebetween.[0004]The production method of the present invention may be used to form a variety of multilayer laminated films. Specifically, the production method of the present ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B29C65/48
CPCB29C66/93451Y10T156/1741B29C66/93411B29C65/5057B29C65/52B29C66/342B29C66/45B29C66/737B29C66/81457B29C66/83413B29C66/83415B29C66/929B29C66/934B29K2001/00B29K2023/00B29K2023/06B29K2023/083B29K2023/12B29K2025/00B29K2027/06B29K2027/08B29K2029/04B29K2031/04B29K2033/12B29K2063/00B29K2067/00B29K2069/00B29K2071/00B29K2077/00B29K2079/08B29K2081/04B29K2081/06B29K2101/12B29K2105/0085B29K2105/0088B29K2705/00B29K2821/00B29K2905/12B29K2995/0026B29K2995/0034B29K2995/005B29L2009/00B32B27/30B32B37/0015B32B37/003B32B37/0053B32B37/12B32B37/206B32B2307/40B32B2309/06B29C66/939B29C65/482B29C65/4855B29C65/4865B29C65/48B29C65/4815B29C65/4825B29C65/483B29C65/00B29K2995/007B29C66/81264B29C66/73171B29C66/7332B29C66/7338B29C66/73711B29C66/7392B29C66/73921B29C66/7394B29C66/8122B29C66/73366B29C66/71B29C66/1122B29C66/723B29K2077/10B29K2067/003B29K2059/00B29K2055/02B29K2025/06B29K2023/38B29K2023/16B29K2023/086B29K2001/12B32B23/08G02B5/30
Inventor FUJITA, YUTAKATSUCHIMOTO, KAZUKIWADA, MORIMASASENOO, TOMOYUKIOOURA, TAKAFUMIIKESHIMA, KENTAROUMASUDA, TOMOAKI
Owner NITTO DENKO CORP
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