JP2002097214A - Method for producing polystyrene latex and polystyrene latex - Google Patents

Method for producing polystyrene latex and polystyrene latex

Info

Publication number
JP2002097214A
JP2002097214A JP2000289713A JP2000289713A JP2002097214A JP 2002097214 A JP2002097214 A JP 2002097214A JP 2000289713 A JP2000289713 A JP 2000289713A JP 2000289713 A JP2000289713 A JP 2000289713A JP 2002097214 A JP2002097214 A JP 2002097214A
Authority
JP
Japan
Prior art keywords
styrene
polymerization
mass
latex
polyoxyethylene
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2000289713A
Other languages
Japanese (ja)
Inventor
Toru Yoshikawa
徹 吉川
Ryoichi Yamamoto
亮一 山本
Tatsuo Ishikawa
達夫 石川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Showa Denko Materials Co Ltd
Original Assignee
Hitachi Chemical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Chemical Co Ltd filed Critical Hitachi Chemical Co Ltd
Priority to JP2000289713A priority Critical patent/JP2002097214A/en
Publication of JP2002097214A publication Critical patent/JP2002097214A/en
Pending legal-status Critical Current

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  • Polymerisation Methods In General (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a polystyrene latex whereby a large particle size averaging >0.5 μm and <3 μm is obtained by using a styrene containing a monofunctional or polyfunctional monomer capable of radical copolymerizing with the styrene and the attachment within the reaction vessel and the formation of the coagulation as a byproduct are little, and to provide the polystyrene latex. SOLUTION: The method performs the emulsion polymerization using a styrene containing the polyfunctional monomer of >=0.5 mol% and <=10 mol% with respect to the styrene and a nonionic surfactant having HLB value of >=10.0 and <=17.0 and the cloud point of the polymerization temperature or more and the temperature of +15 deg.C or less in an aqueous medium, and the polystyrene latex.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明はポリスチレン系ラテ
ックスの製造方法及びポリスチレン系ラテックスに関す
る。詳しくは大粒子径で反応容器内部や付着の凝集物の
副生が少ないポリスチレン系ラテックスの製造方法及び
ポリスチレン系ラテックスに関する。
The present invention relates to a method for producing a polystyrene latex and a polystyrene latex. More specifically, the present invention relates to a method for producing a polystyrene-based latex having a large particle diameter and having a small amount of by-products in the inside of a reaction vessel or attached thereto, and to a polystyrene-based latex.

【0002】[0002]

【従来の技術】ポリマー微粒子を得る製造法としては、
乳化重合及び懸濁重合が一般的に良く知られている。乳
化重合によって得られる粒子径は通常0.05μm〜
0.5μmであり、懸濁重合によって得られる粒子径は
通常100μm以上である。この間の0.5μm〜10
0μmの領域を埋めるべくいくつかの方法が提案されて
いる。イオン性開始剤やイオン性のコモノマを使用して
粒子を安定化し、界面活性剤を用いないソープフリー重
合は、0.1〜1μmと通常の乳化重合より大きい粒子
径が得られることが知られているが、疎水性の強いスチ
レン等のモノマを単独で使用する場合は安定であるが、
やや親水性のアクリル酸エステル等や多官能モノマを
0.5mol%以上含んだスチレンでは、反応容器内部
の付着や凝集物の副生が顕著となるため、工業的な応用
に制約があった。このほかに乳化重合で得られた粒子を
大きくする手法として、シード重合法及びUgelstadらに
よって提案された二段階膨潤重合法(特公昭57−24
369号公報)があるが、これらは操作が煩雑となり、
二段階膨潤重合法の場合は膨潤助剤を必要とするためそ
の残存或いは除去を考慮せねばならず、工業的な応用に
制約があった。このほか、有機溶媒を媒体として用いる
分散重合法(Y.Almog et.al,Br.Polym.J.,14,131(198
2))が0.1μm〜10μmの粒子径が得られる手法と
して知られているが、水に比べると引火の危険性があっ
たり、また高価な有機媒体は工業的に用いにくい問題点
がある。
2. Description of the Related Art As a production method for obtaining polymer fine particles,
Emulsion polymerization and suspension polymerization are generally well known. Particle size obtained by emulsion polymerization is usually 0.05 μm or more.
0.5 μm, and the particle diameter obtained by suspension polymerization is usually 100 μm or more. 0.5 μm to 10 during this time
Several methods have been proposed to fill the 0 μm area. It is known that soap-free polymerization using an ionic initiator or an ionic comonomer to stabilize particles and use no surfactant can obtain a particle size of 0.1 to 1 μm, which is larger than ordinary emulsion polymerization. However, when using a monomer such as strong hydrophobic styrene alone is stable,
Styrene containing a slightly hydrophilic acrylate or the like or a polyfunctional monomer in an amount of 0.5 mol% or more significantly restricts adhesion to the inside of the reaction vessel and by-products of aggregates, which limits industrial application. In addition, as a method for enlarging particles obtained by emulsion polymerization, a seed polymerization method and a two-step swelling polymerization method proposed by Ugelstad et al.
No. 369), but these operations are complicated,
In the case of the two-step swelling polymerization method, since a swelling aid is required, its residual or removal must be taken into consideration, which limits the industrial application. In addition, a dispersion polymerization method using an organic solvent as a medium (Y. Almog et.al, Br. Polym. J., 14 , 131 (198
2)) is known as a method for obtaining a particle diameter of 0.1 μm to 10 μm, but there is a risk of ignition compared to water, and there is a problem that an expensive organic medium is difficult to use industrially. .

【0003】[0003]

【発明が解決しようとする課題】本発明は、スチレンと
ラジカル共重合が可能な多官能モノマをスチレンに対し
て0.5mol%以上10mol%以下含むスチレンを
用いても大粒子径で反応容器内部の付着や凝集物の副生
が少ないポリスチレン系ラテックスの製造方法及びポリ
スチレン系ラテックスを提供するものである。
SUMMARY OF THE INVENTION The present invention is intended to provide a reaction vessel having a large particle diameter even if styrene containing a polyfunctional monomer capable of radical copolymerization with styrene in an amount of 0.5 mol% to 10 mol% relative to styrene is used. It is intended to provide a method for producing a polystyrene-based latex and a polystyrene-based latex, in which the adhesion of water and the generation of aggregates are small.

【0004】[0004]

【課題を解決するための手段】本発明は、(1)スチレ
ンとラジカル共重合が可能な多官能モノマをスチレンに
対して0.5mol%以上10mol%以下含むスチレ
ンを用い、HLB値が10.0以上17.0以下であり
曇点が重合温度以上で重合温度+15℃以下の非イオン
性界面活性剤を用いて水性媒体中で乳化重合するポリス
チレン系ラテックスの製造方法に関する。また、本発明
は(2)前記のポリスチレン系ラテックスの製造方法に
おいて、非イオン性界面活性剤としてポリオキシエチレ
ンアルキルエーテルを用いるポリスチレン系ラテックス
の製造方法に関する。また、本発明は(3)前記のスチ
レンとラジカル共重合が可能な多官能モノマがアクリル
酸エステル又はメタクリル酸エステルであるポリスチレ
ン系ラテックスの製造方法に関する。また、本発明は
(4)前記のポリスチレン系ラテックスの製造方法にお
いて、重合開始剤として過硫酸塩をスチレンに対して1
質量%以上10質量%以下配合するポリスチレン系ラテ
ックスの製造方法に関する。また、本発明は(5)
(1)〜(4)のいずれかのポリスチレン系ラテックス
の製造方法を用いて製造した平均粒子径が0.5μmを
超え3μm未満のポリスチレン系ラテックスに関する。
According to the present invention, (1) styrene containing a polyfunctional monomer capable of radical copolymerization with styrene in an amount of 0.5 mol% or more and 10 mol% or less based on styrene, and having an HLB value of 10. The present invention relates to a method for producing a polystyrene-based latex which is emulsion-polymerized in an aqueous medium using a nonionic surfactant having a cloud point of 0 to 17.0 and a cloud point of a polymerization temperature or higher and a polymerization temperature of + 15 ° C. or lower. The present invention also relates to (2) a method for producing a polystyrene-based latex using polyoxyethylene alkyl ether as a nonionic surfactant in the method for producing a polystyrene-based latex described above. The present invention also relates to (3) a method for producing a polystyrene-based latex in which the polyfunctional monomer capable of undergoing radical copolymerization with styrene is an acrylate or a methacrylate. The present invention also provides (4) the method for producing a polystyrene-based latex described above, wherein a persulfate is added as a polymerization initiator to styrene.
The present invention relates to a method for producing a polystyrene latex blended in an amount of from 10% by mass to 10% by mass. Further, the present invention provides (5)
The present invention relates to a polystyrene-based latex having an average particle diameter of more than 0.5 μm and less than 3 μm produced by using the method for producing a polystyrene-based latex according to any one of (1) to (4).

【0005】[0005]

【発明の実施の形態】本発明のポリスチレン系ラテック
スの製造方法は、スチレンとラジカル共重合が可能な多
官能モノマをスチレンに対して0.5mol%以上10
mol%以下含むスチレンを用い、HLB値が10.0
以上17.0以下であり曇点が重合温度以上で重合温度
+15℃以下の非イオン性界面活性剤を用いて水性媒体
中で乳化重合する製造方法である。本発明の製造方法に
より平均粒子径が0.5μmを超え3μm未満のポリス
チレン系ラテックスが得られる。
BEST MODE FOR CARRYING OUT THE INVENTION The method for producing a polystyrene-based latex according to the present invention is characterized in that a polyfunctional monomer capable of being radically copolymerized with styrene is used in an amount of 0.5 mol% or more based on styrene.
mol% or less, and HLB value of 10.0
This is a production method in which emulsion polymerization is carried out in an aqueous medium using a nonionic surfactant having a cloud point of not lower than 17.0 and a polymerization temperature of not lower than the polymerization temperature and not higher than the polymerization temperature of + 15 ° C. According to the production method of the present invention, a polystyrene-based latex having an average particle diameter of more than 0.5 μm and less than 3 μm can be obtained.

【0006】本発明におけるスチレンとラジカル共重合
が可能な多官能モノマの配合量はスチレンに対して0.
5mol%以上10mol%以下とする。好ましくは
0.5mol%以上8mol%以下とされ、より好まし
くは0.5mol%以上6mol%以下とされる。0.
5mol%未満では通常のソープフリー重合で反応容器
内部の付着や凝集物の副生も少なく合成できるので、従
来技術に比較して本発明の効果が得られにくく、10m
ol%を超えると反応容器内部の付着や凝集物の副生が
多くなる。
In the present invention, the amount of the polyfunctional monomer capable of undergoing radical copolymerization with styrene is 0.1 to styrene.
5 mol% or more and 10 mol% or less. Preferably it is 0.5 mol% or more and 8 mol% or less, more preferably 0.5 mol% or more and 6 mol% or less. 0.
If the amount is less than 5 mol%, it is difficult to obtain the effects of the present invention compared to the prior art because it can be synthesized by ordinary soap-free polymerization with little adhesion inside the reaction vessel and by-products of aggregates.
When the amount exceeds ol%, adhesion inside the reaction vessel and by-products of aggregates increase.

【0007】本発明における非イオン性界面活性剤はH
LB値が10.0以上17.0以下とされる。好ましく
は11.0以上16.0以下、更に好ましくは12.0
以上15.0以下とされる。HLB値が10.0未満で
は、非イオン性界面活性剤が溶解しにくくなったり、W
/O型の乳化になりやすくなる傾向がある。HLB値が
17.0を超えると、反応容器内部の付着や凝集物の副
生が多くなる。HLB値(米アトラスパウダー社)は次
式によって求められる値である。エチレンオキサイド系
非イオン性界面活性剤では HLB値=E/5(E=ポリオキシエチレン部分の重量
分率) 多価アルコール系非イオン性界面活性剤では HLB値=20(1−(S/A)) (S=多価アルコールエステルの鹸化価 A=脂肪酸の
中和価(酸価))
The nonionic surfactant in the present invention is H
The LB value is set to 10.0 or more and 17.0 or less. Preferably it is 11.0 or more and 16.0 or less, more preferably 12.0 or more.
It is set to 15.0 or less. If the HLB value is less than 10.0, the nonionic surfactant becomes difficult to dissolve,
There is a tendency for / O type emulsification to occur easily. If the HLB value exceeds 17.0, the adhesion inside the reaction vessel and the by-product of aggregates increase. The HLB value (Atlas Powder Co., USA) is a value obtained by the following equation. HLB value = E / 5 (E = weight fraction of polyoxyethylene portion) for ethylene oxide-based nonionic surfactant HLB value = 20 (1- (S / A) for polyhydric alcohol-based nonionic surfactant )) (S = Saponification value of polyhydric alcohol ester A = Neutralization value of fatty acid (acid value))

【0008】本発明における非イオン性界面活性剤の曇
点は重合温度以上で重合温度+15℃以下とされる。曇
点が重合温度未満では、反応容器内部の付着や凝集物の
副生が多くなり、重合温度+15℃を超えると粒子径が
小さくなる。曇点は、非イオン性界面活性剤の水溶液を
加熱して、徐々に温度を上げていき、ある温度までくる
と急に析出し、水溶液が白濁するがこの曇り始める温度
とされる。
[0008] The cloud point of the nonionic surfactant in the present invention is higher than the polymerization temperature and lower than the polymerization temperature + 15 ° C. When the cloud point is lower than the polymerization temperature, adhesion inside the reaction vessel and by-products of aggregates increase, and when the cloud point exceeds the polymerization temperature + 15 ° C., the particle size decreases. The cloud point is a temperature at which an aqueous solution of a nonionic surfactant is heated to gradually increase the temperature. When the temperature reaches a certain temperature, the solution rapidly precipitates, and the aqueous solution becomes cloudy, but the clouding point is set to a temperature at which the cloudiness starts.

【0009】本発明における非イオン性界面活性剤とし
て用いることのできる化合物を具体的に例示すると、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オレイルエーテル等のポリオ
キシエチレンアルキルエーテル、ポリオキシエチレンノ
ニルフェニルエーテル、ポリオキシエチレンオクチルフ
ェニルエーテル、ポリオキシエチレンドデシルフェニル
エーテル等のポリオキシエチレンアルキルアリルエーテ
ル、ポリオキシエチレンソルビタンモノラウレート、ポ
リオキシエチレンソルビタンモノパルミテート、ポリオ
キシエチレンソルビタンモノステアレート、ポリオキシ
エチレンソルビタントリステアレート、ポリオキシエチ
レンソルビタントリオレエート、ポリオキシエチレンソ
ルビタンモノオレエレート等のポリオキシエチレンソル
ビタン脂肪酸エステル、モノラウリン酸ポリオキシエチ
レンソルビット、テトラステアリン酸ポリオキシエチレ
ンソルビット、テトラオレイン酸ポリオキシエチレンソ
ルビット等のポリオキシエチレンソルビット脂肪酸エス
テル、ポリオキシエチレン硬化ひまし油等のポリオキシ
エチレン脂肪酸エステル、モノステアリン酸ポリオキシ
エチレングリセリル、モノオレイン酸ポリオキシエチレ
ングリセリル等のポリオキシエチレングリセリン脂肪酸
エステル、モノラウリン酸ヘキサグリセリル、モノミリ
スチン酸ヘキサグリセリル、モノラウリン酸デカグリセ
リル、モノミリスチン酸デカグリセリル、モノステアリ
ン酸デカグリセリル、モノオレイン酸デカグリセリル、
モノオレイン酸デカグリセリル、モノリノール酸デカグ
リセリル、モノイソステアリン酸デカグリセリル等のポ
リグリセリン脂肪酸エステル、ポリオキシエチレンフィ
トステロール等のポリオキシエチレンステロール、ポリ
オキシエチレンフィトスタノール、ポリオキシエチレン
コレスタノール等のポリオキシエチレン水素添加ステロ
ール、ポリオキシエチレンポリオキシプロピレンセチル
エーテル、ポリオキシエチレンポリオキシプロピレンデ
シルテトラデシルエーテル等のポリオキシエチレンポリ
オキシプロピレンアルキルエーテル、ポリオキシエチレ
ンラノリン、ポリオキシエチレンラノリンアルコール、
ポリオキシエチレンラノリンアルコールエーテル、ポリ
オキシエチレンラノリン脂肪酸エステル等が挙げられ
る。これらのうち好ましいのは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
レンオレイルエーテル等のポリオキシエチレンアルキル
エーテルである。特に好ましいのはポリオキシエチレン
ラウリルエーテルである。
Specific examples of the compound which can be used as the nonionic surfactant in the present invention include polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether and the like. Polyoxyethylene alkyl allyl ethers such as polyoxyethylene alkyl ether, polyoxyethylene nonyl phenyl ether, polyoxyethylene octyl phenyl ether, polyoxyethylene dodecyl phenyl ether, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate , Polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan tristearate, polyoxyethylene sorbitan Oleate, polyoxyethylene sorbitan fatty acid esters such as polyoxyethylene sorbitan monooleate, polyoxyethylene sorbite monolaurate, polyoxyethylene sorbite tetrastearate, polyoxyethylene sorbite fatty acid esters such as polyoxyethylene sorbite tetraoleate, Polyoxyethylene fatty acid ester such as polyoxyethylene hardened castor oil, polyoxyethylene glyceryl monostearate, polyoxyethylene glycerin fatty acid ester such as polyoxyethylene glyceryl monooleate, hexaglyceryl monolaurate, hexaglyceryl monomyristate, monolauric acid Decaglyceryl, decaglyceryl monomyristate, decaglyceryl monostearate, monoolein Decaglyceryl,
Polyglycerin fatty acid esters such as decaglyceryl monooleate, decaglyceryl monolinoleate and decaglyceryl monoisostearate; polyoxyethylene sterols such as polyoxyethylene phytosterol; polyoxyethylene sterols such as polyoxyethylene phytostanol and polyoxyethylene cholestanol. Ethylene hydrogenated sterol, polyoxyethylene polyoxypropylene cetyl ether, polyoxyethylene polyoxypropylene alkyl ether such as polyoxyethylene polyoxypropylene decyl tetradecyl ether, polyoxyethylene lanolin, polyoxyethylene lanolin alcohol,
Examples thereof include polyoxyethylene lanolin alcohol ether and polyoxyethylene lanolin fatty acid ester. Of these, preferred are polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether and polyoxyethylene oleyl ether. Particularly preferred is polyoxyethylene lauryl ether.

【0010】本発明における非イオン性界面活性剤の配
合量はスチレンに対して好ましくは1質量%以上10質
量%以下とされる。より好ましくは2質量%以上8質量
%とされ、更に好ましくは3質量%以上6質量%以下と
される。1質量%未満では反応容器内部の付着や凝集物
の副生が多くなる傾向がある。10質量%を超えると重
合が阻害される傾向がある。
The amount of the nonionic surfactant used in the present invention is preferably from 1% by weight to 10% by weight based on styrene. More preferably, the content is 2% by mass or more and 8% by mass, and still more preferably 3% by mass or more and 6% by mass or less. If the amount is less than 1% by mass, the adhesion inside the reaction vessel and the by-product of aggregates tend to increase. If it exceeds 10% by mass, the polymerization tends to be inhibited.

【0011】本発明におけるスチレンとラジカル共重合
が可能な多官能モノマとはスチレンとラジカル共重合が
可能な官能基を分子内に2個以上有するモノマをさす。
本発明におけるスチレンとラジカル共重合が可能な多官
能モノマを例示すると、ジビニルベンゼン、アリルメタ
クリレート、アリルアクリレート、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、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、トリメチロールプロパント
リメタクリレート、1,6−ヘキサンジオールジメタク
リレート、ジシクロペンタジエニルメタクリレート、ト
リメチロールプロパントリアクリレート、1,6−ヘキ
サンジオールジアクリレート、ジシクロペンタジエニル
アクリレート、ジアリルフタレート、トリアリルイソシ
アヌレート、トリアリルシアヌレート等が挙げられる。
これらの中で、好ましいものは、アリル(メタ)アクリ
レート、エチレングリコールジ(メタ)アクリレート、
ジエチレングリコール(メタ)アクリレート、トリメチ
ロールプロパントリ(メタ)アクリレート、1,6−ヘ
キサンジオールジ(メタ)アクリレート等のアクリル酸
エステル又はメタクリル酸エステルである。特に好まし
いものは、1,6−ヘキサンジオールジアクリレートで
ある。
The polyfunctional monomer capable of radical copolymerization with styrene in the present invention refers to a monomer having two or more functional groups capable of radical copolymerization with styrene in a molecule.
Examples of the polyfunctional monomer capable of radical copolymerization with styrene in the present invention include divinylbenzene, allyl methacrylate, allyl acrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, ethylene glycol diacrylate, diethylene glycol diacrylate, and trimethylolpropane trimethacrylate. 1,6-hexanediol dimethacrylate, dicyclopentadienyl methacrylate, trimethylolpropane triacrylate, 1,6-hexanediol diacrylate, dicyclopentadienyl acrylate, diallyl phthalate, triallyl isocyanurate, triallylcia Nurate and the like.
Of these, preferred are allyl (meth) acrylate, ethylene glycol di (meth) acrylate,
An acrylate or methacrylate such as diethylene glycol (meth) acrylate, trimethylolpropane tri (meth) acrylate, or 1,6-hexanediol di (meth) acrylate. Particularly preferred is 1,6-hexanediol diacrylate.

【0012】本発明における乳化重合に用いる重合開始
剤としては過硫酸塩が好ましい。具体的には過硫酸アン
モニウム、過硫酸カリウム及び過硫酸ナトリウムが好適
に用いられる。
The polymerization initiator used in the emulsion polymerization of the present invention is preferably a persulfate. Specifically, ammonium persulfate, potassium persulfate and sodium persulfate are preferably used.

【0013】本発明における過硫酸塩の配合量はスチレ
ンに対して1質量%以上10質量%以下とするのが好ま
しい。より好ましくは2質量%以上8質量%以下とさ
れ、更に好ましくは3質量%以上6質量%とされる。1
質量%未満では反応容器内部の付着や凝集物の副生が多
くなる傾向があり、10質量%を超えると反応時の発熱
が激しく重合をコントロールしにくくなる傾向がある。
The amount of the persulfate in the present invention is preferably from 1% by weight to 10% by weight based on styrene. The content is more preferably 2% by mass or more and 8% by mass or less, and still more preferably 3% by mass or more and 6% by mass. 1
When the amount is less than 10% by mass, adhesion inside the reaction vessel and by-products of aggregates tend to increase, and when the amount exceeds 10% by mass, heat generation at the time of reaction becomes so severe that it becomes difficult to control the polymerization.

【0014】本発明における乳化重合の温度は、温度7
5℃以上95℃以下とするのが好ましい。より好ましい
温度は80℃以上90℃以下であり、さらに好ましい温
度は82℃以上88℃以下てある。75℃未満では反応
容器内部の付着や凝集物の副生が多くなる傾向があり、
95℃を超えると発熱により温度制御が難しくなる傾向
がある。
The temperature of the emulsion polymerization in the present invention is 7
It is preferable that the temperature be 5 ° C or more and 95 ° C or less. A more preferred temperature is from 80 ° C to 90 ° C, and a still more preferred temperature is from 82 ° C to 88 ° C. If the temperature is lower than 75 ° C., there is a tendency that adhesion inside the reaction vessel and by-products of aggregates increase,
If the temperature exceeds 95 ° C., temperature control tends to be difficult due to heat generation.

【0015】本発明の製造方法によって得られるポリス
チレン系ラテックスの平均粒子径は0.5μmを超え3
μm未満である。好ましくは0.5μmを超え2μm未
満でありより好ましくは0.5μmを超え1.5μm未
満である。0.5μm以下では公知の乳化重合方法で反
応容器内部の付着や凝集物の副生も少なく合成でき、3
μm以上ではラテックス中の粒子が沈降して凝集しやす
くなる。
The average particle size of the polystyrene latex obtained by the production method of the present invention is more than 0.5 μm and
It is less than μm. Preferably it is more than 0.5 μm and less than 2 μm, more preferably more than 0.5 μm and less than 1.5 μm. When the particle size is 0.5 μm or less, it can be synthesized by a known emulsion polymerization method with little adhesion inside the reaction vessel and by-products of aggregates.
If it is more than μm, the particles in the latex will settle and tend to aggregate.

【0016】[0016]

【実施例】以下、実施例により本発明を説明する。The present invention will be described below with reference to examples.

【0017】実施例又は比較例における測定は以下の機
器又は方法を用いて行った。重合率:サンプリングした
重合反応液中の不揮発分を赤外線水分計を用いて測定
し、この値と仕込み割合とから次の数1を用いて決定し
た。
The measurements in Examples and Comparative Examples were performed using the following instruments or methods. Polymerization rate: The nonvolatile content in the sampled polymerization reaction solution was measured using an infrared moisture meter, and was determined from this value and the charging ratio using the following equation (1).

【数1】 重合率=((α×β÷100−γ)/δ)×100% ただし、式中の記号は次の意味である。 α:配合成分の全重量 β:採取した反応混合物中の不揮発分量(質量%) γ:配合した不揮発性試薬(界面活性剤、無機重合開始
剤等)の合計重量 δ:単量体混合物の合計重量 α、γ、δは第1段階からの累計量。
## EQU00001 ## Polymerization ratio = ((. Alpha..times..apprxeq.100-.gamma.) /. Delta.). Times.100% where the symbols in the formula have the following meanings. α: Total weight of the blended components β: Non-volatile content (mass%) in the collected reaction mixture γ: Total weight of the blended nonvolatile reagents (surfactant, inorganic polymerization initiator, etc.) δ: Total of monomer mixture Weights α, γ, δ are cumulative from the first stage.

【0018】平均粒子径:ラテックスの平均粒子径はレ
ーザ散乱法を用いて測定した。用いた機器はLEEDS
&NORTHRUP社製Microtrac(UPA)
型であった。 付着物:撹拌羽、温度センサ、フラスコ内壁に付着した
ポリマを剃刀ではがしとり、60メッシュの金網上で軽
く水洗してラテックスを除き、80℃の乾燥機で1晩乾
燥後、質量を測定し、配合モノマ総量に対する質量%を
求めた。 凝集物:60メッシュの金網でラテックスをろ過し、金
網上に残ったポリマを軽く水洗してラテックスを除き、
80℃の乾燥機で1晩乾燥後、質量を測定し、配合モノ
マ総量に対する質量%を求めた。
Average particle size: The average particle size of the latex was measured using a laser scattering method. The equipment used was LEEDS
& NORTHRUP Microtrac (UPA)
It was a mold. Deposits: stirrer, temperature sensor, polymer adhering to the inner wall of flask were removed with a razor, lightly washed on a 60-mesh wire net to remove latex, dried overnight at 80 ° C drier and weighed. % By mass based on the total amount of the blended monomers. Agglomerate: latex is filtered through a 60-mesh wire mesh, and the polymer remaining on the wire mesh is lightly washed with water to remove the latex.
After drying overnight in a dryer at 80 ° C., the mass was measured, and the mass% based on the total amount of the blended monomers was determined.

【0019】用いた化合物の略称を以下に示した。 St:スチレン、HDA:1,6−ヘキサンジオールジ
アクリレート、DVB:ジビニルベンゼン、AMA:ア
リルメタクリレート、KPS:過硫酸カリウム、AP
S:過硫酸アンモニウム
Abbreviations of the compounds used are shown below. St: styrene, HDA: 1,6-hexanediol diacrylate, DVB: divinylbenzene, AMA: allyl methacrylate, KPS: potassium persulfate, AP
S: Ammonium persulfate

【0020】実施例1 4リットルの環流冷却器付きフラスコに、蒸留水133
1g、非イオン性界面活性剤エレミノールNL−100
(三洋化成製ポリオキシエチレンアルキルエーテル、H
LB値=14.0、曇点=90℃)5.3g(=Stに
対して3.2質量%)を採取し、320rpmの回転数
で撹拌しなから窒素ガスを水中に吹き込み、約1時間か
けて、水中に溶解している酸素を置換した。ついで、窒
素ガス気流下に85℃に昇温し、St165.4gにH
DA11.6g(=Stに対して3.2mol%)、及
びAMA0.11g(=Stに対して0.2mol%)
を溶解した溶液を加えた。スチレンとラジカル共重合が
可能な多官能モノマの比率はスチレンに対して合計3.
4mol%であった。ついでKPS6.15g(=St
に対して3.7質量%)を水170gに溶かした水溶液
を加え、同温度で1.5時間保持して乳化重合を行っ
た。この時点で重合率は100%となり重合はほぼ停止
した。この時点でラテックスの1部(約8ml)を取り
出し、平均粒子径を調べたところ、0.91μmと乳化
重合としては大粒子径であった。また、付着物は0.5
質量%、凝集物は0.6質量%といずれも微量であっ
た。
Example 1 A distilled water 133 was placed in a 4 liter flask equipped with a reflux condenser.
1 g, nonionic surfactant Eleminol NL-100
(Sanyo Chemical's polyoxyethylene alkyl ether, H
An LB value of 14.0, a cloud point of 90 ° C.) was collected in an amount of 5.3 g (= 3.2% by mass with respect to St), and nitrogen gas was blown into water while stirring at a rotation speed of 320 rpm. Over time, oxygen dissolved in the water was replaced. Then, the temperature was increased to 85 ° C. under a nitrogen gas stream, and H was added to St.
DA 11.6 g (= 3.2 mol% based on St) and AMA 0.11 g (= 0.2 mol% based on St)
Was added. The ratio of polyfunctional monomers capable of radical copolymerization with styrene is 3.
It was 4 mol%. Then 6.15 g of KPS (= St
(3.7% by mass with respect to 3.7 g) was added to 170 g of water, and emulsion polymerization was carried out at the same temperature for 1.5 hours. At this time, the polymerization rate became 100%, and the polymerization almost stopped. At this time, one part (about 8 ml) of the latex was taken out, and the average particle diameter was examined. As a result, it was 0.91 μm, which was a large particle diameter for emulsion polymerization. In addition, the deposit is 0.5
Both the mass% and the aggregate were 0.6 mass%, which were very small.

【0021】実施例2 非イオン性界面活性剤をエレミノールEM−140(三
洋化成製ポリオキシエチレンアルキルエーテル、HLB
値=14.2、曇点=91℃)2.7g(=Stに対し
て1.6質量%)とした以外は実施例1と同様に乳化重
合を行った。重合率は97%となり重合はほぼ停止し
た。この時点でラテックスの1部(約8ml)を取り出
し、平均粒子径を調べたところ、0.64μmと乳化重
合としては大粒径であった。また、付着物は0.1質量
%、凝集物は2.5質量%といずれも微量であった。
Example 2 A nonionic surfactant was used as Eleminol EM-140 (polyoxyethylene alkyl ether, HLB, manufactured by Sanyo Chemical Industries, Ltd.).
Emulsion polymerization was carried out in the same manner as in Example 1 except that 2.7 g (= 1.6% by mass with respect to St) was used (value = 14.2, cloud point = 91 ° C.). The polymerization rate was 97%, and the polymerization was almost stopped. At this time, one part (about 8 ml) of the latex was taken out, and the average particle size was examined. As a result, it was 0.64 μm, which was a large particle size for emulsion polymerization. In addition, the amount of attached matter was 0.1% by mass, and the amount of aggregate was 2.5% by mass, both of which were trace amounts.

【0022】実施例3 非イオン性界面活性剤をエレミノールNL−110(三
洋化成製ポリオキシエチレンアルキルエーテル、HLB
値=14.4、曇点=98℃)5.3g(=Stに対し
て3.2質量%)とした以外は実施例1及び2と同様に
乳化重合を行った。重合率は100%となり重合はほぼ
停止した。この時点でラテックスの1部(約8ml)を
取り出し、平均粒子径を調べたところ、0.76μmと
乳化重合としては大粒径であった。また、付着物は0.
1質量%、凝集物は0.2質量%といずれも微量であっ
た。
Example 3 A nonionic surfactant was used as Eleminol NL-110 (polyoxyethylene alkyl ether, HLB, manufactured by Sanyo Chemical Industries, Ltd.).
Emulsion polymerization was carried out in the same manner as in Examples 1 and 2, except that the value was 5.3 g (= 3.2% by mass based on St) (value = 14.4, cloud point = 98 ° C.). The polymerization rate became 100%, and the polymerization almost stopped. At this time, one part (about 8 ml) of the latex was taken out, and the average particle size was examined. As a result, the particle size was 0.76 μm, which was a large particle size for emulsion polymerization. In addition, the amount of adhering substance is 0.
1% by mass and 0.2% by mass of aggregates were all trace amounts.

【0023】実施例4 St165.4gに溶解するモノマをDVB9.5g
(=Stに対して2.5mol%)、及びAMA0.1
1g(=Stに対して0.2mol%)とした以外は実
施例1と同様に乳化重合を行った。スチレンとラジカル
共重合が可能な単官能又は多官能モノマの比率はスチレ
ンに対して合計2.7mol%であった。重合率は99
%となり重合はほぼ停止した。この時点でラテックスの
1部(約8ml)を取り出し、平均粒子径を調べたとこ
ろ、0.74μmと乳化重合としては大粒子径であっ
た。また、付着物は0.2質量%、凝集物は1.0質量
%といずれも微量であった。
Example 4 A monomer dissolved in 165.4 g of St was converted into 9.5 g of DVB.
(= 2.5 mol% based on St), and AMA 0.1
Emulsion polymerization was carried out in the same manner as in Example 1 except that 1 g (= 0.2 mol% based on St) was used. The ratio of monofunctional or polyfunctional monomers capable of radical copolymerization with styrene was 2.7 mol% in total with respect to styrene. The polymerization rate is 99
%, And the polymerization almost stopped. At this time, one part (about 8 ml) of the latex was taken out, and the average particle diameter was examined. The average particle diameter was 0.74 μm, which was a large particle diameter for emulsion polymerization. Further, the amount of attached matter was 0.2% by mass, and the amount of aggregate was 1.0% by mass, all of which were trace amounts.

【0024】実施例5 KPSの代わりにAPSを用いた以外は実施例1と同様
に乳化重合を行った。重合率は100%となり重合はほ
ぼ停止した。この時点でラテックスの1部(約8ml)
を取り出し、平均粒子径を調べたところ、0.78μm
と乳化重合としては大粒子径であった。また、付着物は
0.3質量%、凝集物は0.3質量%といずれも微量で
あった。
Example 5 Emulsion polymerization was carried out in the same manner as in Example 1 except that APS was used instead of KPS. The polymerization rate became 100%, and the polymerization almost stopped. At this point, one part of latex (about 8 ml)
Was taken out, and the average particle diameter was examined.
And the emulsion polymerization had a large particle size. Further, the amount of the attached matter was 0.3% by mass and the amount of the aggregate was 0.3% by mass, and both were trace amounts.

【0025】比較例1 非イオン性界面活性剤をナロアクティN−400(三洋
化成製、高級アルコールのアルキレンオキシド付加物、
HLB値=17.8、曇点>100℃)5.3g(=S
tに対して3.2質量%)とした以外は実施例1、2及
び3と同様に乳化重合を行った。重合率は93%となり
重合はほぼ停止した。この時点でラテックスの1部(約
8ml)を取り出し、平均粒子径を調べたところ、0.
60μmと乳化重合としては大粒子径であった。また、
付着物は4.7質量%、凝集物は47.4質量%といず
れも多量であった。
COMPARATIVE EXAMPLE 1 Nonionic surfactant was used as NAROACTI N-400 (manufactured by Sanyo Chemical Industries, an alkylene oxide adduct of a higher alcohol,
5.3 g (= S) of HLB value = 17.8, cloud point> 100 ° C.)
emulsion polymerization was carried out in the same manner as in Examples 1, 2 and 3, except that the amount was 3.2% by mass with respect to t). The polymerization rate was 93%, and the polymerization was almost stopped. At this time, one part (about 8 ml) of the latex was taken out, and the average particle diameter was measured.
The emulsion polymerization had a large particle diameter of 60 μm. Also,
The attached matter was 4.7 mass%, and the aggregate was 47.4 mass%, all of which were large.

【0026】比較例2 非イオン性界面活性剤の配合量を配合しなかった以外は
実施例1と同様の方法でソープフリー重合を行った。重
合率は90%となり重合はほぼ停止した。この時点でラ
テックスの1部(約8ml)を取り出し、平均粒子径を
調べたところ、0.51μmと通常の乳化重合よりは大
粒子径であったが、ソープフリー重合としては一般的な
粒子径であった。付着物は7.5質量%、凝集物は9.
6質量%といずれも多量であった。
Comparative Example 2 Soap-free polymerization was carried out in the same manner as in Example 1 except that the amount of the nonionic surfactant was not compounded. The polymerization rate became 90%, and the polymerization was almost stopped. At this time, one part (about 8 ml) of the latex was taken out, and the average particle diameter was examined. The average particle diameter was 0.51 μm, which was larger than that of ordinary emulsion polymerization. Met. The deposit is 7.5% by mass, and the aggregate is 9.
All were as large as 6% by mass.

【0027】比較例3 重合温度を70℃とし、同温度の保持時間を4時間とし
た以外は実施例1と同様の方法で乳化重合を行った。重
合率は90%となり重合はほぼ停止した。この時点でラ
テックスの1部(約8ml)を取り出し、平均粒子径を
調べたところ、0.55μmと乳化重合としては大粒子
径であった。しかし付着物は12.5質量%、凝集物は
20.4質量%といずれも多量であった。
Comparative Example 3 Emulsion polymerization was carried out in the same manner as in Example 1 except that the polymerization temperature was 70 ° C. and the holding time at the same temperature was 4 hours. The polymerization rate became 90%, and the polymerization was almost stopped. At this time, one part (about 8 ml) of the latex was taken out, and the average particle diameter was examined. As a result, it was 0.55 μm, which was a large particle diameter for emulsion polymerization. However, the amount of attached matter was 12.5% by mass, and the amount of aggregate was 20.4% by mass.

【0028】前記した実施例1〜5における非イオン性
界面活性剤のHLB値、曇点、配合量、重合温度、スチ
レンとラジカル重合可能な単官能又は多官能モノマの配
合量、過硫酸塩の配合量、平均粒子径、付着物、凝集物
を以下の表1に示した。前記した比較例1〜3における
同様の項目を表2に示した。
The HLB value, cloud point, compounding amount, polymerization temperature, the amount of monofunctional or polyfunctional monomer capable of radical polymerization with styrene, the amount of persulfate of the nonionic surfactant in Examples 1 to 5 described above. The blending amount, average particle diameter, attached matter, and aggregates are shown in Table 1 below. Table 2 shows similar items in Comparative Examples 1 to 3 described above.

【0029】[0029]

【表1】 [Table 1]

【0030】[0030]

【表2】 [Table 2]

【0031】[0031]

【発明の効果】本発明の製造方法により平均粒子径が
0.5μmを超え3μm未満の大粒子径で反応容器内部
の付着や凝集物の副生が少なくポリスチレン系ラテック
スが得られる。
According to the production method of the present invention, a polystyrene-based latex can be obtained with a large particle diameter having an average particle diameter of more than 0.5 μm and less than 3 μm with little adhesion inside the reaction vessel and by-products of aggregates.

───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 4J011 KA15 KB14 KB22 KB29 4J100 AB02P AL02Q CA04 EA07 EA09 FA02 FA03 FA20  ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4J011 KA15 KB14 KB22 KB29 4J100 AB02P AL02Q CA04 EA07 EA09 FA02 FA03 FA20

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 スチレンとラジカル共重合が可能な多官
能モノマをスチレンに対して0.5mol%以上10m
ol%以下含むスチレンを用い、HLB値が10.0以
上17.0以下であり曇点が重合温度以上で重合温度+
15℃以下の非イオン性界面活性剤を用いて水性媒体中
で乳化重合することを特徴とするポリスチレン系ラテッ
クスの製造方法。
1. A polyfunctional monomer capable of undergoing radical copolymerization with styrene is used in an amount of 0.5 mol% or more and 10 m or more based on styrene.
% of styrene, the HLB value is 10.0 or more and 17.0 or less, the cloud point is higher than the polymerization temperature, and the polymerization temperature +
A method for producing a polystyrene-based latex, comprising emulsion polymerization in an aqueous medium using a nonionic surfactant at 15 ° C or lower.
【請求項2】 非イオン性界面活性剤としてポリオキシ
エチレンアルキルエーテルを用いる請求項1記載のポリ
スチレン系ラテックスの製造方法。
2. The method for producing a polystyrene-based latex according to claim 1, wherein polyoxyethylene alkyl ether is used as the nonionic surfactant.
【請求項3】 スチレンとラジカル共重合が可能な多官
能モノマがアクリル酸エステル又はメタクリル酸エステ
ルである請求項1または2記載のポリスチレン系ラテッ
クスの製造方法。
3. The method according to claim 1, wherein the polyfunctional monomer capable of undergoing radical copolymerization with styrene is an acrylic ester or a methacrylic ester.
【請求項4】 重合開始剤として過硫酸塩をスチレンに
対して1質量%以上10質量%以下配合する請求項1、
2又は3記載のポリスチレン系ラテックスの製造方法。
4. The method according to claim 1, wherein a persulfate is added as a polymerization initiator in an amount of 1% by mass or more and 10% by mass or less based on styrene.
4. The method for producing a polystyrene-based latex according to 2 or 3.
【請求項5】 請求項1、2、3または4記載のポリス
チレン系ラテックスの製造方法により製造された平均粒
子径が0.5μmを超え3μm未満のポリスチレン系ラ
テックス。
5. A polystyrene latex having an average particle size of more than 0.5 μm and less than 3 μm, produced by the method for producing a polystyrene latex according to claim 1, 2, 3, or 4.
JP2000289713A 2000-09-25 2000-09-25 Method for producing polystyrene latex and polystyrene latex Pending JP2002097214A (en)

Priority Applications (1)

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Publication Number Publication Date
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Family

ID=18773059

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Country Link
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009533495A (en) * 2006-04-07 2009-09-17 ビーエーエスエフ ソシエタス・ヨーロピア Electrically neutral dispersion and method for producing the same
US9469786B2 (en) 2012-02-03 2016-10-18 Basf Se Compositions comprising asphalt and electrically neutral copolymer dispersions
KR20170090766A (en) * 2016-01-29 2017-08-08 주식회사 엘지화학 Method for producing graft copolymer and thermoplastic resin composition containing the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009533495A (en) * 2006-04-07 2009-09-17 ビーエーエスエフ ソシエタス・ヨーロピア Electrically neutral dispersion and method for producing the same
US9290651B2 (en) 2006-04-07 2016-03-22 Basf Se Electrically neutral dispersions and method of preparing same
US9469786B2 (en) 2012-02-03 2016-10-18 Basf Se Compositions comprising asphalt and electrically neutral copolymer dispersions
KR20170090766A (en) * 2016-01-29 2017-08-08 주식회사 엘지화학 Method for producing graft copolymer and thermoplastic resin composition containing the same
KR102023985B1 (en) 2016-01-29 2019-09-23 주식회사 엘지화학 Method for producing graft copolymer and thermoplastic resin composition containing the same

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