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Multilayer film, polarization plate, and multilayer film production method

A manufacturing method and multi-layer film technology, applied in polarizing elements, chemical instruments and methods, coatings, etc., can solve problems such as difficulty in resistance to cohesion and damage, adhesion (adhesive strength may not be sufficient, etc.), and achieve full adhesion. The effect of sex, effective manufacturing

Active Publication Date: 2016-08-03
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, a retardation film obtained by stretching a retardation film comprising a polymer having an alicyclic structure has a problem in that it differs from, in particular, a retardation film made of polyvinyl alcohol ( Adhesion (adhesion strength) between polarizers formed of PVA) etc. may not be sufficient
[0005] However, since birefringence caused by molecular orientation is a fundamentally necessary characteristic of a retardation film, it is very difficult to exhibit birefringence while ensuring resistance to aggregation damage

Method used

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  • Multilayer film, polarization plate, and multilayer film production method
  • Multilayer film, polarization plate, and multilayer film production method
  • Multilayer film, polarization plate, and multilayer film production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0230] (1-1. Manufacture of film formed from layer A)

[0231] Pellets of a resin containing a norbornene-based polymer (glass transition temperature: 137° C.; “ZEONOR 1420R” manufactured by ZEON CO., LTD.) were dried at 100° C. for 5 hours. Then, pellets of the dried resin were fed to a single screw extruder. After the resin is melted in the extruder, it is extruded in sheet form from a T die onto a casting drum through a polymer conduit and a polymer filter, and cooled. Thus, a film having a thickness of 50 μm and a width of 675 mm was obtained.

[0232] (1-2. Preparation of water-based resin composition 1)

[0233] As an aqueous dispersion of polyurethane (a polymer having a polar group as a functional group (polymer Y1)), Superflex (glass transition temperature-35°C; manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd., carbonate-based polyurethane), 100 parts of polyurethane were included, and 20 parts of Denacol EX-521 (manufactured by Nagase ChemteX Co., Ltd.) as a...

Embodiment 2

[0238] In the process (1-3) of Example 1, the coating thickness of the liquid aqueous resin composition 1 in the process (1-2) was changed so that the dry film thickness might be 0.6 micrometers. Except for the above, it carried out like Example 1. Thus, the thickness of layer A is 20 μm, the thickness of layer B is 0.23 μm, the orientation coefficient of layer A is 0.004, the loss elastic modulus of layer A is 0.36 GPa, the loss elastic modulus of layer B is 0.4 GPa, the storage elastic modulus of layer A is 5.46 GPa, Multilayer film 2 with a storage elastic modulus of 3.49GPa in layer B. Moreover, the peel strength measurement result was 0.5 N or more, and it was favorable.

Embodiment 3

[0240] In the process (1-3) of Example 1, the coating thickness of the liquid aqueous resin composition 1 in the process (1-2) was changed so that the dry film thickness might be 2.5 micrometers. Except for the above, it carried out like Example 1. Thus, the thickness of layer A is 20 μm, the thickness of layer B is 1 μm, the orientation coefficient of layer A is 0.004, the loss elastic modulus of layer A is 0.36 GPa, the loss elastic modulus of layer B is 0.47 GPa, the storage elastic modulus of layer A is 5.46 GPa, and the elastic modulus of B layer is 5.46 GPa. A multilayer film 3 with a storage elastic modulus of 3.47 GPa. Moreover, the peel strength measurement result was 0.5 N or more, and it was favorable.

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Abstract

The invention discloses a multilayer film, a polarization plate, and a multilayer film production method. The multilayer film is provided with a layer (A) composed of a thermoplastic resin, and a layer (B) formed on at least one surface of the layer (A), wherein the layer (B) is composed using a material (Y) that contains a polymer having a glass transition temperature of -50 DEG to 40 DEG as the main component, and formulae (1)-(4) ((1) 2.5 X 10-3<Tb / T [alpha]< 1.0 X 10-1; (2) P>1.0X10-3; (3)Eb">E[alpha]"+0.01GP[alpha]; (4)Eb'<Ea'-1GP[alpha]) are satisfied by the following: the thickness (Ta) of the layer (A); the thickness (Tb) of the layer (B); the planar orientation coefficient (P) of the layer (A); the loss elastic modulus (Ea") of the layer (A); the loss elastic modulus (Eb") of the layer (B); the storage elastic modulus (Ea') of the layer (A); and the storage elastic modulus (Eb') of the layer (B).

Description

technical field [0001] The present invention relates to a multilayer film, a polarizing plate, a liquid crystal display device, and a method for producing a multilayer film, and particularly relates to a multilayer film, a polarizing plate, and a liquid crystal display that have sufficient adhesiveness over the entire surface and can be efficiently produced. Devices and methods of manufacturing multilayer films. Background technique [0002] In a liquid crystal display device, a retardation film is widely used in order to compensate the retardation caused by the birefringence of a liquid crystal cell. Retardation films of various configurations have been proposed so far, but retardation films that exhibit birefringence by stretching and orienting a transparent resin are widely used from the viewpoint of productivity and cost. Examples of such stretched films include cellulose triacetate excellent in cost and productivity, and films made of polycarbonate resin excellent in h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/00B29C55/08B32B27/40G02B5/30B29K79/00B29L7/00B29L9/00B29C48/08
CPCB29C55/08B32B27/08B32B2307/42B32B2307/51B32B2457/202G02B5/305B29D11/0073B32B27/306B32B27/325C09D175/06C08G18/44B32B2255/10B32B2255/26B32B2307/514B29C48/08B29C48/9135B32B27/40G02F1/133638B05D1/28B05D3/144B05D2201/02B05D2503/00B29C55/023B29K2675/00B29L2007/008B29L2009/005G02B5/3033G02B5/3083G02F1/133528G02F1/13363G02F2202/28G02F2413/01G02F2413/05
Inventor 摺出寺浩成
Owner ZEON CORP
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