JP2005179427A - Method for producing methacrylic resin particle - Google Patents

Method for producing methacrylic resin particle Download PDF

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JP2005179427A
JP2005179427A JP2003419421A JP2003419421A JP2005179427A JP 2005179427 A JP2005179427 A JP 2005179427A JP 2003419421 A JP2003419421 A JP 2003419421A JP 2003419421 A JP2003419421 A JP 2003419421A JP 2005179427 A JP2005179427 A JP 2005179427A
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polymerization
stirring
methacrylic resin
stirring blade
monomer
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JP3897020B2 (en
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Akiyoshi Kanemitsu
昭佳 金光
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Sumitomo Chemical Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing methacrylic resin particles, comprising efficiently stirring a monomer containing methyl methacrylate as a main component and an aqueous medium (3) in a polymerization vessel (2) equipped with a stirring blade (1) without causing violent coagulation, thereby suspending and simultaneously polymerizing the monomer in the aqueous medium, by which the methacrylic resin particles having small particle diameters can be produced. <P>SOLUTION: This method for producing the methacrylic resin particles comprises starting the polymerization, while stirring under such a condition that a particle velocity (V) represented by an equation (1): V=π×d×n (1) [(d) is the diameter (m) of a stirring blade; (n) is the number (sec- 1) of revolution of the stirring blade] is ≥2,3 m/sec, and then completing the polymerization, while stirring under such a stirring condition that the particle velocity (V) satisfies an equation (2): V=V<SB>0</SB>×2.3×D/10<SP>d</SP>(2) [V<SB>0</SB>is a particle velocity (m/sec) on the start of the polymerization; D is the inner diameter (m) of a polymerization vessel] during a polymerization degree of ≤25 %. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、メタクリル樹脂粒子の製造方法に関する。 The present invention relates to a method for producing methacrylic resin particles.

メチルメタクリレートを主成分とする単量体を水性媒体中に懸濁させた状態で重合させてメタクリル樹脂粒子を得る、いわゆる懸濁重合法は、メタクリル樹脂粒子の製造方法として広く用いられている方法である。懸濁重合による重合は通常、図1に示すような撹拌翼(1)を供えた重合容器(2)を用いて行なわれ、この重合容器(2)に単量体および水性媒体を導入し、場合によっては更に懸濁安定剤を導入して、攪拌翼(1)を回転させて、これら単量体および水性媒体(3)を撹拌翼(1)で撹拌することで、単量体を水性媒体中に懸濁させ、重合させている。 A so-called suspension polymerization method in which a monomer containing methyl methacrylate as a main component is polymerized in a state of being suspended in an aqueous medium to obtain methacrylic resin particles is a widely used method for producing methacrylic resin particles. It is. The polymerization by suspension polymerization is usually performed using a polymerization vessel (2) provided with a stirring blade (1) as shown in FIG. 1, and a monomer and an aqueous medium are introduced into this polymerization vessel (2). In some cases, a suspension stabilizer is further introduced, the stirring blade (1) is rotated, and the monomer and the aqueous medium (3) are stirred with the stirring blade (1), whereby the monomer is aqueous. Suspended in a medium and polymerized.

ここで、重合容器(2)としては、内径(D)が0.1m〜5m程度のものが一般的に使用される。また攪拌翼(1)としては通常、直径(d)が、重合容器の内径(D)に対して0.4倍〜0.8倍程度のものが用いられ、これ(1)をチップ速度(V)が4m/秒〜8m/秒程度となるように回転させたまま重合することによって、単量体および水性媒体(3)を攪拌することで、中心粒子径0.1〜0.5mm程度のメタクリル樹脂粒子が製造されている。高いチップ速度(V)で攪拌したり、懸濁安定剤の使用量を多くすると、得られるメタクリル樹脂粒子の粒子径は小さくなる。なお、チップ速度(V)〔m/秒〕は、攪拌翼の直径(D)〔m〕と回転数(n)〔秒-1〕とから式(1)
V = π × d × n (1)
により求められる。
Here, as the polymerization vessel (2), one having an inner diameter (D) of about 0.1 to 5 m is generally used. The stirring blade (1) usually has a diameter (d) of about 0.4 to 0.8 times the inner diameter (D) of the polymerization vessel. By stirring the monomer and the aqueous medium (3) by polymerization while rotating so that V) is about 4 m / second to about 8 m / second, the central particle diameter is about 0.1 to 0.5 mm. Methacrylic resin particles are manufactured. When stirring at a high tip speed (V) or increasing the amount of suspension stabilizer used, the particle diameter of the resulting methacrylic resin particles becomes small. The tip speed (V) [m / sec] is calculated from the formula (1) from the diameter (D) [m] of the stirring blade and the rotational speed (n) [sec- 1 ].
V = π × d × n (1)
Is required.

しかし、より小さな粒子径、例えば50μm以下の粒子径のメタクリル樹脂粒子を得ようとして、チップ速度を大きくしたまま重合させたり、懸濁安定剤を大量に添加して重合させたのでは、生成したメタクリル樹脂粒子が激しく凝集してしまうという問題があった。 However, in order to obtain a methacrylic resin particle having a smaller particle size, for example, a particle size of 50 μm or less, polymerization was carried out while increasing the chip speed, or polymerization was carried out by adding a large amount of a suspension stabilizer. There was a problem that methacrylic resin particles aggregated violently.

激しい凝集を招くことなく小粒子径の重合体粒子を製造する方法として、非特許文献1〔「乳化・分散プロセスの機能と応用技術」、(株)サイエンスフォーラム発行、1995年、第38頁〕には、ホモジナイザー、コロイドミルなどの乳化器により単量体を水性媒体中で1μm程度の微細な液滴として懸濁させたのち重合容器に移送し、重合開始剤を添加して重合させる方法が開示されているが、単量体および水性媒体の混合物は、懸濁したのちに重合容器に移送する必要があり、必ずしも効率的な製造方法ではない。 Non-Patent Document 1 ["Emulsification / Dispersion Process Function and Applied Technology", Science Forum, Inc., 1995, p. 38] In this method, the monomer is suspended as fine droplets of about 1 μm in an aqueous medium by an emulsifier such as a homogenizer or a colloid mill, then transferred to a polymerization vessel, and a polymerization initiator is added for polymerization. Although disclosed, a mixture of a monomer and an aqueous medium needs to be transferred to a polymerization vessel after being suspended, and is not necessarily an efficient production method.

「乳化・分散プロセスの機能と応用技術」、(株)サイエンスフォーラム発行、1995年、第38頁"Functions and applied technologies of emulsification and dispersion processes", Science Forum, Inc., 1995, p. 38

そこで本発明者は、激しい凝集を招くことなく、攪拌翼を備えた重合容器を用いて効率的に小粒子径のメタクリル樹脂粒子を製造し得る方法を開発するべく鋭意検討した結果、チップ速度が2.3m/秒以上となる条件で攪拌して単量体を懸濁させながら重合を開始したのち、重合率25%以下の間に所定の攪拌条件として攪拌しながら、重合を完結させれば、激しい凝集を招くことなく、小粒子径のメタクリル樹脂粒子を製造し得ることを見出し、本発明に至った。 Therefore, as a result of intensive investigations to develop a method capable of efficiently producing methacrylic resin particles having a small particle diameter using a polymerization vessel equipped with a stirring blade without causing intense aggregation, the inventor has found that the chip speed is high. After starting the polymerization while suspending the monomer by suspending under conditions of 2.3 m / sec or more and then stirring under predetermined stirring conditions while the polymerization rate is 25% or less, if the polymerization is completed The inventors have found that methacrylic resin particles having a small particle diameter can be produced without causing intense aggregation, and have led to the present invention.

すなわち本発明は、メチルメタクリレートを主成分とする単量体および水性媒体(3)を重合容器(2)内で攪拌翼(1)により攪拌し、前記単量体を水性媒体(3)中に懸濁させながら重合させて、メタクリル樹脂粒子を製造する方法であり、
式(1)
V = π × d × n (1)
〔式中、Vはチップ速度(単位はm/秒)を、dは攪拌翼の直径(単位はm)を、nは攪拌翼の回転数(単位は秒-1)をそれぞれ示す。〕
で示されるチップ速度(V)が2.3m/秒以上となるように攪拌しながら重合を開始させ、
次いで単量体の重合率が25%以下の間に、チップ速度(V)が式(2)
V ≦ 2.3 × D /10d × V0 (2)
〔式中、Dは重合容器の内径(m)を、V0は重合を開始させたときのチップ速度(単位はm/秒-1)をそれぞれ示し、dは攪拌翼の直径(単位はm)示す。〕
を満足する攪拌条件とし、
該攪拌条件で攪拌しながら重合を完結させることを特徴とするメタクリル樹脂粒子の製造方法を提供するものである。
That is, the present invention stirs the monomer mainly composed of methyl methacrylate and the aqueous medium (3) with the stirring blade (1) in the polymerization vessel (2), and the monomer is added to the aqueous medium (3). It is a method of producing methacrylic resin particles by polymerizing while being suspended,
Formula (1)
V = π × d × n (1)
[In the formula, V represents the tip speed (unit: m / second), d represents the diameter of the stirring blade (unit: m), and n represents the rotation speed of the stirring blade (unit: second -1 ). ]
The polymerization is started while stirring so that the chip speed (V) indicated by is 2.3 m / sec or more,
Next, while the polymerization rate of the monomer is 25% or less, the chip speed (V) is expressed by the formula (2).
V ≦ 2.3 × D / 10d × V 0 (2)
[In the formula, D represents the inner diameter (m) of the polymerization vessel, V 0 represents the tip speed (unit: m / sec −1 ) when polymerization was started, and d represents the diameter of the stirring blade (unit: m ) ]
And satisfying the stirring conditions,
The present invention provides a method for producing methacrylic resin particles, wherein the polymerization is completed while stirring under the stirring conditions.

図1および図2に、本発明の製造方法によるメタクリル樹脂粒子の製造に用いられる重合装置の一例を模式的に示す。図1は、重合装置の縦断面図であり、図2は、図1のA−A’断面における横断面図である。 1 and 2 schematically show an example of a polymerization apparatus used for production of methacrylic resin particles by the production method of the present invention. 1 is a longitudinal sectional view of the polymerization apparatus, and FIG. 2 is a transverse sectional view taken along the line A-A ′ of FIG. 1.

本発明の製造方法によれば、別途に乳化器などを用いることなく、撹拌翼を備えた重合容器を用いて激しい凝集を招くことなく、効率よく、例えば50μm以下、好ましくは20μm以下という小粒子径のメタクリル樹脂粒子を製造することができる。 According to the production method of the present invention, a small particle of, for example, 50 μm or less, preferably 20 μm or less can be efficiently used without using a separate emulsifier or the like and without causing intense aggregation using a polymerization vessel equipped with a stirring blade. Diameter methacrylic resin particles can be produced.

本発明の製造方法では、撹拌翼(1)を備えた重合容器(2)を用いて単量体を重合する。撹拌翼(1)としては、撹拌軸(11)に取り付けられたものが使用される。かかる攪拌翼(1)は撹拌軸(11)を回転軸として回転することで、重合容器(2)内の重合混合物(3)を撹拌する。撹拌翼(1)の形状は、重合中の重合混合物(3)を十分に撹拌できるものであればよく、タービン翼、ファウドラー翼、プロペラ翼などのような、通常の懸濁重合法に用いられる撹拌翼を用いることができる。かかる撹拌翼(1)は、撹拌軸(11)を電動モーター(図示せず)などによって回転させることで回転し、重合混合物(3)を撹拌する。攪拌翼(1)の直径(d)は通常、0.04m〜4mの範囲である。 In the production method of the present invention, a monomer is polymerized using a polymerization vessel (2) equipped with a stirring blade (1). As the stirring blade (1), one attached to the stirring shaft (11) is used. The stirring blade (1) rotates the stirring shaft (11) as a rotating shaft, thereby stirring the polymerization mixture (3) in the polymerization vessel (2). The shape of the stirring blade (1) is not particularly limited as long as the polymerization mixture (3) being polymerized can be sufficiently stirred, and is used in a usual suspension polymerization method such as a turbine blade, a Faudler blade, a propeller blade, or the like. A stirring blade can be used. The stirring blade (1) rotates by rotating the stirring shaft (11) with an electric motor (not shown) or the like, and stirs the polymerization mixture (3). The diameter (d) of the stirring blade (1) is usually in the range of 0.04 m to 4 m.

重合容器(2)としては、例えば内面(2a)が円筒形状をしている円筒状重合容器を用いることができる。重合容器の内径(D)は通常0.1m〜5m程度であり、通常は、攪拌翼の径(d)が重合容器の内径(D)に対して0.4倍〜0.8倍程度となる範囲である。かかる重合容器(2)には、重合中の重合混合物(3)が十分に混合されるように、バッフル(4)が備えられていてもよい。バッフル(4)の形状は、板状、棒状のものを用いることができる。バッフルを備える場合、その数は重合容器の容積に応じて適宜選択され、1個であってもよいが、十分な混合のために通常は2個以上が備えられ、また8個以下であることが好ましい。図1および図2に示す重合装置では、板状のバッフル(4)が6個、重合容器の内面に沿って設けられている。 As the polymerization vessel (2), for example, a cylindrical polymerization vessel whose inner surface (2a) has a cylindrical shape can be used. The inner diameter (D) of the polymerization vessel is usually about 0.1 to 5 m. Usually, the diameter (d) of the stirring blade is about 0.4 to 0.8 times the inner diameter (D) of the polymerization vessel. It is a range. The polymerization vessel (2) may be provided with a baffle (4) so that the polymerization mixture (3) being polymerized is sufficiently mixed. The shape of the baffle (4) can be a plate shape or a rod shape. When baffles are provided, the number thereof is appropriately selected according to the volume of the polymerization vessel and may be one, but usually two or more are provided for sufficient mixing, and the number is 8 or less. Is preferred. In the polymerization apparatus shown in FIG. 1 and FIG. 2, six plate-like baffles (4) are provided along the inner surface of the polymerization vessel.

単量体としては、メチルメタクリレートを主成分とする単量体が用いられ、単量体の全量、即ち100質量%がメチルメタクリレートであってもよいし、例えば50質量%以上がメチルメタクリレートであり、50質量%以下がメチルメタクリレートと共重合しうる単量体であってもよい。共重合しうる単量体は、分子内に重合性炭素−炭素二重結合を1個有する単官能単量体であってもよいし、2個以上有する多官能単量体であってもよい。 As the monomer, a monomer mainly composed of methyl methacrylate is used, and the total amount of the monomer, that is, 100% by mass may be methyl methacrylate, for example, 50% by mass or more is methyl methacrylate. 50 mass% or less may be a monomer copolymerizable with methyl methacrylate. The monomer that can be copolymerized may be a monofunctional monomer having one polymerizable carbon-carbon double bond in the molecule, or may be a polyfunctional monomer having two or more. .

単官能単量体としては、例えばメチルアクリレート、エチルアクリレート、プロピルアクリレート、ブチルアクリレート、2−エチルヘキシルアクリレート、ラウリルアクリレート、ベンジルアクリレート、シクロヘキシルアクリレート、ヒドロキシエチルアクリレート、ヒドロキシプロピルアクリレート、ヒドロキシブチルアクリレートなどのアクリル酸エステル、
エチルメタクリレート、プロピルメタクリレート、ブチルメタクリレート、2−エチルヘキシルメタクリレート、ラウリルメタクリレート、ベンジルメタクリレート、シクロヘキシルメタクリレート、ヒドロキシエチルメタクリレート、ヒドロキシプロピルメタクリレート、ヒドロキシブチルメタクリレートなどのメタクリル酸エステル、
アクリルアミド、アクリロニトリルなどの窒素含有アクリル系単量体、
メタクリルアミド、メタクリロにトリルなどの窒素含有メタクリル系単量体、
グリシジルアクリレート、グリシジルメタクリレートなどのエポキシ基含有単量体、
スチレン、α−メチルスチレンなどの芳香族ビニル単量体、
アクリル酸、メタクリル酸、マレイン酸、イタコン酸などの不飽和カルボン酸、
無水マレイン酸、無水イタコン酸などの不飽和カルボン酸無水物などが挙げられる。
Examples of monofunctional monomers include acrylic acid such as methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, lauryl acrylate, benzyl acrylate, cyclohexyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, and hydroxybutyl acrylate. ester,
Methacrylic acid esters such as ethyl methacrylate, propyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, lauryl methacrylate, benzyl methacrylate, cyclohexyl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxybutyl methacrylate,
Nitrogen-containing acrylic monomers such as acrylamide and acrylonitrile,
Methacrylamide, methacrylo and nitrogen-containing methacrylic monomers such as tolyl,
Epoxy group-containing monomers such as glycidyl acrylate and glycidyl methacrylate,
Aromatic vinyl monomers such as styrene and α-methylstyrene,
Unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, itaconic acid,
Examples thereof include unsaturated carboxylic acid anhydrides such as maleic anhydride and itaconic anhydride.

多官能単量体としては、例えばエチレングリコールジアクリレート、ジエチレングリコールジアクリレート、トリエチレングリコールジアクリレート、ポリエチレングリコールジアクリレート、ポリプロピレングリコールジアクリレート、1,3−ブチレングリコールジアクリレート、1,6−ヘキサンジオールジアクリレート、ネオペンチルグリコールジアクリレート、トリメチロールプロパントリアクリレート、テトラメチロールメタントリアクリレート、テトラメチロールメタントリアクリレート、テトラメチロールメタンテトラアクリレートなどの多価アルコールのアクリル酸エステル、
エチレングリコールジメタクリレート、ジエチレングリコールジメタクリレート、トリエチレングリコールジメタクリレート、ポリエチレングリコールジメタクリレート、ポリプロピレングリコールジメタクリレート、1,3−ブチレングリコールジメタクリレート、1,6−ヘキサンジオールジメタクリレート、ネオペンチルグリコールジメタクリレート、トリメチロールプロパントリメタクリレート、テトラメチロールメタントリメタクリレート、テトラメチロールメタントリメタクリレート、テトラメチロールメタンテトラメタクリレートなどの多価アルコールのメタクリル酸エステル、
アリルメタクリレート、ジビニルベンゼン、ジアリルフタレートなどが挙げられる。
Examples of the polyfunctional monomer include ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, polyethylene glycol diacrylate, polypropylene glycol diacrylate, 1,3-butylene glycol diacrylate, and 1,6-hexanediol diester. Acrylic esters of polyhydric alcohols such as acrylate, neopentyl glycol diacrylate, trimethylolpropane triacrylate, tetramethylol methane triacrylate, tetramethylol methane triacrylate, tetramethylol methane tetraacrylate,
Ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, polypropylene glycol dimethacrylate, 1,3-butylene glycol dimethacrylate, 1,6-hexanediol dimethacrylate, neopentyl glycol dimethacrylate, tri Methacrylic esters of polyhydric alcohols such as methylolpropane trimethacrylate, tetramethylol methane trimethacrylate, tetramethylol methane trimethacrylate, tetramethylol methane tetramethacrylate,
Examples include allyl methacrylate, divinylbenzene, and diallyl phthalate.

かかる単官能単量体および多官能単量体はそれぞれ単独で、または2種以上を組み合わせて用いられる。 Such monofunctional monomers and polyfunctional monomers are used alone or in combination of two or more.

水性媒体としては通常は、水が用いられるが、単量体を懸濁して重合できるのであれば、有機溶媒を含んでいてもよい。水性媒体の使用量は単量体の使用量に対して1質量倍以上であり、容積効率の点で通常は10質量倍以下、好ましくは5質量倍以下である。 As the aqueous medium, water is usually used, but an organic solvent may be included as long as the monomer can be suspended and polymerized. The amount of the aqueous medium used is 1 mass times or more with respect to the amount of the monomer used, and is usually 10 mass times or less, preferably 5 mass times or less in terms of volumetric efficiency.

水性溶媒には通常、懸濁安定剤が含有されている。懸濁安定剤としては、例えばポリメタクリル酸ナトリウム、メチルセルロース、ポリビニルアルコールなどの高分子分散剤、ドデシルベンゼンスルホン酸ナトリウム、ラウリル硫酸ナトリウム、アルキルナフタレンスルホン酸ナトリウム、ジアルキルスルホコハク酸ナトリウム、アルキルジフェニルエーテルジスルホン酸ナトリウムなどの陰イオン性界面活性剤、ポリオキシエチレンポリオキシプロピレンエーテル、ポリオキシエチレンラウリルエーテル、ポリオキシエチレンセチルエーテル、ポリオキシエチレンステアリルエーテル、ポリオキシエチレンアルキルエーテル、ポリオキシエチレンミリスチルエーテルなどのノニオン性界面活性剤、炭酸ナトリウム、リン酸水素2ナトリウム、リン酸2水素ナトリウム、硫酸ナトリウムなどの無機塩などが挙げられる。かかる懸濁安定剤の使用量は水100質量部あたり通常0.005質量部〜5質量部の範囲である。懸濁安定剤は、重合開始前に加えてもよいし、重合開始後に加えてもよい。 The aqueous solvent usually contains a suspension stabilizer. Suspension stabilizers include, for example, polymer dispersants such as sodium polymethacrylate, methylcellulose, polyvinyl alcohol, sodium dodecylbenzenesulfonate, sodium lauryl sulfate, sodium alkylnaphthalenesulfonate, sodium dialkylsulfosuccinate, sodium alkyldiphenylether disulfonate Nonionic surfactants such as anionic surfactants such as polyoxyethylene polyoxypropylene ether, polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene alkyl ether, polyoxyethylene myristyl ether Surfactants, sodium carbonate, disodium hydrogen phosphate, sodium dihydrogen phosphate, sodium sulfate, etc. Such as aircraft salts. The amount of the suspension stabilizer used is usually in the range of 0.005 to 5 parts by mass per 100 parts by mass of water. The suspension stabilizer may be added before the start of polymerization or may be added after the start of polymerization.

本発明の製造方法では、先ず重合容器(2)内で撹拌翼(1)によって単量体および水性媒体を攪拌しながら重合を開始させる。具体的には重合容器(2)に単量体および水性媒体を投入し、撹拌翼(1)を回転させて、撹拌すればよい。撹拌は上記式(1)で示されるチップ速度(V)が2.3m/秒以上、通常は8m/秒以下、好ましくは5m/秒以下で行われる。攪拌により単量体は水性媒体中に懸濁する。 In the production method of the present invention, first, polymerization is started in the polymerization vessel (2) while stirring the monomer and the aqueous medium with the stirring blade (1). Specifically, the monomer and the aqueous medium may be charged into the polymerization vessel (2), and the stirring blade (1) may be rotated and stirred. Stirring is performed at a tip speed (V) represented by the above formula (1) of 2.3 m / second or more, usually 8 m / second or less, preferably 5 m / second or less. The monomer is suspended in the aqueous medium by stirring.

上記のチップ速度で攪拌しながら重合を開始させるには、通常の撹拌重合と同様に、単量体および水性媒体に重合開始剤を添加し、重合温度に加熱すればよい。重合開始剤としては、通常の懸濁重合法と同様に、例えば2,2’−アゾビス(2,4−ジメチルバレロニトリル)、2,2’−アゾビスイソブチロニトリル、ジメチル−2,2’−アゾビスイソブチレートなどのアゾ系重合開始剤、
ベンゾイルパーオキシド、ラウリルパーオキシドなどの過酸化物系重合開始剤などを用いることができる。かかる重合開始剤はそれぞれ単独で、または2種以上を組み合わせて用いられる。重合開始剤の使用量は単量体の使用量100質量部あたり通常は0.01質量部〜2質量部の範囲である。
In order to start the polymerization while stirring at the above chip speed, a polymerization initiator may be added to the monomer and the aqueous medium and heated to the polymerization temperature in the same manner as in normal stirring polymerization. As the polymerization initiator, for example, 2,2′-azobis (2,4-dimethylvaleronitrile), 2,2′-azobisisobutyronitrile, dimethyl-2,2 are used in the same manner as in the usual suspension polymerization method. '-Azo polymerization initiator such as azobisisobutyrate,
Peroxide-based polymerization initiators such as benzoyl peroxide and lauryl peroxide can be used. Such polymerization initiators may be used alone or in combination of two or more. The amount of the polymerization initiator used is usually in the range of 0.01 to 2 parts by mass per 100 parts by mass of the monomer.

重合温度は、用いる重合開始剤の種類などによって異なるが、通常は60℃〜120℃の範囲である。 The polymerization temperature varies depending on the type of polymerization initiator used, but is usually in the range of 60 ° C to 120 ° C.

重合は、予め重合温度未満の温度で重合開始剤を単量体および水性媒体と混合しておいた後、重合温度まで昇温してもよいし、重合温度で攪拌されている状態の単量体および水性媒体の混合物に重合開始剤を投入してもよい。 The polymerization may be carried out in advance by mixing the polymerization initiator with the monomer and the aqueous medium at a temperature lower than the polymerization temperature, and then the temperature may be raised to the polymerization temperature. A polymerization initiator may be added to the mixture of the body and the aqueous medium.

重合を開始することで、単量体が重合してメタクリル樹脂粒子が生成すると共に単量体が減少するが、本発明の製造方法では、用いた単量体のうち重合された単量体の量を示す重合率が25%以下の間に、チップ速度(V)が上記式(2)を満足する攪拌条件とする。ここで、上記式(2)は本発明者が経験的に求めたものである。また上記のように懸濁重合に用いられる重合容器(2)は通常、内径(D)が0.1m〜5m程度であり、攪拌翼(1)が径(d)が0.04m〜4m程度であるので、上記式(2)を満足するチップ速度(V)は通常、重合を開始させたときのチップ速度(V0)よりも小さい。 By initiating the polymerization, the monomers are polymerized to produce methacrylic resin particles and the number of monomers decreases, but in the production method of the present invention, of the monomers used, While the polymerization rate indicating the amount is 25% or less, the stirring speed is set so that the tip speed (V) satisfies the above formula (2). Here, the above formula (2) is empirically obtained by the inventor. The polymerization vessel (2) used for suspension polymerization as described above usually has an inner diameter (D) of about 0.1 to 5 m, and the stirring blade (1) has a diameter (d) of about 0.04 to 4 m. Therefore, the tip speed (V) satisfying the above formula (2) is usually smaller than the tip speed (V 0 ) when the polymerization is started.

上記の攪拌条件とするのは、重合率が25%以下の間であればよく、重合が開始さえしていれば、重合開始直後であってもよい。攪拌条件の変更は、例えば攪拌翼の回転数(n)を低くすればよい。 The above stirring condition may be that the polymerization rate is between 25% or less, and may be immediately after the start of polymerization as long as the polymerization is started. The stirring conditions can be changed by, for example, reducing the rotation speed (n) of the stirring blade.

攪拌条件を変更した後、この攪拌条件のまま攪拌しながら重合を完結させる。重合を完結させるには、そのまま重合温度を保って、攪拌下に重合を進行させればよい。 After changing the stirring conditions, the polymerization is completed while stirring under the stirring conditions. In order to complete the polymerization, the polymerization temperature may be maintained as it is and the polymerization proceeds with stirring.

重合完了後、通常と同様に冷却し、固液分離することで、目的のメタクリル樹脂粒子を取り出すことができる。取り出されたメタクリル樹脂粒子は、水などで洗浄してもよい。 After completion of the polymerization, the target methacrylic resin particles can be taken out by cooling and solid-liquid separation as usual. The extracted methacrylic resin particles may be washed with water or the like.

以下、実施例によって本発明をより詳細に説明するが、本発明は、かかる実施例によって限定されるものではない。 EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited by this Example.

なお、重合中の重合率は、重合中の重合混合物から採取した試料を80℃で24時間乾燥させたときの重量変化から求めた。得られたメタクリル樹脂粒子中心粒子径(D50)は、メタクリル樹脂粒子を純水に分散させて、光散乱粒径測定装置〔Micro Track社製「FRA」〕を用いて測定し、メタクリル樹脂粒子が凝集している場合には、予め超音波を照射してから測定した。 The polymerization rate during polymerization was determined from the change in weight when a sample collected from the polymerization mixture during polymerization was dried at 80 ° C. for 24 hours. The obtained methacrylic resin particle central particle size (D 50 ) was measured by dispersing the methacrylic resin particles in pure water and using a light scattering particle size measuring apparatus (“FRA” manufactured by Micro Track). In the case where agglomerates were aggregated, the measurement was performed after irradiation with ultrasonic waves in advance.

実施例1
図1および図2に示すように、重合容器(2)として、内容積2dm3(2L)、内径(D)0.13mで円筒形状をした冷却器(図示せず)付きの容器を用いた。内部には、幅7mmで容器の内面(2a)に沿って底部(2b)から上方に至る板状のバッフル(4)を6個均等間隔で設けた。この重合容器(2)には、撹拌軸(11)に取り付けた撹拌翼(1)が備えられている。撹拌翼(1)としては、幅14mmの矩形状の平板を用い、図3に示すように撹拌軸(11)に対して45°の取付角度(θ)で取り付けたものを用いた。撹拌翼(1)の枚数は8枚とし、4枚ずつ2段で取り付けた。攪拌翼(1)の直径(d)は0.07mであった。また、2.3×D/10d(=α)は0.254である。
Example 1
As shown in FIG. 1 and FIG. 2, a polymerization vessel (2) having a cylindrical shape and a cooler (not shown) with an internal volume of 2 dm 3 (2 L) and an inner diameter (D) of 0.13 m was used. . Inside, six plate-like baffles (4) having a width of 7 mm and extending upward from the bottom (2b) along the inner surface (2a) of the container were provided at equal intervals. The polymerization vessel (2) is provided with a stirring blade (1) attached to the stirring shaft (11). As the stirring blade (1), a rectangular flat plate having a width of 14 mm was used, which was attached at a mounting angle (θ) of 45 ° with respect to the stirring shaft (11) as shown in FIG. The number of stirring blades (1) was eight, and four blades were attached in two stages. The diameter (d) of the stirring blade (1) was 0.07 m. Moreover, 2.3 × D / 10 d (= α) is 0.254.

この重合容器(2)にイオン交換水946.9g、ポリメタクリル酸ナトリウム(懸濁安定剤)0.344g、ドデシルベンゼンスルホン酸ナトリウム(懸濁安定剤)0.147g、ポリオキシエチレンポリオキシプロピレンエーテル(懸濁安定剤)3.93gおよびヒドロキシポリプロピルセルロース0.079gを投入し、溶解させた。次いでメチルメタクリレート374.4g、メチルアクリレート(単官能単量体)15.7g、エチレングリコールジメタクリレート(多官能単量体)2.36g、ターピノレン(重合調整剤)0.059g、ラウロイルパーオキシド(重合開始剤)1.18gおよびベンゾイルパーオキシド0.52gを混合、溶解させた混合物を加え、流速0.2dm3/分の窒素ガス(5)流通下に、撹拌翼(1)を初期回転数(n0)685rpm(11.4秒-1)にて回転させて30分間撹拌した。このときのチップ速度(V0)は2.51m/秒である。このときの系内の単量体および水性媒体の混合物の界面張力は1.5×10-5/m、密度は0.98g/cm3であった。 In this polymerization vessel (2), 946.9 g of ion-exchanged water, 0.344 g of sodium polymethacrylate (suspension stabilizer), 0.147 g of sodium dodecylbenzenesulfonate (suspension stabilizer), polyoxyethylene polyoxypropylene ether (Suspension stabilizer) 3.93 g and hydroxypolypropylcellulose 0.079 g were added and dissolved. Next, 374.4 g of methyl methacrylate, 15.7 g of methyl acrylate (monofunctional monomer), 2.36 g of ethylene glycol dimethacrylate (polyfunctional monomer), 0.059 g of terpinolene (polymerization regulator), lauroyl peroxide (polymerization) (Initiator) 1.18 g and benzoyl peroxide 0.52 g were mixed and dissolved, and a stirring blade (1) was rotated at an initial rotational speed (5) under a flow of nitrogen gas (5) at a flow rate of 0.2 dm 3 / min. n 0 ) The mixture was rotated at 685 rpm (11.4 sec −1 ) and stirred for 30 minutes. The chip speed (V 0 ) at this time is 2.51 m / sec. At this time, the interfacial tension of the mixture of the monomer and the aqueous medium in the system was 1.5 × 10 −5 / m, and the density was 0.98 g / cm 3 .

その後、窒素ガス流通下、撹拌翼を同回転速度で回転させながら昇温し、重合を開始させた。内容物の温度が65℃となった時点で、ポリオキシエチレンポリオキシプロピレンエーテル(懸濁安定剤)8.42gとイオン交換水25.25gとの混合物(溶液)を加え、さらに15分を経過した時点で撹拌翼(1)の回転数を減速した。減速後の回転数(n1)は150rpm(2.5秒-1)とした。このときのチップ速度(V1)は0.55m/秒であり、重合率は15.6%であった。 Thereafter, under a nitrogen gas flow, the temperature was raised while rotating the stirring blade at the same rotational speed to initiate polymerization. When the temperature of the contents reached 65 ° C., a mixture (solution) of 8.42 g of polyoxyethylene polyoxypropylene ether (suspension stabilizer) and 25.25 g of ion-exchanged water was added, and another 15 minutes passed. At that time, the rotational speed of the stirring blade (1) was reduced. The number of revolutions (n 1 ) after deceleration was 150 rpm (2.5 sec −1 ). The chip speed (V 1 ) at this time was 0.55 m / sec, and the polymerization rate was 15.6%.

さらに3時間、窒素ガス流通下に同温度、同回転数で撹拌を続け、次いで窒素ガス流通下に同回転数で85℃に昇温し、同温度、同回転数を維持して重合を完結させた。重合直後の重合混合物中で、得られたメタクリル樹脂粒子は全く凝集しておらず、その中心粒子径(D50)は8.48μmであった。結果を第1表および第2表に示す。 Continue stirring at the same temperature and rotation speed for 3 hours under nitrogen gas flow, then raise the temperature to 85 ° C at the same rotation speed under nitrogen gas flow and maintain the same temperature and rotation speed to complete the polymerization. I let you. In the polymerization mixture immediately after the polymerization, the obtained methacrylic resin particles were not aggregated at all, and the center particle diameter (D 50 ) was 8.48 μm. The results are shown in Tables 1 and 2.

実施例2
攪拌翼(1)として幅14mmの矩形状の平板を撹拌軸(11)に対して45°の取付角度(θ)で4枚ずつ2段で計8枚取り付けた、直径(d)0.06mのものを用い、初期回転数(n0)を800rpm(13.3秒-1)とし、減速後の回転数(n1)を190rpm(3.2秒-1)とした以外は実施例と同様に操作して、中心粒子径(D50)7.7μmのメタクリル樹脂粒子を得た。2.3×D/10d(=α)は0.260である。減速時の重合率は11.7%であった。重合直後の重合混合物中でメタクリル樹脂粒子は全く凝集していなかった。結果を第1表および第2表に示す。
Example 2
As a stirring blade (1), a rectangular flat plate having a width of 14 mm was attached to each of the four in four stages at a mounting angle (θ) of 45 ° with respect to the stirring shaft (11), and the diameter (d) was 0.06 m. And the initial rotational speed (n 0 ) was 800 rpm (13.3 seconds −1 ), and the rotational speed after deceleration (n 1 ) was 190 rpm (3.2 seconds −1 ). The same operation was performed to obtain methacrylic resin particles having a center particle diameter (D 50 ) of 7.7 μm. 2.3 × D / 10 d (= α) is 0.260. The polymerization rate during deceleration was 11.7%. The methacrylic resin particles were not aggregated at all in the polymerization mixture immediately after polymerization. The results are shown in Tables 1 and 2.

比較例1
減速後の回転数を250rpm(4.2秒-1)とした以外は実施例2と同様に操作して、中心粒子径(D50)10.6μmのメタクリル樹脂粒子を得た。減速時の重合率は10.6%であった。重合直後の重合混合物中でメタクリル樹脂粒子のほとんどは凝集していた。結果を第1表および第2表に示す。
Comparative Example 1
A methacrylic resin particle having a center particle diameter (D 50 ) of 10.6 μm was obtained in the same manner as in Example 2 except that the number of rotations after deceleration was 250 rpm (4.2 sec −1 ). The polymerization rate during deceleration was 10.6%. Most of the methacrylic resin particles were aggregated in the polymerization mixture immediately after polymerization. The results are shown in Tables 1 and 2.

比較例2
初期回転数(n0)を700rpm(11.7秒-1)とした以外は実施例2と同様に操作して、中心粒子径(D50)14.3μmのメタクリル樹脂粒子を得た。減速時の重合率は13.6%であった。重合直後の重合混合物中でメタクリル樹脂粒子のほとんどは凝集していた。結果を第1表および第2表に示す。
Comparative Example 2
A methacrylic resin particle having a center particle diameter (D 50 ) of 14.3 μm was obtained in the same manner as in Example 2 except that the initial rotational speed (n 0 ) was set to 700 rpm (11.7 sec −1 ). The polymerization rate during deceleration was 13.6%. Most of the methacrylic resin particles were aggregated in the polymerization mixture immediately after polymerization. The results are shown in Tables 1 and 2.

実施例3
初期回転数(n0)を750rpm(12.5秒-1)とし、減速後の回転数(n1)を110rpm(1.8秒-1)とした以外は実施例2と同様に操作して、中心粒子径(D50)11.6μmのメタクリル樹脂粒子を得た。減速時の重合率は16.7%であった。重合直後の重合混合物中でメタクリル樹脂粒子は全く凝集していなかった。結果を第1表および第2表に示す。
Example 3
The same operation as in Example 2 was performed except that the initial rotational speed (n 0 ) was set to 750 rpm (12.5 sec −1 ) and the rotational speed after deceleration (n 1 ) was set to 110 rpm (1.8 sec −1 ). Thus, methacrylic resin particles having a center particle diameter (D 50 ) of 11.6 μm were obtained. The polymerization rate during deceleration was 16.7%. The methacrylic resin particles were not aggregated at all in the polymerization mixture immediately after polymerization. The results are shown in Tables 1 and 2.

実施例4
減速後の回転数(n1)を90rpm(1.5秒-1)とした以外は実施例3と同様に操作して、中心粒子径(D50)10μmのメタクリル樹脂粒子を得た。減速時の重合率は15.9%であった。重合直後の重合混合物中でメタクリル樹脂粒子は全く凝集していなかった。結果を第1表および第2表に示す。
Example 4
A methacrylic resin particle having a center particle diameter (D 50 ) of 10 μm was obtained in the same manner as in Example 3 except that the rotation speed (n 1 ) after deceleration was 90 rpm (1.5 sec −1 ). The polymerization rate during deceleration was 15.9%. The methacrylic resin particles were not aggregated at all in the polymerization mixture immediately after polymerization. The results are shown in Tables 1 and 2.

比較例3
減速することなく初期回転数(n0)750rpmのまま重合を続けた以外は実施例3と同様に操作したところ、重合後の重合混合物中ではメタクリル樹脂粒子が激しく凝集していて、中心粒子径を測定することができなかった。結果を第1表および第2表に示す。
Comparative Example 3
When the same operation as in Example 3 was carried out except that the polymerization was continued with the initial rotational speed (n 0 ) 750 rpm without decelerating, the methacrylic resin particles were vigorously aggregated in the polymerized mixture after polymerization, and the center particle diameter Could not be measured. The results are shown in Tables 1 and 2.

比較例4
内容物の温度が65℃となった時点で、ポリオキシエチレンポリオキシプロピレンエーテル(懸濁安定剤)8.42gとイオン交換水25.25gとの混合物(溶液)を加え、さらに67分を経過した時点で撹拌翼(1)の回転数を減速した以外は実施例3と同様に操作したところ、重合後の重合混合物中ではメタクリル樹脂粒子が激しく凝集していて、中心粒子径を測定することができなかった。減速時の重合率は27.5%であった。結果を第1表および第2表に示す。
Comparative Example 4
When the temperature of the contents reached 65 ° C., a mixture (solution) of 8.42 g of polyoxyethylene polyoxypropylene ether (suspension stabilizer) and 25.25 g of ion-exchanged water was added, and another 67 minutes passed. When the operation was carried out in the same manner as in Example 3 except that the number of revolutions of the stirring blade (1) was reduced, the methacrylic resin particles aggregated vigorously in the polymerization mixture after polymerization, and the center particle diameter was measured. I could not. The polymerization rate during deceleration was 27.5%. The results are shown in Tables 1 and 2.

実施例5
減速後の回転数(n1)を50rpm(0.83秒-1)とした以外は実施例3と同様に操作して、中心粒子径(D50)9.9μmのメタクリル樹脂粒子を得た。減速時の重合率は14.9%であった。重合直後の重合混合物中でメタクリル樹脂粒子は一部が沈殿していた。結果を第1表および第2表に示す。







Example 5
A methacrylic resin particle having a center particle diameter (D 50 ) of 9.9 μm was obtained in the same manner as in Example 3 except that the rotation speed (n 1 ) after deceleration was 50 rpm (0.83 sec −1 ). . The polymerization rate during deceleration was 14.9%. Part of the methacrylic resin particles was precipitated in the polymerization mixture immediately after polymerization. The results are shown in Tables 1 and 2.







第 1 表
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
攪拌翼 重合容器 重合開始時
直径 内径 ─────────
d D α n00 α×V0
(m) (m) (秒-1) (m/秒)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
実施例1 0.07 0.13 0.254 11.4 2.51 0.638
────────────────────────────────────
実施例2 0.06 0.13 0.260 13.3 2.51 0.653
比較例1 0.06 0.13 0.260 13.3 2.51 0.653
比較例2 0.06 0.13 0.260 11.7 2.20 0.572
────────────────────────────────────
実施例3 0.06 0.13 0.260 12.5 2.36 0.614
実施例4 0.06 0.13 0.260 12.5 2.36 0.614
比較例3 0.06 0.13 0.260 12.5 2.36 0.614
比較例4 0.06 0.13 0.260 12.5 2.36 0.614
────────────────────────────────────
実施例5 0.06 0.13 0.260 12.5 2.36 0.614
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
α=2.3×D/10d〔Dは重合容器の内径(単位m)、dは攪拌翼の直径(単位m)〕
Table 1
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Stirring blade Polymerization vessel At the start of polymerization
Diameter Inner diameter ─────────
d D α n 0 V 0 α × V 0
(m) (m) (second -1 ) (m / second)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Example 1 0.07 0.13 0.254 11.4 2.51 0.638
────────────────────────────────────
Example 2 0.06 0.13 0.260 13.3 2.51 0.653
Comparative Example 1 0.06 0.13 0.260 13.3 2.51 0.653
Comparative Example 2 0.06 0.13 0.260 11.7 2.20 0.572
────────────────────────────────────
Example 3 0.06 0.13 0.260 12.5 2.36 0.614
Example 4 0.06 0.13 0.260 12.5 2.36 0.614
Comparative Example 3 0.06 0.13 0.260 12.5 2.36 0.614
Comparative Example 4 0.06 0.13 0.260 12.5 2.36 0.614
────────────────────────────────────
Example 5 0.06 0.13 0.260 12.5 2.36 0.614
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
α = 2.3 × D / 10 d [D is the inner diameter of the polymerization vessel (unit m), d is the diameter of the stirring blade (unit m)]

第 2 表
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
減速時 減速後 凝集 D50
重合率 ────────── 有無
11
(%) (秒-1) (m/秒) (μm)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
実施例1 15.6 2.5 0.55 無し 8.48
──────────────────────────────
実施例2 10.6 3.2 0.60 無し 7.70
比較例1 11.7 4.2 0.79 あり 10.6
比較例2 13.6 3.2 0.60 あり 14.3
──────────────────────────────
実施例3 16.7 3.2 0.60 無し 11.6
実施例4 15.9 1.5 0.28 無し 10.0
比較例3 − − − あり −
比較例4 27.5 3.2 0.60 あり −
──────────────────────────────
実施例5 14.9 0.83 0.16 無し 9.90
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Table 2
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
During deceleration After deceleration Aggregation D 50
Polymerization rate ────────── Existence
n 1 V 1
(%) (Sec- 1 ) (m / sec) (μm)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Example 1 15.6 2.5 0.55 None 8.48
──────────────────────────────
Example 2 10.6 3.2 0.60 None 7.70
Comparative Example 1 11.7 4.2 0.79 Yes 10.6
Comparative Example 2 13.6 3.2 0.60 Yes 14.3
──────────────────────────────
Example 3 16.7 3.2 0.60 None 11.6
Example 4 15.9 1.5 0.28 None 10.0
Comparative Example 3---Yes-
Comparative Example 4 27.5 3.2 0.60 Yes-
──────────────────────────────
Example 5 14.9 0.83 0.16 None 9.90
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

実施例2〜実施例5および比較例1〜比較例2について、重合開始時のチップ速度(V0)と減速後のチップ速度(V1)との関係を図4に示す。 FIG. 4 shows the relationship between the tip speed (V 0 ) at the start of polymerization and the tip speed (V 1 ) after deceleration for Examples 2 to 5 and Comparative Examples 1 to 2.

実施例6
重合容器(2)として、内容積10L、内径(D)0.20mで密閉式の円筒形状の容器を用いた。内部には、幅10mmで容器の内面(2a)に沿って底部(2b)から上方に至る板状のバッフル(4)を6個均等間隔で設けた。この重合容器(2)には、撹拌軸(11)に取り付けた撹拌翼(1)が備えられている。撹拌翼(1)としては、幅22mmの矩形状の平板を用い、図3に示すように撹拌軸(11)に対して70°の角度(α)で取りつけたものを用いた。撹拌翼(1)の枚数は8枚とし、4枚ずつ2段で取り付けた。攪拌翼(1)の直径(d)は0.13mであった。2.3×D/10d(=α)は0.341である。
Example 6
As the polymerization container (2), a sealed cylindrical container having an internal volume of 10 L and an inner diameter (D) of 0.20 m was used. Inside, six plate-like baffles (4) having a width of 10 mm and extending upward from the bottom (2b) along the inner surface (2a) of the container were provided at equal intervals. The polymerization vessel (2) is provided with a stirring blade (1) attached to the stirring shaft (11). As the stirring blade (1), a rectangular flat plate having a width of 22 mm was used, which was attached at an angle (α) of 70 ° with respect to the stirring shaft (11) as shown in FIG. The number of stirring blades (1) was eight, and four blades were attached in two stages. The diameter (d) of the stirring blade (1) was 0.13 m. 2.3 × D / 10 d (= α) is 0.341.

この重合容器(2)にイオン交換水5161.26g、ポリメタクリル酸ナトリウム(懸濁安定剤)1.88g、ドデシルベンゼンスルホン酸ナトリウム(懸濁安定剤)0.81g、ポリオキシエチレンポリオキシプロピレンエーテル(懸濁安定剤)21.43gおよびヒドロキシポリプロピルセルロース0.43gを投入し、溶解させた。次いでメチルメタクリレート2033g、メチルアクリレート(単官能単量体)85.7g、エチレングリコールジメタクリレート(多官能単量体)12.9g、ターピノレン(重合調整剤)0.32g、ラウロイルパーオキシド(重合開始剤)6.4gおよびベンゾイルパーオキシド2.1gを混合、溶解させた混合物を加え、内部を窒素ガス(5)で置換した後、密閉して、撹拌翼(1)を初期回転数(n0)453rpm(7.55秒-1)にて回転させて30分間撹拌した。このときのチップ速度(V0)は3.08m/秒である。 In this polymerization vessel (2), 5161.26 g of ion exchanged water, 1.88 g of sodium polymethacrylate (suspension stabilizer), 0.81 g of sodium dodecylbenzenesulfonate (suspension stabilizer), polyoxyethylene polyoxypropylene ether (Suspension stabilizer) 21.43 g and hydroxypolypropylcellulose 0.43 g were added and dissolved. Next, 2033 g of methyl methacrylate, 85.7 g of methyl acrylate (monofunctional monomer), 12.9 g of ethylene glycol dimethacrylate (polyfunctional monomer), 0.32 g of terpinolene (polymerization regulator), lauroyl peroxide (polymerization initiator) ) A mixture in which 6.4 g and 2.1 g of benzoyl peroxide were mixed and dissolved was added, the inside was replaced with nitrogen gas (5), and the mixture was sealed and the stirring blade (1) was rotated at the initial rotational speed (n 0 ) The mixture was rotated at 453 rpm (7.55 sec- 1 ) and stirred for 30 minutes. The chip speed (V 0 ) at this time is 3.08 m / sec.

その後、撹拌翼を同回転速度で回転させながら昇温し、重合を開始させた。内容物の温度が65℃となった時点で、ポリオキシエチレンポリオキシプロピレンエーテル(懸濁安定剤)42.85gとイオン交換水128.55gとの混合物(溶液)を加え、さらに15分を経過した時点で撹拌翼(1)の回転数を減速した。減速後の回転数(n1)は134rpm(2.23秒-1)とした。このときのチップ速度(V1)は0.91m/秒であった。このときの重合率は約15%である。 Then, it heated up, rotating a stirring blade at the same rotational speed, and superposition | polymerization was started. When the temperature of the contents reached 65 ° C., a mixture (solution) of 42.85 g of polyoxyethylene polyoxypropylene ether (suspension stabilizer) and 128.55 g of ion-exchanged water was added, and another 15 minutes passed. At that time, the rotational speed of the stirring blade (1) was reduced. The rotational speed (n 1 ) after deceleration was 134 rpm (2.23 sec −1 ). The chip speed (V 1 ) at this time was 0.91 m / sec. The polymerization rate at this time is about 15%.

さらに3時間、同温度、同回転数で撹拌を続け、次いで同回転数で85℃に昇温し、同温度、同回転数を維持して重合を完結させた。重合直後の重合混合物中で、得られたメタクリル樹脂粒子は全く凝集しておらず、その中心粒子径(D50)は12.7μmであった。結果を第3表および第4表に示す。 Stirring was continued for 3 hours at the same temperature and at the same rotational speed, and then the temperature was increased to 85 ° C. at the same rotational speed, and the polymerization was completed while maintaining the same temperature and the same rotational speed. In the polymerization mixture immediately after the polymerization, the obtained methacrylic resin particles were not aggregated at all, and the center particle diameter (D 50 ) was 12.7 μm. The results are shown in Tables 3 and 4.

実施例7
重合容器(2)として、内容積200L、内径(D)0.55mの円筒形状の容器を用いた。内部には、幅50mmで容器の内面(2a)に沿って底部(2b)から上方に至る板状のバッフル(4)を6個均等間隔で設けた。この重合容器(2)には、撹拌軸(11)に取り付けた撹拌翼(1)が備えられている。撹拌翼(1)としては、幅52mmの矩形状の平板を用い、図3に示すように撹拌軸(11)に対して70°の角度(α)で取りつけたものを用いた。撹拌翼(1)の枚数は16枚とし、8枚ずつ2段で取り付けた。攪拌翼(1)の直径(d)は0.25mであった。2.3×D/10d(=α)は0.711である。
Example 7
As the polymerization container (2), a cylindrical container having an internal volume of 200 L and an inner diameter (D) of 0.55 m was used. Inside, six plate-like baffles (4) having a width of 50 mm and extending upward from the bottom (2b) along the inner surface (2a) of the container were provided at equal intervals. The polymerization vessel (2) is provided with a stirring blade (1) attached to the stirring shaft (11). As the stirring blade (1), a rectangular flat plate having a width of 52 mm was used, which was attached at an angle (α) of 70 ° with respect to the stirring shaft (11) as shown in FIG. The number of stirring blades (1) was 16, and 8 blades were attached in two stages. The diameter (d) of the stirring blade (1) was 0.25 m. 2.3 × D / 10 d (= α) is 0.711.

この重合容器(2)にイオン交換水103261g、ポリメタクリル酸ナトリウム(懸濁安定剤)37.56g、ドデシルベンゼンスルホン酸ナトリウム(懸濁安定剤)16g、ポリオキシエチレンポリオキシプロピレンエーテル(懸濁安定剤)429gおよびヒドロキシポリプロピルセルロース8.58gを投入し、溶解させた。次いでメチルメタクリレート40700g、メチルアクリレート(単官能単量体)1710g、エチレングリコールジメタクリレート(多官能単量体)257g、ターピノレン(重合調整剤)6.4g、ラウロイルパーオキシド(重合開始剤)128.6gおよびベンゾイルパーオキシド42.9gを混合、溶解させた混合物を加え、内部を窒素ガス(5)で置換した後、密閉して、撹拌翼(1)を初期回転数(n0)253rpm(4.22秒-1)にて回転させて30分間撹拌した。このときのチップ速度(V0)は3.31m/秒である。 In this polymerization vessel (2), 103261 g of ion-exchanged water, 37.56 g of poly (sodium methacrylate) (suspension stabilizer), 16 g of sodium dodecylbenzenesulfonate (suspension stabilizer), polyoxyethylene polyoxypropylene ether (suspension stability) Agent) 429 g and hydroxypolypropylcellulose 8.58 g were added and dissolved. Next, 40,700 g of methyl methacrylate, 1710 g of methyl acrylate (monofunctional monomer), 257 g of ethylene glycol dimethacrylate (polyfunctional monomer), 6.4 g of terpinolene (polymerization regulator), 128.6 g of lauroyl peroxide (polymerization initiator) And 42.9 g of benzoyl peroxide were mixed and dissolved, the inside was replaced with nitrogen gas (5), and the mixture was sealed and the impeller (1) was rotated at an initial rotational speed (n 0 ) 253 rpm (4. The mixture was rotated at 22 seconds -1 ) and stirred for 30 minutes. The chip speed (V 0 ) at this time is 3.31 m / sec.

その後、窒素ガス流通下、撹拌翼を同回転速度で回転させながら昇温し、重合を開始させた。内容物の温度が65℃となった時点で、ポリオキシエチレンポリオキシプロピレンエーテル(懸濁安定剤)857.5gとイオン交換水257.25gとの混合物(溶液)を加え、さらに15分を経過した時点で撹拌翼(1)の回転数を減速した。減速後の回転数(n1)は124rpm(2.07秒-1)とした。このときのチップ速度(V1)は1.62m/秒であった。このときの重合率は約15%である。 Thereafter, under a nitrogen gas flow, the temperature was raised while rotating the stirring blade at the same rotational speed to initiate polymerization. When the temperature of the contents reached 65 ° C., a mixture (solution) of 857.5 g of polyoxyethylene polyoxypropylene ether (suspension stabilizer) and 257.25 g of ion-exchanged water was added, and another 15 minutes passed. At that time, the rotational speed of the stirring blade (1) was reduced. The number of revolutions (n 1 ) after deceleration was 124 rpm (2.07 sec −1 ). The tip speed (V 1 ) at this time was 1.62 m / sec. The polymerization rate at this time is about 15%.

さらに3時間、同温度、同回転数で撹拌を続け、次いで同回転数で85℃に昇温し、同温度同回転数を維持して重合を完結させた。重合直後の重合混合物中で、得られたメタクリル樹脂粒子は全く凝集しておらず、その中心粒子径(D50)は13.6μmであった。結果を第3表および第4表に示す。 Stirring was continued for 3 hours at the same temperature and the same number of revolutions, and then the temperature was raised to 85 ° C. at the same number of revolutions to maintain the same temperature and the same number of revolutions to complete the polymerization. In the polymerization mixture immediately after the polymerization, the obtained methacrylic resin particles were not aggregated at all, and the center particle diameter (D 50 ) was 13.6 μm. The results are shown in Tables 3 and 4.

実施例8
重合容器(2)として、内容積1000L、内径(D)1.05mの円筒形状の容器を用いた。内部には、幅110mmで容器の内面(2a)に沿って底部(2b)から上方に至る板状のバッフル(4)を6個均等間隔で設けた。この重合容器(2)には、撹拌軸(11)に取り付けた撹拌翼(1)が備えられている。撹拌翼(1)としては、幅120mmの矩形状の平板を用い、図3に示すように撹拌軸(11)に対して70°の角度(α)で取りつけたものを用いた。撹拌翼(1)の枚数は16枚とし、8枚ずつ2段で取り付けた。攪拌翼(1)の直径(d)は0.5mであった。2.3×D/10d(=α)は0.764である。
Example 8
As the polymerization vessel (2), a cylindrical vessel having an internal volume of 1000 L and an inner diameter (D) of 1.05 m was used. Inside, six plate-like baffles (4) having a width of 110 mm and extending upward from the bottom (2b) along the inner surface (2a) of the container were provided at equal intervals. The polymerization vessel (2) is provided with a stirring blade (1) attached to the stirring shaft (11). As the stirring blade (1), a rectangular flat plate having a width of 120 mm was used, which was attached at an angle (α) of 70 ° with respect to the stirring shaft (11) as shown in FIG. The number of stirring blades (1) was 16, and 8 blades were attached in two stages. The diameter (d) of the stirring blade (1) was 0.5 m. 2.3 × D / 10 d (= α) is 0.764.

この重合容器(2)にイオン交換水516098g、ポリメタクリル酸ナトリウム(懸濁安定剤)187.56g、ドデシルベンゼンスルホン酸ナトリウム(懸濁安定剤)80.4g、ポリオキシエチレンポリオキシプロピレンエーテル(懸濁安定剤)2143gおよびヒドロキシポリプロピルセルロース42.86gを投入し、溶解させた。次いでメチルメタクリレート203500g、メチルアクリレート(単官能単量体)8570g、エチレングリコールジメタクリレート(多官能単量体)1286g、ターピノレン(重合調整剤)32g、ラウロイルパーオキシド(重合開始剤)643gおよびベンゾイルパーオキシド214gを混合、溶解させた混合物を加え、、内部を窒素ガス(5)で置換した後、密閉して、撹拌翼(1)を初期回転数(n0)150rpm(2.50秒-1)にて回転させて30分間撹拌した。このときのチップ速度(V1)は3.93m/秒である。 In this polymerization vessel (2), 51,698 g of ion-exchanged water, 187.56 g of sodium polymethacrylate (suspension stabilizer), 80.4 g of sodium dodecylbenzenesulfonate (suspension stabilizer), polyoxyethylene polyoxypropylene ether (suspension) Turbidity stabilizer) 2143 g and hydroxypolypropylcellulose 42.86 g were added and dissolved. Next, 203500 g of methyl methacrylate, 8570 g of methyl acrylate (monofunctional monomer), 1286 g of ethylene glycol dimethacrylate (polyfunctional monomer), 32 g of terpinolene (polymerization regulator), 643 g of lauroyl peroxide (polymerization initiator) and benzoyl peroxide A mixture in which 214 g was mixed and dissolved was added, and the inside was replaced with nitrogen gas (5), then sealed, and the stirring blade (1) was rotated at an initial rotational speed (n 0 ) 150 rpm (2.50 sec −1 ). And stirred for 30 minutes. The chip speed (V 1 ) at this time is 3.93 m / sec.

その後、撹拌翼を同回転速度で回転させながら昇温し、重合を開始させた。内容物の温度が65℃となった時点で、ポリオキシエチレンポリオキシプロピレンエーテル(懸濁安定剤)4285gとイオン交換水12855gとの混合物(溶液)を加え、さらに15分を経過した時点で撹拌翼(1)の回転数を減速した。減速後の回転数(n1)は68rpm(1.13秒-1)とした。このときのチップ速度(V1)は1.78m/秒であった。このときの重合率は約15%である。 Then, it heated up, rotating a stirring blade at the same rotational speed, and superposition | polymerization was started. When the temperature of the contents reached 65 ° C., a mixture (solution) of 4285 g of polyoxyethylene polyoxypropylene ether (suspension stabilizer) and 12855 g of ion-exchanged water was added, and stirring was performed after 15 minutes had passed. Reduced the speed of the wing (1). The rotational speed (n 1 ) after deceleration was 68 rpm (1.13 sec −1 ). The tip speed (V 1 ) at this time was 1.78 m / sec. The polymerization rate at this time is about 15%.

さらに3時間、同温度、同回転数で撹拌を続け、次いで同回転数で85℃に昇温し、同温度同回転数を維持して重合を完結させた。重合直後の重合混合物中で、得られたメタクリル樹脂粒子は全く凝集しておらず、その中心粒子径(D50)は11.1μmであった。結果を第3表および第4表に示す。 Stirring was continued for 3 hours at the same temperature and the same number of revolutions, and then the temperature was raised to 85 ° C. at the same number of revolutions to maintain the same temperature and the same number of revolutions to complete the polymerization. In the polymerization mixture immediately after the polymerization, the obtained methacrylic resin particles were not aggregated at all, and the center particle diameter (D 50 ) was 11.1 μm. The results are shown in Tables 3 and 4.

実施例9
初期回転数(n0)を175rpm(2.92秒-1)とした以外は実施例8と同様に操作して、中心粒子径(D50)10.1μmのメタクリル樹脂粒子を得た。減速時の重合率は約15%である。重合直後の重合混合物中でメタクリル樹脂粒子の全く凝集していなかった。結果を第3表および第4表に示す。
Example 9
A methacrylic resin particle having a center particle diameter (D 50 ) of 10.1 μm was obtained in the same manner as in Example 8 except that the initial rotational speed (n 0 ) was 175 rpm (2.92 sec −1 ). The polymerization rate during deceleration is about 15%. The methacrylic resin particles were not aggregated at all in the polymerization mixture immediately after polymerization. The results are shown in Tables 3 and 4.

実施例10
初期回転数(n0)を188rpm(3.13秒-1)とした以外は実施例8と同様に操作して、中心粒子径(D50)10.1μmのメタクリル樹脂粒子を得た。減速時の重合率は約15%である。重合直後の重合混合物中でメタクリル樹脂粒子の全く凝集していなかった。結果を第3表および第4表に示す。
Example 10
A methacrylic resin particle having a center particle diameter (D 50 ) of 10.1 μm was obtained in the same manner as in Example 8 except that the initial rotational speed (n 0 ) was 188 rpm (3.13 sec −1 ). The polymerization rate during deceleration is about 15%. The methacrylic resin particles were not aggregated at all in the polymerization mixture immediately after polymerization. The results are shown in Tables 3 and 4.

第 3 表
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
攪拌翼 重合容器 重合開始時
直径 内径 ─────────
d D α n00 α×V0
(m) (m) (秒-1) (m/秒)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
実施例6 0.13 0.20 0.341 7.55 3.08 1.05
実施例7 0.25 0.55 0.711 4.22 3.31 2.36
実施例8 0.50 1.05 0.764 2.50 3.93 3.00
実施例9 0.50 1.05 0.764 2.92 4.59 3.51
実施例10 0.50 1.05 0.764 3.13 4.92 3.76
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
α=2.3×D/10d〔Dは重合容器の内径(単位m)、dは攪拌翼の直径(単位m)〕
Table 3
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Stirring blade Polymerization vessel At the start of polymerization
Diameter Inner diameter ─────────
d D α n 0 V 0 α × V 0
(m) (m) (second -1 ) (m / second)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Example 6 0.13 0.20 0.341 7.55 3.08 1.05
Example 7 0.25 0.55 0.711 4.22 3.31 2.36
Example 8 0.50 1.05 0.764 2.50 3.93 3.00
Example 9 0.50 1.05 0.764 2.92 4.59 3.51
Example 10 0.50 1.05 0.764 3.13 4.92 3.76
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
α = 2.3 × D / 10 d [D is the inner diameter of the polymerization vessel (unit m), d is the diameter of the stirring blade (unit m)]

第 4 表
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
減速時 減速後 凝集 D50
重合率 ────────── 有無
11
(%) (秒-1) (m/秒) (μm)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
実施例6 15 2.23 0.91 無し 11.1
実施例7 15 2.07 1.62 無し 13.6
実施例8 15 1.13 1.78 無し 11.1
実施例9 15 1.13 1.78 無し 10.1
実施例10 15 1.13 1.78 無し 10.1
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Table 4
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
During deceleration After deceleration Aggregation D 50
Polymerization rate ────────── Existence
n 1 V 1
(%) (Sec- 1 ) (m / sec) (μm)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Example 6 15 2.23 0.91 None 11.1
Example 7 15 2.07 1.62 None 13.6
Example 8 15 1.13 1.78 None 11.1
Example 9 15 1.13 1.78 None 10.1
Example 10 15 1.13 1.78 None 10.1
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

本発明の製造方法によるメタクリル樹脂粒子の製造に用いられる重合装置の一例の縦断面図である。It is a longitudinal cross-sectional view of an example of the superposition | polymerization apparatus used for manufacture of the methacryl resin particle by the manufacturing method of this invention. 図1のA−A’断面における横断面図である。It is a cross-sectional view in the A-A 'cross section of FIG. 攪拌軸に対する攪拌翼の取り付け角度を示す模式図である。It is a schematic diagram which shows the attachment angle of the stirring blade with respect to the stirring shaft. 実施例2〜実施例5(図中、黒丸で示す)および比較例1〜比較例2(図中、白丸で示す)について、重合開始時のチップ速度(V0)と減速後のチップ速度(V1)との関係を示す図である。For Examples 2 to 5 (indicated by black circles in the figure) and Comparative Examples 1 to 2 (indicated by white circles in the figure), the chip speed (V 0 ) at the start of polymerization and the chip speed after deceleration ( it is a diagram showing a relationship between V 1).

符号の説明Explanation of symbols

1:攪拌翼 11:撹拌軸 d:直径 θ:取付角度
2:重合容器 2a:内面 2b:底面 D:内径
3:単量体および水性媒体
4:バッフル
5:窒素ガス
1: Stirring blade 11: Stirring shaft d: Diameter θ: Mounting angle 2: Polymerization vessel 2a: Inner surface 2b: Bottom surface D: Inner diameter 3: Monomer and aqueous medium 4: Baffle 5: Nitrogen gas

Claims (1)

メチルメタクリレートを主成分とする単量体および水性媒体を重合容器内で攪拌翼により攪拌し、前記単量体を水性媒体中に懸濁させながら重合させて、メタクリル樹脂粒子を製造する方法であり、
式(1)
V = π × d × n (1)
〔式中、Vはチップ速度(単位はm/秒)を、dは攪拌翼の直径(単位はm)を、nは攪拌翼の回転数(単位は秒-1)をそれぞれ示す。〕
で示されるチップ速度(V)が2.3m/秒以上となるように攪拌しながら重合を開始させ、
次いで単量体の重合率が25%以下の間に、チップ速度(V)が式(2)
V ≦ 2.3 × D /10d × V0 (2)
〔式中、Dは重合容器の内径(単位はm)を、V0は重合を開始させたときのチップ速度(単位はm/秒)をそれぞれ示し、dは前記と同じ意味を示す。〕
を満足する攪拌条件とし、
該攪拌条件で攪拌しながら重合を完結させることを特徴とするメタクリル樹脂粒子の製造方法。
A method of producing methacrylic resin particles by stirring a monomer mainly composed of methyl methacrylate and an aqueous medium with a stirring blade in a polymerization vessel and polymerizing the monomer while suspending in the aqueous medium. ,
Formula (1)
V = π × d × n (1)
[In the formula, V represents the tip speed (unit: m / second), d represents the diameter of the stirring blade (unit: m), and n represents the rotation speed of the stirring blade (unit: second -1 ). ]
The polymerization is started while stirring so that the chip speed (V) indicated by is 2.3 m / sec or more,
Next, while the polymerization rate of the monomer is 25% or less, the chip speed (V) is the formula (2)
V ≦ 2.3 × D / 10d × V 0 (2)
[In the formula, D represents the inner diameter of the polymerization vessel (unit: m), V 0 represents the tip speed (unit: m / second) when the polymerization was started, and d represents the same meaning as described above. ]
And satisfying the stirring conditions,
A method for producing methacrylic resin particles, comprising completing polymerization while stirring under the stirring conditions.
JP2003419421A 2003-12-17 2003-12-17 Method for producing methacrylic resin particles Expired - Fee Related JP3897020B2 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007137978A (en) * 2005-11-16 2007-06-07 Toagosei Co Ltd Apparatus for producing urethane (meth)acrylate or epoxy (meth)acrylate and method for production
JP2007154051A (en) * 2005-12-06 2007-06-21 Sumitomo Chemical Co Ltd Method for producing methacrylic resin fine particle
JP2011116864A (en) * 2009-12-03 2011-06-16 Nippon Shokubai Co Ltd Method for producing fine particle
KR101334065B1 (en) 2005-12-06 2013-11-29 스미또모 가가꾸 가부시끼가이샤 Process for producing fine methacrylate resin particle
JP2019073583A (en) * 2017-10-12 2019-05-16 株式会社日本触媒 Organic fine particle and method for producing the same
JP2019073582A (en) * 2017-10-12 2019-05-16 株式会社日本触媒 Organic fine particle and method for producing the same

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007137978A (en) * 2005-11-16 2007-06-07 Toagosei Co Ltd Apparatus for producing urethane (meth)acrylate or epoxy (meth)acrylate and method for production
JP2007154051A (en) * 2005-12-06 2007-06-21 Sumitomo Chemical Co Ltd Method for producing methacrylic resin fine particle
JP4613808B2 (en) * 2005-12-06 2011-01-19 住友化学株式会社 Method for producing fine methacrylic resin particles
KR101334065B1 (en) 2005-12-06 2013-11-29 스미또모 가가꾸 가부시끼가이샤 Process for producing fine methacrylate resin particle
JP2011116864A (en) * 2009-12-03 2011-06-16 Nippon Shokubai Co Ltd Method for producing fine particle
JP2019073583A (en) * 2017-10-12 2019-05-16 株式会社日本触媒 Organic fine particle and method for producing the same
JP2019073582A (en) * 2017-10-12 2019-05-16 株式会社日本触媒 Organic fine particle and method for producing the same
JP7246849B2 (en) 2017-10-12 2023-03-28 株式会社日本触媒 Organic fine particles and method for producing the same

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