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Methacrylic resin, methacrylic resin composition, film, production method

A methacrylic, resin composition technology, applied in instruments, optical components, optics, etc., can solve the problems of foaming during molding, low toughness, easy thermal decomposition, etc.

Active Publication Date: 2021-06-11
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, acrylic resins (heat-resistant acrylic resins) with improved heat resistance as described above tend to be thermally decomposed during high-temperature molding compared with general-purpose acrylic resins, that is, copolymers of methyl methacrylate and acrylate. Shortcomings
[0006] In addition, with the increase in size and thickness of molded products (film formation, etc.), molding under high temperature conditions and residence time under high temperature conditions become longer, so there is a disadvantage that foaming may occur during molding processing.
[0007] Furthermore, since heat-resistant acrylic resins have weak strength and low toughness, there is a problem of poor productivity from the viewpoint of film molding processability and handleability.

Method used

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  • Methacrylic resin, methacrylic resin composition, film, production method
  • Methacrylic resin, methacrylic resin composition, film, production method
  • Methacrylic resin, methacrylic resin composition, film, production method

Examples

Experimental program
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Embodiment

[0575] Hereinafter, specific examples and comparative examples are given and described, but the present invention is not limited to these examples.

[0576] [raw material]

[0577] The raw materials used in the following Examples and Comparative Examples are as follows.

[0578] [[Monomers constituting methacrylic resin]]

[0579] ・Methyl methacrylate (MMA): manufactured by Asahi Kasei Chemical Co., Ltd. (as a polymerization inhibitor, 2,4-dimethylformamide manufactured by Chugai Trading Co., Ltd. was added at 2.5 ppm) -6-tert-butylphenol (2,4-di-methyl-6-tert-butylphenol)).

[0580] · N-phenylmaleimide (N-PMI): manufactured by Nippon Shokubai Co., Ltd.

[0581] · N-cyclohexylmaleimide (N-CMI): manufactured by Nippon Shokubai Co., Ltd.

[0582] - Methyl 2-(hydroxymethyl)acrylate (MHMA): manufactured by Combi Bloks.

[0583] ·Acrylonitrile (AN)

[0584] [[Organic solvents]]

[0585] - m-xylene: manufactured by Mitsui Chemicals, Ltd.

[0586] ·Toluene

[0587] [[other]]...

manufacture example 1

[0742] In a 1.25m tank equipped with a stirring device with paddle-shaped wings, a temperature sensor, a cooling pipe, and a nitrogen introduction pipe 3 In the reactor, add 432.3kg of methyl methacrylate (MMA), 33.0kg of N-phenylmaleimide (PMI), 84.7kg of N-cyclohexylmaleimide (CMI), 450.0 kg of m-xylene and 100 parts by mass of n-octylmercaptan were dissolved with respect to 100 parts by mass of the total amount of all monomers to prepare a raw material solution. While blowing nitrogen therein, the temperature was raised to 125° C. while stirring.

[0743] Separately, an initiator supply solution obtained by mixing 0.23 kg of Perhexa C-75 and 1.82 kg of m-xylene was prepared.

[0744] When the raw material solution reached 127°C, the supply (addition) of the initiator supply solution (polymerization initiator mixed solution) was started according to the procedures (1) to (6).

[0745] (1) 0.0 to 0.5 hours: the supply rate is 1.00 kg / hour.

[0746] (2) 0.5 to 1.0 hours: th...

manufacture example 2

[0758] Add 530.8 kg of methyl methacrylate (MMA), 19.3 kg of N-phenylmaleimide (N-PMI), 450 kg of m-xylene, and 100 parts by mass relative to the total amount of all monomers. Except having used 200 mass ppm of n-octyl mercaptan, it carried out similarly to manufacture example 1.

[0759] The glass transition temperature of the obtained particles was 121°C.

[0760] In addition, the composition determined by NMR was MMA unit: 97% by mass, and PMI unit: 3% by mass.

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Abstract

A methacrylic resin composition and a film, the methacrylic resin composition is characterized in that it contains a methacrylic resin, and the methacrylic resin contains methacrylate mono Body unit (A) 50 to 97% by mass, structural unit (B) with a ring structure in the main chain 3 to 30% by mass, and other vinyl monomer units (C) that can be copolymerized with methacrylate monomers. ~20% by mass, the methacrylic resin satisfies the following conditions (1) ~ (2): (1) the weight average molecular weight measured by GPC is 65,000 ~ 300,000; (2) the weight average molecular weight obtained by GC / MS The total content of specific components is 0.01 to 0.40% by mass.

Description

technical field [0001] The present invention relates to an improved methacrylic resin, a methacrylic resin composition containing the resin, a film containing the same, and methods for producing them. Background technique [0002] In recent years, along with the expansion of the display market, the demand for clearer viewing of images has been increasing, and optical materials with higher optical characteristics in addition to transparency, heat resistance, and strength are required. [0003] As the optical material, acrylic resins ((meth)acrylate polymers) have been attracting attention from the viewpoints of transparency, surface hardness, optical properties, and the like. [0004] It has been reported that in acrylic resins, especially by copolymerizing glutaric anhydride (for example, see Patent Document 1), maleic anhydride (for example, see Patent Document 2) and the like with (meth)acrylate monomers, it has been reported that Acrylic resins with improved heat resista...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/12C08F2/00C08F222/10C08F222/40C08J5/18C08L33/04
CPCC08J5/18C08L33/04C08F2/38C08F220/14C08F8/32C08F8/48C08K5/13C08K5/41C08K5/52C08L33/12G02B1/041C08F222/402C08F120/14C08L33/10C08F220/40C08F220/44C08F212/08C08F222/40C08F220/18C08F220/20C08F2/48C08F220/56C08L2203/16C08F220/06
Inventor 村上史树多田裕栗原由寿加小林信博米村真实
Owner ASAHI KASEI KK