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Multilayer optical film, method for preparing same and polarizing plate comprising same

A multi-layer optical film and film technology, applied in the field of polarizers, can solve the problems of low glass transition temperature, negative impact on optical properties of optical films, and reduced heat resistance, and achieve high mechanical strength and impact strength, excellent The effect of UV absorption rate, high economic feasibility

Inactive Publication Date: 2015-03-04
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the ultraviolet absorber is added in excess as described above, in the case where the acrylic resin melted by receiving the high temperature and high pressure of the extruder in the process of producing the acrylic film is suddenly cooled in the casting and rolling process after passing through the T-die, The phenomenon of excessive migration, i.e., a phenomenon in which the UV absorber can decompose and be released to the outer surface of the film to stain the casting roll, may occur
As a result, pyrolyzed UV absorbers can also stain the film, thus, causing cosmetic defects in the film
[0007] Also, since UV absorbers known in the art may have a low molecular weight level and a low glass transition temperature, in the case where such UV absorbers are added in a large amount, the glass transition temperature of the composition may will be significantly reduced, so that the heat resistance may be reduced, or the optical properties of the optical film may be negatively affected thereby

Method used

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  • Multilayer optical film, method for preparing same and polarizing plate comprising same

Examples

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preparation Embodiment 1

[0102] (1) Preparation of resin composition

[0103]Prepare 1000g of a single compound consisting of 92 parts by weight of methyl methacrylate, 5 parts by weight of N-phenylmaleimide, 2 parts by weight of α-methylstyrene and 1 part by weight of methacrylate. body mixture, and with 2000 g of distilled water, 8.4 g of 5% polyvinyl alcohol solution (POVAL PVA217, produced by Kuraray), 0.1 g of boric acid, 2.5 g of n-octyl mercaptan and 1.5 g of 2,2'-azobis Isobutyronitrile was mixed in a 5 liter reactor and then dispersed in water while stirring at 400 rpm.

[0104] Next, preliminary polymerization was performed at 80° C., and the appearance of a polymerization peak was confirmed after suspension polymerization at 80° C. for 60 minutes. The temperature was raised to 115°C, and secondary polymerization was carried out for about 40 minutes. After performing the secondary polymerization as described above, the suspension was cooled to 30° C. to obtain a resin composition having po...

preparation Embodiment 2

[0110] A resin composition was prepared using the same components and the same method as in Preparation Example 1.

[0111] Next, the resin was used by the same method as in Preparation Example 1 except that 3 parts by weight of a triazole-based UV absorber (Tinuvin-326, produced by BASF) was used based on 100 parts by weight of the resin composition. Composition Raw material pellets were prepared.

preparation Embodiment 3

[0113] A resin composition was prepared using the same components and the same method as in Preparation Example 1.

[0114] Next, raw material pellets were prepared using the resin composition by the same method as in Preparation Example 1 except that the UV absorber was not used.

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Abstract

The present invention relates to a multilayer optical film, a method for preparing same, and a polarizing plate comprising same, wherein the multilayer optical film comprises: a first film layer formed of a thermoplastic acryl-based resin composition including 0.01 to 2.0 parts by weight of a triazine-based ultraviolet ray absorbing agent based on 100 parts by weight of a thermoplastic acryl-based resin composition; a second film layer formed of a thermoplastic acryl-based resin composition including 0.1 to 5.0 parts by weight of one or more ultraviolet ray absorbing agent(s) selected from the group consisting of triazole-based, benzophenon-based, oxanilide-based and cyanoacryl-based ultraviolet ray absorbing agents; and a third film layer formed of a thermoplastic acryl-based resin composition including 0.01 to 2.0 parts by weight of triazine-based ultraviolet ray absorbing agent.

Description

technical field [0001] The invention relates to a multilayer optical film, a preparation method thereof and a polarizer comprising the multilayer optical film. Background technique [0002] According to the development of optical technology in recent years, various optical technologies for display devices such as plasma display panel (PDP), liquid crystal display device (LCD), organic electroluminescent Devices (OED), etc., and have entered the market. Meanwhile, various polymer films such as polarizing films, polarizing protective films, retardation films, light guide plates, and plastic substrates are used for such display devices. The properties required for materials used in such display devices need to be further improved. [0003] Meanwhile, in polarizing plates currently used in image display devices such as liquid crystal display devices, triacetyl cellulose films (hereinafter, referred to as TAC films) are generally used as protective films for protecting polyviny...

Claims

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Application Information

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IPC IPC(8): G02B5/30
CPCG02B1/04C09D133/10G02B5/305C08L33/08
Inventor 严準槿李南贞郭相旻尹锡逸朴世晶
Owner LG CHEM LTD
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