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Methacrylic resin composition, method for producing same, molded body, film, and polarizing plate

A technology of methacrylic acid and methyl methacrylate, which is applied in the field of polarizing plates, can solve problems such as narrow molecular weight distribution, insufficient stretchability, and easy breakage, and achieve high transparency, small phase difference, and easy stretching Effect

Inactive Publication Date: 2017-03-01
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since these methacrylic resin compositions contain polycarbonate resins with low molecular weights to ensure transparency, their stretchability is not sufficient.
Specifically, it tends to break when it is further stretched into a film, and when stretched at a lower temperature in order to increase the strength of the stretched film, there is a problem that it tends to break.
In addition, in order to improve the heat resistance of the methacrylic resin composition, a methacrylic resin having a high syndiotacticity (rr) in terms of triads generally has a narrow molecular weight distribution, which is different from that of conventional methacrylic resins. Insufficient stretchability compared to methacrylic resin composition

Method used

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  • Methacrylic resin composition, method for producing same, molded body, film, and polarizing plate
  • Methacrylic resin composition, method for producing same, molded body, film, and polarizing plate
  • Methacrylic resin composition, method for producing same, molded body, film, and polarizing plate

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Experimental program
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preparation example Construction

[0115] The method for producing the above-mentioned methacrylic resin composition is not particularly limited. For example, a method in which a monomer mixture containing methyl methacrylate is polymerized to produce a methacrylic resin in the presence of a polycarbonate resin, a method in which a methacrylic resin and a polycarbonate resin are melt-kneaded method etc. Among them, the melt-kneading method is preferable because the process is simple. During melt kneading, other polymers and additives can be mixed as needed, or methacrylic resin can be mixed with polycarbonate resin after mixing with other polymers and additives, or polycarbonate resin can be mixed with other The polymer and additives are mixed with the methacrylic resin. Kneading can be performed using known mixing or kneading devices such as kneading extruders, extruders, mixing rolls, and Banbury mixers, for example. Among them, a twin-screw extruder is preferable. The temperature at the time of mixing an...

Embodiment

[0160] Hereinafter, although an Example and a comparative example demonstrate this invention concretely, this invention is not limited to a following example. In addition, the measurement of a physical property value etc. was implemented by the following method.

[0161] (polymerization conversion rate)

[0162] Inert CAP 1 (df=0.4 μm, 0.25mmI.D.×60m) manufactured by GL Sciences is connected to the gas chromatograph GC-14A manufactured by Shimadzu Corporation as a chromatographic column, and the following conditions are set: The temperature is 180°C, the detector temperature is set to 180°C, the column temperature is raised from 60°C (hold for 5 minutes) to 200°C at a temperature increase rate of 10°C / min, and the measurement is carried out for 10 minutes, and the polymerization is calculated based on the result. Conversion rate.

[0163] (weight average molecular weight (Mw), molecular weight distribution (Mw / Mn))

[0164] Regarding the Mw and molecular weight distribution...

manufacture example 1

[0205] The inside of a 5-L glass reaction container equipped with a stirring blade and a three-way cock was replaced with nitrogen gas. At room temperature, 1600 g of toluene, 2.49 g (10.8 mmol) of 1,1,4,7,10,10-hexamethyltriethylenetetramine, and isobutylbis(2,6-ditertiary 53.5 g (30.9 mmol) of a toluene solution of butyl-4-methylphenoxy)aluminum, and a solution of sec-butyllithium with a concentration of 1.3 M (solvent: 95% by mass of cyclohexane, 5% by mass of n-hexane ) 6.17g (10.3mmol). While stirring, 550 g of methyl methacrylate purified by distillation was added dropwise thereto at -20° C. over 30 minutes. After completion of the dropwise addition, the mixture was stirred at -20°C for 180 minutes. The color of the solution changed from yellow to colorless. The polymerization conversion rate of methyl methacrylate at this point was 100%.

[0206] To the obtained solution, 1500 g of toluene was added and diluted. Next, this diluted solution was poured into 100 kg of...

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PUM

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Abstract

Provided is a methacrylic resin composition which exhibits high transparency, has a low phase difference in the thickness direction, and can be easily stretched. This methacrylic resin composition contains: a methacrylic resin in which the content of structural units derived from methyl methacrylate is 80 mass % or higher and which has a weight average molecular weight of 200,000 or lower; a polycarbonate resin which has a viscosity average molecular weight of 1,000-32,000 and the content of which is 1-4 parts by mass relative to 100 parts by mass of the methacrylic resin; and a polymer processing aid which has an average degree of polymerization of 3,000-40,000 and the content of which is 0.3-6 parts by mass relative to 100 parts by mass of the methacrylic resin. The total quantity of the methacrylic resin and the polycarbonate resin contained in the methacrylic resin composition is 80 mass % or higher.

Description

technical field [0001] The present invention relates to a methacrylic resin composition containing a methacrylic resin and a polycarbonate resin. Moreover, it is related with the film containing the said methacrylic resin composition, a molded article, and the polarizing plate provided with the said film. Background technique [0002] Various resin films are used for liquid crystal display devices. Among them, triacetyl cellulose is mainly used for the polarizing plate protective film. A film containing triacetyl cellulose has a high water vapor transmission rate, and therefore tends to cause a decrease in the quality of a polarizing plate as film formation progresses. The improvement of a polarizing plate protective film becomes a subject in thinning a liquid crystal display device. [0003] Therefore, methacrylic resins have been studied as materials for new polarizer protective films. It is known that toughness is improved when a film containing a methacrylic resin is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/12B29C55/12C08F20/14C08J5/18C08L69/00G02F1/1335B29K33/04B29K69/00B29L7/00B29L11/00G02B5/30
CPCB29C55/12C08F20/14C08J5/18C08L33/12C08L69/00G02B5/30G02F1/1335
Inventor 中原淳裕阿部达善当利行高须贺悠贵
Owner KURARAY CO LTD
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