Stretched multilayer thermoplastic resin film

A technology of thermoplastic resin and stretched film, applied in the direction of synthetic resin layered products, layered products, instruments, etc., can solve the problems of deterioration, easy increase of birefringence, appearance of film breakage, etc., and achieve moisture resistance and heat resistance Excellent, high light transmittance, excellent mechanical properties

Active Publication Date: 2018-09-28
MITSUBISHI GAS CHEM CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the stretched film of Patent Document 2, in order to obtain the required UV barrier properties, a large amount of ultraviolet absorber needs to be added. Therefore, there are problems such as roll contamination due to exudation of the ultraviolet absorber during film production, and continuous production. poor sex
[0007] In addition, in conventional stretched films, when the stretching temperature during stretching is low, the degree of orientation increases, so sufficient mechanical properties are easily obtained, but birefringence tends to increase. In some cases, the film may be broken during stretching
On the other hand, when the stretching temperature is high, the degree of orientation can be suppressed to a low level, so the increase in birefringence can be suppressed, but it is difficult to obtain sufficient mechanical properties. , the film may break or the appearance may deteriorate during stretching

Method used

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  • Stretched multilayer thermoplastic resin film
  • Stretched multilayer thermoplastic resin film
  • Stretched multilayer thermoplastic resin film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0079] Hereinafter, the present invention will be specifically described by way of examples. However, the present invention is not limited by these Examples and Comparative Examples. The thermoplastic resin laminated stretched films obtained in Examples and Comparative Examples were evaluated as follows.

[0080]

[0081] For the thermoplastic resin obtained in the following synthesis examples, it was determined from the decrease rate of the absorption at 260 nm in the UV spectrum measurement before and after the hydrogenation reaction. From the absorbance A1 at the resin concentration C1 before the hydrogenation reaction, and the absorbance A2 at the resin concentration C2 after the hydrogenation reaction, it is calculated by the following formula.

[0082] Hydrogenation rate = 100×[1-(A2×C1) / (A1×C2)]

[0083]

[0084] For the thermoplastic resin obtained in the following synthesis example, the dielectric polarization difference of the bonding unit of each structural un...

manufacture example 1

[0110] Production example 1 [production of methacrylic resin (A1)]

[0111] 100 parts by weight of methyl methacrylate (Sumitomo Chemical Co., Ltd. SUMIPEX MG5 (intrinsic birefringence: -0.0043, glass transition temperature: 105°C)) and 1.2 parts by weight of a triazine-based ultraviolet absorber (ADEKA Co., Ltd. Production of ADEKA STAB LA-F70) is continuously introduced into a twin-screw extruder with a shaft diameter of 30mm, and extruded at a barrel temperature of 250°C and a discharge speed of 25kg / h to obtain methyl methacrylate added with ultraviolet rays Absorbent methacrylic resin (A1).

Embodiment 1

[0112] Example 1 [resin (B1) / resin (A1) / resin (B1), layer ratio 1:3:1, stretching temperature 150°C]

[0113] Use the multi-layer extruding device that has the single-screw extruder of shaft diameter 32mm, the single-screw extruder of shaft diameter 65mm, the feed block that links with full extruder and the T die that links with feed block, form stack layers. The vinyl copolymer resin (B1) obtained in Synthesis Example 1 was continuously introduced into a single-screw extruder with a shaft diameter of 32 mm, and extruded at a barrel temperature of 250° C. and a discharge rate of 24.0 kg / h. Further, the methacrylic resin (A1) obtained in Production Example 1 was continuously introduced into a single-screw extruder with a shaft diameter of 65 mm, and extruded at a cylinder temperature of 250° C. and a discharge rate of 36.0 kg / h. The feed block connected to the full extruder is equipped with two types of three-layer distribution pins, and the temperature is set at 250°C, and th...

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Abstract

This invention can provide a stretched multilayer thermoplastic resin film comprising a layer including a thermoplastic resin (B) layered on at least one surface of a layer including a methacrylate resin (A), said stretched multilayer thermoplastic resin film being characterized in that: methyl methacrylate constitutes at least 90 mol% of all constituent units in the methacrylate resin (A); the intrinsic birefringence of the thermoplastic resin (B) is from -0.005 to 0.005; and the glass transition temperature TgA (DEG C) of the methacrylate resin (A) and the glass transition temperature TgB (DEG C) of the thermoplastic resin (B) satisfy the expression 5DEG C<(TgB-TgA)<50DEG C.

Description

technical field [0001] The present invention relates to a thermoplastic resin laminated stretched film suitable for optical applications such as polarizer protective films. Background technique [0002] In a liquid crystal display device, a polarizing plate is used to convert transmitted light into linearly polarized light. A polarizing plate is usually composed of three layers in which a polarizer protective film is bonded to both sides of a polarizer. [0003] As a polarizer, a uniaxially oriented film in which iodine or a dye is adsorbed and dispersed in polyvinyl alcohol (hereinafter abbreviated as "PVA") is generally used, but such a PVA-based polarizer has low mechanical properties and is easily damaged by heat. It shrinks due to moisture or moisture, and the polarizing function is reduced. Therefore, it is used as a laminate with polarizer protective films bonded on both sides. The polarizer protective film needs to have no birefringence, high light transmittance, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/30B29C55/12C08F220/12G02B5/30B29K33/00B29L9/00B29L11/00
CPCB29C55/12G02B1/14G02B5/305C08L33/12C08F220/14C08F212/08B32B27/08B32B27/30C08F220/12G02B5/30B32B2307/518B29C48/08B29C48/21B29C48/0018B29K2033/12B29K2105/0005B29K2105/0085B29K2995/0026B29K2995/0053B32B27/308B32B2250/02B32B2250/246B32B2307/412B32B2307/42B32B2307/584C08J5/18C08J2333/12C08J2433/12C08L2205/025
Inventor 田桑谦小池信行
Owner MITSUBISHI GAS CHEM CO INC
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