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Methacrylic resin composition

A methacrylic acid, resin-like technology, applied in instruments, optical components, optics, etc., can solve the problems of deterioration of molded body characteristics and reduced productivity, and achieve the effect of excellent light resistance and high heat resistance

Active Publication Date: 2020-11-03
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to prevent mold fouling, it is necessary to periodically clean the rolls, etc., thus reducing productivity
In addition, in a thin-walled molded article kneaded with an ultraviolet absorber, the ultraviolet absorber may ooze out to deteriorate the properties of the molded article.

Method used

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  • Methacrylic resin composition
  • Methacrylic resin composition
  • Methacrylic resin composition

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0344] (Manufacture example 1) (Manufacture of methacrylic resin [A-a])

[0345] The inside of a 5-L glass reaction container equipped with a stirring blade and a three-way cock was replaced with nitrogen gas. 1,600 g of toluene, 80 g of 1,2-dimethoxyethane, and isobutylbis(2,6-di-tert-butyl-4-methylphenoxy)aluminum at a concentration of 0.45 M were put into it at room temperature. 53.5 g (30.9 mmol) of a toluene solution and 6.17 g (10.3 mmol) of a solution of sec-butyllithium with a concentration of 1.3 M (solvent: 95% by mass of cyclohexane, 5% by mass of n-hexane). 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 conversion rate of methyl methacrylate at this point was 100%.

[0346] To the obtained solution, 1500 g of toluene was added and...

manufacture example 2

[0347] (Manufacture example 2) (Manufacture of methacrylic resin [A-b])

[0348] The inside of a 5-L glass reaction container equipped with a stirring blade and a three-way cock was replaced with nitrogen gas. 1,600 g of toluene, 80 g of 1,2-dimethoxyethane, and isobutylbis(2,6-di-tert-butyl-4-methylphenoxy)aluminum at a concentration of 0.45 M were put into it at room temperature. 73.3 g (42.3 mmol) of toluene solution and 8.44 g (14.1 mmol) of 1.3 M sec-butyllithium solution (solvent: cyclohexane 95%, n-hexane 5%). While stirring, 550 g of methyl methacrylate purified by distillation was added dropwise thereto at 15° C. over 30 minutes. After completion of dropping, it was stirred at 15° C. for 90 minutes. The color of the solution changed from yellow to colorless. The polymerization conversion rate of methyl methacrylate at this point was 100%.

[0349] To the obtained solution, 1500 g of toluene was added and diluted. Next, this diluted solution was poured into 100 kg...

manufacture example 3

[0350] (Manufacture example 3) (Manufacture of methacrylic resin [A-c])

[0351] The autoclave equipped with a stirrer and a collection tube was replaced with nitrogen. 100 parts by mass of purified methyl methacrylate, 0.0054 parts by mass of 2,2'-azobis(2-methylpropionitrile (dehydrogenation capacity: 1%, 1-hour half-life temperature: 83°C) and normal 0.203 parts by mass of octyl mercaptan was stirred to obtain a raw material liquid. Nitrogen gas was fed into the raw material liquid to remove dissolved oxygen in the raw material liquid.

[0352]Fill the tank reactor connected to the autoclave through pipes with the raw material liquid up to 2 / 3 of the capacity. The temperature was maintained at 140°C, and the polymerization reaction was first started in a batch mode. When the polymerization conversion rate reaches 55% by mass, the raw material liquid is supplied from the autoclave to the tank reactor at a flow rate with an average residence time of 150 minutes, and the rea...

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Abstract

A methacrylic resin composition comprising 75 to 99.8% by mass of methacrylic resin [A], 0.1 to 15% by mass of ultraviolet absorber [B], and 0.1 to 10% by mass of Compound [C] composed of 32,000 to 300,000 block copolymers or graft copolymers. A molded article comprising a methacrylic resin composition. A method for producing a film comprising: forming a film from a methacrylic resin composition using pinning in a melt extrusion method.

Description

technical field [0001] The present invention relates to a methacrylic resin composition. More specifically, the present invention relates to a methacrylic resin composition that can be melt-molded while suppressing mold fouling and the like, and is suitable for forming a molded article that does not easily bleed out additives such as ultraviolet absorbers. Background technique [0002] Methacrylic resins have high transparency and are useful as materials for moldings used in optical members, lighting members, billboard members, decorative members, and the like. In order to prevent deterioration of the methacrylic resin due to ultraviolet rays, an ultraviolet absorber is kneaded into the methacrylic resin. Since methacrylic resins have low compatibility with ultraviolet absorbers, when a large amount of ultraviolet absorbers are kneaded, transparency decreases. In addition, the kneaded ultraviolet absorber adheres to rolls, molds, etc. during melt molding, and may cause so-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L33/12C08F8/48C08F20/14C08K5/3475C08K5/3492C08L51/06C08L53/00
CPCC08F20/14C08K5/3475C08K5/3492C08L33/12C08L51/06C08L53/00C08F8/32C08F220/14C08F8/48C08J5/18B29C55/02G02B1/04G02B5/3083G02F1/133305
Inventor 阿部达中原淳裕
Owner KURARAY CO LTD
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